iron slug grinding

work - definition of work by the free dictionary

This expression was popularized by the fur trappers who roamed the Rockies during the nineteenth century. Like many such terms it has gained much wider currency and seeded offshoots like Eager as a beaver and Busy as a beaver.

Be Careful!You use the progressive -ing form of work to talk about a temporary job, but simple forms to talk about a permanent job. For example, if you say 'I'm working in London', this suggests that the situation is temporary and you may soon move. If you say 'I work in London', this suggests that London is your permanent place of work.

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the 5 fastest rifle cartridges

Rifle cartridges are not the most effective mechanisms for producing high projectile speed. Other things work much better. The 120mm smoothbore main gun on the M-1 Abrams tank fires a depleted-uranium penetrator rod at least 5,700 fps. (Ive also heard 6,300 fps from someone who was in a position to know.). The Navys Rail Gun, which employs electric current rather than gunpowder, gets over 8,000 fps with its projectiles.

With rifles, alas, you run into the limited ability of brass cartridges to withstand pressure, of shooters to withstand recoil and muzzle blast, of bullets to withstand super velocities, and barrels to withstand the heat of hellish powder charges. In 1935, with the introduction of the .220 Swift and its muzzle velocity of 4,110 fps with a 48-grain bullet, we pretty much peaked.

Today, you can get a Swift up to 4,300 fps without blowing it up, and a very few rounds can hit 4,500, but the quest for ultra-velocity in rifles has come to a grinding halt. If we do crack the 5,000-fps barrier, it will probably be done with something other than gunpowder and bullets.

To create this cartridge, Winchester necked down a case of breathtaking obscurity called the 6mm Lee Navy, which had been very briefly adopted by the U.S. Navy and Marine Corps for the straight-pull M 1895 Lee rifle. Neither rifle nor cartridge was a success, and they were dropped in favor of the .30/40 Krag-Jorgensen, which did not last long, either.

The case is a big one for a .22 centerfire, and it is semi-rimmed. The Swift required Winchester to design bullets that would stand up to extreme speed. (Ive seen Swifts liquefy lead cores; the targets were sprayed with it. Ive also seen bullets literally vaporize a few yards from the muzzle.) Because barrel life was so short, Winchester turned to stainless, and discovered that you couldnt blue stainless steel, so the tubes had to be iron-plated and then blued.

Gun writers, not knowing what to make of the Swift, decided that it was creepy, unnatural, and dangerous, and printed nonsense about it by the ream. But the Swift survived because its a hoot to shoot, very accurate, and presents no more problems than any other cartridge. I had a very good one for a long time, and my chosen load fired a 50-grain bullet at 3,900 fps and change. I recall that I could load 40-grainers to 4,300. If youre looking for a light-kicking big-game rifle that kills like electrocution, load a Swift with 60- to 70-grain bullets.

Like the Swift, this is an ancient round that has held up astonishingly well. Designed by Roy Weatherby in 1944 and offered for sale a year later, it was his favorite of his entire line, and when called upon to cite the virtues of hypervelocity, this was the cartridge he cited.

I got my first one (there have been several; I own a very pretty one at the present) in 1965, when I was a woodchuck hunter, and I discovered that the cartridge was to pasture poodles as the A-bomb is to warfare. Weatherby rifles had 24-inch barrels then, and mine gave 3,750 fps with an 87-grain Hornady bullet.

It is, frankly, too much for varmints and is best used on big game at long range, where it has few equals. The best bullets, Ive found, are 115- and 120-grain Nosler Partitions at 3,400 fps. Recoil is surprisingly light, considering how much powder is involved, but the report is severe, and barrel life is pretty short.

So far, Ive listed cartridges that fire light bullets. This one deals in slugs that weigh 180 to 200 grains or more and had an unusual beginning. In 1959, the Army asked Roy Weatherby to build a single rifle/cartridge combination so it could test the effects of hyper-velocity metal fragments (mimicking exploded artillery rounds) on armor. The rifle Weatherby came up with, I recall, was a smoothbore, and for the cartridge, he necked down his terrifying .378 round to .30 caliber. Weatherby got velocities approaching 5,000 fps.

