Abstract: 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.

Key words: Indium, Indium-bearing zinc ferrite, Zinc leaching residues, Acid leaching, Microwave, Leaching rate