Технологические подходы к получению фосфорсодержащих продуктов на основе экстракционной фосфорной кислоты

Abstract

The article systematizes technological solutions related to the concentration of wet-process phosphoric acid and its subsequent use for the synthesis of phosphorus-containing materials. It reviews the results of studies on the evaporation of wet-process phosphoric acid desulfated with SrCO₃, as well as on the production of dicalcium phosphate and tricalcium phosphate through the reaction of phosphoric acid with calcium carbonate. Controlling the acid concentration is shown to be an essential step in preparing the raw material. Analysis of published data made it possible to identify the conditions under which calcium phosphate products with a high content of available phosphorus and calcium compounds are formed. For dicalcium phosphate, the most effective combination of parameters was 50.58% P₂O₅ and an acid rate of 95% of the stoichiometric amount. For tricalcium phosphate, the same acid concentration was combined with a rate of 100% of the stoichiometric amount. The resulting materials met the requirements of GOST 23999-80 and are considered potential phosphate additives for agricultural use.