Naturally, word of this beast got out, and the .30/378 enjoyed considerable popularity as a wildcat. In 1996, Weatherby made it a production cartridge, and the last time I checked it was Weatherbys most popular round. Weatherby loads a wide variety of ammo for it, starting with a 165-grain Barnes copper bullet at 3,450 fps and running up to a 220-grain Hornady ELD-X at 3,050.

As the only legitimate use of the .30/378 is on big game at extreme long range, the prudent hunter will go for the heaviest slug possible, as this will retain the most velocity far out on the horizon. Weatherby screws a 26-inch barrel onto its rifles in this caliber, and you cant use less length. You must also use a muzzle brake. I speak from experience. You must have the discipline to reserve the cartridge for ranges of 400 yards or (much) more. Closer than that and the damage is horrendous. You must wear ear protection, even when hunting. Keep in mind that barrel life is short; Ive heard as little as 600 rounds.

Technically, this one doesnt belong on this list because its velocity is only 3,550 fps. However, the Clark was designed in the early 1960s, and it produces those speeds with 80-grain bullets, putting it roughly half a century ahead of ultra-modern long-range loads such as the .224 Valkyrie which shoots 90-grainers at the same speed.

The .224 Clark is the brainchild of a gunsmith named Kenneth Clark of Moderna, California, who figured out half a century ahead of everyone else that its not your initial velocity that counts, but retained speed downrange. (Thus, you now have .223 shooters who are required to use 77-grain bullets for mid-range targets at 600 yards.)

Clark picked the .257 Roberts case, blew it out, gave it a 30-degree shoulder, and designed his own 80- and 82-grain bullets. The best rate of twist was 1-9, which is fast and puts a lot of stress on slugs, so he built them strong and came up with a double jacket for the heavier slug, knowing that people would use it on big game.

The .224 Clark worked just fine. Jim Carmichel had one and liked it a lot. But it never got a lot of publicity, and its a barrel chewer. Nonetheless, it is a truly visionary round, and deserves mention here.

If youre looking for extreme, heres your huckleberry. The .22 EL was the brainchild of gunsmith and wildcatter P.O. Ackley, who built it in the early 1960s with the express purpose of breaking the 5,000 fps mark. It was the apocalyptic .378 Weatherby Magnum necked down to .224 with, as nearly as I can tell, no other changes.

Ackley shipped his .22 EL rifle off to one Bob Hutton who operated Huttons Rifle Ranch in Topanga, California, and did all the rifle testing for Guns & Ammo magazine back in the 60s. (The ranch was situated in a box canyon, which meant Hutton could get away with any amount of noise. Today he would be Taken Away for Questioning.)

Using 50-grain bullets, Hutton reached 4,600 fps and hit a wall. He never got beyond that point. Its possible that with todays ultra-slow powders he might do better. Regardless, you gotta love the name.

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use of steel slag grinding products

The purpose of steel slag grinding products is to recycle the waste after making powder through the steel slag micro-powder vertical mill production line, which can be used to replace clinker for cement production, replace cement for concrete and produce steel slag composite powder.

Steel slag is a by-product produced in the steelmaking process, and its output is 10-20% of crude steel. The amount of steel produced is large, so a large amount of steel slag is produced every year, but its utilization rate is even less than half of the ratio. A large amount of steel slag is discarded after iron selection, which in turn occupies a lot of land and wastes resources. Accompanied by the increase in iron ore prices, the growth rate of steel demand has slowed down, and steel companies have large output but low efficiency. Therefore, realizing the comprehensive utilization of the secondary resources of steel plants is the fundamental way to improve the efficiency of steel enterprises.

Steel slag as a cement mixture has been listed in the national standard. After grinding, steel slag powder can be used as an excellent cement mixture, partially replacing clinker to reduce cement production costs, and steel slag cement has a late stage compared with Portland cement. High strength, good abrasion resistance, low heat of hydration, and good impermeability.

Steel slag powder can replace cement in equal amounts, can improve the later strength of concrete, and can prepare C30-C80 concrete. Compared with the concrete without admixtures, when the water-cement ratio is the same, the slump of the mixture increases by more than 10 cm, the fluidity, anti-segregation, and gap passage are good, and the concrete's compactness and anti-permeability ability It is improved, the heat of hydration is reduced, and the frost resistance is improved.

