Method for preparing lithium chloride free from water

A technology of lithium chloride and calcium chloride, which is applied in the direction of lithium halide, etc., can solve the problems of immaturity, and achieve the effect of simplifying the operation steps, reducing energy and water consumption, and shortening the process route

Active Publication Date: 2006-12-06
JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Lithium chloride is extracted from brine, but this

Method used

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  • Method for preparing lithium chloride free from water

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Effect test

Embodiment 1

[0033] (1) Pipette concentration is 1.6103mol / L lithium ore leaching liquid-lithium sulfate solution 800ml in the beaker of 2000ml. Place the beaker in a constant temperature water bath at 70°C, slowly add 860 ml of calcium chloride solution with a concentration of 1.5 mol / L while stirring, fully react for half an hour, then keep the temperature and let stand for 1.5 hours.

[0034] (2) vacuum filter the product obtained in step (1), and wash the calcium sulfate filter cake twice with 80° C. deionized water to obtain LiCl solution (mother liquor 1).

[0035] (3) Use hydrochloric acid to adjust the pH value of mother liquor 1 to 7, then concentrate it under reduced pressure to 500ml, measure its SO 4 2- and Ca 2+ content.

[0036] (4) Add 85ml of barium chloride solution of 0.5mol / L concentration while stirring in the concentrated solution of step (3) gained, stir for 20 minutes and filter after leaving standstill for 1 hour, and wash twice with 10 ℃ of deionized water.

[...

Embodiment 2

[0040] The temperature of the constant temperature water bath in step (1) of embodiment 1 is 80°C; the temperature of washing water in step (2) is 85°C, and the rest are the same as in embodiment 1. Analysis and determination of the obtained product LiCl content 99.15%; SO 4 2- Content 0.03%; K+Na 0.3%; other indicators are in line with GB10575-89 industrial first-class standards.

Embodiment 3

[0042] The 1.5mol / L calcium chloride solution that adds in the step (1) of embodiment 1 is 884ml, and the constant temperature water bath temperature is 85 ℃, after reacting for 45 minutes, it is incubated and left standstill for 2 hours; in the step (2), the washing water temperature is 85 ℃ , washing three times; Add the lithium carbonate solution 350ml of 0.1mol / L concentration in the step (4), stir 30 minutes and filter after leaving standstill 2 hours; All the other are with embodiment 1. Analysis and determination of the obtained product LiCl content 99.21%; SO 4 2- The content cannot be detected; K+Na 0.24%; other indicators are in line with the industrial first-class product standard in GB10575-89.

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Abstract

This invention discloses a method for preparing anhydrous LiCl. The method comprises: (1) adding CaCl2 to Li2SO4 solution to obtain LiCl and CaSO4; (2) filtering and washing to remove CaSO4 and obtain LiCl solution; (3) concentrating, adding BaCl2 solution, reacting, filtering and washing to remove SO42-; (4) adding LiCO3 solution, reacting, filtering and washing to remove Ba2+ and Ca2+; (5) concentrating, cooling, crystallizing, separating and drying to obtain anhydrous LiCl. The method has such advantages as simple process, easy operation, low energy and water consumption, low Li loss, and high LiCl yield.

Description

Technical field: [0001] The invention relates to a preparation method of anhydrous lithium chloride. Background technique: [0002] Lithium chloride is an important lithium salt product. In addition to being used in air-conditioning dehumidifiers, bleaching powder, pesticides, synthetic fibers, pharmaceutical industry, lithium batteries, metal alloy welding agents or fluxes, there is another very important use is For the production of lithium metal. At present, lithium metal has not only become one of the most important strategic materials for national defense, but also an important metal element closely related to human daily life. Lithium metal and its alloys and compounds are widely used in many fields such as atomic energy industry, metallurgical industry, battery, glass, ceramics, chemical industry, and aerospace industry manufacturing. In recent years, lithium chloride has also been widely used in the fields of biology and medicine. It is used in medicine to treat di...

Claims

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Application Information

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IPC IPC(8): C01D15/04
Inventor 景晓辉李南平葛建敏丁欣宇周晖施磊
Owner JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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