Closed cyclic utilization method for production water of monoammonium phosphate

Abstract

A closed cyclic utilization method for production water of monoammonium phosphate, is suitable for a dihydrate pulp wet-process phosphoric acid technology and an ammonia neutralization fluidized drying phosphate fertilizer production system. A production water cyclic system mainly comprises a clear water recovery pond, a sewage settling basin, a settlement and overflow groove, a water flushing and distribution tank, a thick slurry groove, a round plate filter, an extraction tail gas washing tower, a dried tail gas washing tower. Multi stage closed cyclic utilization is preformed on sewage, and primary water consumed by per ton product is 2.5-2.8t, in order to supplement water entering into the product or phosphogypsum and lost by evaporation. The method provided by the invention resolves problems of a lot of sewage and difficult treatment, which puzzles a monoammonium phosphate production enterprise for a long time. The method has advantages of simple technology process, good sewage treating effect, small technology equipment and investment, low personnel labor intensity and high water utilization rate. The method can effectively save water resource, the water consumption of monoammonium phosphate product is reduced to 2.5-2.8t per ton product from 20t per ton product. The method implements closed cyclic utilization for production water of monoammonium phosphate, and zero discharge of sewage.

Description

technical field [0001] The invention relates to the technical field of monoammonium phosphate production, in particular to a method for closed recycling of monoammonium phosphate production water. Background technique [0002] At present, the fluorine-containing sewage, dust-containing sewage, maintenance sewage, and condensed water from the II-effect flash chamber produced by the production of monoammonium phosphate are directly discharged to the sewage treatment station, and then discharged after comprehensive treatment with lime; while vacuum pumps, slurry pumps, Thick slurry pump, sewage pump, filtrate pump, cooling water tower pump, blower and other cooling water for ammonium phosphate equipment, water for washing the tail gas of the extraction tank, water for washing the disc filter, water for washing the tail gas of the drying tower, etc. Both use primary water, and the water consumption per ton of monoammonium phosphate production is generally about 20 tons. [0003...

AI Technical Summary

Problems solved by technology

[0004] 1. The water consumption of monoammonium phosphate production is high, and the utilization rate of water resources is low;

[0005] 2. The production sewage is directly discharged to the sewage treatment station, which is discharged after comprehensive treatment with lime, and the sewage discharge volume is large, which cannot meet the technical requirements of environmental protection for water quality;

[0006] 3. The cost of sewage treatment is high, and phosphorus and water resources are seriously wasted

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