含富铟铁酸锌锌浸渣中铟的微波强化酸浸

常规酸浸很难高效浸出富铟铁酸锌中的铟,为了探索提高铟浸出率的低耗、高效工艺,以广西柳州锌品厂含富铟铁酸锌的锌浸渣为对象,进行了微波助浸工艺及工艺参数研究。结果表明:微波直接酸浸工艺具有简单、高效的特点,其铟浸出率明显高于常规酸浸和微波预处理+常规酸浸工艺,与微波预处理+微波酸浸工艺的铟浸出率十分接近;搅拌速度、硫酸初始浓度、液固比、浸出温度、浸出时间对铟浸出率均有显著影响;在搅拌速度为550 r/min、硫酸初始浓度为1.5 mol/L、液固比为10 mL/g、浸出温度为75℃、浸出时间为90 min情况下,对锌浸渣进行微波直接酸浸铟,铟浸出率可达77.0%,较常规酸浸铟浸出率高19.9个百分点。

Microwave Enhanced Acid Leaching of Indium from Zinc Leaching Residues Containing

School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China It is very difficult to realize indium leaching from indium-bearing zinc ferrite by the conventional acid leaching process.In order to find a process which could increase the indium leaching ratio with low energy consumption and high efficiency,the microwave leaching process and its parameters were investigated by using zinc leaching residues containing indium-bearing zinc ferrite fron Liuzhou Zinc Product Mill in Guangxi as research objective.The results showed that the microwave acid leaching was a simple and high efficient process,the indium leaching ratio of which was very close to that of microwave pretreatment + microwave leaching process,and significantly higher than that of conventional leaching and microwave pretreatment + conventional leaching process.The indium leaching ratio by microwave leaching process was significantly influenced by stirring speed,initial concentration of sulfuric acid,the ratio of liquid to solid,reaction temperature and reaction time.Indium leaching enhanced by microwave from zinc leaching residues ratio could reached to 77.0%，under the conditions of 550 r/min stirring speed，sulfuric acid initial concentration of 1.5 mol/L，ratio of liquid to solid 10 mL/g，reaction temperature of 75 ℃，reaction time for 90 min，the leaching ratio was 19.9 percentage points higher than that of the conventional leaching process.