Breaking the Fe_(3)O_(4)-wrapped copper microstructure to enhance copper-slag separation

作     者：Xiaopeng Chi Haoyu Liu Jun Xia Hang Chen Xiangtao Yu Wei Weng Shuiping Zhong Xiaopeng Chi;Haoyu Liu;Jun Xia;Hang Chen;Xiangtao Yu;Wei Weng;Shuiping Zhong

作者机构：Zijin School of Geology and MiningFuzhou UniversityFuzhou 350108China Fujian Key Laboratory of Green Extraction and High-Value Utilization of New Energy MetalsFuzhou UniversityFuzhou 350108China Zijin Mining Group Co.Ltd.Longyan 364200China Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2024年第31卷第10期

页      面：2312-2325页

核心收录：

学科分类：080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：supported by the National Natural Science Foundation of China(No.52274349) the National Key Basic Research and Development Program of China(No.2022YFC3900801) the Fujian Province University-Industry Cooperation Research Program,China(No.2023H6007) the Fujian Province Natural Science Foundation,China(No.2023J05024) 

主　　题：pyrometallurgical smelting process slag cleaning reductants copper matte 

摘      要：The precipitation of Fe_(3)O_(4)particles and the accompanied formation of Fe_(3)O_(4)-wrapped copper structure are the main obstacles to copper recovery from the molten slag during the pyrometallurgical smelting of copper ***,the commercial powdery pyrite or anthracite is replaced with pyrite-anthracite pellets as the reductants to remove a large amount of Fe_(3)O_(4)particles in the molten slag,resulting in a deep fracture in the Fe_(3)O_(4)-wrapped copper microstructure and the full exposure of the copper matte *** 1wt%composite pellet is used as the reductant,the copper matte droplets are enlarged greatly from 25μm to a size observable by the naked eye,with the copper content being enriched remarkably from 1.2wt%to 4.5wt%.Density functional theory calculation results imply that the formation of the Fe_(3)O_(4)-wrapped copper structure is due to the preferential adhesion of Cu_(2)S on the Fe_(3)O_(4)particles.X-ray photoelectron spectroscopy,Fourier transform infrared spectrometer(FTIR),and Raman spectroscopy results all reveal that the high-efficiency conver-sion of Fe_(3)O_(4)to FeO can decrease the volume fraction of the solid phase and promote the depolymerization of silicate network *** a consequence,the settling of copper matte droplets is enhanced due to the lowered slag viscosity,contributing to the high efficiency of copper-slag separation for copper *** results provide new insights into the enhanced in-situ enrichment of copper from mol-ten slag.