Max Feeding size <25mm Discharge size0.075-0.4mm Typesoverflow ball mills, grate discharge ball mills Service 24hrs quotation, custom made parts, processing flow design & optimization, one year warranty, on-site installation.
Ball mill, also known as ball grinding machine, a well-known ore grinding machine, widely used in the mining, construction, aggregate application. JXSC start the ball mill business since 1985, supply globally service includes design, manufacturing, installation, and free operation training. Type according to the discharge type, overflow ball mill, grate discharge ball mill; according to the grinding conditions, wet milling, dry grinding; according to the ball mill media. Wet grinding gold, chrome, tin, coltan, tantalite, silica sand, lead, pebble, and the like mining application. Dry grinding cement, building stone, power, etc. Grinding media ball steel ball, manganese, chrome, ceramic ball, etc. Common steel ball sizes 40mm, 60mm, 80mm, 100mm, 120mm. Ball mill liner Natural rubber plate, manganese steel plate, 50-130mm custom thickness. Features 1. Effective grinding technology for diverse applications 2. Long life and minimum maintenance 3. Automatization 4. Working Continuously 5. Quality guarantee, safe operation, energy-saving. The ball grinding mill machine usually coordinates with other rock crusher machines, like jaw crusher, cone crusher, to reduce the ore particle into fine and superfine size. Ball mills grinding tasks can be done under dry or wet conditions. Get to know more details of rock crushers, ore grinders, contact us!
Ball mill parts feed, discharge, barrel, gear, motor, reducer, bearing, bearing seat, frame, liner plate, steel ball, etc. Contact our overseas office for buying ball mill components, wear parts, and your mine site visits. Ball mill working principle High energy ball milling is a type of powder grinding mill used to grind ores and other materials to 25 mesh or extremely fine powders, mainly used in the mineral processing industry, both in open or closed circuits. Ball milling is a grinding method that reduces the product into a controlled final grind and a uniform size, usually, the manganese, iron, steel balls or ceramic are used in the collision container. The ball milling process prepared by rod mill, sag mill (autogenous / semi autogenous grinding mill), jaw crusher, cone crusher, and other single or multistage crushing and screening. Ball mill manufacturer With more than 35 years of experience in grinding balls mill technology, JXSC design and produce heavy-duty scientific ball mill with long life minimum maintenance among industrial use, laboratory use. Besides, portable ball mills are designed for the mobile mineral processing plant. How much the ball mill, and how much invest a crushing plant? contact us today! Find more ball mill diagram at ball mill PDF ServiceBall mill design, Testing of the material, grinding circuit design, on site installation. The ball grinding mill machine usually coordinates with other rock crusher machines, like jaw crusher, cone crusher, get to know more details of rock crushers, ore grinders, contact us! sag mill vs ball mill, rod mill vs ball mill
How many types of ball mill 1. Based on the axial orientation a. Horizontal ball mill. It is the most common type supplied from ball mill manufacturers in China. Although the capacity, specification, and structure may vary from every supplier, they are basically shaped like a cylinder with a drum inside its chamber. As the name implies, it comes in a longer and thinner shape form that vertical ball mills. Most horizontal ball mills have timers that shut down automatically when the material is fully processed. b. Vertical ball mills are not very commonly used in industries owing to its capacity limitation and specific structure. Vertical roller mill comes in the form of an erect cylinder rather than a horizontal type like a detachable drum, that is the vertical grinding mill only produced base on custom requirements by vertical ball mill manufacturers. 2. Base on the loading capacity Ball mill manufacturers in China design different ball mill sizes to meet the customers from various sectors of the public administration, such as colleges and universities, metallurgical institutes, and mines. a. Industrial ball mills. They are applied in the manufacturing factories, where they need them to grind a huge amount of material into specific particles, and alway interlink with other equipment like feeder, vibrating screen. Such as ball mill for mining, ceramic industry, cement grinding. b. Planetary Ball Mills, small ball mill. They are intended for usage in the testing laboratory, usually come in the form of vertical structure, has a small chamber and small loading capacity. Ball mill for sale In all the ore mining beneficiation and concentrating processes, including gravity separation, chemical, froth flotation, the working principle is to prepare fine size ores by crushing and grinding often with rock