METHOD OF PHOSPHATE ORE PROCESSING Russian patent published in 2009 - IPC C01B25/22 C01B25/32 

FIELD: chemistry.

SUBSTANCE: method of phosphate ore processing includes one-step counterflow process of phosphate ore decomposition, characterised by P₂O₅ content exceeding 20% in weight, by processing it with water solution of hydrochloric acid, which has HCl concentration lower than 10% in weight, with formation of processing solution, consisting of water phase, in which calcium phosphate is in dissolved state, and of solid phase, which contains admixtures; preliminary neutralisation of processing solution, containing calcium phosphate in solution, to first pH value, which is lower than pH value, at which essential part of said dissolved calcium phosphate precipitates in form of calcium monohydrophosphate (DCP), with precipitation of admixtures; first separation of insoluble solid phase and water phase of processing solution; repeated neutralisation of water phase obtained during first separation to second pH value, exceeding said first pH value, with DCP precipitation; and second separation of repeatedly neutralised water medium, which represents water solution of calcium chloride and precipitated DCP.

EFFECT: method allows optimising ratio between dissolved P₂O₅ output and purity degree of final product and ensure economically profitable process, which can be realised on simple equipment.

14 cl, 3 dwg, 2 tbl, 1 ex