mineral low gold ore gravity separator

static grizzly screen as a rock separator

The screening a Static Grizzly separator does is sort and classify the rock according to size. The first stage is SCALPING. This is the practice of removing any material that may slow production. It may be rock that is too big for the equipment to effectively handle, or fine material that is taking up valuable space and will consume precious energy if there is further handling. The name of the equipment that performs this function is called a GRIZZLY. The equipment is limited to a maximum size of rock that it can accept. The grizzly is a pattern of heavy steel bars that are laid down in a grid pattern. This grid will allow the small rocks to go through. The larger rock being bigger than the grid opening wont. This rock then can be either sent for further size reduction, or removed.

The purpose of this is to keep the grizzlies down time to a minimum by preventing the oversized rock from piling up while on its surface. The effectiveness of the sizing will be lowered due to rock that could go through sliding off. But as a counter balance the overall through put will be better due to the greater availability of the grid. If the Grizzlies performance rate is to low, then causing the grizzly to vibrate will increase the effectiveness of the sizing.

The Ross Chain Feeder illustrated in Fig. 3 is shown discharging the ore over a bar screen, or grizzly. It is advisable to provide a screen of this sort ahead of the primary breaker in order to bypass material that is already small enough to pass straight through the machine. The commonest device is a stationary grizzly from 6 to 12 ft. long, slightly wider than the stream of ore, and set at a slope of from 45 to 60 to the horizontal. The bars, which should be of mild steel, are preferably wedge-shaped with the wider part uppermost. They are held together by long bolts at right-angles to their length and are kept at the desired distance apart by spacing washers, which often consist of old piping cut to the required length. The clearance betweenthe bars at the upper end should be the same as the discharge opening of the crusher which the grizzly serves, but at the lower end it should be slightly greater to prevent choking.

A grizzly of this type, though cheap and simple, tends to get clogged with ore. In conjunction with a Ross Chain Feeder, however, clogging is eliminated and the length of the bars can be reduced by 50% or more.

Bars are a widely used means of reducing the work of primary or secondary crushers. As the ore is fed to the crusher, it passes over the grizzly bars, and the finer pieces drop through into the mill ore bin. The grizzly is made of wear resisting wedge shaped bars easily replaced if necessary.

Grizzly Bars are punched and held in place by steel rods passing through the holes. Cast iron spacers, of the proper shape and width, are placed between the bars. Various types of bars and spacers can be supplied, depending upon the application.

A vibrating grizzly screen has been developed as a distinct improvement over the fixed grizzly now in such wide use.It combines the functions of screening and feeding the ore to the primary crusher, and, by eliminating the undersize product in the ore feed to the crusher, materially increases the crusher capacity. In addition, due to the pulsating action of the unit, the ore is fed positively to the crusher, at a controlled rate and the manual labor usually required is eliminated.

The unit consists of a strong, frame mounted, standard grizzly which receives a positive eccentric motion in a lateral plane through connecting links attached to the head motion of the jaw crusher. Due to this positive action the angle of slope of the grizzly may be much less than that required in fixed type grizzlies; and head room or fall may be reduced.The Shaking Grizzly is constructed in several sizes to fit standard Jaw Crushers.

Aggregate production plants use screens to direct, separate, and control material flow in the process. The two main purposes for screening the aggregates are to remove oversize material from the crusher product or undersizematerial from the crushing plant and to completely size the materials produced. An aggregate production plant must perform both functions.

The feed may contain some material that does not have to be crushed and which should be removed from the input to the primary crusher. A scalping unit is frequently used between the feeder and the primary crusher to remove from the feed material that is smaller than the setting of the crusher. It may be a grid, grate, or screen, and it may be stationary or it may vbrate. Raw material removed from the feed is sent to finish screens and reduction crushers.

knelson concentrator gravity separation of polymetallic ore - jxsc

The major methods of recovering gold are gravity separation, gold flotation, cyanide. In fact, traditional gravity separators, such as jig machine, spiral chute, gold shaker table, have the shortages of low beneficiation ratio and low productivity. In addition, the flotation process is difficult to work on the coarse grain gold minerals which with heavy density. Considering environmental protection, the application of gold cyanide method is also greatly limited. Compared with the commonly used gold recovery methods, Knelson concentrator is an efficient centrifugal mineral processing equipment, has great advantages of capable to recovering coarse, medium, fine grain gold, high beneficiation ratio and no pollution.