crushers, rod mill, and ball mils for the subsequent treatment. Over a period of many years development, the fine grinding fineness have been reduced many times, and the ball mill machine has become the widest used grinding machine in various applications due to solid structure, and low operation cost. The ball miller machine is a tumbling mill that uses steel milling balls as the grinding media, applied in either primary grinding or secondary grinding applications. The feed can be dry or wet, as for dry materials process, the shell dustproof to minimize the dust pollution. Gear drive mill barrel tumbles iron or steel balls with the ore at a speed. Usually, the balls filling rate about 40%, the mill balls size are initially 3080 cm diameter but gradually wore away as the ore was ground. In general, ball mill grinder can be fed either wet or dry, the ball mill machine is classed by electric power rather than diameter and capacity. JXSC ball mill manufacturer has industrial ball mill and small ball mill for sale, power range 18.5-800KW. During the production process, the ball grinding machine may be called cement mill, limestone ball mill, sand mill, coal mill, pebble mill, rotary ball mill, wet grinding mill, etc. JXSC ball mills are designed for high capacity long service, good quality match Metso ball mill. Grinding media Grinding balls for mining usually adopt wet grinding ball mills, mostly manganese, steel, lead balls. Ceramic balls for ball mill often seen in the laboratory. Types of ball mill: wet grinding ball mill, dry grinding ball mill, horizontal ball mill, vibration mill, large ball mill, coal mill, stone mill grinder, tumbling ball mill, etc. The ball mill barrel is filled with powder and milling media, the powder can reduce the balls falling impact, but if the power too much that may cause balls to stick to the container side. Along with the rotational force, the crushing action mill the power, so, it is essential to ensure that there is enough space for media to tumble effectively. How does ball mill work The material fed into the drum through the hopper, motor drive cylinder rotates, causing grinding balls rises and falls follow the drum rotation direction, the grinding media be lifted to a certain height and then fall back into the cylinder and onto the material to be ground. The rotation speed is a key point related to the ball mill efficiency, rotation speed too great or too small, neither bring good grinding result. Based on experience, the rotat
ion is usually set between 4-20/minute, if the speed too great, may create centrifuge force thus the grinding balls stay with the mill perimeter and dont fall. In summary, it depends on the mill diameter, the larger the diameter, the slower the rotation (the suitable rotation speed adjusted before delivery). What is critical speed of ball mill? The critical speed of the ball mill is the speed at which the centrifugal force is equal to the gravity on the inner surface of the mill so that no ball falls from its position onto the mill shell. Ball mill machines usually operates at 65-75% of critical speed. What is the ball mill price? There are many factors affects the ball mill cost, for quicker quotations, kindly let me know the following basic information. (1) Application, what is the grinding material? (2) required capacity, feeding and discharge size (3) dry or wet grinding (4) single machine or complete processing plant, etc.
The industrial magnetic separation machine can be divided into the weak magnetic separator and strong magnetic separator (high-intensity magnetic separator). This article mainly introduces the types of weak magnetic separators, includes dry type, wet type, and auxiliary equipment.
You may interest in How many types of magnetic separators? What magnetic separators machine JXSC supply? wet type, dry type, high intensity, three-disc, etc. Contact us for magnetic separation machine selection help, price, processing plant design.
The iron remover is used to remove the iron lump and iron slag from the raw material, have an electromagnetic type and permanent magnet type. Iron remover installation: fixed suspension and belt suspension. A fixed suspended iron remover is suspended above the conveyor belt to pick up iron from the material flow. The width of the magnet corresponds to the width of the belt conveyor. It needs manually remove the iron from the magnet, so it only used in the small processing plants.
The belt suspension iron remover has two installation methods, as shown in the figure below. One is that the iron remover and the conveyor belt cross at right angles, and the iron is discharged from the side of the conveyor belt; the other is that the iron remover is in the same direction as the conveyor belt, and the iron is discharged from the front end of the material stream. It is used for extracting bulk iron materials, can be used for iron removing or iron recovering from coal, iron slag and steel slag, industrial waste and other materials.
