|
| Mineral phase analysis of copper sulfide concentrate and study on its oxidation mechanism |
| Received:July 30, 2020 Revised:August 28, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.3969/j.issn.2095-1035.2021.02.017 |
| KeyWord:Copper sulfide concentrate, Phase analysis, Oxidation mechanism research, Microscope, Scanning electron microscope, X-ray fluorescence spectrum, X-ray diffraction, Thermogravimetric analysis |
| Author | Institution |
| zhao wei |
南京海关工业产品检测中心 |
| cui deng-lin |
南京海关工业产品检测中心 |
| feng ya-hui |
南京海关工业产品检测中心 |
| YU Li |
北矿检测技术有限公司 |
|
| Hits: 1076 |
| Download times: 758 |
| Abstract: |
| In the process of ship transportation and sample preparation, the phenomenon of oxidation of imported copper sulfide concentrates is widespread, causing changes in the weight and copper grade of the cargo. However, the mechanism of this phenomenon has not been studied much. This experiment analyzes the phase of copper sulfide concentrate and studies the oxidation mechanism of copper sulfide concentrate. Firstly, phase analysis of the two copper sulfide concentrates was conducted using microscope, scanning electron microscope, X-ray fluorescence spectroscopy (XRF), and X-ray diffraction (XRD), and quantitative chemical analysis of the main elements and copper-containing main phases were also tested. Secondly, the thermogravimetric analysis (TGA) was used to study the temperature for the oxidation reaction of the two copper sulfide concentrates. The results showed that the weight of the copper concentrate samples began to increase at 400 ℃ and reached its peak at about 650 ℃, then the weight starts to drop. Finally, the two copper concentrate samples were burned at 400 ℃, 650 ℃ and 900 ℃, and analyzed by XRF and XRD to study the oxidation mechanism of copper concentrate. The results showed that iron oxides and copper sulfur oxides appeared at 400℃, indicating that chalcopyrite and pyrite have begun to oxidize, but have not yet been fully oxidized. At 650℃, the oxygen content in the compound continues to increase, and the sulfur content gradually decreases. At 900℃, only the oxides of the copper and iron compounds remain, and all the sulfur has been oxidized.The results show that the copper and iron in the copper sulfide concentrate are gradually oxidized under the action of temperature and time, the production of sulfur oxides is an intermediate state, and the production of oxides is a final state.This experiment explains the principle of oxidation of imported copper sulfide concentrate, helps trade parties reduce differences, helps the Customs Technical Center prepare samples more standardized, and reduces data errors. |
| Close |
|
|
|