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Extraction of metals from complex sulfide nickel concentrates by low-temperature chlorination roasting and water leaching 被引量:8
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作者 Cong Xu Hong-wei Cheng +4 位作者 Guang-shi Li Chang-yuan Lu Xiong-gang Lu Xing-li Zou Qian Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2017年第4期377-385,共9页
The recovery of valuable metals from complex sulfide concentrates was investigated via chlorination roasting followed by water leaching. A reaction process is proposed on the basis of previous studies and the results ... The recovery of valuable metals from complex sulfide concentrates was investigated via chlorination roasting followed by water leaching. A reaction process is proposed on the basis of previous studies and the results of our preliminary experiments. During the process, various process parameters were studied, including the roasting temperature, the addition of NH4Cl, the roasting time, the leaching time, and the liquid-to-solid ratio. The roasted products and leach residues were characterized by X-ray diffraction and vibrational spectroscopy. Under the optimum condition, 95% of Ni, 98% of Cu, and 88% of Co were recovered. In addition, the removal of iron was studied in the water leaching stage. The results demonstrate that this process provides an effective approach for extracting multiple metals from complex concentrates or ores. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg. 展开更多
关键词 CALCINATION chemicals removal (water treatment) CHLORINATION LEACHING Metal recovery Nickel Rare earths Sulfur compounds Temperature X ray diffraction
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Application of Ce(IV) in industrial wastewater treatment
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作者 赵建军 李炳伟 +1 位作者 杨晨轩 饶向东 《Journal of Rare Earths》 SCIE EI CAS CSCD 2010年第S1期37-39,共3页
At present,rare earth application in wastewater treatment has become more and more widely,according to the fact that the Ce(IV) has the strong oxidation ability under acid condition,we have studied the application of ... At present,rare earth application in wastewater treatment has become more and more widely,according to the fact that the Ce(IV) has the strong oxidation ability under acid condition,we have studied the application of Ce(IV) in industrial wastewater treatment originally.Results showed that oxidation-reduction reaction occurred between Ce(IV) and the organic compounds or other reducing substances in industrial wastewater,thereby the colority and CODcr reduced effectively.Ce(IV) formed [Ce(OH)x·nH2O](4-x)+ after hydrolyzation and Ce(III) obtained after Ce(IV) reduction formed [Ce(OH)x·nH2O](3-x)+ after hydrolyzation,these hydrate had big specific surface area,could adsorb the suspension substances and removed toxic or harmful ions in industrial wastewater.After treatment by Ce(IV),the analytical results of industrial wastewater are as follows:The CODcr became 58 mg/L from 1646 mg/L,the total COD removal efficiency was more than 95.0%.Turbidity reduced to no more than 10NTU from 87NTU.The chroma became 6 degree from 26 degree,suspension substances content decreased to no more than 2 mg/L from 36 mg/L,and total arsenic and fluorion became 【0.05 mg/L and 【0.10 mg/L from 0.60 and 15.3 mg/L.Total cadmium reduced to 0.01 mg/L from the 0.58 mg/L.These all indicated that Ce(IV) was one kind of latent good water treatment chemical. 展开更多
关键词 wastewater treatment CE(IV) CODCR water treatment chemical rare earths
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