Complex phosphate mineral composition of different types of ore, since the differences in mineralization conditions, and the content of mineral species, disseminated grain size, structure and other structures, and the degree of difficulty selected from other processes are quite different. Phosphate ore is classified into siliceous phosphate rock, calcareous phosphate rock and siliceous calcium phosphate rock according to the chemical composition of minerals. For different ore types, the sorting process is different. At present, the process of sorting phosphate rock applied at home and abroad is relatively perfect, but each has its own advantages and disadvantages. The main common flotation processes include positive flotation process, reverse flotation process, positive and negative flotation combined process and double reverse flotation process.
Flotation process is generally used for sorting low grade phosphate rock, silica and silicon processing including calcium phosphate, calcium and magnesium phosphate quality. The process must have a combination of inhibitory inhibitors to achieve satisfactory results, mainly for the minerals in which the phosphorus minerals and gangue minerals are finely embedded. In recent years, L series and S series high-efficiency inhibitors have been successfully developed, which can obtain better flotation effect on sedimentary metamorphic phosphate rock, but only for ore with low Mg0 content, and direct filtration of products is difficult. It limits the application and promotion of this process in phosphate rock production in China.
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