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Interface behavior of chalcopyrite during flotation from cyanide tailings

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International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 439-445页

作者： Xuemin Qiu Hongying Yang Guobao Chen Linlin Tong Zhenan Jin Qin Zhang Key Laboratory for Ecological Utilization of Multi-metallic Mineral Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

The interface characteristics of cyanide tailings are different from those of the raw ore. In this study, valuable elements could not be thoroughly recovered via the flotation of cyanide tailings from Shandong, China. The interface and floatability of these tailings were investig- ated by phase analysis and flotation tests. The chalcopyrite in the cyanide tailings was fine and had a porous surface. The floatability of 68% chalcopyrite was similar to that of galena in the presence of a collector. A layer of fine galena particles compactly wrapped the chalcopyrite. The chalcopyrite recovery sharply decreased as the nonpolar oil residue in cyanide tailings was extracted using alcohol;however, this removal had no effect on the galena. The remaining chalcopyrite in the flotation tailings was covered with an oxidation layer consisting of O, Fe, S, Pb, Cu, Zn, and Si.

关键词： cyanide tailings interface behavior chalcopyrite flotation surface wrapped layer

Fe extraction from high-silicon and aluminum cyanide tailings by pretreatment of water leaching before magnetic separation

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Transactions of Nonferrous Metals Society of China 2013年第4期23卷 1165-1173页

作者：张亚莉李怀梅于先进山东理工大学化学工程学院淄博255081

Pretreatment of high content of Si- and Al-containing cyanide tailings by water leaching to remove some impurities, such as the major impurities minerals of Si and A1, as well as its effect on Fe extraction in the water leaching process was investigated. The effects of different parameters on iron recovery were studied, and the reaction parameters were proposed as follows： sodium carbonate content of 30%, water leaching at 60 ~C for 5 min, liquid/solid ratio of 15：1, and exciting current of 2 A. Under these optimal conditions, magnetic concentrate containing 59.11% total iron and a total iron recovery rate of 76.12% was obtained. In addition, the microstructure and phase transformation of the process of water leaching were studied by X-ray powder diffraction technique （XRD）, Electronic image of backscattering （BEI）, X-ray fluorescence （XRF）, and energy dispersive spectrometry （EDS）. The results indicate that the soluble compound impurities generated in the roasting process are washed out, and the dissoluble substances enter into nonmagnetic materials by water leaching, realizing the effective separation of impurities and Fe.

关键词： water leaching cyanide tailings grade of magnetic concentrate recovery rate of iron yield of magnetic concentrate

High-temperature chlorination of gold with transformation of iron phase

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Rare Metals 2016年第11期35卷 881-886页

作者： Zheng-Yao Li Wei-Wei Wang Kun Yue Ming-Xing Chen School of Civil and Environmental Engineering University of Science and Technology Beijing

Gold in cyanide tailings from Shandong Province is mainly encapsulated by hematite and magnetite at distribution rates of 76.49 % and 10.88 %, ***-reduction one-step roasting of cyanide tailings was conducted under the following conditions： calcium chloride dosage of 6 %, bituminous coal dosage of 30 %, calcium oxide dosage of 10 %（all dosages are *** mass of cyanide tailings） at 1000 ℃ of roasting temperature. X-ray diffraction（XRD）, scanning electron microscopy（SEM）, and chemical-phase analysis were performed to investigate the effects of iron phase transformation on the high-temperature chlorination of *** indicate that the lattice structure of hematite undergoes expansion, pulverization, and reorganization when hematite is reduced to magnetite, which leads to42.03 % gold exposure, and the high-temperature chlorination rate of gold is 41.17 % at the same time. The structure of wustite formed by the reduction in magnetite is porous and loose, and thus 44.02 % of gold is exposed. The high-temperature chlorination rate of gold is increased by41.98 percentage points. When wustite is reduced to metallic iron, 4.42 % of gold is exposed, and the hightemperature chlorination rate of gold is increased by3.38 percentage points. Accordingly, the high-temperature chlorination of gold mainly occurs in two stages, in which Fe_2O_3 is reduced to Fe_3O_4, and Fe_3O_4 is reduced to Fe_xO finally.

关键词： cyanide tailings Chlorination-reduction one-step roasting Transformation of iron phase Gold