Study on the mechanical activation of malachite and the leaching of complex copper ore in the Luanshya mining area, Zambia  

作　　者：Gai-rong Wang Hong-ying Yang Yuan-yuan Liu Lin-lin Tong Ali Auwalu 

机构地区：[1]Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Northeastern University,Shenyang 110819,China [2]School of Metallurgy,Northeastern University,Shenyang 110819,China [3]CNMC Luanshya Copper Mines Plc(CLM),Independence Avenue,Luanshya City 90456,Zambia

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第3期292-300,共9页矿物冶金与材料学报（英文版）

基　　金：financially supported by the Special Funds for the National Natural Science Foundation of China(No.U1608254);the National Key R&D Program of China(No.2018YFC1902002)

摘　　要：Mechanical activation(MA) of malachite was carried out by dry planetary grinding(DPG) and wet Isa grinding(WIG) methods. When the rotational speed was increased to 400 r/min in DPG, the specific surface area of malachite reached the maximum and the particle size reached the minimum of 0.7–100 μm. Agglomeration occurred between mineral particles when the rotational speed was increased to 580 r/min in DPG.However, no agglomeration was observed among particles with sizes 0.4–3 μm in WIG. X-ray diffraction analysis showed that, at a 580 r/min rotational speed in DPG, the amorphization degree of malachite was 53.12%, whereas that in WIG was 71.40%, indicating that MA led to amorphization and distortion of crystal structures. In addition, in the Fourier transform infrared(FT-IR) spectra of activated malachite, the bands associated with –OH, CO_3^(2-)and metal lattice vibrations of Cu–O and Cu–OH were weakened, and a new H–O–H bending mode and peaks of gaseous CO_2 appeared, indicating that MA decreased the band energy, enhanced dihydroxylation, and increased the chemical reactivity of the malachite.Furthermore, the leaching behavior of copper ore was greatly improved by MA.Mechanical activation（MA） of malachite was carried out by dry planetary grinding（DPG） and wet Isa grinding（WIG） methods. When the rotational speed was increased to 400 r/min in DPG, the specific surface area of malachite reached the maximum and the particle size reached the minimum of 0.7–100 μm. Agglomeration occurred between mineral particles when the rotational speed was increased to 580 r/min in DPG.However, no agglomeration was observed among particles with sizes 0.4–3 μm in WIG. X-ray diffraction analysis showed that, at a 580 r/min rotational speed in DPG, the amorphization degree of malachite was 53.12%, whereas that in WIG was 71.40%, indicating that MA led to amorphization and distortion of crystal structures. In addition, in the Fourier transform infrared（FT-IR） spectra of activated malachite, the bands associated with –OH, CO32-and metal lattice vibrations of Cu–O and Cu–OH were weakened, and a new H–O–H bending mode and peaks of gaseous CO2 appeared, indicating that MA decreased the band energy, enhanced dihydroxylation, and increased the chemical reactivity of the malachite.Furthermore, the leaching behavior of copper ore was greatly improved by MA.

关 键 词：MALACHITE mechanical activation crystal structure copper ore Zambia 

分 类 号：TF811[冶金工程—有色金属冶金]