Abstract
Carbonaceous gold concentrates were pretreated using a reduction roasting method. The roasting process was investigated by thermogravimetry-mass spectrometry and X-ray diffraction. The characteristics of the thermal reaction process and gas release, and the removal mechanism for pyrite and organic carbon were analyzed. Results showed that the thermal decomposition and reduction reactions caused the highest weight loss. The main gold-locked mineral of pyrite was eliminated by decomposition and reduction reaction to produce FeS and S2. The “preg-robbing” ability of organic carbon was eliminated by thermal decomposition to converted into graphite. After reduction roasting, exposed gold content increased from 34.65% to 83.25%, organic carbon removal rate was 98.38%, and the gold leaching rate increased significantly from 2.43% to 73.7%. The technology solved the gold locking and “preg-robbing” problems of organic carbon, prevented the production of SO2, which realized a highly efficient and clean pretreatment for carbonaceous gold concentrates.
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