Ferric phosphate wastewater treatment and reuse device and treatment and reuse method thereof

Abstract

The invention relates to an iron phosphate wastewater treatment and recycling device and method. The device structurally comprises an adjusting tank T0 for primary washing and secondary washing water of iron phosphate, a recycled concentrated water tank T1, a tubular filter membrane device DF, a filter press device PF, a filtering water tank T2, a primary reverse osmosis device RO1, a primary reverse-osmosis concentrated water tank T3, a concentrated water reverse osmosis device RO3, a concentrated water reverse-osmosis production water tank T4, a secondary reverse osmosis device RO2 and a secondary reverse-osmosis production water tank T5. The treatment and recycling method comprises steps as follows: pH (potential of hydrogen) is increased by adding liquid ammonia, trace heavy metal is circularly filtered out through tubular membrane filtering, and filter-press sludge is transported outwards; high-purity production water generated through concentration and purification of filtrate obtained after tubular membrane filtering is taken as pure production water to be recycled; a mother solution and a concentrated solution are mixed and subjected to evaporative crystallization treatment, and ammonium sulphate and ammonium phosphate are produced. The iron phosphate wastewater treatment and recycling device and method have the advantages as follows: pollution is eliminated, water is saved, and raw materials of a compound fertilizer are recycled.

Description

technical field [0001] The invention relates to an iron phosphate wastewater treatment and reuse device and a treatment and reuse method thereof, belonging to the technical field of industrial wastewater treatment. Background technique [0002] Iron phosphate is the precursor of lithium iron phosphate, a battery cathode material. During the production process of iron phosphate, it will go through processes such as synthesis, first washing, aging, and second washing. The resulting synthesis and aging mother liquor is a high concentration of ammonia nitrogen (NH 3 -N), sulfate (SO 4 2- ), total phosphorus (TP) acidic inorganic wastewater, the first and second washing water also contain some ammonia nitrogen (NH 3 -N), sulfate (SO 4 2- ), total phosphorus (TP). The current treatment method is mainly to use lime to remove total phosphorus and discharge at a low standard, which not only produces a large amount of sludge which is difficult to handle, but also causes pollution...

AI Technical Summary

Problems solved by technology

While solving the pollution problem of iron phosphate wastewater, water resources are reused, and the active ingredients in the water are recovered, achieving better social and economic benefits

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