Leaching Mo and Ni by Direct Oxygen Pressure from Black Shale with any other only water

摘要

The hydrometallurgical process of leaching molybdenum and nickel from black shale without reagent was investigated. The extraction of Mo and Ni from molybdenum-nickel ore by oxygen pressure leaching, which exploit the characteristic of molybdenum-nickel minerals contain high concentration amorphous sulfide which has highly active, and make the most of easily oxide to sulfuric acid and sulfate at low temperature and excess oxygen presence of the amorphous sulfide. Under oxygen pressure conditions, considerable molybdenum and almost all the nickel were extracted into solution in the leaching process. The results show that with the leaching time for 3～4h, temperature at 150°C, liquid-to-solid ratio of 2mL·g~(-1), mineral granularity of 0.074mm, oxygen partial pressure of 0.4～0.5MPa without other reagent, molybdenum leaching percentage can be over 80% and nickel leaching percentage can be more than 97%. Furthermore, about 80% sulfur in the Mo-Ni ore has been transformed into sulfuric acid.