碱性焙烧再次沉矾法回收黄铁矾渣中的铟

Recovery of Indium from Iron-Vanadium Slag by Alkaline Roasting and Secondary Alum Process

从湿法炼锌的富铟铁钒渣中回收海绵铟。将黄铁矾渣碱性焙烧、稀酸浸出、再次沉矾、二次铁矾渣经焙烧、酸浸、还原可得海绵铟。主要考察了铁钒渣650℃焙烧时的碱渣配比、焙烧时间,焙烧渣浸出温度和再次沉矾时间等因素的影响。结果表明,碳酸钠和黄铁矾渣的质量比为0.36,焙烧90 min后,用1 mol/L稀硫酸在85℃下浸取150 min,浸出液在90℃下经14 h再次沉矾,铟含量可提高23倍。二次矾渣600℃焙烧后用1.0 mol/L稀盐酸浸出,浸出液直接用铝板置换,可得到93%以上的海绵铟,铟的直收率85%。

Sponge indium was recovered from indium rich iron vanadium slag which is the slag from zinc hydrometallurgy.The methods include alkaline roasting,leaching,precipitation of jarosite again,twice jarositic slag roasting,acid leaching followed by the reduction.The influence of ratio of soda residue,toasting time,leaching temperature and precipitation time of jarosite again were discussed when iron vanadium slag was roasted at 650℃.Results show that indium was achieved through optimized conditions which are ration of sodium carbonate and vanadium slag 0.36,90 minutes roasting time,150 min leaching time at 85℃using 1 mol/L dilue sulphuric aid and precipitation of jarosite 14 h leaching time at 90℃.The content of indium was improved 23 times than before.The second vanadium slag was roasted at 600℃followed by being leached out in 1.0 mol/L hydrochloric acid,then the solution was replaced by aluminum board.The final product of sponge indium was 93%and the direct recovery yield was 85%.