Treatment method and treatment system for ternary positive electrode material production wastewater

Abstract

The invention relates to a treatment method and treatment system for ternary positive electrode material production wastewater. According to the treatment method, a technological process of combining film separation, solid-liquid separation and evaporative crystallization is adopted for the first time: firstly, a sulfuric acid solution is taken as an absorbent and ammonia nitrogen in the wastewater is converted into ammonium sulfate by adopting film separation to achieve deamination; since the pH at an earlier stage is alkaline, a lot of metals in the wastewater are broken after deamination and form sediments together with alkali, and heavy metal sediments in the solution are filtered and removed; and supernate is subjected to evaporative crystallization to obtain sodium sulfate after filtration. According to the treatment method, ternary positive electrode material production wastewater is subjected to advanced treatment and reuse, so that the problem of treatment of the ternary positive electrode material production wastewater is effectively solved, ammonia, heavy metal and sodium sulfate resources in the wastewater are recovered, the water recovery rate is high and zero emission is achieved.

Description

technical field

[0001] The invention belongs to the technical field of wastewater advanced treatment, and in particular relates to a treatment method and a treatment system for wastewater produced by ternary cathode materials. Background technique

[0002] With the gradual reduction of petroleum resources and the huge environmental pollution caused by traditional energy sources, the development of renewable green energy and energy storage materials has become an important direction of global development. Lithium-ion secondary batteries have the advantages of high energy density, stable working performance, and light weight, and are the focus of high-power power battery development.

[0003] At present, the successfully commercialized lithium ion battery cathode materials include lithium cobaltate, lithium manganate and lithium iron phosphate. Lithium cobalt oxide and lithium manganese oxide have small discharge specific capacity and poor chemical stability, so they are diff...

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