富锗锌精矿协同浸出锌锗工艺研究OA

The leaching of zinc and germanium from germanium-rich zinc concentrate by oxygen pressure leaching process was studied.The effects of key factors such as the initial acidity of sulfuric acid,reaction temperature,leaching time,oxygen partial pressure,sodium lignosulfonate addition amount,liquid volume to solid mass ratio,and stirring speed on the leaching rates of zinc and germanium were systematically investigated.The optimal process conditions for oxygen pressure leaching are determined through single-factor experiments as follows:leaching temperature is 160 ℃,leaching time is 150 min,initial acidity of sulfuric acid is 160 g/L,partial pressure of oxygen is 1.2 MPa,addition amount of sodium lignosulfonate is 1 g,liquid volume to solid mass ratio is 8/1,and stirring speed is 600 r/min.Under the conditions,the germanium leaching rate reaches 94.86％and the zinc leaching rate reaches 99 98％.Compared with the traditional atmospheric pressure leaching,the optimized oxygen pressure process can increase the germanium leaching rate by more than 15％,shorten the leaching time by 40％,and also avoid the emission of high-concentration H2S gas,reducing environmental pollution and providing a technical reference for the comprehensive utilization of valuable elements in zinc concentrate.