河南某地低品位含锂粘土矿提锂新工艺研究

摘要

A low⁃grade lithium⁃bearing clay from Henan Province was taken for study. According to the mineralogical characteristics, a process of roasting followed by leaching at normal temperature was adopted in the test with the ore at size of -2 mm. Under the following optimal testing conditions:roasting at 800℃ for 2 h with calcium sulfate/ore ratio at 0.7, calcium fluoride/ore ratio at 0.2 and sodium sulfate/ore ratio at 0.2, followed by the leaching at 20℃ for 1 h with liquid⁃solid ratio at 3∶1, sulfuric acid concentration of 50%, the leaching rate of Li reached 95. 32%. Then a column leaching test was conducted with the best condition of tank leaching as reference, resulting in the leaching rate of Li up to 91.78%.%对河南某地低品位含锂粘土矿进行了试验研究。根据该矿石的工艺矿物学特性，采用原矿（－2 mm）焙烧⁃常温浸出流程，最优试验条件为：焙烧温度800℃，焙烧时间2 h，硫酸钙／原矿比0．7，氟化钙／原矿比0．2，硫酸钠／原矿比0．2，浸出时间1 h，浸出温度20℃，液固比3∶1，硫酸浓度50％，在此条件下锂浸出率为95．32％。在参考槽浸最佳条件的基础上进行了柱浸，可以获得锂浸出率为91．78％的结果。