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Purification process of removing impurity sodium from lithium chloride

A purification method and technology of lithium chloride, applied in the direction of alkali metal chloride, alkali metal halide purification, etc., can solve the problems of aggravating the difficulty of filtration and separation, long soaking and stirring time, unfavorable actual production, etc., achieving low cost, Easy operation and strong compatibility

Inactive Publication Date: 2005-01-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is good, it requires Li 1.3 Ti 1.7 al 0.3 (PO 4 ) 3 The small size of the particles increases the difficulty of filtration and separation, and the long soaking and stirring time is not conducive to actual production

Method used

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  • Purification process of removing impurity sodium from lithium chloride
  • Purification process of removing impurity sodium from lithium chloride
  • Purification process of removing impurity sodium from lithium chloride

Examples

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example 1

[0026] Example 1: Place a beaker containing 300 milliliters of industrial hydrochloric acid (concentration 30-33%) on a magnetic stirrer for magnetic stirring, then slowly add industrial-grade lithium carbonate (about 100 grams), monitor with pH test paper, close to neutral until sex. After the neutralization reaction was completed, LiOH was added to adjust the pH value to about 11, and then 10 ml of lithium oxalate with a concentration of 2.5% was added. Filtrate with a 0.5 μm microfiltration membrane to obtain the lithium chloride supernatant. Add 2.5 grams of Li 1.3 Ti 1.7 al 0.3 (PO 4 ) 3 The powder (average particle size is 3.5 microns), respectively stirred slowly for 5 hours, and then filtered with a 0.5 micron microfiltration membrane. The filtered lithium chloride liquid was placed in a titanium crucible and dried in an oven, and samples were taken for testing. The results of the atomic absorption spectrophotometer test show that the sodium (Na) impurities in t...

example 2

[0027] Example 2: Place a beaker with 300 milliliters of industrial hydrochloric acid (concentration 30-33%) on a magnetic stirrer for magnetic stirring, then slowly add industrial-grade lithium carbonate (about 100 grams), monitor with pH test paper, close to neutral until sex. After the neutralization reaction was completed, LiOH was added to adjust the pH value to about 11, and then 10 ml of lithium oxalate with a concentration of 2.5% was added. Filtrate with a 0.5 μm microfiltration membrane to obtain the lithium chloride supernatant. Add 5 grams of Li 1.3 Ti 1.7 al 0.3 (PO 4 ) 3 The powder (average particle size is 3.5 microns), respectively stirred slowly for 10 hours, and then filtered with a 0.5 micron microfiltration membrane. The filtered lithium chloride liquid was placed in a titanium crucible and dried in an oven, and samples were taken for testing. The results of the atomic absorption spectrophotometer test show that the sodium (Na) impurities in lithium ...

example 3

[0028] Example 3: Place a beaker with 300 milliliters of industrial hydrochloric acid (concentration 30-33%) on a magnetic stirrer for magnetic stirring, then slowly add industrial-grade lithium carbonate (about 100 grams), monitor with pH test paper, close to neutral until sex. After the neutralization reaction was completed, LiOH was added to adjust the pH value to about 11, and then 10 ml of lithium oxalate with a concentration of 2.5% was added. Filtrate with a 0.5 μm microfiltration membrane to obtain the lithium chloride supernatant. Add 5 grams of Li to 300 milliliters of lithium chloride clear solution at a constant temperature of 75 1.3 Ti 1.7 al 0.3 (PO 4 ) 3 Powder (average particle size 3.5 microns), stirred slowly for 10 hours, and then filtered with 0.5 micron microfiltration membrane. The filtered lithium chloride liquid was placed in a titanium crucible and dried in an oven, and samples were taken for testing. The result of testing with an atomic absorpt...

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Abstract

The invention relates to a high-purity lithium chloride preparing technical method for adding barium chloride, lithium hydroxide and lithium oxalate to a chemically synthetic lithium chloride solution to make chemical precipitation reaction and membrane filtration, eliminating SO42- ions and the metallic impurity ions of Fe3+, Al3+, Ni2+, Mg2+, Ca2+, etc from the lithium chloride solution, and then adding in ion exchange absorbent to deeply eliminate sodium impurities; at 60-95 deg.C, adding powdery inorganic ion exchange agent Li1.3Ti1.7Al0.3(PO4)3 or Li1.3Zr1.7Al0.3(PO4)3 in the lithium chloride solution after primarily eliminating impurities, making membrane filtration and deep elimination of sodium impurities, and then drying and obtaining the pure lithium chloride products; all the above technical courses are made at normal pressure; the impurity content in the lithium chloride products can be reduced: Na<10 ppm, Ca < 25 ppm, Mg < 10 ppm, and Fe < 7 ppm. The pure lithium chloride can completely act as the raw material further electrolyzed to produce metal lithium of excessive 99.9%.

Description

technical field [0001] The invention relates to a preparation method of general alkali metal chlorides, in particular to a process for removing impurity sodium from lithium chloride (LiCl). Background technique [0002] Due to the special properties of lithium and lithium compounds, it is more and more widely used in many fields of national economy. Not only civilian needs are growing, but also new demands are constantly emerging in the military, especially in high-tech fields. For lithium and its compounds, not only the quantity but also the quality, purity and variety are required. [0003] High-purity lithium and lithium compounds generally require >99.9% purity. The production of lithium starting materials lithium chloride and lithium carbonate must also have strict requirements on purity. The impurities that are difficult to separate from lithium and lithium compounds are potassium, sodium, calcium, magnesium and especially sodium. Due to the extremely similar pr...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01D3/14C01D3/16
Inventor 娄太平李大纲
Owner NORTHEASTERN UNIV
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