Magnetic pulleys, also known as magnetic rollers, are available in both electromagnetic and permanent magnets. The permanent magnet pulley has a simple structure, no power consumption, reliable work, easy maintenance, and wide application. 1 Equipment structureBarium ferrite constitutes a multi-pole magnetic system with a magnetic wrap angle of 360 degrees, and a rotating cylinder made of a non-magnetic material is placed outside the magnetic system. 2 Magnetic system and magnetic field characteristicsWhen the material size of the treated material is less than 20mm, the alternating polarity is beneficial to improve the beneficiation efficiency. 3 Beneficiation process ore material evenly and constantly feed on the belt, when the ore passes through the magnetic pulley, the non-magnetic or weak magnetic ore particles are separated from the belt surface by centrifugal force and gravity; while the strong magnetic particles attracted to the belt by the action of the magnetic force and is carried by the belt to the lower part of the magnetic pulley. After the belt away the magnetic pulley, the magnetic force of the magnetic ore particles is weakened and falls into the magnetic product tank. The yield and quality of the product are adjusted by the position of the separation baffle mounted under the magnetic pulley.
4 Application Pre-selection for big size (10~120mm) strong magnetic ore, it usually be installed after the coarse crushing operation, separates the surrounding rock. In some concentrating plants, the magnetic pulley is installed between the fine crushing process and the grinding process, picking up part of the tailings, which can reduce the amount of ore and improve the grade. In the operation of the hematite ore roasting, the roasting quality is controlled by a magnetic pulley, so that the ore which is not sufficiently reduced is separated by a magnetic pulley and returned to the roasting furnace for magnetization roasting.
Drum magnetic separator main parts: Permanent magnet fixed magnetic system, feeding part (upper or lower feeding), discharge part, transmission and frame. 1 Structure-The cylinder is made of 2mm FRP and the surface is coated with a layer of wear-resistant rubber. The magnetic system consists of a barium ferrite permanent magnet block with a magnetic envelope angle of 270 degrees. The polarity of the magnetic poles alternates in the circumferential direction and the polarities are uniform along the axial direction. The main reason for the use of FRP for cylinders instead of stainless steel is to prevent the drum from heating due to eddy currents. The drum magnetic separator has two types of a single cylinder and double cylinder. The sorting length of the single-cylinder can be adjusted by the position of the baffle. The double-barrel machine can adjust the magnetic system declination to adapt to the needs of different sorting processes (concentrating or scavenging).
2 Beneficiation process The fine dry ore particles are firstly fed into the upper drum by the electric vibrating feeder, the magnetic ore particles are attracted on the cylinder surface and be discharged. The non-magnetic ore particles are thrown away from the cylinder surface by gravity and centrifugal force, and enter the lower drum for sorting. The non-magnetic ore particles enter the tailings trough, the rich aggregate enters the concentrate tank.
3 Applications Dry tye separation for fine-grained strong magnetic ore; Removing magnetic impurities and purifying magnetic materials from powdery materials, widely used in metallurgy, machinery, chemical, electric power, building materials and so on. Foreign dry-type weak magnetic cylinder magnetic separators include the former Soviet Unions cylindrical magnetic separator and the Sala Mortsell magnetic separator.
Permanent magnetic cylinder magnetic separator main parts: cylinder, magnetic system, sorting tank, feeding port, discharging and overflowing part. The cylinder can transport the adsorbed magnetic particles and prevent the slurry from immersing in the magnetic system. The cylinder and end cap are made of non-magnetic, high resistivity and corrosion-resistant materials. The tank in the magnetic field is made of austenitic stainless steel and is lined with synthetic material to prevent wear. Adding auxiliary magnetic pole to the gap of the main magnetic pole of the permanent magnetic cylinder magnetic separator, which can increase the magnetic field strength and the depth of action, and improve the production capacity and the sorting effect. The wet cylindrical magnetic separator has three tank structures: a forward flow, a reverse flow, and a semi-reverse flow.
The magnetic desilting tank is also called a magnetic dewatering tank. It is a dressing device that combines gravity and magnetic effect, widely used in the magnetic separation process to remove slime and fine-grained gangue, and also as a concentrator before filtration. Advantages of simple structure, no moving parts, convenient maintenance, simple operation, large processing capacity and good beneficiation effect.
