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Flotation behavior and mechanism of rutile with nonyl hydroxamic acid

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Rare Metals 2016年第5期35卷 419-424页

作者： Jun Wang Hong-Wei Cheng Hong-Bo Zhao Wen-Qing Qin guan-zhou qiu School of Minerals Processing and Bioengineering Central South University

The flotation and surface interaction of rutile with nonyl hydroxamic acid were investigated in this work. The results show that the adsorption density and flotation recovery of rutile have similar tendency, especially the maximum recovery and adsorption occur at pH about 7.5. In terms of Fourier transform infrared（FTIR） spectroscopic analysis, chemical adsorption is identified on the surface of rutile, where a chelate of O,O-five-membered rings with Ti^4＋ on the surface of rutile may form. Adsorption measurements, Zeta potential test, IR spectrum analyses, and solution chemistry calculations illustrate that the adsorption on the rutile surface involves both physical and chemical adsorption, while chemical adsorption is dominant.

关键词： Rutile Flotation Nonyl hydroxamic acid Chelate

Mechanism of vanadic titanomagnetite solid-state reduction

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Rare Metals 2020年第11期39卷 1348-1352页

作者： Shui-Shi Liu Yu-Feng Guo guan-zhou qiu Tao Jiang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083China

The influence mechanism of vanadic titanomagnetite solid-state reduction was studied in this *** microscopy(OM),scanning electron microscope(SEM),and X-ray diffraction(XRD)were used to characterize the structure and phases of the *** results show that the dense structure is not the reason that limits the reducibility of Panxi vanadic *** rate of 93%was achieved when it was reduced at 1100℃for 100 *** pre-oxidation,Fe_(9)TiO_(15)and Fe_(2)O_(3)are the main phases of ***-oxidation could destroy the dense structure of vanadic titanomagnetite and increase the specific surface area of ***,reducibility of vanadic titanomagnetite is not improved obviously by pre-oxidation,with metallization rate increasing only 1%under the same reduction conditions,and the generated metallic iron grains are *** transformation of vanadic titanomagnetite at different reduction temperatures shows that the presence of FeTi_(2)O_(5)is the main reason that limits the reducibility of Panxi vanadic titanomagnetite.

关键词： Vanadic titanomagnetite Pre-oxidation Solid-state reduction Reduction process

Reduction roasting–magnetic separation of vanadium tailings in presence of sodium sulfate and its mechanisms

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Rare Metals 2016年第12期35卷 954-960页

作者： Yu-Lei Sui Yu-Feng Guo Andrew Yakovlevich Travyanov Tao Jiang Feng Chen guan-zhou qiu School of Minerals Processing and Bioengineering Central South University Institute of Environmental Technology and Engineering National University of Science and Technology ‘‘MISi S’’

Reduction roasting with sodium sulfate fol- lowed by magnetic separation was investigated to utilize vanadium tailings with total iron grade of 54.90 wt% and TiO2 content of 17.40 wt%. The results show that after reduction roasting-magnetic separation with sodium sul- fate dosage of 2 wt% at roasting temperature of 1150℃ for roasting time of 120 min, metallic iron concentrate with total iron grade of 90.20 wt%, iron recovery rate of 97.56 % and TiO2 content of 4.85 wt% is obtained and high-titanium slag with TiO2 content of 57.31 wt% and TiO2 recovery rate of 80.27 % is also obtained. The results show that sodium sulfate has a catalytic effect on the reduction of tailings in the novel process by thermody- namics, scanning electron microscopy （SEM） and X-ray diffraction （XRD） and reacts with silica and alumina in the tailings to form sodium silicate and sodium aluminosili- cate. Migration of elements and chemical reactions destroy the crystal structures of minerals and promote the reduction of vanadium tailings, resulting in that iron grains grow to large size so that metallic iron concentrate with high total iron grade and low TiO2 content is obtained.

