SPECIFICITIES OF THE RECIRCULATING METHOD FOR CENTRAL KYZYL KUM PHOSPHORITES PROCESSING TO QUALIFIED PHOSPHORIC FERTILIZERS

With the purpose of obtaining concentrated grades of phosphoric fertilizers, the decomposition of phosphorus concentrate from phosphorites of the Central Kyzyl Kum with evaporated wet processing with phosphoric acid by the recirculating method in liquid phase, has been investigated. The results of the research have shown, that the expansion coefficient of the phosphorus concentrate is 83,34 - 90,29 %. In addition the filtration rate by liquid phase has been found. The degree of distribution of the phosphate constituent parts components has been given. The process of neutralization of the acid monocalcium phosphate, obtained from phosphorus concentrate with a 25 % water solution of ammonia (NH 3 ) and limestone (СаСО 3 ), has been studied. Products, containing 53,01 - 55,36 and 50,51 - 51,19 % Р 2 О 5 with 4,13 and 1,92 МPа static strength, respectively, have been obtained. The latter can be recommended as a double superphosphate by the State Standard grade A.

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