In the magnetic desilting tank, the forces that the ore particles receive are gravity, magnetic force and water flow force. Gravity causes the ore particles to settle, and the magnetic force accelerates the sedimentation of the magnetic ore particles and adheres on the surface of the magnetic system. The rising water flow can prevent the sedimentation of the non-magnetic fine-grained gangue and the slime, and cause them to flow into the overflow. Thus, separate from magnetic ore particles from gangue. The ascending water flow can also make the magnetic ore particles loose, flush out and improve the concentrate grade.
In order to improve the beneficiation effect of the magnetic desilting tank, the ore particles are pre-magnetized before being selected, so that the fine-grained ferromagnetic materials are condensed into larger magnetic agglomerates. The sedimentation velocity of the magnetic agglomerates is faster than that of the non-magnetic particles, which is conducive to subsequent magnetic deliming and the like.
The demagnetizer disperses the ferromagnetic agglomerates. The commonly used demagnetizer structure is shown in the figure below. It is a tower-shaped coil that is placed on a non-magnetic material tube and works by alternating current. When the ferromagnetic mass passes through an alternating magnetic field whose magnetic field strength is changed from large to small, the magnetic particle has repeatedly magnetized a plurality of times, so that the magnetic energy product of the magnetic particle is smaller than once, and finally, the residual magnetism is lost.
Xinhai magnetite dry separator is the upgrade magnetite processing machine of a conventional magnetic roller and dry separator. When the grade is same even lower, under the condition of different properties of rich and lean magnetite, by adjusting corresponding technical parameters of the upgraded magnetite, it can throw more tail around 10% to 30% compared to the conventionalmagnetic rollerordry separator. This dry separator is an eccentric layout rotation magnetite dry separator. Here is a general introduction.
This dry separator solves problems of conventional rotating magnetic separator like eddy heating, easy ore-viscosity and hard ore-discharge made by the separating shell. The conventional one must use a belt to discharge ore, magnetic ore can easily go into the inner of the belt and the shell and it can not discharge ore automatically, it has a low separating effect, and the shell and belt will be worn quickly. This will greatly affect the production. In actual production, calculate each magnetite processing machine one million tons ore in one year, the eccentric layout rotation magnetite dry separator can screen 100 to 300 thousand tons of qualified dry tailings before grinding. Making the quantity of waste stone greatly reduced at the same time reduce concentration ratio and production cost and improve the productivity of each ball mill in each year by 100 to 300 thousand. If the cost of grinding, magnetic separating and tailing processing machine is thirty yuan per ton, eachmagnetite mining machine can reduce three to nine million yuan in each year. Under the same condition of the mining amount, the production of iron concentrate will improve accordingly.
Without the expansion of the plant and increase of investment in grinding equipment, roads, water supply and tailing disposal, using this Xinhai magnetic dry separator ofmagnetite mining machinealmost does not increase electricity load and labor personnel and improve the efficiency of production and achieve significant economic and environmental benefit.
Description Arsenic (As) is classed as a semi-metal, or metalloid. In nature it is commonly found as a metal in low levels in most soils and in higher concentrations associated with some copper, lead and zinc ores. The most common arsenic mineral is arsenopyrite, a compound of iron, arsenic, and sulfur.
Relation to Mining Arsenic metal very rarely occurs in its pure form in nature. The most common arsenic mineral is arsenopyrite, a compound of iron, arsenic, and sulfur. Several other, less-common minerals contain arsenic, including orpiment, realgar, and enargite, which are arsenic sulfides. Most arsenic is obtained not from an ore mineral of arsenic, but as a by-product in the treatment of gold, silver, copper, and other metal ores. Environmental laws require that arsenic be removed from ores, so that it does not enter the environment in effluent gases, fluids, or solids.
Significant quantities of arsenic are associated with the copper-gold deposits in Chile, the Philippines, and many other countries. However, many countries produce by-product arsenic from smelting of metal ores. China is by far the largest producer, with Chile and Morocco providing important amounts, and lesser production from about a dozen other countries with metal smelters.
The United States has not mined arsenic since 1985, and imports all the metallic arsenic and arsenic compounds that it consumes. Very little is recycled, except in waste from factories that make arsenic compounds and limited quantities of arsenic metal have been recovered from gallium-arsenide (GaAs) semiconductor scrap. Uses Only about 5% of arsenic consumption is of the metallic element. Most of this is used to alloy (mix) arsenic with lead, copper, or other metals for specific uses. As a metalloid, arsenic is a semiconductor, like silicon. This means it conducts some electricity like a metal, but not all the electricity a true conductor like copper would conduct. Consequently, about 1/10 % of arsenic is consumed in the manufacture of gallium arsenide semiconductors for use in electronics. Some arsenic is also used in glass-making.
