2 results about "Fluorapatite" patented technology

Efficiently reduces fluorine in fluorine-containing wastewater. [Solution] A method for treating wastewater containing fluorine, comprising the steps of: adjusting the pH of the wastewater containing fluorine to 10-11; adding a phosphate-based agent to the wastewater whose pH has been adjusted; and adjusting the pH of the wastewater to which the phosphate-based agent has been added to 10-11 and removing the fluorine in the wastewater as fluoroapatite.

The application belongs to the technical field of phosphogypsum resource utilization, and particularly relates to a method for directionally recovering fluorapatite from phosphogypsum leaching solution. The method comprises the following steps: performing rough filtration and flocculation pretreatment on the phosphogypsum leaching solution to remove suspended solid matters; then adding an alkaline precipitant to adjust the pH to 6-12 to remove precipitates; then adding a Ca source according to a Ca:P:F molar ratio of (4.8-5.2):(2.8-3.2):(0.8-1.2), or simultaneously adding the Ca source and a P or F source, adjusting the pH to a favorable crystallization interval of 7-9, introducing fluorapatite crystal seeds to stir and crystallize or to stir and crystallize by cooling, and performing solid-liquid separation, so that the obtained solid phase is Ca5(PO4)3F. Through specific synergistic regulation, conditioning, adjustment and induced crystallization process, the method can directionally recover high-purity fluorapatite from the phosphogypsum leaching solution.