Indium-iron containing sphalerite is treated by pressure acid leaching.The influence of milling duration,oxygen pressure,reaction time,temperature,sulfuric acid initial concentration,liquidto-solid ratio and agitating speed on leaching of Zn,Fe and In were investigated.The results show that at the optimal conditions,the leaching of Zn and In are over 99% and 96%,respectively.The temperature during leaching process and residual acid concentration in the leaching solution are lower than that of traditional pr...