Abstract:There are few indium of rare metal independent deposits . Without independent field，pittance of indium is mixed with zinc , indium is enriched in a variety of slag during wet or fire zinc smelting. The presence of indium ferrite and other refractory materials makes the the processes to extract indium from residues have long periods and low recovery rates.This paper focuses on the leaching of indium from solid waste zinc. Conventional acid leaching materials have few applicable range and low recovery rate, while for refractory minerals, pressure oxygen-rich acid leaching, hot acid leaching, roasting pretreatment, chlorine leaching are required.Indium sulphide was converted into indium sulphate by zinc slag roasting, and the structure of indium silicate was also destroyed,the leaching rate of indium was more than 93%.The use of composite field to enhance indium leaching has great application potential.The traditional extraction process is more complicated, the later operation is not easy to control, and the separation of ion is difficult. The new leaching follow-up process is adopted, including the neutralization of limestone and hydrolysis precipitation, the hydrolysis of indium, ion exchange resin, bioleaching and vacuum distillation to further enrich indium.Therefore, in the future, the auxiliary use of composite field or combination of multiple methods from the internal destruction of insoluble structure to achieve indium iron separation and indium zinc ferrite dissolution, zinc solid waste indium extraction technology innovation, research and development of new extractants can become the future development direction.