Song Yuxia, Tang Jinyao, Wang Dawei
College of Metallurgy and Environment, Central South University, Changsha, 410083, China.
College of Life and Environmental Sciences, Central South University of Forestry and Technology, Changsha, 410004, China.
Sci Rep. 2024 Nov 7;14(1):27100. doi: 10.1038/s41598-024-76382-1.
The occurrence characteristics of arsenic in matte phase are unclear, which leads to the current treatment technology not being able to remove arsenic from matte phase significantly, thus causing a large amount of arsenic to affect smelting links such as copper converting and electrolytic refining. This paper uses instrumental analysis such as XRD, SEM-EDS, MLA and chemical analysis methods such as chemical phase extraction to comprehensively analyze the occurrence characteristics of arsenic in matte phase. The results show that the occurrence states of arsenic in matte are mainly arsenic sulfide, arsenic oxide, arsenate and residual arsenic. Most of the arsenic is in residual state in matte; arsenic in matte is extremely stable and difficult to exchange with the outside world; in high-grade matte, the arsenic content is relatively high. The main occurrence state of arsenic is copper-based complex alloy compounds, in which the arsenic content is about 1-10%. Since the metal bond between Cu-As is extremely stable, it is difficult to separate arsenic from it, which is also the key to the difficulty in completely removing arsenic from matte.
冰铜相中砷的赋存特征尚不明确，这导致目前的处理技术无法显著地从冰铜相中脱除砷，从而使得大量砷影响铜吹炼和电解精炼等熔炼环节。本文采用XRD、SEM-EDS、MLA等仪器分析方法以及化学物相萃取等化学分析方法，综合分析冰铜相中砷的赋存特征。结果表明，冰铜中砷的赋存形态主要为硫化砷、氧化砷、砷酸盐和残余砷。冰铜中大部分砷以残余态存在；冰铜中的砷极其稳定，难以与外界进行交换；在高品位冰铜中，砷含量相对较高。砷的主要赋存形态为铜基复合合金化合物，其中砷含量约为1-10%。由于Cu-As之间的金属键极其稳定，难以将砷从中分离出来，这也是冰铜中砷难以完全脱除的关键所在。