The majority of U.S. consumption is in the form of chromated copper arsenate (CCA), a chemical used as a wood preservative for telephone poles, fence posts, pilings, and foundation timbers. The CCA significantly reduces rot and eliminates wood destruction by termites, ants and other insects. However, the use of CCA is being phased out in the U.S., and a major decrease in the arsenic market is expected as a result.
Formerly the most important use of arsenic compounds, was as an insecticide sprayed in fields and orchards. This use has entirely disappeared in most countries, due to the poisonous nature of arsenic compounds. Arsenic contamination is a problem in some well-water and may be associated with mine drainage.
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.
Lithium-sulfur batteries are attractive for energy storage due to their ultrahigh theoretical energy density and low material cost. But the biggest factor impeding the development of the batteries is its rapid irreversible capacity decay due to the shuttle effect. To inhibit it, the glass fiber membrane modified by magnetic mesoporous Fe3O4 mixed with Ketjen black is designed and used as the separator for lithium-sulfur batteries in this work. The assembled battery using the modified separator exhibits an excellent initial capacity of 1274.5mAhg1 and a high coulombic efficiency of about 90% at 0.2C first cycle. The improved performance of batteries can be ascribed to the good conductivity, mesoporosity, and magnetic property of Fe3O4 nanoparticles on the separator, which enables the trapping and activation of the soluble polysulfides in lithium-sulfur batteries. The work indicates that magnetic mesoporous Fe3O4 can open new avenues to improve the performance of lithium-sulfur batteries.
Yoo JT, Cho SJ, Jung GY, Kim SH, Choi KH, Kim JH, Lee SY (2016) COF-net on CNT-net as a molecularly designed, hierarchical porous chemical trap for polysulfides in lithium-sulfur batteries. Nano Lett 16(5):32923300
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Zhang Y, Zhao Y, Konarov A, Li Z, Chen P (2015) Effect of mesoporous carbon microtube prepared by carbonizing the poplar catkin on sulfur cathode performance in Li/S batteries. J Alloys Compd 619:298302
Yao H, Zheng G, Hsu PC, Kong D, Cha JJ, Li W, Narasimhan VK (2014) Improving lithium-sulphur batteries through spatial control of sulphur species deposition on a hybrid electrode surface. Nat Commun 5:3943
Hong YJ, Lee JK, Kang YC (2017) Yolkshell carbon microspheres with controlled yolk and void volumes and shell thickness and their application as a cathode material for Li-S batteries. J Mater Chem A 5(3):988995
Xiao L, Cao Y, Xiao J, Schwenzer B, Engelhard MH, Saraf LV, Liu J (2012) A soft approach to encapsulate sulfur: polyaniline nanotubes for lithium-sulfur batteries with long cycle life. Adv Mater 24(9):11761181
Li Z, Li C, Ge X, Ma J, Zhang Z, Li Q, Yin L (2016) Reduced graphene oxide wrapped MOFs-derived cobalt-doped porous carbon polyhedrons as sulfur immobilizers as cathodes for high performance lithium sulfur batteries. Nano Energy 23:1526
Liu YT, Han DD, Wang L, Li GR, Liu S, Gao XP (2019) LithiumSulfur Batteries: NiCo2O4 Nanofibers as Carbon-Free Sulfur Immobilizer to Fabricate Sulfur-Based Composite with High Volumetric Capacity for LithiumSulfur Battery. Adv Energy Mater 9(11):1970030
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Li N, Cao W, Liu Y, Ye H, Han K (2019) Impeding polysulfide shuttling with a three-dimensional conductive carbon nanotubes/MXene framework modified separator for highly efficient lithium-sulfur batteries. Colloid Surface A 573:128136
Zhu M, Wang Y, Long L, Fu X, Sui G, Yang X (2019) An optimal carbon fiber interlayer integrated with bio-based gel polymer electrolyte enabling trapping-diffusion-conversion of polysulfides in lithium-sulfur batteries. Chem Eng J 370:10681076
Wang S, Qian X, Jin L, Rao D, Yao S, Shen X, Qin S (2017) Separator modified by Y2O3 nanoparticles-Ketjen Black hybrid and its application in lithium-sulfur battery. J Solid State Electrochem 21(11):32293236
Lin S, Cai YR, Yang J, Ruan FX, Wu J, Sireesh BB, Yao X, Gao JK, Yao JM (2019) Entrapment of polysulfides by a Ketjen Black & mesoporous TiO2 modified glass fiber separator for high performance lithium-sulfur batteries. J Alloys Compd 779:412419
