Method and system for preparing high-purity lithium carbonate

Abstract

The present invention disclosed the preparation method and system of high -purity lithium carbonate.The preparation method of high -purity lithium carbonate, including the following steps: condense carbonate salt lake brine, then heat up the crystallization of the carbonate, collect crystallization to get lithium carbonate salt;Lithium carbonate refined salt, dissolved in the sodium and potassium salt;The invention process does not need to use chemical reagents. It can complete the purity of lithium carbonate through physical operations. The purity of lithium carbonate is as high as 95%or more, which will help reduce the cost of later transportation to further purify the cost.The invention technology has extremely low requirements for transportation and does not pollute the environment.

Description

technical field [0001] The invention relates to a process and system for purifying lithium carbonate. Background technique [0002] Due to its strong electrochemical activity and being a light metal, lithium has a wide range of uses. At present, the application fields of lithium include: ceramics and glass, synthetic rubber, aluminum production, plastics, pharmaceuticals, lubricants, air conditioners, televisions (fluorescent screens), lithium batteries, lithium alloys and nuclear industry, etc.; consumption reaches tens of thousands of tons per year , and still growing. [0003] In the world's total lithium resources, brine lithium ore accounts for about 75%, and hard rock lithium ore accounts for 25%. In my country's total lithium resources, brine lithium ore accounts for about 72%, and hard rock lithium ore accounts for 28%. Before the 1960s, lithium resources mainly came from hard salt lithium ore. The cost of extracting lithium from salt lakes is 1-1.5 times lower th...

AI Technical Summary

Problems solved by technology

[0006]1. It is necessary to build a large area of ​​salt pan, and the construction cost and later maintenance cost are quite high; at the same time, artificially increased the additional production of the salt lake, destroying the liquid level balance of the salt lake, which may Affect the ecology of the salt lake area;

[0007]2. It is greatly affected by natural conditions;

[0008]3. The prepared lithium salt has low purity and many impurities, and needs to be transported to the factory for further processing; thus, the transportation cost is very high; and most of them are transported impurities "Useless carriage";

[0009]4. It takes a long time to make salt; the process cannot be automated and the efficiency is low

[0010]In addition, the existing salt lakes are basically located in remote areas, with inconvenient transportation, lack of energy and fresh water, which further increases the difficulty of purification

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