关键词: 铟, 锌, 锌渣氧粉, 加压氧化, 浸出

Abstract: In the reaction of indium-bearing zinc oxide flue dust (ZOFD) with industrial sulfuric acid by oxidative pressure leaching in an autoclave，the effects of different technological conditions，such as initial concentration of sulfuric acid，reaction time，temperature and the dosage of oxidant，on leaching efficiency of indium and zinc were studied.The experimental results showed that the extraction of indium from ZOFD can be enhanced effectively by both pressuring and using potassium permanganate as oxidant.The optimum conditions of pressure leaching were determined as 400 g/L sulfuric acid for 120 min at 120 °C with the dosage of KMnO4 was 4% (wt.% ) of ZOFD.The leaching rate of indium can reach 90.6% under these optimum conditions.Simultaneously，the process of oxidative pressure leaching could also strengthen the zinc extraction from ZOFD，but the effect was not obvious.

Key words: Indium, Zinc, Zinc oxide flue dust, Oxidative pressure, Leaching