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The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, National Engineering Lab for Textile Fiber Materials and Processing Technology, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China
Zhu, R., Lin, S., Jiao, J. et al. Magnetic and mesoporous Fe3O4-modified glass fiber separator for high-performance lithium-sulfur battery. Ionics 26, 23252334 (2020). https://doi.org/10.1007/s11581-019-03350-5
Spiral Chute is the best equipment for mining and mineral processing, which combines the characteristics of the spiral concentrator, shaking table and Centrifugal concentrator. It is made of the fiberglass lined with wear-resistant polyurethane and corundum cover, light moisture-proof, anti-rust. The spiral separator has the advantages of small occupation area, small water consumption, simple structure, no energy consumption, large capacity, easy installation, easy operation, small investment.
We supply different types of gravity separation equipment, such as gold centrifugal concentrator, shaking table, wet spiral concentrator. Spiral classifier applied in different conditions of extraction process dense media separation. Besides, the spiral chute design is available. email us to know the spiral classifier price. Mining equipment list
The Spiral separator/ spiral chute is the earliest mining machine. It has been used to classify the granularity 0.3-0.02 millimeters fine grain like iron, tin, tungsten, tantalum-niobium, gold ore, coal mine, monazite, rutile, zircon, and other metals. The non-metallic minerals which have a big enough specific gravity difference. Spiral chute principleRaise the spiral chute and fix it in the proper position, sand pump send the ore to the feed inlet, adding water to adjust the concentration of the slurry. The slurry naturally swirls from high to low and generates an inertial centrifugal force in the rotating bevel flow rate. The mineral is separated from the sand by the gravity and centrifugal force of the swirl by the difference in specific gravity, grain size and shape of the ore. The concentrate flows into the concentrate bucket and is connected by the pipeline. The tail sand flows into the tailing sand bucket and is connected to the sand pool by the pipeline, and then drained by the sand pump to complete the whole process of the beneficiation.
MACSALAB Drive Rolls for Rod / Ball Mills are Rubber coated and manufactured in Double and Triple Roll models. The Rolls are 120 mm diameter x 1200 mm long and powered by a 0.37 KW 220 Volt Motor with a variable speed controller.
The Ball/Rod mills are meant for producing fine particle size reduction through attrition and compressive forces at the grain size level. They are the most effective laboratory mills for batch-wise, rapid grinding of medium-hard to very hard samples down to finest particle sizes.
A horizontal rotating cylinder (vessel) is partially filled with balls/rods (grinding media), usually stone or metal, which grinds material to the necessary fineness by friction and impact with the tumbling balls/rods. A rotating drum throws material and balls/rods in a counteracting motion which causes impact breakage of larger particles and compressive grinding of finer particles. Attrition in the charge causes grinding of finer particles.
Try to limit the size of the batch to 25% of the total vessel volume which is sufficient to fill the voids and slightly cover the grinding Media. Any larger batches cause the balls to spread out throughout the mass of solids so they cannot make effective contact with each other, because of the layers of material between them. This greatly reduces the grinding efficiency of the mill and in some cases makes it impossible to attain the desired results.
The Feed size should preferable be 8 mesh or smaller, although many operations start with much larger pieces. Having the feed material as fine as possible enables the use of smaller sizes of grinding media, which are always best for fine uniform grinding and dispersions. For hard material it is especially advantageous to start with a fairly fine product.
Manganese is widely distributed in nature, and almost all kinds of ores and silicate rocks contain manganese. In modern industry, manganese and its compounds are widely used in various economic fields, of which the iron and steel industry is one of the most important fields. The amount of manganese used is as high as 90%-95%, which is mainly used as a deoxidizer and desulfurizer for iron and steelmaking.