Steel slag has high hardness, contains iron elements, and has poor grindability. The key technical equipment to realize the production of steel slag powder is grinding equipment. As a professional comprehensive service provider of industrial waste slag grinding, Xinxiang Great Wall uses vertical mills as the main grinding equipment for the raw material characteristics of steel slag for comprehensive utilization of steel slag.

SBM LM vertical mill adopts new steel slag grinding vertical mill technology. There are many models of HLM steel slag powder vertical mill. The specific surface area of the produced steel slag powder is 420m2/kg. The output of single machine is from 15 tons to 220 tons. It is flexible in configuration and adopts cloud control. The system is equipped with one-room control, the whole line view and switch machine functions, saving labor costs and reducing power consumption. The use of steel slag grinding products can be used as much as possible.

m18 and m18 fuel - performance driven technology | milwaukee tool

The M18 FUEL SUPER HAWG Right Angle Drill is engineered from the ground-up to deliver you the power and speed needed to replace corded right angle drills, providing the capability for fully cordless rough-ins on a single charge so you no longer have to worry about running extension cords or lack of mobility. The drills unique QUIK-LOK chuck design improves your productivity by providing easy, one-handed bit insertion and removal, while the all-metal side handle and LED light ensures you have optimal control and visibility while operating your tool.

Each product within the Milwaukee Knockout System was built upon the principles of reducing the tedious steps of hole making, improving the speed of the process, and limiting the fatigue of the user. The M18 FORCELOGIC 6 Ton Knockout Tool punches up to 4" holes in 14 gauge mild steel, making it ideal for service applications, while the M18 FORCELOGIC 10 Ton Knockout Tool punches up to 4" holes in 12 gauge stainless steel, making it ideal for new commercial and industrial construction. The Quick Connect Alignment System delivers easy set-up without the tool, and speeds up repetitive punching. Lastly, the EXACT dies have both engraved crosshairs for accurate alignment, and slug removal ports for optimal slug removal.

The M18 FORCELOGIC 3 Underground Cable Cutter with Wireless Remote is the Smartest Way to Cut. We removed the physical connection to the tool allowing you to cut up to 1500MCM Copper 15kV wirelessly. After set-up, you can move away from the cutting area and utilize the wireless remote which will indicate with a green LED when the tool is done cutting, providing a safer cutting experience. Furthermore, the new-to-world tool design provides a more controlled way to cut when cutting locally. The balanced design, handle and hang hook enable easiest set-up in vaults, while the open jaw design provides easiest access to trenches.

The M18 FORCELOGIC Long Throw Press Tool is the smallest, most intelligent extended length press tool on the market. Paired with our 2 -4" IPS XL Rings, this tool is more efficient alternative to welding, enabling you to press connections on 2 -4 from schedule 10 up to schedule 40 black iron pipe. This tool and ring kit combination has the lightest in-line design giving you unrivaled access in tight spaces and around installed pipes, providing you with controlled, flameless steel connections for unmatched productivity.

The M18 FUEL 8-1/4 Table Saw generates the power of a 15A Corded Saw, 24-1/2 of Rip Capacity and Up to 600 Linear Feet of cutting per charge, providing you a cordless replacement so you no longer have to worry about running extension cords or lack of mobility. The compact, lightweight design makes it easy to maneuver around the jobsite, and the on-board storage and tool-free guard and riving knife changes keep you productive. Also equipped with ONE-KEY, you can now protect your investment with features like tool tracking and tool lock-out so you know where your saw is and who is using it at all times.

The M18 FUEL Ext. Anvil Controlled Torque Impact Wrench w/ ONE-KEY delivers Controlled Torque for fastening and up to 1,100 ft-lbs of Nut-Busting Torque. Professional tire technicians can perform Faster Tire Service without the hassle of pneumatic hoses, compressors, and torque sticks. The cordless impact wrench features four customizable modes, delivering you with unique fastening torque outputs needed to perform tire service on vehicles such as sedans, light trucks, and box trucks. Also equipped with ONE-KEY, you can now customize the settings on your tool specific to your needs, while protecting your investment with features like tool tracking so you know where your tool is at all times.

