Separation of Lithium and Aluminum in Leaching Solution of Clay-Type Lithium Ore by Calcination and Water Leaching
According to the characteristics of high-content aluminum and low-content lithium in hydrochloric acid leaching solution of a clay-type lithium ore in Hubei Province,lithium and aluminum were firstly separated by adopting calcination at 390℃for 2.0 h.Then,the calcined residue,without grinding,was leached at 90℃for 1 h with water in a volume ratio of 3∶1.After the leaching process,the leaching rate of lithium reached 93.85%,and no aluminum was detected in leaching solution,indicating a good Li-Al separation result.An analysis of chemical composition of calcined residue and leaching residue show that after water leaching,the main metal elements in the calcined residue,such as lithium,kalium,sodium,calcium and magnesium,all are leached into the lixivium,and the main composition of leaching residue are alumina and iron oxide.
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