Behavior And Mechanisms Of Antimony And Sulfur In The Gold-antimony At Different Atmospheres

Gold-antimony mine resources are distributed in Hunan and Jiangxi, Gansu, Qinghai, Tibet, Guangxi in our country. Especially in recent years, many such new deposits had been discovered in the west regions of China, in which arsenopyrite associates with pyrite. The gold ore combines with metal sulfide closely, and mainly in particles are distributed in antimonite, pyrite and arsenopyrite. After mineral separation, gold and antimony still cannot be completely separated, generally have to be smelted and separated.In order to utilize the resources effectively, to majorize the existing process, the study of the volatilization behavior of the gold-antimony concentrate is very important. This thesis uses the gold-antimony concentratio from Xiangxi gold mine as the research object. By using thermodynamical knowledge, advanced X-ray diffraction, electron microscope scanning and electron probe etal, characters of the calcine and the volatile matter are analyzed. The volatilization law and the mechanism of gold concentrate are researched in the oxidizing atmosphere, the reducing atmosphere and the neutral atmosphere.By comparing the volatilization law of the antimony-gold concentrate in three atmospheres, It can be found that the volatilization of the antimony-gold concentrate in the neutral and the reducing atmospheres is not as strong as that in oxidizing atmosphere at the low temperature. But the volatilization of the antimony-gold concentrate in the neutral and the reducing atmospheres is stronger than that in oxidizing atmosphere at the high temperature. The volatilization ratio of the antimony-gold concentratio in the neutral and the reducing atmospheres are similar. Through analysing results of the products roasted in three atmospheres, one layer of several kinds of complex antimony compound can be found in oxidizing atmosphere. The chemical property of the complex antimony compounds is stabile. At high temperature, these complex antimony compounds do not easily volatilize and not decompose and hinder volatilization of antimony and oxidation of the sulfur. In the reducing atmosphere, because carbon monoxide can reacts with antimony sulfide, the result is that the metal antimony of worse volatilization generates as well as the COS in this reaction. As a result, the residual of antimony in the calcine in reducing atmosphere is higher than that in neutral atmosphere. But the residual of the sulfur in the reducing atmosphere is lower than that in the neutral atmosphere. The residual of the sulfur in the reducing and neutral atmosphere is higher than that in oxidizing atmosphere, mainly because of the existence of sulfide not including antimony sulfide which does not volatilize. In the oxidizing atmosphere, the residual of the sulfur in the calcine has a peak at the temperature between 800℃and 900℃, which is caused by the fast generation of antimony complex compounds. The volatilization forms of the gold-antimony concentrate powder and the block are the same as well as the volatilization law. As the result of the difference of the void ratio between the fine ore and the block, the volatilization of the fine ore is stronger than that of the block.