We are committed to protecting our users's investments by providing high performing, trade-focused solutions that are fully compatible with M18 REDLITHIUM batteries. The M18 system has over 200 performance-driven solutions, and growing!

metal slug attack tips, cheats & strategies: 5 hints you need to know - level winner

Metal Slug Attack is a Metal Slug Series 20th Anniversary Official Title for Android and iOS, courtesy of SNK Playmore for mobile devices. This is the follow-up to Metal Slug Defense, which comes with numerous improvements such as a simplified control system, a wide range of missions to take on, and much more. This is a tower defense game where you can collect items across different missions, customize, equip, and upgrade your units, and take part in battles against players from all over the world. You can also take part in co-op missions in the Guild Raid and Special Ops game modes.

As you continue playing this tower defense / action title, youll be able to thoroughly upgrade your units and defeat in-game enemies from several parts of the world, including the Middle East and Vietnam. But before you go on to more challenging things, youll need to start out with the basics, and thats what we shall be talking about in this list of Metal Slug Attack tips and tricks for beginners.

When fighting battles in Metal Slug Attack, you should always have double speed turned on, so as to make the game go faster. Auto battle, on the other hand, is good mostly when youre grinding, or repeating a battle youve already completed. You can also use it in easier battles youre confident of winning, but you definitely do not want auto battle on when youre in a tougher battle. Remember, the games AI is not as sophisticated as human-controlled strategy.

Any time you dont know what to do next in the game, you may want to head to the quest and daily screens. Daily events are limited-time missions that could earn you some big rewards right then and there, while the actual quests are longer, more drawn-out missions that take a while to complete, but eventually earn you a whole lot of coins, XP, and treasure once youve finally completed them.

This generally applies to the easier battles, but you should generally save your stamina by using the lowest possible defense for that situation. This may not sound too prudent, considering the importance of defense in a tower defense-based game, but the idea here is not overexerting on defense. Keep on doing this until youre able to unleash heavier attacks and take out your enemies quicker.

Whenever youre asked if you want to draw a new character piece or item, then go ahead and do it. Usually, its going to be one of those items mentioned, though at times, you may get a new character in full. Add these new characters to your team for the simple reason that your stamina improvements will outweigh character cool-down times once your support has been upgraded sufficiently.

If your characters dont have what it takes to win the next battle, you can power up your characters in the Build Up screen. That screen allows you to equip your characters with skills, and pay MSP for higher experience levels. Both substantially increase your characters stats, with higher increases coming with higher levels.

slag grinding with the polysius roller mill in china - article on the slag industry from global slag

Figure 1: Particle size distribution of GGBS samples produced by VRM and BM.Figure 2, above: Development of slag grinding plants equipped with VRMs in China (1997-2007).Figure 3: Development of GGBS production by VRM plants in China (1997-2007).Figure 4: Slag grinding plants set up by the top 62 steel and iron manufactures in China.Figure 5: Effect of GGBS on chloride ion penetration of concrete (C35, W/B=0.43, ASTM C1202, water-cured at 27C).Figure 6: Effect of GGBS on temperature rise in concrete under adiabatic conditions (prediction using SSY concrete - a simulation software developed by EnGro Central Laboratory7).

Granulated blast furnace slag has been used as an component of blast furnace cement for many years. The replacement of a certain clinker portion by blast furnace slag saves raw materials and thermal energy for pyroprocessing. Ingo Engeln from Polysius AG gives an overview of the Asian slag market and the use of Polysius' vertical roller mills in China and South Korea.

The replacement of a certain clinker portion by blast furnace slag does not only mean to save raw materials and thermal energy for pyroprocessing, but also provides for advantageous characteristics of the blast furnace cements:

For a long time, the applicable standards allowed cement clinker and granulated blast furnace slag to be ground together in tube mills, but especially by utilisation of tube mills the clinker mainly accumulates in the fines fraction, while the granulated slag accumulates in the coarse range (Figure 1).

Because the proportion of pulverised blast furnace slag predominates in the blast furnace cement, the slag can only inadequately participate in the hydration as a result. The consequence is loss of quality. Intergrinding in roller mills provides very similar particle size distributions for clinker and slag and thus provides a better quality of the blast furnace cement.3

The results based on studies by Schwiete and Dlbor in 1963 already show the positive influence on the strength development of cements when grinding granulated blast furnace slags to high finenesses (Figure 2).4

Therefore, it is an indisputable fact that it is necessary to grind the granulated blast furnace slags to high finenesses in order to generate good strength properties. The intergrinding of clinker and granulated blast furnace slag inevitably necessitates the energetically unfavourable grinding of the clinker to higher finenesses as necessary. The only way to avoid this is to grind clinker and slag separately.

