Research on Iron Removal from Coal Gangue by Acid Leaching
Coal gangue was applied as a raw material to preparing useful materials called Sialon,however it contains iron that affects whiteness of calcined powder.To remove iron the experimental research was conducted,which involved acid leaching process using hydrochloric acid,investigating the affecting factors such as concentration of hydrochloric acid,solidliquid ratio temperature and duration of acid leaching.The result showed that under the optimum condition removal of iron could reach as high as 94.4%.