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Process for purifying lithium chloride

A process method, lithium chloride technology, applied in the direction of lithium halide, etc., can solve the problems of high production cost, volatile, flammable, etc., and achieve the effect of less equipment investment, short process flow and easy operation

Inactive Publication Date: 2004-03-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that dissolving and recrystallizing lithium chloride is the main body, and isopropanol is bulky during operation. As an organic solvent, it is flammable, volatile and slightly toxic, and the production cost is high. Obviously, it is not an economical measure. best production method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Take industrial lithium carbonate plus hydrochloric acid according to the chemical formula reaction, to obtain a solution of lithium chloride, add barium chloride, then add lithium hydroxide to adjust the pH=9, add lithium oxalate and stir at room temperature, carry out precipitation reaction, and then go through coarse filtration, microfiltration and ultrafiltration to make After solid-liquid separation, remove sulfate, calcium, iron, and magnesium impurities, take 50ml of the clear liquid (containing 20 grams of LiCl), put it into a 150ml beaker, adjust the pH to 9, and add 0.5 grams of purifying agent LF (powder) , at room temperature, magnetic stirring and purification for 16 hours, after microfiltration to an average pore size of 0.05 to 0.5 μm and ultrafiltration to a molecular weight of 60,000 to 20,000, the clear solution was concentrated and dried to obtain pure lithium chloride. Sampling analysis, using atomic absorption spectrophotometry to measure Na, K...

example 2

[0027] Obtain lithium chloride clear liquid according to the method described in Example 1, get 50ml (containing 20 grams of LiCl) and fill in a 150ml beaker, adjust pH=11, add 0.5 grams of scavenger LF (powder), under normal temperature stirring, purify 23.5 hour, after microfiltration, ultrafiltration (same example 1), the clear liquid was concentrated and dried to obtain a solid lithium chloride product. Sampling was determined by atomic absorption spectrophotometry and chemical analysis. As a result, this lithium chloride contains impurities Na10.3ppm, K9.6, Ca16.6, Mg8.5, Fe4.2.

example 3

[0029] Obtain lithium chloride clear liquid by the method of example 1, get 175ml (containing LiCl 70 grams) clear liquid, fill in the 500ml beaker, adjust pH=11, add 1.3 grams of cleaning agent LF (powder), under stirring at normal temperature, purify 24 hour, then through microfiltration, ultrafiltration (same example 1), get the clear liquid through concentration and drying again, get the lithium chloride product, measure sodium, potassium, calcium, magnesium, iron with atomic absorption spectrophotometry and chemical analysis method As a result, lithium chloride contains impurities (ppm): Na8.7, K8.5, Ca18.1, Mg9.2, Fe3.8.

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Abstract

A process for purifying lithium chloride (LiCl) from industry grade LiCl and hydrochloric acid includes mixing the above raw materials, adding barium chloride and lithium hydroxide to PH=9-13, adding lithium oxalate or oxalic acid under normal temperature and stir to get the mixture of precipitation of barium sulfate, calcium oxalate, magnesium hydroxide and ironic hydroxide, passing the mixture through a membranous filter to get rid of the ions of sulfate, calcium, magnesium and iron, adding a reagent LF with a composition of Li1+xAxB2-x(PO4)3 under normal temperature, ordinary pressure, and PH9-13, purifying 6-96 hours with stir, passing it through a membranous filter again, concentrating and drying. The pureness of lithium chloride obtained is higher than 99.9%, and Na<30ppm, K<10ppm, Ca<20ppm, Mg<10ppm, Fe<5ppm.

Description

technical field [0001] The invention relates to a purification process for compound lithium chloride, in particular to a purification process for removing impurities such as sodium and potassium in lithium chloride. Background technique [0002] High-purity metallic lithium (purity > 99.9%) has been widely used in various fields, such as lithium batteries, lithium-containing structural alloys, high-tech nuclear energy, and aluminum-lithium structural alloys used in aviation and aerospace. At present, high-purity metal lithium is mainly obtained from high-purity lithium chloride (purity>99.9%) through molten salt electrolysis. Therefore, obtaining high-purity lithium chloride is a crucial part. [0003] The impurities in industrial lithium chloride (purity below 99.5%) are mainly impurities such as calcium, iron, magnesium, sodium, potassium, sulfate and carbonate. These impurities are harmful impurities, which will enter the product metal lithium during molten salt e...

Claims

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Application Information

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IPC IPC(8): C01D15/04
Inventor 李席孟蓝为君刘秀儒金哲男
Owner NORTHEASTERN UNIV
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