For the design of a slag grinding plant the special properties of granulated blast furnace slag have to be considered. Granulated blast furnace slag is moist, abrasive, fine grained and difficult to grind. It also needs to be ground very finely. There are several grinding systems on the market meeting the requirements for slag grinding, but no other grinding system has gained so much importance during the last decade as the vertical roller mill.

Fig. 3 shows the Polysius roller mill. The essential components of the Polysius roller mill are the grinding table, the two pairs of rollers, which can move vertically as well as rotationally around the guide axles, the housing, the adjustable nozzle ring, the drive unit with motor, and the separator.

The double-grooved grinding track uses a defined gap between the rollers and the grinding track to prevent the material from flowing out at the sides. This reduces the specific power consumption. The grinding rollers can move in the vertical direction and follow the wear profile, ensuring an even wear profile and a constant material bed thickness. Each grinding roller can also be twisted through 180, i.e. the inner roller can become the outer roller, so the wear profile, and hence the throughput, remain virtually constant over the entire running period. This minimises internal recirculation in the mill and stabilises the material bed. It reduces the gas velocities in the nozzle ring and thus saves energy. It is best if used in conjunction with the external material circuit.

The Polysius roller grinding mill has used a bucket elevator from the outset for returning the recirculation material. This reduces the amount of air-borne recirculation within the mill, which lowers the pressure loss and improves the smooth running of the mill. The bucket elevator is also a great help dur-ing maintenance work.

The flowsheet in Figure 4 shows the typical arrangement of a Polysius slag grinding plant with a roller mill. Fresh slag and sometimes gypsum are transported from the storage to the mill feed hoppers by conveyor belts. After being discharged from the hoppers, the mill feed material is proportioned by weighbelts and then carried by conveyor belts to the mill. Protection against tramp metal is provided here by a suspended magnetic separator. A metal detector is installed in the conveying route to take away metallic objects. A heated coarse feed valve is used as an airlock device in the material feed equipment. The feed chute is very steeply inclined and is in principle integrated into the tailings cone of the high-efficiency separator. The external material circuit is a closed system, consisting of a bucket elevator, vibrating through, magnetic drum and feed chute to the tailings cone. In order to prevent material from caking onto the recirculation bucket elevator, adequate hot air is supplied by a specially installed fan. This also heats the vibrating trough and the magnetic drum. Dust removal is ensured via the mill. The hot air used for drying is generated by a hot gas generator. The finished material is transported by the circulating mill air directly to a bag filter, where it is collected and then conveyed to the pulverised slag silo. A portion of the circulating mill air is returned to the mill, which helps to save thermal energy.

Another point to consider is that the exit gas from the grinding plant has a high water vapour content. Its temperature must therefore be prevented from dropping below the dew point and plant components such as circulating bucket elevators, chutes and pneumatic trough conveyors must be carefully insulated or even heated to prevent clogging.

The first roller mill for this application was put into operation in Korea in 1995. Polysius designed and supplied a type RMS-51/26 roller mill with an integrated high-efficiency SEPOL RMS-435 separator.

The output of the mill was 76t/h at a fineness of 4840cm2/g according to Blaine. The residue on the 44mm screen was below 2%. The specific power consumption for the mill was 33.2kWh/t, for the mill fan 8.7kWh/t and that for the separator was 1.4kWh/t, measured at the counters of their drive motors. Also remarkable is the low pressure drop of only 34mbar in the mill.

During the next years further slag roller mills of various sizes followed in France, Spain and the US. But nowhere in the world have so many roller mills for granulated blast furnace slag grinding been sold as in China dur-ing the last 6 years.

The first Polysius roller mill for slag grinding in China is in operation since 2002 in Anshan in the province of Liaoning. The grinding plant of the Angang Group Slag Development Company is exactly the same size as the one which has been in operation since 1995 just a few hundred kilometres away in Korea.