Mine is a typical porphyry type gold-copper deposit, with low-grade gold-bearing refractory ore. as shown in the processing result, the efficiency of recovering associated gold is very poor. In this experiment, we carry out the gravity separation experimental of the knelson concentrator, trying to provide the technical basis for improving the recovery efficiency of associated gold ore.

Copper and iron are the two main elements in the raw ore, and exist in the forms of alpha chalcocite, covelline, enargite, iron pyrite. The gangue minerals are mainly quartz, dickite, alunite and a small amount of iron oxide, etc. Gold symbiosis with other minerals closely, that is the raw ore is multi-metal gold-bearing refractory ore.

Based on the analysis of the occurrence state and distribution of gold in the overflow ore, it is found that a large part of the gold is dissociated from the raw ore, the visible gold in the overflow ore accounts for 36%. It can be seen from the distribution of gold in the ore that improving the recovery of visible gold is the key to increase the recovery rate.

Taking enrichment and gold mineral scanning processes for the part of overflow ore, obtain 80 gold minerals. According to the count of grain ore size, the visible gold is mainly fine-grained grade, in which, 10 ~ 80 m account for 80%, few are less than 10m. In view of the previous research, gold particles over 37 m can be recovered by gravity separation, while 10 ~ 37 m is more suitable for flotation processing. click to find more info about Fine gold recovery equipment.

The ore sample is a low-grade gold bearing refractory copper ore, in which, gold is closely associated with copper-sulfur minerals, the gold( mainly in nature gold) are distributed in the gaps. After the ore was dissociated, a large part of gold became granular gold, and it was difficult to achieve effective recovery by flotation, so the Knelson is used to pre-recover the granular gold.

The Knelson centrifugal concentrator is often arranged at the outlet of the ball mill, we analysis the ball mill discharge firstly, to know the metal distribution of different particle sizes. As can be seen in the above table, the major particle size is 0.045mm-0.6mm, with 75.26% of productivity, and the distribution rate of gold is up to 83.76%. The recovery result of this grain size will directly affect the recovery effect of the final gold metal.

Machine: KC-MD3 Knelson concentrator and shaker table for gold recovery Experimental variable: gravity, fluidized water, fluidized water, feeding rate. Sample ore size: -1mm Content of gold: 0.55 g/t 2.2.1 Gravity Experiment condition: pulp density 30%, feeding rate 1 kg/min, fluidized water 3.0-3.3 L/min, enrichment time 25min, gravity range 40-120G. From the experimental results, with the increase of gravity value, the concentrate gold grade and recovery rate of Knelson gravity decreased. The lower gravity value is beneficial to Knelson to concentrate gold. When the gravity value is 40G, the grade of gold concentrate is 107.28 g/t, and the recovery rate is 67.49%. 2.2.2 Fluidized water Experiment condition: pulp density 30%, feeding rate 1 kg/min, gravity value 40G, enrichment time 25min, fluidized water have 2L/min, 3L/min, 4L/min, 5L/min. The result shows that with the increase of fluidization water flow, the grade of gold concentrate tends to rise, the recovery rate is changed slightly. When the water flow is 5.0 L/min, the concentrate is 100.56 g / t, and the recovery rate is 64.35%.

2.2.3 Enrichment time Experimental conditions: pulp density 30%, ore feeding speed 1 kg/min, gravity value is 40G, fluidization water 5.0 L/ min, enrichment time have 20 minutes, 25 minutes,30 minutes and 35 minutes. With the increase of enrichment time, the grade of concentrate increases gradually, and the recovery rate increases at first and then decreases. When the enrichment time is 30 min, the maximum value is 68.23%, and the concentration level is 114.63%.

