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Method for preparing high-purity lithium carbonate with co-production of lithium fluoride by employing crude lithium carbonate

A technology of high-purity lithium carbonate and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, lithium halide, products, etc., can solve the problems that the products cannot meet the requirements of high-purity lithium carbonate, and achieve social benefits Significant environmental and environmental benefits, significant environmental benefits and economic benefits, solving the problem of single raw materials for preparation

Active Publication Date: 2015-02-04
河南省氟基新材料科技有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for utilizing crude lithium carbonate to prepare high-purity lithium carbonate to co-produce lithium fluoride, to solve the problem that the product obtained in the existing preparation method using salt lake lithium as raw material cannot meet the requirements of high-purity lithium carbonate

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  • Method for preparing high-purity lithium carbonate with co-production of lithium fluoride by employing crude lithium carbonate
  • Method for preparing high-purity lithium carbonate with co-production of lithium fluoride by employing crude lithium carbonate
  • Method for preparing high-purity lithium carbonate with co-production of lithium fluoride by employing crude lithium carbonate

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Embodiment 1

[0047] Utilize crude lithium carbonate of the present embodiment to prepare the method for high-purity lithium carbonate co-production lithium fluoride, as figure 1 shown, including the following steps:

[0048] 1) Refining of crude lithium carbonate: take 3522 kg of crude lithium carbonate (mass content of lithium carbonate is 40%) from salt lake, add water to prepare slurry A, the liquid-solid ratio (l / s) is 1.5, stir at 100°C for 0.5h, Dissolve soluble carbonate compounds such as Na and K, filter and wash after the dissolution is complete, and obtain 2296kg of lithium carbonate concentrate; the washing water is used to produce other products, such as potassium fluoride, sodium fluoride, etc.;

[0049] 2) Preparation of crude lithium hydroxide solution: add water to the lithium carbonate concentrate obtained in step 1) to prepare lithium carbonate slurry, add lime and carry out causticization reaction, the mol ratio of carbonate in lime and lithium carbonate slurry is 1.0:1 ...

Embodiment 2

[0055] Utilize crude lithium carbonate of the present embodiment to prepare the method for high-purity lithium carbonate co-production lithium fluoride, as figure 1 shown, including the following steps:

[0056] 1) Refining of crude lithium carbonate: take 2348kg of crude lithium carbonate (mass content of lithium carbonate is 60%) from salt lake, add water to prepare slurry A, the liquid-solid ratio (l / s) is 1.0, stir at 20°C for 10h, dissolve Soluble carbonate compounds such as Na and K are filtered and washed after being completely dissolved to obtain 2000kg of lithium carbonate concentrate; the washing water is used to produce other products, such as potassium fluoride, sodium fluoride, etc.;

[0057] 2) Preparation of crude lithium hydroxide solution: adding water to the lithium carbonate concentrate obtained in step 1) is mixed with lithium carbonate slurry, adding lime to carry out causticization reaction, and the mol ratio of carbonate in lime and lithium carbonate slu...

Embodiment 3

[0063] Utilize crude lithium carbonate of the present embodiment to prepare the method for high-purity lithium carbonate co-production lithium fluoride, as figure 1 shown, including the following steps:

[0064] 1) Refining of crude lithium carbonate: take 2013kg of crude lithium carbonate (mass content of lithium carbonate is 70%) from salt lake, add water to prepare slurry A, the liquid-solid ratio (l / s) is 1.2, stir at 80°C for 3h, dissolve Soluble carbonate compounds such as Na and K are filtered and washed after being completely dissolved to obtain 1899kg of lithium carbonate concentrate; the washing water is used to produce other products, such as potassium fluoride and sodium fluoride;

[0065] 2) Preparation of crude lithium hydroxide solution: adding water to the lithium carbonate concentrate obtained in step 1) is mixed with lithium carbonate slurry, adding lime to carry out causticization reaction, and the mol ratio of carbonate in lime and lithium carbonate slurry ...

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Abstract

The invention discloses a method for preparing high-purity lithium carbonate with co-production of lithium fluoride by employing crude lithium carbonate. The method includes following steps: (1) preparing the crude lithium carbonate into lithium carbonate concentrate; (2) preparing the lithium carbonate concentrate into a slurry material with addition of lime and performing filtration to obtain a crude lithium hydroxide solution; (3) concentrating and filtering the crude lithium hydroxide solution, adding a complexing agent to remove impurity metal ions to obtain a refined lithium hydroxide solution; (4) feeding CO2 into the refined lithium hydroxide solution for carbonization and performing filtration to obtain a lithium bicarbonate solution; and (5) heating the lithium bicarbonate solution, performing a filtering and washing process, drying a filter cake to obtain the high-purity lithium carbonate, mixing the filtrate and a washing liquid with addition of hydrofluoric acid, performing a filtering and washing process, and then drying the filter cake to obtain the lithium fluoride. By means of the method, impurity ions in the high-purity lithium carbonate is in the trace-amount grade. The quality of the high-purity lithium carbonate is better in an industrial requirement in YS / T546-2008. Problems of poor quality, low lithium yield and high production cost in preparation of the high-purity lithium carbonate from salt lake lithium are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium carbonate refining, and in particular relates to a method for preparing high-purity lithium carbonate and co-producing lithium fluoride by using crude lithium carbonate. Background technique [0002] Lithium element is known as "the energy metal of the 21st century" because of its special properties. Lithium element and its compounds are called "industrial monosodium glutamate". The product uses span the lithium industry chain of many cutting-edge industries. Lithium and its compounds are mainly derived from the extraction of lithium ore and salt lake lithium resources. Lithium carbonate (Li 2 CO 3 ) As one of the basic lithium salt products, domestic enterprises divide lithium carbonate into industrial grade lithium carbonate (main content<99.50%), battery-grade lithium carbonate (99.50%≤content<99.99%) and high-purity lithium carbonate (main content≥99.99%), mainly used in ceramics, gla...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01D15/04
CPCY02P20/141
Inventor 李世江侯红军杨华春于贺华王建萍刘海霞曹军艳李霞耿梦湍孙斌斌
Owner 河南省氟基新材料科技有限公司
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