The grinding plant for Anshan was designed for a grinding capacity of 90tph at a ground blast furnace slag product fineness of 4000cm2/g according to Blaine. However, following the market trend, the plant now produces 83tph of ground blast furnace slag with a fineness of 4300cm2/g (acc. to Blaine). The specific power requirement for roller mill, separator, recirculating bucket elevator and system fan is 38.4kWh/t measured at the counters of the mo-ors and referred to the product fineness of 4300cm2/g (acc. to Blaine).

The hot gas needed to dry the granulated blast furnace slag, which usually has a moisture content of 8-12%, is delivered by a hot gas generator. The residual moisture content of the ground blast furnace slag is less than 0.3%.

The grinding plant, which is carefully maintained by the owner, provided high availability and troublefree operation. None of the wear protection plates in the mill housing and in the grit cone of the separator have yet needed replacing. Only the ceramic castable in the upper housing section of the separator was replaced by wear-resistant steel plates soon after the commissioning. Once a year, after approx. 3500 operating hours and production of 300,000t of ground blast furnace slag, the surfaces of the grinding elements are refurbished by build-up welding during a planned maintenance stoppage. The specific wear of grinding track and roller tyres, taken together, is 7.3g/t.

For long service life of the grinding tools not only the appropriate wear lining is important. The iron extraction system in the external material circuit is an extremely important feature of the Polysius roller mill for slag grinding.

It is a well-known fact that iron particles in the granulated blast furnace slag are the main cause of wear in the mill. Therefore it is extremely important to remove the maximum possible amount of this iron. The external material circuit is very well suited for this purpose, because it handles a large quantity of material, some of which is already partly ground.

The material discharged by the bucket elevator is fed to a vibrating trough, to ensure a uniform feed rate to a magnetic drum separator. The aeration of this magnetic drum separator is so designed that practically pure iron with no granulated slag is removed from the stream of material. After the magnetic drum, the recirculated material finally returns to the grinding table. The picture in Figure 6 shows typical iron contents found in a slag grinding plant with vertical roller mill. The incoming granulated blast furnace slag has an iron content of 0.28%, corresponding to an iron quantity of 210kg/h.

The recirculating material in the bucket elevator has an iron content of 0.7%. The magnetic drum separator removes around 170kg of iron per hour in permanent operation. The iron contents found in the roller mill and in the finish product impressively illustrate the efficiency of the external material circuit for concentrating the iron and facilitating its removal. Such efficient extraction of iron in the grinding process has a very positive effect on wear in the mill.

Special gauges for rollers and grinding table enable the operator of the grinding plant to measure the wear on the grinding tools at regular intervalls (Fig. 7).Transferred to a wear sheet (Fig. 8) the measured values provide an accurate picture of the wear profiles for rollers and grinding track. In black colour the worn of material is indicated. This wear sheet shows typical wear profiles for slag grinding and it can be clearly seen that the wear on the inner rollers is lower than on the outer rollers. In this case the roller units can be turned by means of the roller pair dismantling device. The former inner roller now becomes the outer roller. Thus all four rollers get equal wear profiles and maximum utilisation of the roller liners is achieved. For once rewelded, hardfaced liners the turning of the roller units usually happens after 3000-4000 operating hours. A further important aspect when using a roller mill are the conditions and possible ways of carrying out maintenance work. Simple access and rapid exchangeability of the grinding elements are the prime requirements here.

Polysius roller mills therefore offer the option of replacing complete roller pair units. Special installation equipment, which facilitates rapid replacement through the large maintenance doors in the housing, is provided for this purpose.

In China most customers decide for refurbishment of the grinding tool liners by build-up weldings, a work which is usually carried out by local compa-nies. The photo in Figure 9 shows the arrangement for build-up welding of the grinding track in a Polysius slag roller mill in China.

The welding material used is usually much harder than the material of the original liners and thus provides the advantage of longer service lives. Reportedly the intervalls between the reweldings of the grinding tool liners can be 6000-7000 operating hours.

During the last few years the design of the Polysius roller mill has even been improved (Fig. 10). On the existing mill of the size RMS 60/29 in Camden, New Jersey, several modifications have been carried out to improve the performance. The mill housing now is smaller and has a round cross section to avoid dead zones, the separator housing is smaller, the recirculating material is passed into the grit cone and the wear protection for guide pins and brackets has been improved.

