镓锗工业生产中镓锗浸出液Fe^(2+)氧化剂选择方案探讨

Discussion on Selection of Fe^(2+) Oxidant in Gallium and Germanium Leaching Solution in Industrial Production

为了将镓锗浸出液中的Fe^(2+)氧化为Fe^(3+),采用过硫酸钠、锰矿粉和过氧化氢三种工业级氧化剂进行氧化,分别考察了氧化剂添加量、反应温度和反应时间等工艺参数对镓锗浸出液Fe^(2+)氧化率的影响。结果表明,采用工业级氧化剂过硫酸钠、锰矿粉和过氧化氢三种氧化剂氧化后,镓锗浸出液Fe^(2+)质量浓度均低于0.03 g/L,均可满足生产控制标准,Fe^(2+)的氧化率均大于99.75%。采用锰矿粉时,氧化后液在萃取中无法分相;采用工业级过氧化氢作为氧化剂的生产成本最低。综合考虑工业生产实际与生产成本,选用工业级过氧化氢作为镓锗浸出液Fe^(2+)的氧化剂较为合适,最佳氧化工艺条件为:转速500 r/min,过氧化氢按理论化学反应摩尔比4.0添加,反应温度45℃,反应时间20 min。在此条件下,镓锗浸出液Fe^(2+)的氧化率达到了99.82%。工业应用中,现场需配套相应安全储存装置和执行安全使用规范,以确保生产安全。

To oxidize Fe^(2+)in Ga and Ge leaching solution to Fe^(3+),industrial oxidants such as sodium persulfate,manganese ore powder and hydrogen peroxide were used for oxidation.The effects of oxidant addition,reaction temperature and reaction time on the oxidation rate of Fe^(2+)in Ga and Ge leaching solution were investigated respectively.The results show that the mass concentration of Fe^(2+)in Ga and Ge leaching solution oxidized by industrial oxidants sodium persulfate,manganese ore powder and hydrogen peroxide is≤0.03 g/L,which can meet the production control standard of less than 0.05 g/L,and the oxidation rate of Fe^(2+)is more than 99.75%.When manganese ore powder is used as oxidant,the oxidized solution cannot be separated during re extraction.The cost of using industrial grade hydrogen peroxide as oxidant is the lowest.According to the actual situation of industrial production and the comprehensive consideration of production cost,it is more appropriate to select industrial hydrogen peroxide as the oxidant.The optimal oxidation process conditions are:rotational speed of 500r/min,hydrogen peroxide addition amount of theoretical chemical reaction molar ratio of 4.0,reaction temperature of 45℃,and reaction time of 20 min.Under these conditions,the oxidation rate of Fe^(2+)in Ga and Ge leaching solution reached 99.82%.In industrial applications,the corresponding safety storage devices required on site and the safe use specifications shall be implemented,so as to ensure production safety.