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Method of producing high-purity anhydrous lithium chloride

A lithium chloride, high-purity technology, applied in the direction of alkali metal chloride, etc., can solve the problems of difficult separation of impurities potassium and sodium, high production cost, unreasonable economy, etc., and achieve the effect of low cost, easy operation and simple process

Inactive Publication Date: 2008-05-07
青海中信国安科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While other methods are limited to experimental research, there is no industrial production yet, but no matter what kind of preparation method, there are problems of high raw material cost and difficult separation of impurities potassium and sodium. Scholars at home and abroad either use ion exchange or solvent extraction to separate potassium and sodium. The effect is ideal, but the production cost is high and economically unreasonable

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  • Method of producing high-purity anhydrous lithium chloride
  • Method of producing high-purity anhydrous lithium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add sodium hydroxide and barium chloride to low-magnesium, high-potassium sodium brine containing lithium chloride, and stir to precipitate magnesium ions and sulfate ions to obtain a mother liquor containing lithium chloride; then add a certain amount of sodium carbonate solution, Filtration and separation to remove traces of Ca 2+ , Ba 2+ ions to obtain a refined lithium chloride mother liquor, evaporate the mother liquor to close to the co-saturation point to separate a large amount of sodium chloride and potassium chloride, and spray dry the mother liquor to obtain a high-lithium mixed salt containing NaCl, KCl, and LiCl, wherein the LiCl content At 60-95%, weigh 100g of dry lithium mixed salt, including 93.18% of lithium chloride, 2.87% of sodium chloride, and 3.92% of potassium chloride, add it to 150ml of absolute ethanol, and stir at room temperature for 60 minutes under airtight conditions Filter to obtain the filtrate of lithium chloride; move the filtrate to...

Embodiment 2

[0018] Add sodium hydroxide and barium chloride to low-magnesium, high-potassium sodium brine containing lithium chloride, and stir to precipitate magnesium ions and sulfate ions to obtain a mother liquor containing lithium chloride; then add a certain amount of sodium carbonate solution, Filtration and separation to remove traces of Ca 2+ , Ba 2+ ions to obtain a refined lithium chloride mother liquor, evaporate the mother liquor to close to the co-saturation point to separate a large amount of sodium chloride and potassium chloride, and spray dry the mother liquor to obtain a high-lithium mixed salt containing NaCl, KCl, and LiCl, wherein the LiCl content At 60-95%, weigh 100g of dry lithium mixed salt, including lithium chloride 93.18%, sodium chloride 2.87%, potassium chloride 3.92%, add 300ml absolute ethanol and 50ml acetone mixed solution, under airtight condition, Stir at room temperature for 30 minutes and filter to obtain the filtrate of lithium chloride; transfer t...

Embodiment 3

[0020] Add sodium hydroxide and barium chloride to low-magnesium, high-potassium sodium brine containing lithium chloride, and stir to precipitate magnesium ions and sulfate ions to obtain a mother liquor containing lithium chloride; then add a certain amount of sodium carbonate solution, Filtration and separation to remove traces of Ca 2+ , Ba 2+ ions to obtain a refined lithium chloride mother liquor, evaporate the mother liquor to close to the co-saturation point to separate a large amount of sodium chloride and potassium chloride, and spray dry the mother liquor to obtain a high-lithium mixed salt containing NaCl, KCl, and LiCl, wherein the LiCl content At 60-95%, weigh 100g of dry lithium mixed salt, including lithium chloride 93.18%, sodium chloride 2.87%, potassium chloride 3.92%, add 850ml absolute ethanol and 150ml methanol mixed solution, under airtight condition, Stir at room temperature for 10 minutes and filter to obtain the filtrate of lithium chloride; transfer...

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Abstract

The invention belongs to the chemical field of inorganic salts, in particular to a preparation method of high-purity anhydrous lithium chloride; wherein, sodium hydroxide and barium chloride are added into the high-potassium sodium brine containing lithium chloride which is used as a raw material; the mixture is stirred and filtered to eliminate a great amount of Mg 2 <+> and SO 4 <2->; and the micro Mg 2 <+> and the SO 4 <2-> can be eliminated by adding sodium carbonate into the mixture, and then is filtered to get a refined mother liquid. The refined mother liquid can be evaporated and filtered to eliminate potassium chloride and sodium chloride; and high-potassium mixed salt containing 60 to 95 percent of lithium chloride can be achieved by spraying and drying the refined mother liquid. After adding low-carbon organic solvent, the high-potassium mixed salt is stirred to extract lithium chloride and filtered to eliminate potassium sodium salt. High-purity anhydrous lithium chloride with the purity of over 99.5 percent can be achieved by depressurizing and distilling the mother liquid. The invention is applicable to the extraction art of the lithium chloride used in all present low-magnesium salt lakes containing lithium, and the extraction process of the lithium chloride from the mother liquid achieved after pressing solid lithium ore. The invention not only has the advantages of simple process and low cost, but also is easy to be operated and used in industrialization and has no three-waste pollution.

Description

1. Technical field [0001] The invention belongs to the field of inorganic salt chemical industry, in particular to a preparation method of high-purity anhydrous lithium chloride. 2. Technical background [0002] Lithium chloride is an important lithium salt product, in addition to being used in air-conditioning dehumidifiers, bleaching powder, insecticides, synthetic fibers, pharmaceutical industry, lithium batteries, metal alloy welding agents, electrolytic fluxes, and the only one used in the production of lithium metal raw material. Lithium metal is not only one of the most important strategic materials in the national defense industry, but also an important metal element closely related to human daily life. At present, high-purity anhydrous lithium chloride is a kind of inorganic salt that is relatively scarce. Its application prospects Broad, the preparation methods of high-purity anhydrous lithium chloride are as follows: lithium carbonate or lithium hydroxide convers...

Claims

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Application Information

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IPC IPC(8): C01D3/06
Inventor 李陇岗吴小王杨建元
Owner 青海中信国安科技发展有限公司
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