Research on Ammonia-Ammonium Chloride Leaching of a High Alkaline Zinc Oxide Ore
The leaching of a high alkaline zinc oxide ore was studied in ammonia-ammonium chloride solution.The influence of technical parameters including ammonia concentration,the ratio of liquid to solid,reaction time and temperature on leaching rate was studied and the relevant leaching process was analyzed.The optimum condition was found to be: the molar concentration ratio of ammonia to ammonium chloride is 1:1,the ammonia concentration is 5mol/L,the ratio of liquid to solid is 3:1,the leaching time is 2h and the leaching temperature is 40℃.The leaching ratio of zinc is 89.3% under that condition.