2.2.4 Feeding speed Experimental conditions: pulp density 30%, gravity value is 40G, fluidization water 5.0 L/ min, enrichment time 30min. As the feeding rate is increased, the grade of concentrate has a tendency to rise, and the beneficiation effect is gradually enhanced, the recovery rate is increasing at first and then decreased. when the feeding rate at 1 kg/min, the recovery rate up to the max value of 70.70%, the grade is 137.12g/t. Considering the stability of Knelson concentrator, the most suited feeding speed is 1 kg/min.

2.2.5 Enlarged experimental of combined variables On the basis of the preliminary experiments, researcher adopt KC-MD 7.5 Knelson concentrator to carry on combined variables experimental of discharged ore of ball mill. Experimental condition: process ore 600 kg, particle size -2mm, pulp density 30%, feeding rate 300-400kg/h, gravity value 40G, fluidization water pressure 0.2-0.3 Mpa.

Knelson gravity concentrator has a good effect on gold enrichment, and obtain a high grade of concentrate. The gold content of the concentrate is 251.30 g/t, the recovery rate is 53.70%, and the Knelson has not affected the recovery of copper.

2.3.2 Granular gold recovery The grain size range of gold minerals is 0 ~ 800 m, and the particle size distribution of gold particles is mainly concentrated in the range of 20 ~ 100 m( 69%). The gold particles less than 30 m account for only about 8%, the recovery rate of that is low. The gold particles larger than 150 m in the concentrate account for 13%, of which only about 1% are more than 360 m. This part of the particulate gold is difficult to be recovered by flotation. Recovering the great mass of gold by Knelson gravity separation can effectively reduce the sedimentary gold in the flotation machine, and avoid the repeated grinding.

Using Nielsen concentrator which obtains synthetic recovery of -0.6+0.038 mm gold. Nielsen concentrator, the pre-recovery of most of the particles of gold, can reduce the loss of gold in flotation operations, achieving the goal of the income received early.

About JXSC JXSC starts the mining equipment manufacturing since 1985 have great advantages in mining equipment among various minerals and professional solutions for mineral processing plant, is a reliable provider of gold separator machine and gold recovery equipment. Follow us to receive updates of the gold extraction process.

Mining Equipment Manufacturers, Our Main Products: Gold Trommel, Gold Wash Plant, Dense Media Separation System, CIP, CIL, Ball Mill, Trommel Scrubber, Shaker Table, Jig Concentrator, Spiral Separator, Slurry Pump, Trommel Screen.

low grade gold ore - gravity separation & concentration methods - metallurgist & mineral processing engineer

Hello i am from Indonesia, We currently had a bulk of about 500,000m/t oxide ore grade from 0.4-0.7grams per ton, there is no visible gold. At first we plan to do dump leaching but the test show only 35 percent recovery and after crushing to minus 1 inches recovery shows 75% after 6 weeks and we also did a vat leaching test it show 88% recovery after 3 days at the size of minus 1 mm. The head assay was 0.55g/mt Au and Ag 55ppm. I would i to know if there is a way to concentrate this type of low grade ore or it is economics to do so and if falcon or knelson will do the job?

Pre-concentration of low grade gold ores has been successfully carried out utilizing DMS but of course it is ore type specific. This requires fractional densimetric test work to be carried to determine the optimal liberation (crushed ore size) required to obtain the mineral split.

Additionally test work is being carried out using XRT, not looking at gold itself which is in too low a concentration for detection, but looking at gold associated minerals. Speak to the major XRT suppliers such as Tomra and Steinert.

As the previous post indicated there are ways to concentrate the gold but it will depend on the mineral association. Ores can be sorted or concentrated exploiting any number of characteristics; color, SG, minerals (sulfides), radioactivity, magnetism, etc.... It all depends on the mineralogy.

If this deposit only consists of 500,000 tonnes (I think that is what m/t means) it may not warrant a large capital expenditure due to the relatively small tonnage. Ideally you need to conduct a preliminary economic analysis where engineers review the deposit, test work and develop some options for treatment based on the economics. These types of investigations cost in the range of $40-$100k excluding test work (if necessary). If you need assistance please let me know.

