Experimental study on recovery of water-soluble phosphorus from phosphogypsum
The by-product phosphogypsum of wet-process phosphoric acid contains water-soluble phosphorus.Direct stacking of phosphogypsum will cause waste of phosphorus resources and lead to water pollution.Water washing and calcium oxide precipitation method are used to recover water-soluble phosphorus,the effects of water consumption and temperature on the recovery rate of water-soluble phosphorus,and the effect of calcium oxide addition on the recovery rate of phosphorus in washing solution are studied.The results show that under the conditions of 40 ℃,liquid-solid ratio of 0.7 mL/g,stirring time of 30 minutes,and stirring speed of 400 r/min,more than 80％of water-soluble phosphorus enters the liquid.The water-soluble phosphorus in the washing solution can be precipitated with calcium oxide.Through water washing and mineralization,the recovery rate of water-soluble phosphorus from phosphogypsum achieves 80％,which has significant economic value.
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