锂云母精矿的硫酸熟化研究

Study on Sulfuric Acid Curing of Lepidolite Concentrate

硫酸熟化过程是硫酸法处理锂云母精矿的关键,关系到锂、铷、铯的综合利用。采用L_(16)(4~5)正交试验研究了锂云母精矿的硫酸熟化过程。结果表明,影响锂云母硫酸熟化的因素主次顺序是:酸矿比>硫酸浓度>熟化时间>熟化温度>给料粒度。硫酸熟化的最优条件为:酸矿比1∶1、硫酸质量浓度80%、熟化时间4 h、熟化温度150℃、给料粒度74μm以下占80%,在此条件下锂、铷、铯的浸出率分别为97.58%、96.73%和97.39%,有助于锂云母中锂、铷、铯的综合回收。

The sulfuric acid curing process of the sulfuric acid method treating lepidolite concentrate,which is the key factor on comprehensive utilization of lithium,rubidium and cesium,was investigated by using L 16(4 5)orthogonal experimental design.The results showed that the importance of the factors affecting the sulfuric acid curing of lepidolite was:acid-solid ratio>sulfuric acid concentration>curing duration>curing temperature>particle size.The optimum curing parameters were determined as follows:acid-solid ratio of 1 GA6FA 1,sulfuric acid concentration of 80%,curing duration of 4 hours,curing temperature of 150℃,particle size of 80%below 74μm.Under the optimal conditions,the leaching efficiencies of lithium,rubidium and cesium were 97.58%,96.73%and 97.39%,respectively.The study can provide reference for sulfuric acid method of treating the lepidolite ore,which lays the foundation for the comprehensive utilization of lithium,rubidium and cesium in the lepidolite ore.