Some time ago, we talked about several methods of mineral processing (click on the three methods of flotation, magnetic separation and re-election, who is more environmentally friendly and have higher economic benefits?), let's talk about one of them today. Flotation.
Flotation, flotation of flotation is based on the difference in physicochemical properties of mineral particles, according to the difference in mineral floatability. Commonly used flotation agents for flotation are collectors , foaming agents, inhibitors, activators, pH adjusters, dispersants, flocculants, and the like.
working principle
The ore is broken and ground to dissociate various minerals into monomer particles, and the particle size is in accordance with the flotation process requirements. Various flotation agents are added to the milled pulp and stirred and blended to act on mineral particles to expand the difference in floatability between different mineral particles.
The adjusted slurry is sent to the flotation tank and stirred for aeration. The ore particles in the slurry contact and collide with the bubbles, and the floatable particles selectively adhere to the bubbles and are carried to rise into a mineralized foam layer composed of gas-liquid-solid three-phase, mechanically scraped or The slurry surface overflows, then dehydrates and dries into a concentrate product. Mineral particles such as gangue that cannot be floated are positively floated as the slurry is discharged from the bottom of the flotation tank as a tailings product.
Sometimes, the unwanted floating mineral particles, mineral particles remain in a useful pulp, called reverse flotation, such as quartz emerges from iron ore and the like.
In principle, flotation is a mineral that floats up and is low in float.
At the technical level, almost all minerals can be separated from the ore by flotation, and then economic feasibility is considered.
Application range
Flotation is the most important technology in resource processing technology. Its application prospect is extremely broad. Almost all minerals can be separated from ore by flotation, and can process secondary resources and non-mineral resources, such as metals and non-metallic mineral sorting, waste water treatment, bacteria separation.
With the continuous development of flotation, at present, flotation is not limited to the metallurgical mining industry, and has broad application prospects in chemical, paper, food, agriculture, medicine, industrial waste, and wastewater treatment.
Advantages and disadvantages
-Advantage-
1) Wide application range and adaptability. It can be applied to various mineral sectors such as non-ferrous metals, rare metals and non-metals, and has been widely used in chemical, building materials, environmental protection, agriculture, medicine and other fields.
2) High sorting efficiency, suitable for processing minerals with low grade and fine embedded.
3) Conducive to the comprehensive recovery of mineral resources. The coarse concentrate, medium ore or tailings obtained by other beneficiation methods can be further processed to improve the concentrate grade, recovery rate and comprehensive recovery of useful components therein.
4) Fine particle size: It is especially effective to treat fine-grained minerals.
- disadvantage -
1) The use of various types of chemicals is likely to cause environmental pollution, and purification treatment facilities are required.
2) A finer grinding size is required.
3) High cost, many influencing factors and high process requirements.
As one of the most popular beneficiation methods, the application field of flotation is expanding. It is believed that with the development of technology, the future flotation process will overcome the existing deficiencies and become more and more perfect.
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