Usually there are two ways to prepare lithium carbonate in the industry.
1: Lime sintering method: using spodumene Li2O.Al2O3.4SiO2 and lime CaO and Ca(OH)2 in a ratio of 1:2.5---3, high temperature calcination to form lithium metaaluminate, and then calcium hydroxide Conversion to calcium metaaluminate precipitation, and release lithium hydroxide dissolved in water, and then filtered to obtain lithium hydroxide solution, and concentrated, and then added sodium carbonate solution to obtain lithium carbonate precipitation, filtration, washing, and drying to obtain lithium carbonate Crystals.
2: Comprehensive utilization method of brine: After the brine is removed, a relatively pure lithium chloride solution is obtained, and then a sodium carbonate solution is added to obtain a lithium carbonate precipitate, which is filtered, washed, and dried to obtain a crystal of lithium carbonate.
The most commonly used lithium soluble compounds are lithium chloride and lithium hydroxide. Lithium sulphat is a downstream product of lithium compounds. It is more expensive and less used in industrial raw materials. Although it can also produce lithium carbonate, it is generally not used. Production of lithium carbonate, because natural minerals should not have Lithium sulphat, and lithium chloride and lithium hydroxide are significantly cheaper than Lithium sulphat, from the price of analytically pure reagents is enough to see,
In addition, Lithium sulphat and sodium carbonate react to obtain lithium carbonate precipitation, and also obtain sodium sulfate decahydrate crystal which is not very soluble at normal temperature and low temperature. If the concentration is not well grasped, it is easy to be doped in lithium carbonate precipitation, and the purity of the product may be Affected.