南华大学学报（自然科学版）2016，Vol.30Issue(3)：30-35,43,7.
高砷含金硫精矿微波焙烧-硫代硫酸盐浸出试验研究
Study on Extraction of Au from Gold-bearing Sulfur Concentrates with High Content of Arsenic by Microwave Roasting Thiosulfate
摘要
Abstract
The leaching rate of gold by direct leaching is very low since the gold in the gold-bearing sulfur concentrates with high content of arsenic is often locked in pyrite and arseno-pyrite.It belongs to the typical refractory gold-bearing ore.In this paper,the gold-bearing sul-fur concentrates with high content of arsenic were leached by thiosulfate after the pretreat-ment of conventional roasting and microwave roasting. The S element content, XRD, SEM, specific surface area and the gold leaching rate after the pretreatment of conventional roasting and microwave roasting were analyzed and compared respectively.The results showed that the removal rate of S reached to 88.6%under the condition of 15 kW for 60 min.Though it was lower than that of the conventional roasting which reached to 94.7% under the condi-tion at 700℃ for 2 h,the energy consumption of microwave roasting was lower than that of conventional roasting.The minerals in the roasted product with microwave roasting were more one fold than that of conventional roasting. The surface morphology change of the roasted product with microwave roasting was bigger and the oxidation degree was better than that of conventional roasting. The specific surface area of the roasted product with microwave roasting was 31. 9 m2/g, it was bigger than that of the conventional roasting which was 21.8 m2/g,so the leaching effect would be better. In the matter of leaching rate, the gold leaching rate of the roasted product with microwave roasting was 73.4%,it was higher than that of the conventional roasting which was 71. 2%. In general, the effect of microwave roasting was more superior than that of the conventional roasting.关键词
硫精矿/微波焙烧金/硫代硫酸盐Key words
sulfur concentrates/microwave roasting/gold/thiosulfate分类
矿业与冶金引用本文复制引用
李峰,杨雨山,丁德馨,胡南,喻清..高砷含金硫精矿微波焙烧-硫代硫酸盐浸出试验研究[J].南华大学学报（自然科学版）,2016,30(3):30-35,43,7.基金项目
湖南省自然科学省市联合基金资助项目(12JJ8008)；核能开发科研项目 （12JJ8008）
