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

International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2312-2325页

作者： Xiaopeng Chi Haoyu Liu Jun Xia Hang Chen Xiangtao Yu Wei Weng Shuiping Zhong Zijin School of Geology and Mining Fuzhou UniversityFuzhou 350108China Fujian Key Laboratory of Green Extraction and High-Value Utilization of New Energy Metals Fuzhou UniversityFuzhou 350108China Zijin Mining Group Co. Ltd.Longyan 364200China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

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.

关键词： pyrometallurgical smelting process slag cleaning reductants copper matte

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Reductive leaching of low-grade manganese ore with pre-processed cornstalk

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International Journal of Minerals,Metallurgy and Materials 2015年第12期22卷 1245-1251页

作者： Ai-fei Yi Meng-ni Wu Peng-wei Liu Ya-li Feng Hao-ran Li School of Civil and Environment Engineering University of Science and Technology Beijing State Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education) State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences

Cornstalk is usually directly used as a reductant in reduetive leaching manganese. However, low utilization of cornstalk makes low manganese dissolution ratio, In the research, pretreatment for cornstalk was proposed to improve manganese dissolution ratio. Cornstalk was preprocessed by a heated sulfuric acid solution （1.2 M of sulfuric acid concentration） for 10 min at 80℃. Thereafter, both the pretreated solution and the residue were used as a reductant for manganese leaching. This method not only exhibited superior activity for hydrolyzing cornstalk but also enhanced manganese dissolution. These effects were attributed to an increase in the amount of reductive sugars resulting from lignin hydrolysis. Through acid pretreatment for cornstalk, the manganese dissolution ratio was improved from 50.14% to 83.46%. The present work demonstrates for the first time the effective acid pretreatment of cornstalk to provide a cost-effective reductant for manganese leaching.

关键词： manganese ore treatment cornstalk reductants leaching

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