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Method for treating high-salinity lithium-containing wastewater generated in lithium battery precursor preparation

A wastewater treatment and high-salt wastewater technology, applied in water/sewage treatment, heating water/sewage treatment, water/sludge/sewage treatment, etc., can solve high energy consumption, low efficiency, easy to block evaporator tubes, etc. problems, to achieve the effect of increasing recovery rate, reducing impact and prolonging cleaning cycle

Inactive Publication Date: 2017-06-13
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the multi-effect evaporation technology only used for lithium-containing high-salt wastewater treatment process has high energy consumption, low efficiency, and inherent properties of lithium-containing wastewater (lithium carbonate solution is not easy to clean after heating, and it is easy to block the evaporator column. Tube) Disadvantages

Method used

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  • Method for treating high-salinity lithium-containing wastewater generated in lithium battery precursor preparation
  • Method for treating high-salinity lithium-containing wastewater generated in lithium battery precursor preparation
  • Method for treating high-salinity lithium-containing wastewater generated in lithium battery precursor preparation

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Embodiment

[0034] In this design, the lithium-containing high-salt wastewater discharged by an enterprise with an annual production of lithium carbonate and lithium hydroxide totaling 3,000 tons in a city in the northwest is used as the treatment object. The physical index of lithium-containing wastewater is pH=10-13, and the specific gravity is 1.05-1.10. , COD>2000, solid content<2%. The main components of wastewater are shown in Table 1.

[0035] Table 1. Lithium-containing high-salt wastewater composition list (g / L)

[0036]

[0037] The specific implementation steps are: (1) Negative-pressure evaporation of lithium-containing high-salt wastewater; (2) Recycling of negative-pressure low-temperature saturated steam through the MVR two-stage compressor after secondary heating; (3) Separation of high-temperature insoluble high-grade lithium salt; (4) Separation of crystalline sodium and potassium salts; (5) Separation and recovery of low-grade lithium salts and sodium and potassium ...

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Abstract

A method for treating high-salinity lithium-containing wastewater generated in lithium battery precursor preparation includes steps: (1) negative-pressure evaporation of high-salinity lithium-containing wastewater; (2) recycling of negative-pressure low-temperature saturated steam after secondary heating through an MVR (mechanical vapor recompression) two-stage compressor; (3) separation of high-temperature insoluble high-grade lithium carbonate; (4) fractional crystallization of sodium potassium salts; (5) separation and recovery of low-grade lithium salts and sodium potassium salts. By application of an evaporator and an MVR system for substitution of a traditional tubular multi-effect evaporator, energy consumption in wastewater treatment is reduced remarkably, the problem of discharge of production wastewater in the lithium industry is effectively solved while the valuable lithium product recovery rate is greatly increased, and environmental and enterprise production benefits are remarkable.

Description

technical field [0001] This application involves the production technology of lithium salt materials for lithium batteries, specifically the low-energy and zero-emission technology of carbonate-type lithium-containing high-salt wastewater. Background technique [0002] As a relatively clean energy, lithium battery has become an important energy industry product. However, in the production of raw materials for industrial lithium batteries, a large amount of lithium-containing high-salt wastewater will be produced, and the main components are lithium, sodium, potassium, chloride ions, sulfate ions, etc. These lithium-containing high-salt wastewater has complex components, poor biodegradability, and COD seriously exceeds the standard. In addition to corroding pipelines and equipment, it will impact the sewage biochemical treatment system and will directly affect the further reuse of reclaimed water and the ecological environment of water bodies. On the other hand, under the st...

Claims

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Application Information

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IPC IPC(8): C02F1/04C01D15/08
CPCC01D15/08C02F1/048
Inventor 戴剑锋刘骥飞黄良标彭万通王青
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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