DISCLAIMER: Material presented on the 911METALLURGIST.COM FORUMS is intended for information purposes only and does not constitute advice. The 911METALLURGIST.COM and 911METALLURGY CORP tries to provide content that is true and accurate as of the date of writing; however, we give no assurance or warranty regarding the accuracy, timeliness, or applicability of any of the contents. Visitors to the 911METALLURGIST.COM website should not act upon the websites content or information without first seeking appropriate professional advice. 911METALLURGY CORP accepts no responsibility for and excludes all liability in connection with browsing this website, use of information or downloading any materials from it, including but not limited to any liability for errors, inaccuracies, omissions, or misleading statements. The information at this website might include opinions or views which, unless expressly stated otherwise, are not necessarily those of the 911METALLURGIST.COM or 911METALLURGY CORP or any associated company or any person in relation to whom they would have any liability or responsibility.

gravity separation

Our Australian based head office houses the world's largest spiral manufacturing facility and produces over 20,000 starts annually. In 2010/11, we manufactured HC33 and WW6 spirals for ArcelorMittal's Mont Wright mining operations in Canada to deliver the largest single spiral order in our history.

gravity separation | gravity separator machine in mineral processing

Gravity ore dressing/ gravity beneficiation/ gravity separation is one of the main ore beneficiation methods, includes heavy medium separation( DMS/ HMS), jigging, shaker concentrator, spiral chute concentrator. HMS and mineral jigs suit for the coarse ore particle, shaker has a high dressing accuracy, can be used in the weak magnetic iron mineral recovery plant, the spiral chute is very popular in the iron ore processing plant, besides, mineral centrifugal concentrators applied in the fine particle dressing. Specification of gravity separation method: low operating cost, little pollution. Main gravity separators machine as following.

put crushed ore material into the heavy medium fluid( density greater than waters), separate the two different materials under the flotation and sedimentation process of the buoyancy force. HMS/ DMS has a good effect on the little density difference, thus a high separation accuracy. besides, large production capacity is also a great advantage. heavy medium separation machines include a vibrating chute, ore dressing machine, cyclone, vortex, min particle low to 0.55mm.

Chinese mining machine manufacturers can provide several types of jig concentrators like trapezoid jig, rectangular jig, Remer vibratory jig, hydraulic press jig, sawtooth Pulsation Jig, pan American jig, circular mineral jig, eccentric jig, plunger jig, duplex gold jigs, moving sieve jig, Harz jig, etc. The working principle of the mineral jig: the ore particles in the jigging machine are mainly layered by means of the density differences, the bigger the gravity difference is, the higher the gravity separation efficiency is. it is necessary to keep layers with a certain shatter condition, if the material layer is very full and compaction, it will count against the jigging process, prolong the loose condition to improve the separation effect and capability.

Generally, the particle size of ore dressing in the shaking table is in the range of 0.037 ~ 3 mm. in recent years, the shaker table as the ancillary equipment to recover the weak magnetic iron mineral. whats more, shaking tables are widely used to separate tungsten, tin, niobium, tantalum and gold-bearing ores. The shaking table surface is the working platform, the surfaces material types include wood, glass fiber reinforced polyester resin and aluminum alloy, shaker surface with a wear protection layer and providing corrosion resistant layer, greatly prolong the service life. JXSC customers tin processing plant, 16 sets of shakers combine with the spiral separator, get a 60% tin concentrate.

Chute dressing machines include a spiral separator, spiral chute, vibrating chute, belt separator, centrifugal concentrator, etc. spiral separator is very popular in ore processing plants, meanwhile, an important and the widest used gravity separator machine. 4.1 Spiral separator mainly for coarse size ore, take Wabush iron ore dressing plant as an example. Material: quartz-type weakly magnetic iron ore Feed size: 0. 84 ~0mm 5 sets of spiral separators Effect: original ore degree 35%, concentrate %64. Chinese ore dressing machine manufacturers start to develop spiral dressing equipment since 1950, practice shows that it has a good performance with 75.36% recovery rate( run mine 41%, concentrate 56%). 4.2 Centrifugal concentrator We produce a fine particle cent concentrator for 0. 037 ~0. 010mm, I recent years, the gold centrifugal concentrator has a great development, plays a core role in the dressing plant of fine particle weak magnetic iron ore. Gold centrifuge combines with the chute, shaker improves the concentrate accuracy. JXSC mining machinery factory provides gravity separator since 1985, contact us to know the latest price of gravity separator machine.

