Research on the Leaching Process Conditions of a Clay-Type Lithium Ore in Yibin
For the clay-type lithium ore with a Li2O grade of 1.19%mined from a certain place in Yibin,using the sulfuric acid leaching method,the effects of leaching temperature,leaching time,sulfuric acid concentration and liquid-solid ratio on the leaching rate of lithium were studied.At the same time,the experiment was improved and optimized with the roasting process and organic acids.The results showed that the leaching rate of the clay-type lithium ore was affected by the process conditions and the effect of leaching temperature was the largest,followed by sulfuric acid concentration,leaching time and liquid-solid ratio.When the leaching temperature was 150℃,the leaching time was 90min,the volume fraction of sulfuric acid was 50%and the liquid-solid ratio L/S=100(mL·g-1),the leaching effect was good and the leaching rate of lithium was 65.08%.In order to increase the leaching rate further,this clay-type lithium ore was roasted at 700℃for 30 min,at this time,the leaching rate of roasted lithium could be increased to 79.79%.From the perspective of green environmental protection and reducing equipment requirements,the experiment showed that the leaching rate of roasted lithium was 61.20%when the mass fraction of oxalic acid was 50%using organic acids instead of sulfuric acid.Oxalic acid had a great potential to be a green and environmentally friendly leaching agent for clay lithium extraction in the future through process improvement and continued research.
万方数据
维普
