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Preparation method of cell-grade anhydrous lithium iodide

A technology of water lithium iodide and lithium iodide, applied in lithium halide and other directions, can solve the problems of difficult separation of by-products, expensive raw materials, difficult control of conditions, etc., and achieves the effects of cheap raw materials, easy availability of raw materials, and oxidation prevention.

Inactive Publication Date: 2011-04-27
XINJIANG RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation methods of lithium iodide mainly include: liquid ammonia medium method, acetone medium method, ether medium method, etc., but the above methods have complex equipment, expensive raw materials, difficult control conditions, low yield, and difficulty in separating from by-products and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 455.2 g of newly prepared hydriodic acid with a mass fraction of about 42%, pour it into a beaker, and stir with a magnetic stirrer, slowly add 56 g of lithium carbonate, and stir for 1 hour to obtain a lithium iodide solution.

[0023] Filtrate, evaporate the filtrate on an electric furnace to concentrate the filtrate to 150°C, place it for natural cooling and crystallization; filter and separate the crystallization liquid to obtain needle-like crystals of lithium iodide trihydrate; recover the mother liquor.

[0024] The lithium iodide trihydrate needle crystals were pre-dried in an oven at 60° C. for 3 hours to remove the attached water and free iodine on the crystal surface to obtain white crystals.

[0025] Put the white crystals into a drying dish and put them in a vacuum drying oven, raise the temperature to 200°C, and vacuum the degree of not less than 5000Pa, and vacuum dry the material for 24 hours to obtain a white needle-shaped anhydrous lithium iodide ...

Embodiment 2

[0028] Weigh 455.2 g of newly prepared hydriodic acid with a mass fraction of about 42%, pour it into a beaker, and stir with a magnetic stirrer, slowly add 62.6 g of lithium hydroxide monohydrate, and stir for 1 hour to obtain a lithium iodide solution.

[0029] Filtrate, evaporate the filtrate on an electric furnace to concentrate the filtrate to 150°C, place it for natural cooling and crystallization; filter and separate the crystallization liquid to obtain needle-like crystals of lithium iodide trihydrate; recover the mother liquor.

[0030] Pre-dry the lithium iodide trihydrate needle crystals in an oven at 60°C for 3 hours to remove the attached water and free iodine on the crystal surface to obtain white crystals.

[0031] Put the white crystals into a drying dish and put them in a vacuum drying oven, raise the temperature to 200°C, and vacuum the degree of not less than 5000Pa, and vacuum dry the material for 24 hours to obtain a white needle-shaped anhydrous lithium io...

Embodiment 3

[0034] Weigh 455.2g of newly prepared hydroiodic acid with a mass fraction of about 42%, pour it into a beaker, and stir with a magnetic stirrer, slowly add 54g of lithium carbonate, then add about 1.3g of lithium hydroxide monohydrate, and continue stirring for 1 hour Lithium iodide solution was obtained.

[0035] Filtrate the solution to obtain the filtrate; evaporate and concentrate the filtrate to 150°C on an electric furnace, place it for natural cooling and crystallization; filter and separate the crystallization liquid to obtain needle-like crystals of lithium iodide trihydrate; recover the mother liquor.

[0036] The lithium iodide trihydrate needle crystals were pre-dried in an oven at 60° C. for 3 hours to remove the attached water and free iodine on the crystal surface to obtain white crystals.

[0037] Put the white crystals into a drying dish and put them in a vacuum drying oven, raise the temperature to 200°C, and vacuum the degree of not less than 5000Pa, and va...

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PUM

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Abstract

The invention discloses a preparation method of a cell-grade anhydrous lithium iodide. The preparation method is as follows: mixing and stirring lithium salt and hydroiodic acid; filtering, evaporating, crystallizing and separating, obtaining acicular crystal of lithium iodide trihydrate; then carrying out pre-drying and vacuum drying; and finally obtaining the cell-grade anhydrous lithium iodide. For the preparation method, the preparation process is simple, the material is cheap and is easy to obtain, the preparation cost is low, and in the whole synthetic process, no organic solvent is adopted, is non-toxic, and is green and environment-friendly. In the anhydrous lithium iodide prepared by the invention, the water content is lower than 0.02%, and the quality is equivalent to that of imported products.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a preparation method of lithium salt, in particular to a preparation method of battery-grade anhydrous lithium iodide. Background technique [0002] Lithium iodide is an important chemical reagent. As a catalyst in organic synthetic chemistry, it has the advantages of high yield, stable reaction and high selectivity, and has been valued by the chemical community. The battery-grade anhydrous lithium iodide, as the electrolyte of the battery, is a high value-added product. It has been widely used as a power source material for cardiac pacemakers. It has high energy, low loss, long life and good sealing performance Prevent the inflow of body fluids and other advantages. [0003] White crystalline lithium iodide is a very active compound. It is oxidized to generate free iodine when exposed to light or exposed to air for a long time, and the color turns red, which reduces the purity. I...

Claims

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Application Information

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IPC IPC(8): C01D15/04
Inventor 王蓁刘力吴鹏马育新
Owner XINJIANG RES INST OF NON FERROUS METALS
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