Energy-Saving Optimization of Lepidolite Roasting Process and Salt Precipitation Control of Lithium-Extracted Solution AITranslate

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Chinese Library Classification Number:TF826.3[冶金工程—有色金属冶金]

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The process and reaction principle of lithium extraction from lepidolite were analyzed.Thermodynamic calculation,energy consumption comparison and phase diagram analysis were carried out for the two key steps of lithium extraction process from lepidolite,namely roasting energy saving and hydrometallurgical salt precipitation.The results show that the energy consumption of ordinary tunnel kilns is slightly lower than that of ordinary rotary kilns.Considering both investment and heat exchange efficiency,hot air combustion-assisted rotary kiln process with grate cooler is the best sulfate roasting process for lithium extraction from lepidolite.Pure mirabilite can be obtained by crystallization of purified leaching solution at 0℃.Na₂SO₄·3K₂SO₄ double salt can be obtained by evaporation crystallization at 15~50℃,and the precipitated Na₂SO₄·3K₂SO₄ at 25℃is the most.Only lithium-containing mixed salt can be obtained by evaporation crystallization at 100℃.