Method of producing battery-grade lithium carbonate through sulfuric acid process

A lithium carbonate and battery-level technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of high equipment investment cost, high energy consumption of equipment, scaling and blocked pipes, etc., and reduce equipment investment cost , Simplify the process and save cost

Inactive Publication Date: 2018-04-17
TIANQI LITHIUM CORP
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Problems solved by technology

[0003] Aiming at the problems that the existing sulfuric acid method for producing battery-grade lithium carbonate needs to be evaporated and concentrated, the energy consumption of the equipment is high, the concentration of calcium ions in the solution is high, it is easy to cause fouling to block the pipeline, and the production and equipment input costs are high. The present invention provides a A method for producing battery-grade lithium carbonate by the sulfuric acid method that does not require high-temperature evaporation and concentration, does not require the use of three-effect high-temperature evaporation equipment, can effectively save equipment energy consumption, reduce production costs, and reduce the concentration of calcium ions in the solution

Method used

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  • Method of producing battery-grade lithium carbonate through sulfuric acid process

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Embodiment 1

[0032] The concrete process that present embodiment sulfuric acid process produces battery-grade lithium carbonate is as follows:

[0033] 1. Transformation roasting of lithium concentrate: transform α-spodumene ore at 1050°C for 25 minutes to generate β-spodumene roasting material.

[0034] 2. Acidification roasting: During acidification roasting, add sulfuric acid to the fine powder roasted material after ball mill ball milling, mix evenly, and the material-acid ratio is 22:6, and roast at 265°C for 25 minutes to obtain acid clinker.

[0035] 3. Leaching:

[0036] A. Leaching: put the lithium ore acid clinker after acidification and roasting into the reaction kettle filled with slurry mixing liquid according to the liquid-solid ratio of 1.5:1, and carry out continuous stirring reaction at 25°C, and add single fly powder at the same time to adjust the slurry. pH to 5.0, after reacting for 10 minutes, pass the slurry into plate-and-frame filter equipment for filtration to obt...

Embodiment 2

[0048] The concrete process that present embodiment sulfuric acid process produces battery-grade lithium carbonate is as follows:

[0049] 1. Transformation roasting of lithium concentrate: transform α-spodumene ore at 1150°C for 35 minutes to generate β-spodumene roasting material.

[0050] 2. Acidification roasting: During acidification roasting, add sulfuric acid to the fine powder roasted material after ball mill ball milling, mix evenly, and the material-acid ratio is 23:6. After roasting at 275°C for 35 minutes, acid clinker is obtained.

[0051] 3. Leaching:

[0052] A. Leaching: Put the lithium ore acid clinker after acidification and roasting into the reaction kettle filled with slurry mixing liquid according to the liquid-solid ratio of 2:1, and carry out continuous stirring reaction at 35°C, and add single fly powder at the same time to adjust the slurry. pH to 5.3, after reacting for 30 minutes, pass the slurry into plate-and-frame filter equipment for filtration ...

Embodiment 3

[0060] The concrete process that present embodiment sulfuric acid process produces battery-grade lithium carbonate is as follows:

[0061] 1. Transformation roasting of lithium concentrate: transform α-spodumene ore at 1350°C for 45 minutes to generate β-spodumene roasting material.

[0062] 2. Acidification roasting: During acidification roasting, add sulfuric acid to the fine powder roasted material after ball mill ball milling, mix evenly, the material-acid ratio is 22:6, and roast at 285°C for 45 minutes to obtain acid clinker.

[0063] 3. Leaching:

[0064] A. Leaching: Put the lithium ore acid clinker after acidification and roasting into the reaction kettle filled with slurry mixing liquid according to the liquid-solid ratio of 2.5:1, and carry out continuous stirring reaction at 60°C, and add single fly powder at the same time to adjust the slurry. pH to 6.0, after reacting for 60 minutes, pass the slurry into plate and frame filter equipment for filtration to obtain ...

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Abstract

The invention provides a method of producing battery-grade lithium carbonate through a sulfuric acid process and belongs to the technical field of battery-grade lithium carbonate preparation. The method includes: transform-roasting, acidify-roasting, leaching, purifying, lithium-setting, washing, drying, and smashing. A circulatory leaching mode is adopted, so that lithium concentration in leachate can be increased effectively, and high-concentration lithium-containing leachate can be produced directly; evaporation and concentration are not needed, and lithium setting can be directly performedafter purifying to produce lithium carbonate. The high-concentration lithium-containing leachate can be obtained through circulatory leaching, so that requirements of lithium setting on high-concentration lithium can be met without increasing calcium ion concentration in purified liquid, and product quality is improved effectively. By adopting the method, using of triple-effect high-temperature evaporation equipment can be avoided, so that energy conservation and consumption reduction are realized, equipment investment cost is lowered, technological processes are simplified, and battery-gradelithium carbonate produced by the method is stable and high in quality and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of battery-grade lithium carbonate preparation, in particular to a method for producing battery-grade lithium carbonate by a sulfuric acid method. Background technique [0002] According to the process for preparing lithium carbonate in the existing industrial production, a high concentration lithium sulfate solution is required to participate in the reaction in the lithium carbonate lithium sinking reaction process. The high-concentration lithium sulfate solution is obtained after the low-concentration lithium sulfate solution is evaporated and concentrated at high temperature. In the process of extracting lithium from ore, lithium ore is leached after high-temperature roasting and acidification roasting. Whether it is neutral leaching or acid leaching, the concentration of lithium oxide in the obtained leachate is low, so after the impurity removal process, must be carried out Concentrated by evaporation....

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2004/61C01P2006/80
Inventor 曹乃珍高洁王蒙蒙徐川王梦钟兆资何霞
Owner TIANQI LITHIUM CORP
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