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Production of high purity lithium carbonate from brines

A lithium carbonate, brine technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of waste of resources, technical complexity, high cost, etc., to achieve improved productivity, low technical complexity, and shortened time Effect

Pending Publication Date: 2021-07-30
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Another disadvantage of existing methods is that they are technically complex to implement and thus unnecessarily waste a lot of resources and require high costs, that is to say they cannot be implemented economically satisfactorily

Method used

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  • Production of high purity lithium carbonate from brines
  • Production of high purity lithium carbonate from brines
  • Production of high purity lithium carbonate from brines

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0168] A) Removal of calcium ions, magnesium ions and strontium ions by precipitation

[0169] To 1 l of brine (37 g / l of Ca 2+ , 3.7g / l of Mg 2+ , 2.3g / l of Sr 2+ , 65g / l Na + and 140ppm Li + (0.014g / l)) adding 0.32l of Na 2 CO 3solution (400g / l, 129.3g) and 0.05l of NaOH (1000g / l, 48.8g). The brine and precipitating agent are mixed here at a stirring rate of 350 rpm. The dispersion formed was filtered off via a filter funnel at a pressure of 2 bar. Purified brine contains Ca at a concentration below 20ppm 2+ 、Sr 2+ and Mg 2+ and 140ppm Li + And has a pH of 11.

[0170] B) Removal of Ca by chelating resins containing aminomethylphosphonic acid groups 2+ 、Sr 2+ and Mg 2+

[0171] The macroporous monodisperse chelating resin that contains the functional group with structural element (I) that vector cylinder fills 50ml, wherein R 1 and R 2 independently of each other = -CH 2 PO(OX 1 ) 2 、-CH 2 PO(OH)OX 2 or hydrogen, where both cannot be hydrogen at ...

example 2

[0178] A) Removal of calcium ions, magnesium ions and strontium ions by precipitation

[0179] To 1 l of brine (37 g / l of Ca 2+ , 3.7g / l of Mg 2+ , 2.3g / l of Sr 2+ , 65g / l Na + and 140ppm Li + (0.014g / l)) add 0.32ml of Na 2 CO 3 solution (400g / l, 129.3g) and 0.05l of NaOH (1000g / l, 48.8g). The brine and precipitating agent are mixed here at a stirring rate of 350 rpm. The dispersion formed was filtered off via a filter funnel at a pressure of 2 bar. Purified brine contains Ca at a concentration below 20ppm 2+ 、Sr 2+ and Mg 2+ and 140ppm Li + And has a pH of 11.

[0180] B) Removal of Ca by chelating resins containing iminodiacetic acid groups 2+ 、Sr 2+ and Mg 2+

[0181] The macroporous monodisperse chelating resin that contains the functional group with structural element (I) that vector cylinder fills 50ml, wherein R 1 and R 2 independently of each other = -CH 2 COOX or hydrogen, but R 1 and R 2 cannot both be hydrogen at the same time, and X is hy...

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Abstract

The invention relates to a method for the production of high purity lithium carbonate from brines.

Description

technical field [0001] The invention relates to a method for preparing high-purity lithium carbonate from brine. Background technique [0002] Lithium carbonate is an important material used in the production of lithium-ion batteries. Lithium-ion batteries are used as energy storage devices in electric vehicles, mobile radios and grid storage. The production of lithium-ion batteries requires the use of high-purity lithium, as contamination can reduce the capacity and lifespan of batteries. [0003] Lithium can be obtained in particular from brines which may be contaminated with alkaline earth metals such as magnesium and calcium, and also with potassium, chloride, bromide or borate. [0004] Natural brines form the basis of 66% of global lithium reserves. However, such brines usually contain only very small amounts of lithium. For example, brine from the Great Salt Lake in Utah contains only about 34 to 66 ppm lithium. Other natural brines such as those derived from min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 迪尔克·施泰因希尔贝尔斯特凡·诺伊法因德都筑信太郎约阿希姆·科拉里克
Owner LANXESS DEUTDCHLAND GMBH
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