Jiangxi Shicheng stone crusher manufacturer is a new and high-tech factory specialized in R&D and manufacturing crushing lines, beneficial equipment,sand-making machinery and grinding plants. Read More

gold centrifugal concentrator - mineral processing

The centrifugal concentrator rotates at a high speed, generating a high G force, which can separate small gravity recovery gold (less than 50 microns), which was of previously unrecoverable with traditional mineral jigs, spiral separator, and gravity tables.In recent years, the application of centrifugal force has proved to be an effective technology for recovering fine and heavy minerals. The centrifugal force acting on the mineral particles can reach 50 times its own gravity, thus significantly increasing the sedimentation speed of the particles. As the intensity of the centrifugal force increases, the size of the particles that can be captured becomes finer.

The centrifugal concentrator can be used to recover the tailings of chromite, gold, scheelite and other heavy minerals, so as to make better use of mineral concentrates. Their operating and equipment costs are relatively low. Thanks to its less environmental impact and good recovery of fine-grained minerals, the application of centrifugal concentration has become increasingly important worldwide.

The gold centrifugal concentrator is a gravity-enhancing device. The feed slurry is introduced into a rotating drum, and the impeller rotates to form a high-gradient centrifugal field. The ore particles flow on the inner wall of the rotor and are continuously layered and deposited on the smooth inside the centrifuge wall.The lighter particles outside the bed are removed from the rotor assembly due to their lower specific gravity or smaller size. Heavy particles remain in the concentration zone, where the concentrate is cleaned with fluidized water.A rotor spins the bowl, which throws the feed coming into the center against the walls of the bowl. Light and fine particles are carried out of the bowl with the tailings while heavy and coarse particles are collected and removed from the bowl. Industrially they can operate as batch or continuous units, with pores opening intermittently to collect concentrate.

screening media | mineral screening multotec

From wedge wire sieve bends and centrifuge baskets to completely optimised composite screen decks, Multotec is a leading screening media technology solutions provider for the global minerals processing industry.

We supply products covering the full range of screening applications, including sizing, dewatering, scalping and desliming. Refined over 45 years experience in mineral screening applications, Multotec manufactures one of the worlds largest ranges of rubber, polyurethane, wedge wire, steel and composite screening media.

Your local Multotec branch provides turnkey screening media solutions, with short lead times on screening media products, and engineering and field services to ensure your screening plant is optimised for your processing conditions, material and the output targets.

Multotec screening media has been developed in response to the worlds toughest mineral screening applications. We offer this global technology to the worlds mining and mineral processing houses through an established worldwide footprint that includes a complete network of branches and distributors in almost 100 countries on 6 continents.

Your local Multotec experts offer complete turnkey solutions for screening media installations, including design and engineering, installation and commissioning, and wear monitoring and field service support. Our teams will ensure the optimum screening media solution is supplied according to your specific plant and process parameters and requirements, such as feed tonnage required, the average particle size and the particle shape.

Multotec can design and build completely customised screening decks. Drawing on one of the worlds largest ranges of purpose-specific screen panels from materials including rubber, polyurethane, steel, woven-wire, ceramics, Hardox, fibreglass and combinations of these materials we can optimise each area of your screen deck to suit the conditions, your material and output targets.

A popular composite deck configuration is to place a set of panels with highly impact-resistant material at the feed end of the screen, where the impact of material from the feed box or chute is highest.

Weve supplied composite screen decks with over a dozen different types of panels, with each panel fulfilling a specific function. The apertures will be chosen according to the screens purpose and factors like the feed tonnage required, the average particle size and the particle shape. That way, we can ensure maximum mineral screening efficiency at the lowest overall cost.

Our monitoring software Hawkeye provides complete real time and historical intelligence of the condition of your screening media. Through accurately indicating screen media wear, Hawkeye helps optimise wear-related maintenance and reduces downtime, while ensuring your screening media reliably delivers the cut size your plant required.

