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Yufu Phosphate Fertilizer Plant treats muddy sewage, realizes separation of sludge and sewage, reduces the pressure of phosphorus gypsum slag, and finally achieves significant progress in the project of zero discharge of sewage, after completing the preliminary test of the purification and reuse of muddy sewage. The fully-started pilot-scale processing system has enabled the treated sewage to reach the standard for the use of system equipment. The amount of slag produced from sewage increased from the original 16 tons per hour to 32 tons, and the amount of mud entering the slag yard was reduced to 60 cubic meters per hour, and economic loss of 590,000 yuan was avoided every year.