After optimisation the capacity jumped from 86.3t/h to 99.0t/h based on the same compressive strength values to achieve the grade 120 quality of the finish product. The desired product quality was now achieved with 5700cm2/g according to Blaine and thus approx. 300cm2/g less than before. The modifications also led to a smoother mill operation and to reduced fuel consumption.

The optimised mill housing design leads to continously increasing gas velocity over the height of the roller mill, the conveying capacity of the gas stream is increased and in consequence undesired internal circulations which cost energy are avoided. Thus it is ensured that particles of finish product fineness are exposed to the separator and can leave the grinding circuit as early as possible. This again leads to coarser material on the grinding table, more stable mill operation and better grinding efficiency.

The first 2 Polysius roller mills for slag grinding with optimised housing in China belong to ACC Ya-Dong Cement Corporation. The slag grinding plant in Nanchang is in operation since November 2005. The roller mill is a type RMS-51/26 with an SEPOL RMS-435 separator.

For a feed material consisting of 95% slag, 4% gypsum and 1% limestone a capacity of 80t/h finish product with a fineness of 4400cm2/g according to Blaine was warranted. The residue on the 45mm screen must not exceed 5%. The specific power consumption warranty for mill, separator and fan was 35.5kWh/t, measured at the counters of the drive motors.

During commissioning in November 2005 for a mixture of 97% slag and 3% gypsum a capacity of 94t/h at a fineness of 4580cm2/g according to Blaine was achieved. The residue on the 45mm screen was 2.4%. The specific power consumption for mill, separator and fan was 35.48 kWh/t referring to the fineness of 4580cm2/g according to Blaine, measured at the counters of the drive motors. For the mill drive only a bonus compared to a tube mill of 2.95 was determined. This means that a tube mill would require almost 3 times as much energy for the mill drive as the Polysius roller mill.

In the last few years further slag meal producers decided for the Polysius roller mill and made it one of the most popular slag grinding mills in the world and especially in China. Eight Polysius roller mills for granulated blast furnace slag are meanwhile in operation in China and 5 further units have been sold in recent months.

In China and South Korea, many granulated blast furnace slag grinding plants are already in operation, but the number of granulated blast furnace slag grinding plants in South-East Asia is still low. Customers from South-East Asia who are now interested in slag grinding are invited to send their inquiries to the Polysius subsidiary in Singapore

4. Schwiete, H.-E., Dlbor, E.: "Einfluss der Abkhlungsbedingungen und der chemischen Zusammensetzung auf die hydraulischen Eigenschaften von Hmatitschlacken" Westdeutscher Verlag, Kln und Opladen 1963.

die science: slug pullingcauses and solutions

When a pierce punch creates a hole, it also produces scrap, called the slug. When the slug sticks to the face of the punch during withdrawal or comes out of the button or lower matrix, it is called slug pulling.

Slug pulling can be a serious problem in a stamping operation. If a slug falls off the punch and onto the strip or part, it can damage parts and the die. Keeping the slug down in the matrix or, better yet, pushing it out of the die completely is the desired scenario.

Numerous factors contribute to slug pulling: trapped air, large cutting clearances, extremely fast piercing, sticky lubricants, improperly demagnetized punches, and fatigued or insufficient spring ejectors.

Keep in mind that the metal you are cutting behaves like an elastomer. During the piercing process, a tight seal is created around the punch perimeter. During withdrawal, this seal prevents the slug from coming off the punch. The use of heavy lubricants only increases the sealing action.

The only portion of the piercing punch that makes contact with the metal is a localized zone around the outside diameter. Even punches with angularity or shear angles ground on them make only localized contact with the metal (see Figure 1b). To reduce the amount of vacuum being created, make a small air vent in the center of the pierce punch, through which the otherwise trapped air can escape. Reducing the suction this way will break the seal between the slug and the punch and allow the slug to fall off the pierce punch. This might not solve all your slug pulling issues, but it certainly will help.

If your pierce punches are too small to vent, you will need to address slug pulling with other methods. Using a vacuum unit under the button is a common solution to pull the slugs off the face of the piercing punches. Equipment made expressly for this purpose is available, but a good wet/dry vacuum also will work.

