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Method of making high purity lithium hydroxide and hydrochloric acid

A technology of lithium hydroxide and lithium hydroxide monohydrate, which is applied in the direction of lithium oxide;/hydroxide, hydrogen chloride preparation, chloride preparation, etc., can solve the problems of not providing lithium products, difficult separation cost, expensive, etc.

Inactive Publication Date: 2011-04-13
ROCKWOOD LITHIUM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] The above methods of obtaining lithium from natural brines or mixtures of alkali and alkaline earth metal salts are difficult or expensive to separate and often do not provide lithium products of sufficient purity for some industrial applications

Method used

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  • Method of making high purity lithium hydroxide and hydrochloric acid
  • Method of making high purity lithium hydroxide and hydrochloric acid

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Embodiment approach

[0107] Referring to the accompanying drawings, which disclose the process of a preferred embodiment of the invention, a lithium chloride-containing brine (1) is provided, which may be natural or produced eg from ores. The brine is subjected to an initial purification step (2) to reduce the content of unwanted ions or other impurities. This can be accomplished by, for example, precipitating magnesium, boron, barium and calcium or sodium, forming insoluble salts by methods such as those previously described or other methods known in the art, adjusting the pH of the brine to make it alkaline so that unwanted ions form hydroxides precipitation. This brine is then used in further steps, using brine (3) or more suitable for the application at hand, for a secondary purification step (4) using ion exchange such as described above. Finally, the total amount of Ca and Mg in the brine before electrolysis is lower than 150 ppb by any combination of chemical, solar evaporation, or ion exc...

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Abstract

The present invention relates to a process for producing high purity lithium hydroxide monohydrate, comprising following steps: concentrating a lithium containing brine; purifying the brine to remove or to reduce the concentrations of ions other than lithium; adjusting the pH of the brine to about 10.5 to 11 to further remove cations other than lithium, if necessary; neutralizing the brine with acid; purifying the brine to reduce the total concentration of calcium and magnesium to less than 150 ppb via ion exchange; electrolyzing the brine to generate a lithium hydroxide solution containing less than 150 ppb total calcium and magnesium, with chlorine and hydrogen gas as byproducts; producing hydrochloric acid via combustion of the chlorine gas with excess hydrogen and subsequent scrubbing of the resultant gas stream with purified water, if elected to do so; and concentrating and crystallizing the lithium hydroxide solution to produce lithium hydroxide monohydrate crystals.

Description

[0001] Pursuant to 35 U.S.C. §119(e), this application claims the benefit of U.S. Provisional Patent Application No. 61 / 125,011, filed April 22, 2008, which is hereby incorporated by reference in its entirety for all purposes. technical field [0002] The present invention relates to a process for the production of high purity lithium products, in particular lithium hydroxide monohydrate, for commercial use, especially for batteries. Background technique [0003] Lithium hydroxide monohydrate (LiOHH 2 O) can pass through slaked lime (Ca(OH) 2 ) and lithium carbonate (Li 2 CO 3 ) is produced by causticizing in water. Slaked lime can be mixed with water (H 2 O) formed in compounded calcium oxide (CaO). This method produces approximately 3% lithium hydroxide in water, which is then concentrated to a saturated solution and crystallized by standard industrial procedures. The reaction looks like this: [0004] CaO+H 2 O=Ca(OH) 2 +hot [0005] Li 2 CO 3 +Ca(OH) 2 =2LiO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00
CPCC01D15/02C01B7/012C25B1/16Y02P20/133C01B7/03C25B15/08
Inventor 大卫·J·巴克利J·大卫·詹得斯丹·阿瑟顿
Owner ROCKWOOD LITHIUM INC
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