How to choose salt lake lithium mine
2022-11-10 Xinhai (77)
2022-11-10 Xinhai (77)
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Different salt lakes correspond to different lithium enrichment and extraction processes. Lithium in salt lakes is usually extracted from old brine left over from the production of sodium and potassium. After lithium enrichment, lithium ions are extracted into lithium carbonate after evaporation, demagnetization and concentration.
Salt lakes correspond to different lithium enrichment and lithium extraction processes due to different brine concentrations. The calcination method has high requirements on raw materials, and the lithium concentration in the brine must reach 8-9g/L. This extraction method is suitable for high magnesium and high lithium brine resources (generally required to reach 2g/L).
The precipitation method requires that the lithium ion mass concentration in the salt lake is greater than 0.5g/L, and the lithium content in the salt lake brine is greater than 1g/L when the magnesium-lithium weight ratio is 1～200/1. The lithium ion mass concentration is greater than 0.5g/L, and the adsorption method is suitable for 0.1g/L saline
At present, there are seven methods for extracting lithium from salt lakes, among which adsorption method and electrodialysis method are the most widely used.
At present, the main salt lake brine extraction technologies used in the world include precipitation method (including carbonate precipitation method, aluminate precipitation method, hydrated lithium sulfate crystallization precipitation method, boron-magnesium-boron-lithium co-precipitation method), calcination leaching method, carbonization method, Solvent extraction, adsorption, electrodialysis, membrane separation, etc. Among them, the solvent extraction method has not yet achieved large-scale industrial application.
Membrane methods mainly include electrodialysis and nanofiltration membrane separation.
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