When smaller cutting clearances are used in the perforating process, both the slug and metal outside the slug are forced into compression. After the slug is cut free, it decompresses and remains in the matrix because the slug now has an interference or press fit into the matrix.

With larger cutting clearances, the slug is slightly smaller than the hole in the matrix, and the slug may be pulled freely from the matrix with the punch. Reducing the cutting clearance can help solve this problem, but it also will reduce the life of the punch and increase the necessary sharpening frequency. So rather than reducing the cutting clearance, try pushing the slugs off the punch or holding them tight in the button or matrix using a spring-loaded ejector (see Figure 2).

If the punch is too small to use a spring ejector, try using a slug-retention button that holds the slug in the matrix using compression. This button comprises two small slots machined at an angle in each side of the matrix. These slots generate a burr on the slug, and the burr is forced downward at an angle and wedged into the matrix. Another style has barbs in the matrix that impale themselves into the slug to keep it in place.

A reverse-taper bell-mouth button is another option. Most die buttons have a bell-mouth taper machined into them, with the hole diameter increasing toward the bottom of the button. In the reverse-taper button, the hole in the matrix gets slightly smaller as it nears the clearance opening. This holds the slugs in compression in the matrix. Keep in mind that for most piercing operations, 0.0005 to 0.001 inch is more than enough taper; if the taper is too great, compression can cause the matrix to split.

Magnetism Problems. When punches and die sections are sharpened, they often are placed and ground using a surface grinder. Most surface grinders hold the sections and punches by securing them to a high-power magnet. Any ferrous metal that comes in contact with this magnet becomes slightly magnetized.

Magnetized pierce punches and die sections can cause slug pulling and can attract other magnetic debris, carrying it through the tool. So be sure to demagnetize all die components after grinding. Commercial units are available for this task.

dragon quest 11 - level up fast and farm metal slimes

The best way to level up fast in Dragon Quest 11 is to farm metal slimes. There are a bunch of different types and they show up randomly in battle, but there are places you can go to increase your chances of finding them.

Metal slimes of all types can be found anywhere, but head to these places to increase your chances. This also isnt a full list of metal slime types, but these are your best places for each point in the game.

Not only do metal slimes turn up and random, the little buggers have a tendency to run away. You cant stop them from running away and sometimes you get unlucky and they leg it before you even get a chance to react, but there are some things you can do to increase your chances.

For starters, you should change your lineup at the start of a battle to include Erik, Hendrick, and Jade. Erik and Jade are fast and both generally get their turns faster than most enemies. On top of that, theyre both able to unlock skills that give them a fighting chance against metal slimes.

You see, not only do they like to run from fights, they have high defence. Often, your attacks will do 1-damage or miss completely. With Eriks high cost Critical Claim ability in the Guile section of his character builder youre guaranteed to kill any metal slime type in one hit. Erik is your best person for this, so keep his MP topped up and save it for metal slimes when youre farming.

Jade also has a couple of abilities that are good for metal slimes. Lightning Thrust is another critical strike that can take out a metal slime in a single blow, but theres a chance she will miss. Multi Thrust is another good skill for farming slimes in Act 1, as this can take out low-level slimes easily. Both skills are behind the Spears section of her character builder.

Another handy skill for low-level Metal Slimes is Metal Slash. Erik, Sylvando, and Hendrik can learn this in the Swords section of their character builders. For early on, any skill that allows you to hit the enemy multiple times also works, as well as dual wielding or using claws.

As pointed out by commenter Drew, you can also use Rabs pep power Dirge of Dundrasil to put metal slimes to sleep. It guarantees you at least a free move against even metal monsters. Getting Jade to maximum Charm can also increase your odds of a swift victory.

There is also a way to make metal slimes appear and, if done correctly, can level your characters up two or three times in a single fight, even towards the end of the game. Theres a Pep ability called Electro Light that summons in metal slime types, replacing enemies on the battlefield. Unfortunately, you need the Hero, Jade, and Sylvando all pepped up at the same time.

The easiest way to do this is to play with all three. Whenever one gets pepped up, put them on standby and they will remain pepped. Do this until all three are pepped up and youre good to go. Now you just need to use the tricks in the previous section to kill them all before they escape.