关键词： Vanadium tailings Reduction roasting Sodium sulfate Fe-Ti separation

Bioleaching of chalcopyrite and bornite by moderately thermophilic bacteria: an emphasis on their interactions

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International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 777-787页

作者： Hong-bo Zhao Jun Wang Xiao-wen Gan Wen-qing Qin Ming-hao Hu guan-zhou qiu School of Minerals Processing & Bioengineering Central South University Key Lab of Bio-hydrometallurgy of the Ministry of Education

Interactions between chalcopyrite and bornite during bioleaching by moderately thermophilic bacteria were investigated mainly by X-ray diffraction, scanning electron microscopy, and electrochemical measurements performed in conjunction with bioleaching experiments. The results showed that a synergistic effect existed between chalcopyrite and bornite during bioleaching by both Acidithiobacillus caldus and Leptospirillum ferriphilum and that extremely high copper extraction could be achieved when chalcopyrite and bornite coexisted in a bioleaching system. Bornite dissolved preferentially because of its lower corrosion potential, and its dissolution was accelerated by the galvanic current during the initial stage of bioleaching. The galvanic current and optimum redox potential of 390-480 m V vs. Ag/Ag Cl promoted the reduction of chalcopyrite to chalcocite(Cu2S), thus accelerating its dissolution.

关键词： chalcopyrite bornite bioleaching interactions redo

Transformation and separation of metallic iron in reduced ilmenite during corrosion process

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Journal of Iron and Steel Research International 2020年第12期27卷 1372-1381页

作者： Fu-qiang Zheng Xia Liu Yu-feng Guo Shuai Wang Feng Chen Ling-zhi Yang Tao Jiang guan-zhou qiu School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina Hunan Qingzhiyuan Environmental Protection Technology Co. Ltd.Changsha 410083HunanChina

The effects of corrosion temperature, oxygen flow rate and corrosion time on the transformation of metallic iron were systematically studied, and the effects of mineral phases of Fe-bearing products on Ti-Fe separation were investigated. The reaction mechanism of metallic iron in corrosion process was proposed. The results showed that corrosion temperature played a key role in determining the transformation of metallic iron in reduced ilmenite during corrosion process. Under suitable corrosion conditions, Fe-bearing mineral in reduced ilmenite could be converted to amorphous ferric hydroxide, lepidocrocite,hematite and magnetite, respectively, and lepidocrocite was the most easily separated Fe-bearing mineral from corrosion products owing to the significant density difference between lepidocrocite and Ti-rich materials. The Ti-rich material with 77.81 wt.% TiO2 and Fe-bearing product with 52.69 wt.% total Fe were obtained by gravity separation. The Ti recovery ratio and Fe recovery ratio were 91.16% and 86.27%, respectively.

关键词： Reduced ilmenite Corrosion Ti-rich material Fe-bearing mineral Lepidocrocite Metallic iron

Biotech key to unlock mineral resources value

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Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2309-2317页

作者： guan-zhou qiu Xue-duan LIU School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Biometallurgy of Ministry of Education Central South UniversityChangsha 410083China

This work aims to describe the history of biometallurgy in China,introduce the development and application of biometallurgy technologies in exploitation of mineral resources,and identify the main challenges and future *** the earliest biometallurgy activities in China were documented in 6th−7th century BC,fundamental research and biometallurgy applications started relatively late in this *** development,from phenotypic to genotypic characterization of biometallurgy microorganisms,as well as from theoretical to practical applications,has been made in China since the *** integrated applications of biometallurgy technology in copper,gold,and uranium extraction ensured China’s economic reserves of strategic mineral *** more efficient microorganisms and strengthening the micro-interface reactions will be an effective way to improve the biometallurgy *** technologies can also be adapted to recovery of valuable metal from marine minerals and e-wastes and environmental protection including carbon sequestration and heavy metal polluted soil/sediment bioremediation.

