Method for zero-discharging treatment of ternary material cleaning wastewater

Abstract

The invention discloses a method for zero-discharging treatment of ternary material cleaning wastewater. A technical process of combination of a ceramic membrane treatment system, an electrodialysis treatment system, a RO reverse osmosis system, an MVR evaporative crystallization system and a lithium carbonate recovery system is adopted. The method includes steps: (1) filtering out suspended solids in the ternary material cleaning wastewater through the ceramic micro-filtration membrane treatment system, and recovery solid oxides in the wastewater; (2) feeding the wastewater filtered through aceramic micro-filtration membrane into a coagulative precipitation tank; (3) subjecting effluent of the coagulative precipitation tank to concentration treatment through the electrodialysis treatmentsystem; (4) enabling electrodialysis produced water to flow into the RO reverse osmosis system, wherein produced water of the RO reverse osmosis system reaches recycled water standards, and RO concentrated water returns to electrodialysis inflow and is subjected to concentration treatment again; (5) adding an appropriate amount of saturated sodium carbonate solution into electrodialysis concentrated water to realize crystallizing separation of lithium carbonate, adopting a centrifuge for lithium carbonate solid-liquid separation, and finally drying; (6) feeding mother liquor obtained after lithium carbonate recovery into the MVR evaporation system.

Description

technical field [0001] The invention relates to the technical field of environmental protection facilities, in particular to a zero-discharge treatment method for ternary material cleaning wastewater. Background technique [0002] With the continuous consumption of the earth's resources, traditional petroleum resources have also brought challenges to the living environment of human beings, and the development of renewable green energy is imminent. At present, energy storage materials are widely concerned by scientists and entrepreneurs. Among them, the superior performance of lithium-ion batteries is currently the key object of high-power power battery development. [0003] There are many positive electrode materials for successful commercialization of lithium-ion batteries, and the representative ones are lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate. Lithium cobalt oxide and lithium manganese oxide have small discharge specific capacity and po...

AI Technical Summary

Problems solved by technology

The chemical co-precipitation method will produce a large amount of alkaline wastewater, high ammonia nitrogen and heavy metal complexes in the washing and separation process. In addition, the cleaning water contains a large amount of sodium sulfate salt. After ammonia nitrogen treatment, it still cannot meet the discharge standards, and wastes resources.

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