Author(s): YANG Yong-bin, LIU Bo, LI Qian, JIANG Tao, ZENG Guan-wu
Pages: 3169-3176
Year: 2014 Issue:  12
Journal: The Chinese Journal of Nonferrous Metals
Keyword:  antimony leaching residue; oxidizing roasting; desulfurization; gold cyanidation;
Abstract: Combined with chemical composition, physical phase analysis and gold cyanidation experiment, the characteristics of gold leaching and the affecting mechanism of oxidizing roasting pretreatment were studied on an acidic antimony leaching residue. The process of acid antimony leaching?oxidizing roasting desulfurization?gold cyanidation was also investigated. The results show that being wrapped in pyrite is the primary cause for low leaching rate of gold in the acidic antimony leaching residue. Pretreated by oxidizing roasting, the contents of elemental sulfur and sulfide decrease sharply. As a result, the total sulfur content in the calcine diminishes to only 0.15% (mass fraction) and the ferrous sulfide converts into hematite. The leaching rate of gold cyanidation from the calcine increases up to 95.92%, showing a favorable increment of 24%compared with that of direct leaching from the acidic antimony leaching residue.