Manganese oxide oreManganese oxide ore is mainly composed of secondary manganese oxide ore of weathered deposits, in addition to some primary and secondary manganese oxide ore of sedimentary and hydrothermal deposits. The manganese minerals in the manganese oxide ore are mainly dolomite, pyrolusite and hydromanganese ore; the gangue minerals are mainly silicate and carbonate minerals, often accompanied by iron, phosphorus and nickel, cobalt and other components.
Manganese carbonate oreThe manganese minerals in sedimentary manganese carbonate ore mainly include rhodochrosite, calcium rhodochrosite, manganese-containing calcite and rhodochrosite; gangue minerals include silicate and carbonate minerals, often accompanied by impurities such as sulfur and iron. The ore is generally more complex, and the particle size of the manganese mineral inlay is as fine as micrometers, which is not easy to dissociate, and it is often difficult to obtain a higher concentrate grade.
Because most manganese ores are fine-grained or fine-grained, and there are a considerable number of high-phosphorus ores, high-iron ores and symbiotic (associated) beneficial metals, it is very difficult to classify. At present, the commonly used manganese ore beneficiation methods include physical beneficiation (washing and screening method, gravity separation method, strong magnetic separation method, flotation method, combined beneficiation method), chemical beneficiation (leaching method) and special beneficiation (fire method enrichment method) ).
Ore washing mainly uses mechanical scrubbing machine to separate the ore from the mud. Commonly used equipment includes ore washing sieve, cylindrical ore washing machine and trough ore washing machine. Usually, the ore washing operation is accompanied by the sieving operation. Directly flush the water on the vibrating screen or send the ore (net ore) obtained by the ore washing machine to the vibrating screen for screening. Screening can be used as an independent part to separate products of different particle sizes and grades for different uses.
At present, the gravity separation method is only suitable for sorting manganese ore with a simple structure and coarser particle size, especially manganese oxide ore with a higher density. Commonly used gravity separation methods include heavy-medium beneficiation, jig beneficiation and shaker beneficiation.The beneficiation process of manganese oxide ore is generally to crush the ore to 6-0mm or 10-0mm, and then to classify, coarse grade particles are sent to jig sorting, and fine grade particles are sent to shaker for sorting.
Manganese minerals are weak magnetic minerals (specific magnetization coefficient X=1010-6~60010-6cm3/g), can be effectively recovered in a strong magnetic field magnetic separator with a magnetic field strength of Ho=800-1600kA/m (10000-20000oe), and the grade of manganese can generally be increased by 4-10%.Because the magnetic separation method has the characteristics of simple operation, easy control, and strong adaptability, it is widely used in the selection of various manganese ores, and various new coarse, medium, and fine-grained strong magnetic machines have also been successfully developed.
The strong magnetic-flotation method has good adaptability. The strong magnetic separator not only effectively removes the slime, but also improves the selection grade of flotation. Strong magnetic-flotation desulfurization can directly obtain comprehensive manganese concentrate products.Sodium petroleum sulfonate instead of oxidized paraffin soap as collector can make the ore pulp sort at neutral and normal temperature, saving medicine consumption and energy consumption.
Generally, manganese ore leaching methods include direct leaching, roasting leaching and biological leaching. Among them, the direct leaching method includes the hydrosulfite method, sulfur dioxide method, ferrous sulfate method and so on.Taking the leaching method of sulfur dioxide for manganese as an example, the manganese ore is slurried, and sulfur dioxide gas is introduced, and the manganese oxide in the ore is converted into MnSO4 and MnS2O6. Lime milk is added to the filtrate to produce manganese hydroxide precipitation, and solid manganese hydroxide is obtained after filtration. This method is suitable for processing low-grade, inlaid fine-grained manganese oxide ores.
The above are common manganese ore beneficiation methods. In actual production, most of the manganese carbonate ore beneficiation methods use strong magnetic separation, heavy medium beneficiation method and flotation method.The manganese oxide ore is mainly adopts gravity separation method, and the ore washing-heavy separation-reduction roasting-magnetic separation-heavy separation process flow is mostly used. Of course, it is often necessary to combine two or more beneficiation methods for refractory manganese ore.