By enabling plant operations and technical teams to systematically manage and analyse wear data from the screening deck, Hawkeye also provides a powerful planning system for on-going application improvement. By tracking the performance over time of the various panel types on each deck in operation, the screening requirements in each part of the deck can be constantly refined.

Multotec screen panels are manufactured standard with visual wear indicators. These wear indicators comprise four or five moulded cavities in the body of the panel, spaced at predetermined intervals below the upper wear surface. As the panel surface is worn away, so the individual cavities become visible, the final cavity of which indicates that a replacement must be conducted or planned shortly.

This simple but innovative system, patented by Multotec, not only indicates when replacement needs to take place, but can be used as a data source to measure the rate of wear so that a future replacement time can be predicted and planned.

Blinding occurs when dirt, minerals and other substances adhere and bridge across the apertures of your screening surface, creating a stubborn paste that blocks material from screening through. Pegging describes the presence of irregular material lodged in the screen apertures, and occurs when stones are about the same size as the holes.

Multotec, in partnership with universities across the globe, is constantly developing and testing new innovations and technologies to respond the challenges our customers face in processing minerals more efficiently, and at a lower cost. Our screening equipment of today reflects over 45 years of innovation and optimisation in the worlds largest mining and mineral processing operations.

Roy has been involved in mining and metallurgy since 1981, and has vast global experience in both the production and sales side of the industry, across Africa, Australia and South America. His commitment to product development, business development and customer satisfaction has made Roche one of the worlds leading experts in screening media solutions.

compare high-g & low-g centrifugal concentrators - gravity separation & concentration methods - metallurgist & mineral processing engineer

We are considering acquiring an iCON-i350 Centrifugal Concentrator ( http://www.iconcentrator.com ); a Falcon SB350 equivalent. However, we got an attractive offer of two units of Oro Low-G 16 Horizontal Centrifuge Primary Concentrators (used, but in excellent condition); for the price of one gravity iCON-i350.

The companys brochures ( http://www.oro-industries.com/centrifuge_oro-industries.php ) promote the Low-G Horizontal Primary Concentrators as High volume, zero loss and capable of recovering 80% to 90% of free gold down to 200 mesh. These claims, together with the attractive offer price, surely got our attention.

However, it also presents a sort of contradictory dichotomy; in the sense that the common rule of thumb in gravity concentration states that: Highest G-Forces = Highest Fines Recovery Hence my confusion.

The principle of the multi-gravity separator (MGS) can be visualized as rolling the horizontal surface of a conventional shaking table into a drum, then rotating it so that many times the normal gravitational pull can be exerted on the mineral particles as they flow in the water layer across the surface.Belowisa cross section of the pilot scale MGS. The Mine Scale MGS consists of two slightly tapered open-ended drums, mounted "back to back. rotating at speeds variable between 90 and 150 rpm, enabling forces of between 5 and 15 G to be generated at the drum surfaces.

A sinusoidal shake with an amplitude variable between 4 and 6 cps is superimposed on the motion of the drum, the shake imparted to one drum being balanced by the shake imparted to the other, thus balancing the whole machine.

A scraper assembly is mounted within each drum on a separate concentric shaft, driven slightly faster than the drum but in the same direction.This scrapes the settled solids up the slope of the drum, during which time they arc subjected to countercurrent washing before being discharged as concentrate at the open, outer, narrow end of the drum. The lower density minerals, along with the majority of the wash water, flow downstream to discharge via slots at the inner end of each drum.

They were known as Johnson Drums or the old Denver Gold Saver.The primary concentrators are typically Johnson drums, the concentrate being cleaned either by shaking tables or endless-belt strokes to produce a high grade concentrate suitable for amalgamation.

