In industry, the main phosphate mineral extracted from phosphorus is apatite, followed by sulfur, phosphorus, aluminum strontium, struvite and bluestone.
About 95% of the phosphorus in nature is concentrated in apatite.
Using different surface properties of phosphate minerals and impurity minerals, flotation agents are used to float phosphate minerals to achieve separation. This operation is called positive flotation.
The other is to float an impurity mineral and sink a phosphate mineral, called reverse flotation.
In order to make the separation more effective, it is often necessary to add inhibitors to inhibit the rise of certain minerals.
Concentrate can be obtained by thickening, filtering and dewatering the pulp containing phosphate from the flotation machine.
What is Phosphate Rock Processing?
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Phosphate ore has no fixed molecular formula and fixed crystal structure. It belongs to noncrystalline. Phosphate usually shows oolitic structure, sometimes binding, globular and power shapes and so on. It is a kind of fine dispersed phase apatite with colloidal structure which is difficult to process.
Phosphorite ore beneficiation processes involves in all ore dressing methods which include Scrubbing and removing mud, flotation method, roasting and digestion method, heavy medium separation method, photoelectric mineral processing method, biological treatment method and combined mineral processing technology.
Crubbing and removing mud of phosphorite ore beneficiation processes has been mature. But the practice shows that it is limited in improving the grade of phosphorite and a large of tailing produced has not been taken advantage of. At present, this method is combined with flotation and the phosphorite among the tailing can be recovered by the flotation method.
The flotation method is widely suitable among all the phosphorite ore beneficiation processes. By the different nature of phosphorite, it can be divided into positive flotation, flotation (positive and negative), double reverse flotation.
Roasting and digestion method of phosphorite ore beneficiation processes is mainly used in the carbonate phosphorite rock. It has many features such as simple process, fine index, professional operation process and high roasting energy saving.
Heavy medium separation method of phosphorite ore beneficiation processes has such advantages as simple process, low cost, easy operation and less pollution ans so on. But the fine particles are difficult to recover, so this method is usually used as the pre-election process for phosphorite ore.
The principle of photoelectric mineral processing of phosphorite ore beneficiation process is based on the difference of the useful minerals and gangue minerals to separate. It has many advantages such as no waste water and environmental pollution, simple structure of equipment, easy maintenance and low cost. But it has high requirement for the water content of the feeding material.
The principle of biological treatment of phosphorite ore beneficiation process is taking advantage of the microorganism growing in the phosphorite ore and producing sulfuric acid to dissolve the phosphorite ore. It has many advantages as low costs and lean ore processing and so on. But it need long time to leach the concentration.
Combined mineral processing technology phosphorite ore beneficiation process has strong pertinence. It can simplify the processes and reduce the energy consumption, reagent consumption and recover the associated metal. It is the trend of the phosphorite ore beneficiation process.