Extracting Lithium By Precipitation Of Al(OH)₃ From Salt Lake

The paper sumerizes the application, resource of Lithium and the technique of extracting Lithium from Salt Lake. The technique of extracting Lithium from Salt Lake includes precipitation, extractation, absorption and so on.This paper focuses on precipitation of Al(OH)₃.By many experiments, the conditions of reaction of precipitation and lixiviation are optimized . The optimized conditions of reaction of precipitation are :(1) The concentration of Lithium is about 0.774 mg · L^-1.(2) The mol of Al to Li is adjusted 3.5, and need 28 g A1Cl3 · 6H2O.(3) The mol of Na to Al is adjusted 2.6, and need 150 ml 2 mol · L^-1 NaOH.(4) 150 ml 2 mol · L^-1 NaOH is added into solution during 15 min.(5) Temperature of reaction is 60 ℃.The conditions of reaction of lixiviation are :At 400℃, the precipitate is baked 20min, then Lithium is lixiviated by water. After removing the impurity, Na2CO3 is added into the lixiviated liquid, then we can get the product of Li2CO3.By the precipiting and lixiviating, we can remove the most impurity and decrease the Mg/Li.The technique is simple with high the percentage of recycled lithium, high purity of Li2CO3-So the technique is feasible.