Method for preparing anhydrous lithium chloride by lithium-containing liquid waste

A lithium chloride and waste liquid technology, applied in lithium halide and other directions, can solve the problems of difficult separation of sodium and potassium impurities, unreasonable economy, and high raw material cost, and achieve the effects of low raw material cost, simple process and high lithium recovery rate.

Active Publication Date: 2016-08-10
天齐锂业(江苏)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter which of the above methods, there are problems of high raw material cost and difficult separation of impurity sodium and potassium. Alth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054] Take lithium-containing waste liquid 500mL, wherein, this lithium-containing waste liquid is the lithium-containing waste liquid that produces in the production process of pharmaceutical intermediates, and the lithium ion concentration in this lithium-containing waste liquid is 25g / L, and the chloride ion concentration is 150g / L, sodium ion concentration 10g / L, sulfate ion concentration 3g / L, magnesium ion concentration 0.1g / L, calcium ion concentration 0.2g / L, potassium ion concentration 0.01g / L.

[0055] Adding mass concentration to the above-mentioned lithium-containing waste liquid is 10% hydrogen peroxide and stirring and reacting at normal temperature for 20 minutes; then adding a barium chloride solution with a concentration of 50 g / L, stirring to precipitate sulfate ions, and filtering to obtain the mother liquor; Add a sodium carbonate solution with a concentration of 150g / L to the mother liquor, stir and react at 30°C for 50 minutes, filter to remove traces of...

example 2

[0057] Take lithium-containing waste liquid 500mL, wherein, this lithium-containing waste liquid is the lithium-containing waste liquid that produces in the production process of pharmaceutical intermediates, and the lithium ion concentration in this lithium-containing waste liquid is 30g / L, and the chloride ion concentration is 120g / L, sodium ion concentration 8g / L, sulfate ion concentration 4g / L, magnesium ion concentration 2g / L, calcium ion concentration 0.5g / L, potassium ion concentration 0.1g / L.

[0058] Adding mass concentration to the above-mentioned lithium-containing waste liquid is 50% hydrogen peroxide and stirring and reacting at normal temperature for 50 minutes; then adding a barium chloride solution with a concentration of 200g / L, stirring to precipitate sulfate ions, and filtering to obtain the mother liquor; Add a sodium carbonate solution with a concentration of 130g / L to the mother liquor, stir and react at 60°C for 120min, filter to remove traces of calcium...

example 3

[0060] Take lithium-containing waste liquid 500mL, wherein, this lithium-containing waste liquid is the lithium-containing waste liquid that produces in the production process of pharmaceutical intermediates, and the lithium ion concentration in this lithium-containing waste liquid is 20g / L, and the chloride ion concentration is 100g / L, sodium ion concentration 12g / L, sulfate ion concentration 2g / L, magnesium ion concentration 0.5g / L, calcium ion concentration 4g / L, potassium ion concentration 0.2g / L.

[0061] In the above-mentioned lithium-containing waste liquid, add hydrogen peroxide with a mass concentration of 30% and stir and react at normal temperature for 50 minutes; then add a barium chloride solution with a concentration of 100g / L, stir to precipitate sulfate ions, and filter to obtain the mother liquor; Add a sodium carbonate solution with a concentration of 160g / L to the mother liquor, and stir and react at 40°C for 240 minutes, filter to remove traces of calcium i...

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PUM

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Abstract

The invention discloses a method for preparing anhydrous lithium chloride by lithium-containing liquid waste. The lithium-containing liquid waste at least contains lithium ions, calcium ions, magnesium ions, sodium ions, potassium ions, sulfate ions and chloride ions. The method comprises the following steps of: (A) adding hydrogen peroxide to the lithium-containing liquid waste. To remove a residual organic phase; (B) adding a barium chloride solution and filtering the solution after reacting to obtain a mother liquid; (C) adding a sodium carbonate solution to the mother liquid and filtering the solution after reacting to obtain a refined mother liquid; (D) evaporating and concentrating the refined mother liquid until sodium chloride and potassium chloride solids are separated out, carrying out filtration to remove the sodium chloride and potassium chloride solids to obtain a lithium chloride clean liquid; (E) adding a sodium refining agent to the lithium chloride clean liquid, carrying out stirred reaction and then filtering the solution to obtain a high-concentrate lithium chloride solution; and (F) drying the high-concentrate lithium chloride solution and then obtaining anhydrous lithium chloride. The method is simple in technology, low in production cost, high in lithium recovery rate and friendly to environment.

Description

technical field [0001] The invention relates to the technical field of lithium chloride preparation, and more specifically, relates to a method for preparing anhydrous lithium chloride by utilizing lithium-containing waste liquid. Background technique [0002] Lithium chloride is an important lithium salt product. In recent years, it has been widely used as a mutagen in industries such as medicine, food, and environmental protection. It can be used to cultivate high-yield strains, synthesize pharmaceutical intermediates, and genetically modify strains. It can also be used for the separation and extraction of RNA and the extraction and purification of a small amount of plasmid DNA; in terms of organic structure analysis, it is also an important cationic additive; in medicine, it can be used to treat diabetes and apply to genetic research, etc.; in new In the field of materials, it can be applied to the production of chitin. In addition, electrolytic production of metallic li...

Claims

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Application Information

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IPC IPC(8): C01D15/04
CPCC01D15/04
Inventor 曹乃珍高洁肇巍樊平张炳元杜明泽赵莉
Owner 天齐锂业(江苏)有限公司
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