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

A cathode material, a technology for producing wastewater, which is applied in the fields of water/sewage multi-stage treatment, heating water/sewage treatment, water/sludge/sewage treatment, etc. The effect of high water recovery rate and simple method

Pending Publication Date: 2017-07-18
池州西恩新材料科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

In addition, because it contains a large amount of sodium sulfate, it still cannot meet the emission standards after removing ammonia, and it will cause waste of resources

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Taking a domestic ternary precursor manufacturer with an annual output of 6,000 tons as an example, the wastewater volume is 350m 3 / d. The pollutant concentration test of wastewater discharge is as follows:

[0071] Pollutants pH Na 2 SO 4

NH 3 -N

M 2+

Concentration(g / L) 12.95 100 10.2 0.243

[0072] A treatment system for waste water produced by ternary cathode materials, such as figure 2 As shown, it includes: a membrane separation device 1, which is used to perform membrane separation on the production wastewater of the ternary positive electrode material to obtain deamination wastewater; Inlet, the shell side outlet for discharging the deammonization waste water out of the membrane separation device, the tube side inlet for entering the sulfuric acid into the membrane separation device and the tube side outlet for discharging the ammonium sulfate solution out of the membrane separation device, the membrane separation de...

Embodiment 2

[0080] Taking a domestic ternary precursor manufacturer with an annual output of 10,000 tons as an example, the wastewater volume is 1,000m 3 / d. The pollutant concentration test of wastewater discharge is as follows:

[0081] Pollutants pH Na 2 SO 4

NH 3 -N

M 2+

Concentration(g / L) 11.5 75 4.5 0.07

[0082] For a schematic diagram of the process, see figure 2 . In the figure, the membrane is separated into polytetrafluoroethylene (PTFE) hydrophobic hollow fiber membrane, the operating relative pressure is 0.25MPa, the temperature is 45°C, and the flow rate of dilute sulfuric acid with pH=5 is 3600m 3 / h; the liquid filter is CNII3300 filter, with a single processing capacity of 30m 3 / h, a total of 2 units; the design evaporation capacity of the evaporation and crystallization device is 42t / h, 2 sets are designed, each set is 21t / h, the design temperature difference of the steam compressor is 18°C, and the design temperature rise...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01C1/242C01D5/16
CPCC01C1/242C01D5/16C02F9/00C02F1/04C02F1/001C02F1/44
Inventor 赵志安杨徐烽丁立平吴成陈云
Owner 池州西恩新材料科技有限公司
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