The Johnson concentrator consists of a continuously rotating cylindrical drum, which is tilted slightly and lined internally with riffled rubber sheeting. Pulp flows through the drum, and the concentrate collects in the riffles. As the drum turns, the concentrate is carried to the top and washed into a launder. The endless-belt strake, which is usually used to clean the concentrate, consists of a flat, endless rubber belt, inclined slightly to the horizontal. The upper surface has saw-tooth riffles running across the belt. The belt moves continuously against the pulp stream and spray water washes the concentrate from the riffles after the belt passes over the head pulley. All similar tohttps://www.911metallurgist.com/blog/mechanical-automatic-gold-panner

The plane table is a high capacity roughing device used on some of the South African mines. It consists of riffled rubber, covering a series of inclined smooth surfaces with steps between them. Pulp flows down the length of the riffles, which collect the concentrate, which is drawn off through the slots and is collected at the end of the table. The concentrates are then cleaned, usually by shaking tables.

Gravity concentration plants are very effective at recovering fully liberated gold of sizes greater than 50 m, and some equipment is effective at sizes down to about 10 m. However, gold can be lost in the following forms:

Flakey gold orgold grains or flakes with a median diameter of 20 to 30m were captured into the gravity concentrates, which presents a larger surface area in one plane, allowing it to be carried away with lighter particles in flowing film separators, such as shaking tables

Hydrophobic gold, which adheres to the water-air interface, giving the particle an artificially low apparent density and reports to the tailings (e.g., gold coated with fine hydrocarbon or sulfurous material)

Since a Low-G machine is a rotating shaker table, look below at the size recovery % of a shaking table. As your salesman tells you, recovery on gold finer than 200 mesh drops fast. On the bottom graph you see the by-size recovery of a High-G holds up until 20um.

DISCLAIMER: Material presented on the 911METALLURGIST.COM FORUMS is intended for information purposes only and does not constitute advice. The 911METALLURGIST.COM and 911METALLURGY CORP tries to provide content that is true and accurate as of the date of writing; however, we give no assurance or warranty regarding the accuracy, timeliness, or applicability of any of the contents. Visitors to the 911METALLURGIST.COM website should not act upon the websites content or information without first seeking appropriate professional advice. 911METALLURGY CORP accepts no responsibility for and excludes all liability in connection with browsing this website, use of information or downloading any materials from it, including but not limited to any liability for errors, inaccuracies, omissions, or misleading statements. The information at this website might include opinions or views which, unless expressly stated otherwise, are not necessarily those of the 911METALLURGIST.COM or 911METALLURGY CORP or any associated company or any person in relation to whom they would have any liability or responsibility.

minerals - gekko systems

Gekko Systems are world leaders ingravity separationand recovery ofgoldandcomplex gold. Gekkos unique core technologies and innovative flowsheets also efficiently extract other high-value minerals, such assilver,coal,polymetallicsandgemstones.

Gekkospre-concentration,gangue rejection,comminution design,feed preparation,gravity concentrationandintensive leachingflowsheets are fully optimised to exploit specific mineral and ore body characteristics. This guarantees successful, cost-efficient recoveries and step-change benefits for mining operations.

Today, however, more milling energy is consumed due to the change in mineralogy of gold resources. For substantial energy savings and proven high returns, an innovativecircuit for free gold recovery is essential.

At the coarse 350 micron 20mm ore size, apre-concentrationjigging circuit can be designed incorporating a proven, efficient recovery device for free gold: theInLine Pressure Jig. Used globally in over215 installations, theInline Pressure Jigreceives very coarse free gold (up to 30mm), reducing downstream operating costs and environmental impacts.

For fine free gold ores of 50 350 micron, a conventional gravity box circuit that incorporates a modern centrifugal concentrator is recommended. Higher centrifugal g forces extract the free gold particles. TheInLine Spinneris perfect for low water consumption operations and will produce a smelter-ready product.

If testwork has been completed on the ore body, the Gekko team can get started today. If not,Gekkos fully accredited Laboratory Servicewill analyse the ore. Then ore test results will guide Gekkos engineering team to design the best ore-specific gravity recovery flowsheet.

Gekko will help recover free gold from different ore sizes with diverse mineralogy and gold distribution. Gekko will design a free gold recovery flowsheet that will optimise operations with improved returns and environmental benefits.

Sulphide complex gold can occur in a wide range of particle sizes. Because cyanide cannot always leach sulphide-associated gold, regrinding the ore is typically required to expose the free gold for recovery byintensive leaching.

