The method of production of high-grade phosphate rock using WPA

The present invention discloses a method for the production of high-grade phosphate rock using WPA species belonging phosphorus chemical processing field, the process is two-step reaction, the countercurrent washing procedure, a high-grade phosphate rock to produce high concentrations of phosphoric acid and technical grade plaster, comprising the steps of: a pressurized acid hydrolysis reaction step, the acid hydrolyzate separation step, the reaction step and serum calcium Shen washing liquid recycling step. The method of the present invention is able to phosphorus element in the production of high-grade phosphate rock to a high concentration of phosphoric acid at the same time, it is also capable of producing calcium phosphate into industrial grade plaster, to achieve the purpose of energy saving and the value of the calcium.