Device and method of preparing pure lithium chloride solution by precipitating sodium through evaporation of mixed aqueous solution of lithium chloride and sodium chloride

A technology of pure lithium chloride and lithium chloride, applied in the direction of lithium halide, alkali metal chloride, etc., can solve the problems of poor product quality, high operating cost, and low recovery rate of lithium chloride, and achieve easy cleaning and low operating cost The effect of low cost and easy operation of the equipment

Active Publication Date: 2017-02-08
河北言明化工设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process has problems such as high operating cost, low recovery rate of lithium chloride, and poor product quality.

Method used

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  • Device and method of preparing pure lithium chloride solution by precipitating sodium through evaporation of mixed aqueous solution of lithium chloride and sodium chloride

Examples

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Effect test

Embodiment 1

[0029] A device for producing pure lithium chloride solution by evaporating sodium chloride mixed aqueous solution of lithium chloride and sodium chloride, see figure 1 As shown, it includes a condensed water preheater 1, an evaporation crystallizer, a thickener 2, a centrifuge 3, a mother liquor tank 4, a mother liquor pump 5, a lithium chloride clear liquid tank 6, an indirect condenser 7 and a condensed water tank 8.

[0030] The evaporation crystallizer is a double-effect forced circulation evaporation crystallizer. The double-effect forced circulation evaporation crystallizer includes a first-effect evaporator, a first-effect crystallizer 22, a second-effect evaporator and a second-effect crystallizer 23. The first-effect evaporator includes a first-effect heating chamber 24 and a first-effect circulation pump 25, and the second-effect evaporator includes a second-effect heating chamber 26 and a second-effect circulation pump 27.

[0031]The condensed water preheater 1 is...

Embodiment 2

[0040] A device for producing pure lithium chloride solution by evaporating sodium chloride mixed aqueous solution of lithium chloride and sodium chloride, including condensate water preheater 1, evaporation crystallizer, thickener 2, centrifuge 3, mother liquor tank 4, mother liquor pump 5. Lithium chloride clear liquid tank 6, indirect condenser 7 and condensed water tank 8.

[0041] The condensed water preheater 1 is provided with a raw material inlet 9, a raw material outlet 10, a condensed water inlet 11 and a first condensed water outlet 12; the raw material outlet 10 of the condensed water preheater 1 is connected to the raw material inlet of the evaporation crystallizer through a pipeline , the raw material outlet of the evaporation crystallizer is connected with the feed port of the thickener 2 through a pipeline; the slurry outlet at the lower part of the thickener 2 is connected with the centrifuge 3, and the centrifuge mother liquor outlet of the centrifuge 3 is con...

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Abstract

The invention discloses a device and a method of preparing pure lithium chloride solution by precipitating sodium through evaporation of a mixed aqueous solution of lithium chloride and sodium chloride and relates to the technical field of lithium chloride production. A raw material outlet of a condensate preheater is connected with a raw material inlet of an evaporation crystallizer through a pipeline; a raw material outlet of the evaporation crystallizer is connected with a feeding hole of a thickener through a pipeline; a lower part slurry outlet of the thickener is connected with a centrifugal machine; a centrifugal mother liquid outlet of the centrifugal machine is connected with a mother liquid groove; the mother liquid groove is connected with a mother liquid return hole of the evaporation crystallizer through a mother liquid pump; a sodium chloride crystal outlet is also formed in the centrifugal machine; and an upper part clear liquid outlet of the thickener is connected with a lithium chloride clear liquid groove. According to the device and the method, separation of the lithium chloride and the sodium chloride is more efficient, the purity of the obtained lithium chloride solution is high, and the sodium content is low; the equipment is simple and convenient to operate, low in running cost and little in investment and is feasible; and in addition, without using an external solution, new impurities are not introduced in the whole process, no waste liquid is drained, and environmental effect and economic benefit are good.

Description

technical field [0001] The invention relates to the technical field of lithium chloride production. Background technique [0002] In the production process of lithium chloride as polyphenylene sulfide catalyst and metal lithium as butyllithium or other pharmaceutical products, lithium-containing wastewater will be generated, and lithium-containing wastewater can be treated to obtain pure mixed aqueous solution of lithium chloride and sodium chloride . [0003] The original separation and treatment process of lithium chloride and sodium chloride in the mixed aqueous solution of lithium chloride and sodium chloride is to add soda ash to precipitate lithium chloride into lithium carbonate, and then filter and separate to obtain lithium carbonate products with higher impurity content. This process has problems such as high operating cost, low recovery rate of lithium chloride, and poor product quality. [0004] In the process of producing lithium chloride from salt brine, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/04C01D3/04
CPCC01D3/04C01D15/04
Inventor 徐彦国韩涛
Owner 河北言明化工设备有限公司
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