Method for producing lithium phosphate by using lithium-containing waste liquid

The present invention relates to a process for the production of lithium-containing waste liquid lithium phosphate, comprises the steps of: phosphoric acid molar ratio of 3 Industrial lithium-containing waste liquid and the lithium phosphate content: amount (1-1.05) was added lithium-containing waste reaction at a temperature of 70-90 deg.] C 1-5h, after sufficient reaction was filtered, the filter cake was washed with drying to obtain lithium phosphate products. The method of the present invention has the following significant advantages: the use of different solubility products of the waste in a reasonable conversion of the lithium phosphate is lithium resource high added value, following the principle of circular economy "3R", saving the corresponding lithium resources; conversion rate of the present invention, sufficient lithium resource utilization, production cost savings corresponding lithium products; in addition, the inventive process is simple, easy to operate, easy industrial production; the present invention is a lithium-containing effluent discharge standards fully utilized, achieve the purpose of cleaner production.