The actual beneficiation processes adopted are deter.mined by the nature and physical properties of ores and gangue minerals,their mde of association with each otherthe method of exploiting the deposit and the end.use of thebeneficiated product,In small-scale mining operat ions,selective mining is supplemented by hand sorting wherebyferruginous or siliceous impurities like laterite,quartzetc,are separated from bauxite with the help of megascopiccharacteristics like colour,texture, specific gravity, etc.In large-scale mechanised mining, the upgradation of r o,meore by simple manual dressing,sorting,screening and washingis not practicable,In such cases,mechan ical beneficiationof the r,o,m,bauxite becomes inevitable particularly whenthe ore bly is mixed up with deleterious constituents. Themechan ical benefic iation methods for upgrading such bauxitecan only be effective if the impurities are easily liberatedfrom the ore by comminution,Metallurgical grade bauxitesare beneficiated by mechanical screening and washing.
1. Feeding
Feeding is continuously and evenly feeding processed or unprocessed materials from specific equipment (hopper, storage bin, etc.) to the receiving equipment or transportation machinery.
Several standard feeders: trough feeders, disc feeders, pendulum feeders, vibrating feeders, and electromagnetic vibrating feeders.
2. Crushing
Crushing is the process of crushing a large piece of ore or ore to be processed, with the help of external force, to overcome the force between its internal molecules, so that the particle size of the ore is gradually reduced.
There are many crushers, such as jaw crushers, impact crushers, vertical impact crushers, hydraulic cone crushers, ring hammer crushers, hammer crushers, roll crushers, compound crushers, Cone Crusher, Double-stage Crusher, Gyratory Crusher, Mobile Crusher, etc.
3. Grinding
The crushed ore is further crushed into materials with smaller particle sizes.
A ball mill is a commonly used crushing equipment, divided into cement ball mill, tubular ball mill, ultra-fine lamination mill, conical ball mill, ceramic ball mill, intermittent ball mill, overflow ball mill, lattice ball mill, wind discharge ball mill, double warehouse ball mill, energy-saving ball mill, and other types.
4. Grinding
According to the principle that solid particles have different settling velocities in the medium due to different particle sizes, the particle group is divided into two or more particle size levels.
Classification equipment includes two types: screening and grading equipment, standard high-frequency vibrating fine screens, screening machines, electromagnetic high-frequency vibrating screens, hydraulic grading equipment, common pyramid pools, inclined plate (inclined tube) grading equipment, and hydraulic Cyclone. Classification equipment often forms a closed-circuit process with a ball mill.
5. Mineral Dressing
The main beneficiation methods of bauxite are ore washing, flotation, magnetic separation, chemical, and physical beneficiation, etc. These methods are usually used in combination.
Ore washing: Using the principle of gravity physics, the aluminum-silicon ratio of loose aluminum ore is more than doubled.
Commonly used equipment: Hydraulic washing screen, cylindrical washing machine, trough machine, vibrating screen machine, etc.
Flotation: It is a standard method in various beneficiation processes. It is mainly used to separate diaspore and kaolinite, and alkaline substances are added to the flotation machine as a medium.
Commonly used equipment: Mechanical stirring flotation machine, flotation machine, flotation column, flotation bed, etc.
Magnetic separation: A magnetic separator separates iron impurities in aluminum ore.
Commonly used equipment: Permanent magnet magnetic separator, electromagnetic magnetic separator, etc.
Chemical and physical methods: Mainly roasting desiliconization, this method is mainly based on hydrous aluminum band silicate in minerals, as a result, part of the silica can be converted into tailings that are amorphous and easy to-enter alkaline silica particles, So as to achieve the purpose of increasing the ratio of aluminum to silicon.
Common roasting equipment: Shaft furnace, fluidized fluid bed furnace, rotary kiln, etc.
Bauxite concentrate can be obtained through the above processing process, and the bauxite concentrate is used to produce alumina, and the obtained alumina can be made into alumina.
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Mineral Processing Plant Bauxite Beneficiation & Tailings Reprocessing Process Images
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