SULFIDATION OF CHALCOPYRITE WITH GASEOUS SULFUR

摘要

The reaction of chalcopyrite with gaseous sulfur has been investigated in the range 350-450 deg C in order to transform this mineral into a ore acid soluble copper sulfide and insoluble iron sulfide. The results of thermodynamic analysis of this system as well as the X-ray diffraction analysis of the reaction products showed that in the temperature range 350 400 deg C the sulfidation reaction proceeded without formation of intermediate copper-iron sulfides according to: CuFeS_2+1/2S_2(g)=CuS+FeS_2 The effects of temperature and time on the conversion of chalcopyrite were studied. Conversion of chalcopyrite reached about 80 percent very rapidly with increase in temperature up to about 400 deg C. The recovery of copper from the sulfidized samples was determined by leaching in oxygenated 1.2M H_2SO_4, 2M NaCl solution. Copper recoveries over 90 percent were obtained from samples sulfidized for 30 min at temperatures lower than 400 deg C.