关键词： biotechnology biometallurgy bioleaching mineral resources nonferrous metals

Effect of pH values on the extracellular polysaccharide secreted by Acidithiobacillus ferrooxidans during chalcopyrite bioleaching

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International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 311-316页

作者： Run-lan Yu Jing Liu Jian-xi Tan Wei-min Zeng Li-juan Shi Guo-hua Gu Wen-qing Qin guan-zhou qiu School of Minerals Processing and Bioengineering Central South University Key Laboratory of Biometallurgy Ministry of Education Hunan Entry-Exit Inspection and Quarantine Bureau

The pH value plays an important role in the bioleaching of sulphide minerals. The effect of pH values on the extracellular poly-saccharide secreted by Acidithiobacillus ferrooxidans was investigated in different phases of bacterial growth during chalcopyrite bioleach-ing. It is found that extracellular polysaccharide secretion from the cells attached to chalcopyrite is more efficiently than that of the free cells in the bioleaching solution. Three factors, pH values, the concentration of soluble metal ions, and the bacterial growth and metabolism, affect extracellular polysaccharide secretion in the free cells, and are related to the bacterial growth phase. Extracellular polysaccharide secretion from the attached cells is mainly dependent on the pH value of the bacterial culture.

关键词： chalcopyrite bioleaching polysaccharides acidity Acidithiobacillusferrooxidans

Relationship among the secretion of extracellular polymeric substances, heat resistance, and bioleaching ability of Metallosphaera sedula

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1504-1511页

作者： Run-lan Yu Zhen-hua Liu Zhao-jing Yu Xue-ling Wu Li Shen Yuan-dong Liu Jiao-kun Li Wen-qing Qin guan-zhou qiu Wei-min Zeng School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Biometallurgy of Ministry of Education Central South UniversityChangsha 410083China

This paper describes the investigation of the secretion of extracellular polymeric substances(EPS)by an extremely thermoacidophilic archaea,Metallosphaera sedula(***),during the bioleaching of pyrite under different temperatures and discusses the relationship among the EPS secretion,its heat resistance,and its ability to bioleach *** investigation results indicate that the amount of extracellular proteins is significantly higher than the amount of extracellular polysaccharides in the extracted EPS whether free cells or attached cells;these results are quite different from the behavior of mesophilic Acidithiobacillus *** the growth of *** is inhibited at 80℃,the bioleaching ability of *** is only slightly lower than that at the optimum growth temperature of 72℃ because of the heat resistance mechanism based on EPS *** secretion of more extracellular proteins is an important heat resistance mechanism of ***.

关键词： bioleaching extracellular polymeric substances(EPS) heat resistance Metallosphaera sedula

Enhanced recovery of zinc and lead by slag composition optimization in rotary kiln

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Transactions of Nonferrous Metals Society of China 2022年第9期32卷 3110-3122页

作者： Hong-fu LIN Wei WENG Shui-ping ZHONG guan-zhou qiu School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China State Key Laboratory of Comprehensive Utilization of Low Grade Refractory Gold Ores Zijin Mining Group Co.Ltd.Shanghang 364200China Zijin School of Geology and Mining Fuzhou UniversityFuzhou 350108China

High-efficiency recovery of Zn and Pb from silicon-rich zinc leaching residues is realized in a rotary *** by means of XRD,SEM,EDS and ICP reveal that the leaching residue contains 12.4 wt.%SiO_(2),16.1 wt.%Zn,and 7.4 wt.%*** analysis shows that metallic vapor of Zn and Pb can be easily generated from the zinc leaching residue at 1150-1250°C inside the rotary *** and melting points of 13 slag compositions were analyzed and three slag compositions(47wt.%SiO_(2)-23wt.%CaO-30wt.%FeO,40wt.%SiO_(2)-28wt.%CaO-32wt.%FeO,and 40wt.%SiO_(2)-30wt.%CaO-30wt.%FeO)possessed the desirable physical properties,with the melting point and viscosity in the range of 1150-1280°C and 0.2-0.5 Pa·s,*** industrial tests show that adopting the optimized slag composition can contribute to very high recovery rates of Zn and Pb(97.3%for Zn and 94.5%for Pb),corresponding to slags with very low average contents of Zn and Pb(0.51 wt.%Zn and 0.45 wt.%Pb).The National-Standard leaching tests of the water-quenched slags result in 1.82 mg/L Zn,~0.01 mg/L Cu,0.0004 mg/L As,~0.01 mg/L Cd,0.08 mg/L Pb,and~0.02 mg/L Hg in the leachate,verifying the detoxification of the zinc leaching residue at the same time.

关键词： zinc leaching residues metals recovery rotary kiln slag composition optimization detoxification