Iron phosphate wastewater treatment method and system

Abstract

The invention relates to the technical field of industrial wastewater treatment, and provides an iron phosphate wastewater treatment method and system. The iron phosphate wastewater treatment method comprises the following steps: S1, pretreating iron phosphate mother liquor to obtain mother liquor clarified filtrate, and pretreating iron phosphate washing water to obtain concentrated water A; s2, mixing the mother liquor clarified filtrate and the concentrated water A, evaporating and concentrating to obtain concentrated water B; s3, the concentrated water B is centrifuged for cooling crystallization, and a solid product is obtained and dried. According to the iron phosphate wastewater treatment method and system provided by the invention, respective treatment is carried out according to the characteristics of iron phosphate production wastewater, and the concentrated water after evaporation and concentration is subjected to operations such as centrifugation, cooling crystallization and drying, so that ammonium sulfate, ammonium hydrogen phosphate, magnesium sulfate and pure water in the wastewater are recycled, and the purposes of resource recovery and zero emission are achieved.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method and system for treating iron phosphate wastewater. Background technique [0002] Iron phosphate is the precursor of lithium iron phosphate, an ideal battery cathode material. With the rapid development of the new energy market, the demand for power batteries, energy storage materials or equipment is increasing, so the demand for iron phosphate is also growing rapidly. Ferric phosphate will go through processes such as synthesis and washing during the production process, and the synthetic mother liquor and washing water produced by it will contain different concentrations of metal ions, sulfate ions (SO 4 2- ), phosphate ion (PO 4 3- ) of high-salt inorganic wastewater, which is difficult to treat, and the discharge of wastewater will cause serious damage and impact on the surrounding environment. [0003] At present, the mainstream methods of...

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Problems solved by technology

[0005] The invention provides a method and system for treating iron phosphate wastewater, which are used to solve the defects of low resource recovery utilization rate, discharge pollution and high investment cost in the treatment of iron phosphate wastewater in the prior art. According to the characteristics of iron phosphate wastewater Carry out separate treatment and recycle ammonium sulfate, ammonium hydrogen phosphate, magnesium sulfate and other substances to achieve the purpose of resource recovery and zero discharge

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