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Method for producing high-purity lithium carbonate by causticizing and carbonizing coarse lithium carbonate lime

A high-purity lithium carbonate and lithium carbonate technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of difficult to guarantee the content of raw materials impurities, high raw material cost, and high requirements for LiOH solution, and achieve quality assurance. , The effect of better quality control and low cost

Pending Publication Date: 2022-03-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, industrial-grade lithium hydroxide does not need to be recrystallized and purified, but is directly used to react with carbon dioxide to obtain high-purity lithium carbonate products. high cost

Method used

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  • Method for producing high-purity lithium carbonate by causticizing and carbonizing coarse lithium carbonate lime
  • Method for producing high-purity lithium carbonate by causticizing and carbonizing coarse lithium carbonate lime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Add crude lithium carbonate (containing 55wt% lithium carbonate) to the reaction tank, add water to wash and filter, then add quicklime and water, the liquid-solid ratio is 3, the molar ratio between quicklime and lithium carbonate is 1.1, and the stirring reaction temperature The temperature is 30°C, and the reaction time is 2 hours. Filter and separate the causticized calcium carbonate filter residue to obtain a lithium hydroxide solution (containing 13 g / L of lithium and 10 g / L of sulfate). Concentrate the lithium hydroxide solution to obtain lithium-containing 16 Lithium hydroxide solution in grams per liter, the added barium hydroxide and oxalic acid are stirred and reacted, the molar ratio of barium hydroxide and sulfate ion is 1:1.5, the amount of oxalic acid is 5 kg per cubic, and the refined solution of lithium hydroxide is obtained by filtration; Add half of the lithium hydroxide refined liquid into the carbonization reaction kettle and pass carbon di...

Embodiment 2

[0033]Add crude lithium carbonate (containing 75wt% lithium carbonate) to the reaction tank, add water to wash and filter, then add quicklime and water, the liquid-solid ratio is 3.5, the molar ratio between quicklime and lithium carbonate is 1.2, and the stirring reaction temperature is 60°C , the reaction time is 3 hours, filter and separate the causticized calcium carbonate filter residue and obtain a lithium hydroxide solution (containing 11 g / L of lithium and 10 g / L of sulfate), and concentrate the lithium hydroxide solution to obtain 17 g / L of lithium Lithium hydroxide solution, the added barium hydroxide and oxalic acid stirred and reacted, the molar ratio of barium hydroxide and sulfate ion was 1:1.25, the amount of oxalic acid was 6 kg per cubic meter, filtered to obtain a refined solution of lithium hydroxide; Lithium refined solution is added into the carbonization reaction kettle and carbon dioxide gas is passed into it for carbonization. The carbonization temperatu...

Embodiment 3

[0037] Add crude lithium carbonate (containing 55wt% lithium carbonate) into the reaction tank, add water to wash and filter, then add quicklime and water, the liquid-solid ratio is 3, the molar ratio between quicklime and lithium carbonate is 1.1, and the stirring reaction temperature is 30°C , the reaction time is 2 hours, filter and separate the causticized calcium carbonate filter residue and obtain a lithium hydroxide solution (containing lithium 10 g / L, sulfate radical 5 g / L), and concentrate the lithium hydroxide solution to obtain a lithium hydroxide solution containing 14 g / L Lithium hydroxide solution, the added barium hydroxide and oxalic acid stirred and reacted, the molar ratio of barium hydroxide and sulfate ion was 1:1.15, the amount of oxalic acid was 3 kg per cubic meter, filtered to obtain a refined solution of lithium hydroxide; Lithium refined solution is added into the carbonization reaction kettle and carbon dioxide gas is passed into it for carbonization....

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Abstract

The invention discloses a method for producing high-purity lithium carbonate by causticizing and carbonizing coarse lithium carbonate lime, which comprises the following steps: 1) adding water into the coarse lithium carbonate to remove soluble salt, stirring the separated solid with water and quicklime to react, and carrying out solid-liquid separation to obtain a lithium hydroxide solution; 2) concentration; 3) adding an impurity removal agent into the concentrated solution, stirring for reaction, and performing solid-liquid separation to obtain a refined solution; 4) absorbing carbon dioxide by one part of the refined solution, carbonizing, and filtering to obtain a lithium bicarbonate solution; and 5) mixing and reacting the lithium bicarbonate solution with the other part of the refined solution to obtain the high-purity lithium carbonate. According to the invention, the traditional gas-liquid reaction process of carbonization and lithium precipitation of carbon dioxide absorbed by lithium hydroxide is converted into liquid-liquid reaction, the tolerance of impurities in the solution can be increased, the crystallization is mild, the purity and granularity of the product are easy to control, the inclusion of the impurities is not easy to form, the washing procedure is reduced, the procedures of ion exchange and lithium bicarbonate pyrolysis are omitted, and the production cost is reduced. The investment cost and the evaporation load are greatly reduced, and large profits can be achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium salts, in particular to a method for producing high-purity lithium carbonate by caustic carbonization of crude lithium carbonate lime. Background technique [0002] Lithium, as an "energy upstart in the 21st century", is the lightest metal in nature, and has the characteristics of high electrical conductivity and strong chemical activity. At the same time, lithium is also the battery material with the highest energy density, known as "energy metal" and "an important element that drives the world forward". High-purity lithium carbonate has been widely used in batteries, medicine, military industry, aerospace and other fields, and is a raw material for the preparation of other high-purity lithium salts. The preparation of high-purity lithium carbonate has become one of the research hotspots in recent years. However, there are many problems in the preparation and purification process ...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80Y02P20/141
Inventor 旷戈姜昀郑芳妍刘粤李延鹤刘慧勇
Owner FUZHOU UNIV
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