Abstract
Sulfate roasting and dilute sulphuric acid leaching were applied to extract lithium from lepidolite. Several conditions including roasting temperature, roasting time, K2SO4and CaO were investigated to improve the lithium extraction efficiency, the final lithium extraction efficiency could attain 94% with the conditions as follows: roasting temperature 850°C, roasting time 2 h, K2SO4to lepidolite mass ratio 0.15 and CaO to lepidolite mass ratio 0.75.
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