CAS Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shanxi 710075, China.
School of Resource and Environmental Engineering, Anhui University, Hefei 230601, China.
J Hazard Mater. 2021 Jan 5;401:123293. doi: 10.1016/j.jhazmat.2020.123293. Epub 2020 Jun 23.
Separating copper and arsenic has always been a major problem in the copper slag flotation process, which influences copper slag utilization and the environmental safety. A comparative study of flash smelting furnace (FSF) slag and its flotation products (concentrate and tailing) reveals the factors affecting the separation of copper and arsenic in the beneficiation process from the perspective of mineralogy and morphology. The elemental fractionation in the process shows a positive correlation of As, Cu and Cd and an obvious correlation between speciation transformation of copper and arsenic was observed. The occurrence of arsenic and copper in FSF slag correlate the key phases of arsenic copper alloys, accounted for 88.91 % of total arsenic-bearing phases and 32.28% of copper-bearing phases. Closely-embeded matte and copper-arsenic alloys incerease the difficulty of the separation suggesting the finer grinding is needed for slag. Arsenic is liberated and oxidized into arsenate compounds while the recombination of As-O and Cu-S happened in the process affecting the selectivity of copper and arsenic. Arsenic fixed in silicate minerals is discharged into tailing which suggested to induce and fix arsenic into silicate minerals can facilitate arsenic removal from concentrate. FSF slag and its flotation concnetrate show risks of some of some of HMs which should be cautiously transported, disposed, and utilized.
铜和砷的分离一直是铜渣浮选过程中的一个主要问题，这影响了铜渣的利用和环境安全。对闪速熔炼炉（FSF）炉渣及其浮选产品（精矿和尾矿）的比较研究从矿物学和形态学的角度揭示了影响选矿过程中铜和砷分离的因素。该过程中的元素分馏与 As、Cu 和 Cd 呈正相关，并且观察到铜和砷的形态转化之间存在明显的相关性。砷和铜在 FSF 炉渣中的存在与砷铜合金的关键相相关，占总含砷相的 88.91%和含铜相的 32.28%。紧密嵌入的冰铜和铜砷合金增加了分离的难度，表明需要对炉渣进行更细的研磨。砷在浮选过程中被释放并氧化成砷酸盐化合物，同时发生 As-O 和 Cu-S 的重组，影响了铜和砷的选择性。固定在硅酸盐矿物中的砷被排入尾矿中，这表明诱导和固定砷进入硅酸盐矿物可以促进从精矿中去除砷。FSF 炉渣及其浮选精矿显示出一些重金属的风险，这些重金属在运输、处置和利用时应谨慎对待。