Pre-concentrationof coarse 350 500 micron sulphide-associated gold ore, using theInLine Pressure Jig, is required to reject gangue from the high value material. TheIPJ, a classic pre-concentration device, is effective in gangue rejection prior to further processing of valuable gold-bearing material.

Other turnkey modular systems forpre-concentratingcoarse sulphide-gold ores include thePythonplant and theGravity Flotation Intensive Leach (GFIL) systems, both of which incorporate theInLine Pressure Jig.

Regrinding ofpre-concentratednon-refractory sulphide complex gold material, by a conventional regrind mill, can producefree goldparticles. This improves the amount of gold that can be recovered by further processing using equipment such as theInLine Leach Reactor.

Laboratory testworkmust be completed on the ore body. Its important to characterise the presence of coarse sulphides or dissociated sulphides, as well as find out whether the ore is refractory or not, and what grade (g/T) the ore is. This information is critical for Gekko to begin to design an optimal recovery flowsheet for a specific ore.

Therefore, if testwork has not been done, its recommend the ore be analysed by Gekkos fully accreditedLaboratory Serviceto enable the best design of an effective flowsheet that recovers sulphide complex gold at the lowest operating and capital costs.

Silver is a precious metal often recovered as a by-product of other metal refining, such as gold. Silver occurs as a free metal mineral, as well as silver sulphide, silver arsenic sulphide and silver lead sulphide complexes.

The good news is that Gekko offers a high-throughput solution for removing impurities during recovery, which produces a purer, high-grade silver concentrate. And better returns for silver mine operators.

In the past, crude silver concentrate was produced and sold to smelters. However, mine operators are now taking advantage of additional profits that can be gained by on-sitecyanide leachingusing theInLine Leach Reactor (ILR).

Perfectingcyanide leachingchemistry is easy with the ILR. The ILRs adjustable intensive conditions, such as higher cyanide concentrations and longer leaching times are fine-tuned to maximise silver recovery. TheILRis scalable to high tonnage operations.

Because Gekkos ILRs provide a well-mixed system, superior dissolution of silver from surfaces occurs. The innovative design uses less solution volume, meaningless cyanide to detoxify, which isbetter for the environment. Also less energy is required for the ILRs rolling agitation mechanism, compared to other systems.

To process high-grade silver-bearingpregnant solutionsto pure silver concentrates,electrowinningis best performed using Gekkos innovativeelectrowinning cell. This cell is specifically engineered to handle large volumes of high-value solutions typically generated by silver recovery operations. The cells high current density and unique drop site design, for collecting silver solids, ensures thatelectrowinningis efficient and continues uninterrupted.

Intricate leaching chemistry kinetics to liberate silver from unwanted material must be specifically tailored to each new ore deposit. Gekko recommend completelaboratory testworkbe performed before initiating the design of an effective silver recovery plant.

For Gekko to best optimise a silver recovery process, an understanding of current operations and/or future plans is needed. Gekko will ask questions such as: Is the plant producing a flotation concentrate or a gravity concentrate? Is it high-grade or low-grade? What material tonnages are being handled? What is the size of the ore? What is the associated mineralogy of the silver deposit?

It is possible to recover and separate multiple metals from a single polymetallic ore deposit. For instance, lead, silver and zinc frequently exist in the same ore and have high, yet differing, specific gravities.

Traditionally, polymetallic compounds were separated by flotation or dense media separation processes. However, the development of continuous gravity devices, such as GekkosInLine Pressure Jig, employsgravity separationto recover metal compounds from polymetallic ores in a cost-effective manner.

Gekkos innovativeInLine Pressure Jigis the core technology for recovering multiple metals from polymetallic material. The IPJ utilises the differences in specific gravity of different metal-bearing minerals. This allows improved separation of each metal for easier, more cost-effective downstream processing.

Gekko recommend completelaboratory testworkon all polymetallic ore deposits. This will ensure that Gekkometallurgistsand engineers understand the materials metal composition and importantgravity separationconsiderations.

In fact, Stokes Law defining the physical settling and separation of solids, as well as viscosity and fluid dynamics, all play a part in determining an optimal process circuit for recovering tin/tantalum, diamond, garnet and other gemstones.

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