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A technology of lithium carbonate and lithium bicarbonate, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of high energy consumption of products, running out of troughs, and inability to recycle the mother liquor, so as to improve the utilization rate and reduce the cost effect
Inactive Publication Date: 2011-04-27
SHANGHAI CHINA LITHIUM INDAL
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The main defects of this method are: high product cost, low utilization rate of carbon dioxide, mother liquor cannot be recycled, low product yield (85%), large material circulation, high product energy consumption, serious material sticking to the wall and trough leakage
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Embodiment 1
[0027] (1) 5M 3 Add 4100Kg of pure water to the stainless steel dissolution tank, add 825Kg of industrial grade lithium hydroxide under stirring, stir for 30 minutes to dissolve the lithium hydroxide, add 0.78Kg of oxalic acid, add 0.22Kg of barium hydroxide, continue stirring for 10 minutes, use a polypropylene plate Frame filter press filter, collect lithium hydroxide filtrate, stand-by;
[0028] (2) 1.8M 3 Add 1400Kg of pure water in the stainless steel reaction tower, pass into carbon dioxide (pressure is controlled at 0.17Mpa), add industrial grade lithium carbonate 60Kg, then add 0.17Kg oxalic acid, add 0.10Kg barium hydroxide, continue to pass into carbon dioxide to solution pH=8, Use a polypropylene plate and frame filter press to collect the lithium bicarbonate filtrate for use;
[0029] (3)5M 3 Add the lithium bicarbonate solution 3640Kg of step (2) and the lithium hydroxide solution 1050Kg of step (1) in the stainless steel reaction tank, stir, be heated to 60 ℃,...
Embodiment 2
[0035] (1) 5M 3 Add 4200Kg of pure water to the stainless steel dissolution tank, add 845Kg of industrial grade lithium hydroxide under stirring, stir for 30 minutes to dissolve lithium hydroxide, add 0.94Kg of oxalic acid, add 0.43Kg of barium hydroxide, continue stirring for 10 minutes, and use a polypropylene plate Frame filter press filter, collect lithium hydroxide filtrate, stand-by;
[0036] (2) 1.8M 3Add 1400Kg of pure water in the stainless steel reaction tower, pass into carbon dioxide (pressure is controlled at 0.2Mpa), add industrial grade lithium carbonate 60Kg, then add 0.11Kg oxalic acid, add 0.14Kg barium hydroxide, continue to pass into carbon dioxide to solution pH=8.5, Use a polypropylene plate and frame filter press to collect the lithium bicarbonate filtrate for use;
[0037] (3)5M 3 Add the lithium bicarbonate solution 3640Kg of step (2) and the lithium hydroxide solution 1050Kg of step (1) in the stainless steel reaction tank, stir, be heated to 65 ℃,...
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Abstract
The invention provides a preparation method for lithium carbonate. The method comprises the following steps of: (1) mixing lithium hydroxide serving as a raw material and water for dissolving, adding a precipitating agent, and collecting filtrate of the lithium hydroxide, wherein the lithium hydroxide serving as the raw material is in an industrial grade; (2) introducing carbon dioxide into water, adding lithium carbonate serving as a raw material, adding a precipitating agent, introducing carbon dioxide until the pH is between 8 and 9, and collecting filtrate of solution of lithium hydrogen carbonate, wherein the lithium carbonate serving as the raw material is in an industrial grade; (3) mixing the solution of the lithium hydrogen carbonate obtained in the step (2) and the solution of the lithium hydroxide obtained in the step (1), heating the solution, and preserving the heat; (4) separating solid from liquid of a product in the step (3), and collecting the separated lithium carbonate wet material; and (5) drying a product in the step (4) in vacuum to obtain a product. By the process, the defects of the conventional process are better overcome, the product prepared from two industrial-grade raw materials can meet the requirement on 99.9 percent or higher-grade index, and the total yield of the product is over 95 percent.
Description
technical field [0001] The invention relates to a method for preparing lithium carbonate. Background technique [0002] Lithium-ion batteries have become the main choice of rechargeable power supplies for today's portable electronic products due to their high specific energy, high power density, long cycle life, low self-discharge, and high cost performance. At the same time, in order to alleviate environmental pressure, countries around the world are competing to develop hybrid electric vehicles (HEV) that use both batteries and mechanical power. According to market forecasts in Japan, the United States and Europe, lithium-ion batteries will be the main battery for vehicles after 2010. The commercialization of lithium-ion batteries will mainly depend on performance and price. In the development process of lithium-ion batteries, the cathode material may become a bottleneck restricting its large-scale promotion and application. Therefore, the preparation of a cathode with su...
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