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中国无机分析化学:2021,11(2):80-86
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硫化铜精矿物相分析及氧化机理研究
赵伟1, 崔灯林1, 封亚辉1, 于力2
(1.南京海关工业产品检测中心;2.北矿检测技术有限公司)
Mineral phase analysis of copper sulfide concentrate and study on its oxidation mechanism
zhao wei1, cui deng-lin1, feng ya-hui1, YU Li2
(1.Industrial Product Testing Center, Nanjing Customs;2.BGRIMM MTC Technology Technical Co Ltd)
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投稿时间:2020-07-30    修订日期:2020-08-28
中文摘要: 在海轮运输及样品的制备过程中,进口硫化铜精矿氧化的现象普遍存在,使得货物的重量和铜品位发生变化,但该种现象的机理研究不多。本实验针对硫化铜精矿的物相进行分析,并对硫化铜精矿的氧化机理进行研究。首先,利用显微镜、扫描电镜、X射线荧光光谱(XRF)、X射线衍射(XRD)对两个硫化铜精矿进行物相分析,并对其中的主要元素和含铜主要物相进行定量化学分析。再次,利用热重分析(TGA)研究这两个硫化铜精矿发生氧化反应的温度,结果表明在400℃时铜精矿样品重量开始增加,在约650℃重量达到顶峰,随后重量开始下降。最后,分别在400℃、650℃和900℃对两个铜精矿样品进行灼烧,并进行XRF和XRD的分析,从而研究铜精矿的氧化机理,结果表明在400℃时,出现了铁的氧化物和铜的硫氧化物,说明黄铜矿和黄铁矿开始氧化,但还没有完全氧化,在650℃时,化合物中的氧含量继续增加,硫含量逐步减少,在900℃时,铜和铁的化合物只剩氧化物,硫已全部被氧化。结果表明,硫化铜精矿中的铜、铁等元素在温度和时间的作用下逐步氧化,硫氧化物的产生为中间态,氧化物的产生为最终态。该实验解释了进口硫化铜精矿氧化的原理,有助于贸易双方减少分歧,有助于海关技术中心更规范的制备样品,降低数据误差。
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.
文章编号:     中图分类号:    文献标志码:
基金项目:海关总署科技项目(2019HK083)
引用文本:
赵伟,崔灯林,封亚辉,于力.硫化铜精矿物相分析及氧化机理研究[J].中国无机分析化学,2021,11(2):80-86.
zhao wei,cui deng-lin,feng ya-hui,YU Li.Mineral phase analysis of copper sulfide concentrate and study on its oxidation mechanism[J].Chinese Journal of Inorganic Analytical Chemistry,2021,11(2):80-86.

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