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Method for preparing battery-grade lithium carbonate through efficient decarburization of lithium bicarbonate solution

A lithium bicarbonate, lithium carbonate technology, applied in lithium carbonate;/acid carbonate, chemical instruments and methods, carbon compounds, etc., can solve energy loss, increase smelting cost, cannot be reused, etc. question

Pending Publication Date: 2020-08-18
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] By formula (1) as can be seen, this process is sloughing off CO While also evaporating the moisture in the solution, although the evaporation of moisture can concentrate lithium bicarbonate solution to a certain extent, has improved lithium carbonate yield, but moisture evaporation The crystallization process will take away a large amount of heat energy, resulting in a large amount of energy loss, increasing the cost of smelting, and the impurity content in the concentrated lithium bicarbonate mother liquor is also greatly increased, which cannot be reused in the hydrogenation process, and can only be prepared by evaporation and crystallization. grade lithium carbonate raw material, resulting in a waste of resources

Method used

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  • Method for preparing battery-grade lithium carbonate through efficient decarburization of lithium bicarbonate solution

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Effect test

Embodiment 1

[0020] Take 500ml of saturated lithium bicarbonate solution, the lithium content is about 8.5g / L, and keep the pressure at -0.085Mpa. At this time, the boiling point of the solution is about 55°C, react at 40°C for 30min, and obtain 450ml of the remaining decarburization mother liquor after filtration. The content is 2.1g / L; the tested lithium carbonate content is 99.60%, which meets the battery grade lithium carbonate (YS / T582-2013) content standard (≥99.5%).

Embodiment 4

[0026] Take 800ml of saturated lithium bicarbonate solution, the lithium content is about 8.5g / L, and maintain the pressure of -0.095Mpa. At this time, the boiling point of the solution is about 36°C, react at 25°C for 10min, and obtain 780ml of the remaining decarburization mother liquor after filtration. The lithium content is It is 1.8g / L; the content of lithium carbonate is 99.58% after testing, which meets the battery grade lithium carbonate (YS / T582-2013) content standard (≥99.5%).

Embodiment 5

[0028] Take 900ml of saturated lithium bicarbonate solution, the lithium content is about 8.3g / L, and maintain a pressure of -0.092Mpa. At this time, the boiling point of the solution is about 44°C, react at 35°C for 50min, and obtain 500ml of the remaining decarburization mother liquor after filtration. The lithium content is It is 1.8g / L; the tested lithium carbonate content is 99.53%, which meets the content standard (≥99.5%) of battery grade lithium carbonate (YS / T582-2013).

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Abstract

The invention discloses a method for preparing battery-grade lithium carbonate by efficient decarburization of a lithium bicarbonate solution, which comprises the following steps: carrying out negative pressure reaction on a saturated lithium bicarbonate solution, and carrying out solid-liquid separation to obtain the battery-grade lithium carbonate. According to the method, the saturated lithiumbicarbonate solution is decarburized to generate gas, so that the removal of CO2 is strengthened by utilizing negative pressure for the first time, and the decarburization of the lithium bicarbonate can be carried out at a relatively low temperature; therefore, the energy consumption generated by heating and evaporating water is avoided, and the obtained gas is pure CO2 gas instead of mixed gas ofwater vapor and CO2; meanwhile, concentration of impurities in the lithium bicarbonate mother liquor is avoided, CO2 and filtrate can be directly returned to a hydrogenation process together, and thecontent of lithium carbonate in the prepared product meets the battery-grade lithium carbonate standard (YS / T582-2013).

Description

technical field [0001] The invention belongs to the technical field of lithium carbonate preparation, and relates to a method for preparing battery-grade lithium carbonate, in particular to a method for efficiently decarburizing lithium bicarbonate solution to prepare battery-grade lithium carbonate. Background technique [0002] Lithium carbonate is the most important and basic lithium salt in the lithium industry. The purity of lithium carbonate directly determines the quality of subsequent products. The industrial preparation of battery-grade lithium carbonate is mainly based on industrial grade lithium carbonate and CO 2 Gas is used as the raw material. Firstly, industrial grade lithium carbonate is hydrogenated into saturated lithium bicarbonate solution, followed by decarburization treatment. At present, the mainstream decarbonization process in industry is high-temperature evaporation decarburization process. The decarburization temperature of this process is generally...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01B32/50
CPCC01D15/08C01B32/50
Inventor 洪侃
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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