| 摘要 |
PURPOSE:To obtain lithium carbonate powder of high purity with a low content of ignition loss components by a simple and economical method, by controlling the solution temperature of a crystallization solution in obtaining the lithium carbonate powder from an aqueous solution containing an Li compound by crystallization. CONSTITUTION:An aqueous solution containing crude lithium carbonate or water-soluble Li compound is treated by recrystallization, reprecipitation, ion exchange method, etc. to give an aqueous solution containing the purified Li compound, e.g. lithium hydroxide, which is used. The resultant aqueous solution is charged into a pressure- resistant crystallization tank having an agitator, heating jacket, CO2 blowing inlet and taking outlet of lithium carbonate slurry, and then heated to >=90 deg.C solution temperature of the above-mentioned aqueous solution. CO2 in a volume of 1/2 equivalent or more based on the lithium hydroxide is continuously blown into the crystallization tank while keeping the solution temperature at >=90 deg.C to deposit the lithium carbonate as crystals. The resultant lithium carbonate is then separated and recovered from the lithium carbonate slurry, washed and dried while heating. Thus, the aimed lithium carbonate of high purity with about <=0.1wt% content of ignition loss components is obtained.
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