Abstract:In the current study, rotating disk electrode (RDE) measurements were performed to gain insight into the oxygen reduction reaction (ORR) performance of the natural massive pyrite electrode in acidic media. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were also performed. The tafel slopes and electron transferred numbers were calculated according to the test results. The ORR process took place in the potential range of ?0.450 V to 0.050 V vs. AgCl/Ag. The average transferred electron number for ORR on pyrite in sulfuric acid was near to 2. The addition of ferric ion was shown to increase the dissolution rate of pyrite and the transferred electron numbers for ORR. At high concentration of ferric ion, the ORR process was inhibited attributing to a Fenton-like reaction mechanism and more intermediate H2O2 was produced accordingly.

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	1. Rotating disc electrode measurements of oxygen reductionreaction on natural massive pyrite in acidic media
	CHEN Guobao,YANG Hongying
	Metallurgical Engineering 18 March 2016
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (613K B)

	Abstract:In the current study, rotating disk electrode (RDE) measurements were performed to gain insight into the oxygen reduction reaction (ORR) performance of the natural massive pyrite electrode in acidic media. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were also performed. The tafel slopes and electron transferred numbers were calculated according to the test results. The ORR process took place in the potential range of ?0.450 V to 0.050 V vs. AgCl/Ag. The average transferred electron number for ORR on pyrite in sulfuric acid was near to 2. The addition of ferric ion was shown to increase the dissolution rate of pyrite and the transferred electron numbers for ORR. At high concentration of ferric ion, the ORR process was inhibited attributing to a Fenton-like reaction mechanism and more intermediate H2O2 was produced accordingly.
	TO cite this article:CHEN Guobao,YANG Hongying. Rotating disc electrode measurements of oxygen reductionreaction on natural massive pyrite in acidic media[OL].[18 March 2016] http://www.paper.edu.cn/en_releasepaper/content/4681002


	2. Investigation of surface species during bioleaching of chalcopyrite by moderately thermophilic bacteria
	WANG Jun,ZHAO Hongbo,TAO Lang,CAO Pan,QIN Wenqing,QIU Guanzhou
	Metallurgical Engineering 08 January 2015
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (399K B)

	Abstract: Electrochemical measurement, X-ray diffraction analysis (XRD) and X-ray photoelectron experiment (XPS) analysis were carried out to investigate the surface species and interfacial reactions during bioleaching of chalcopyrite by different strains of moderately thermophilic bacteria. Results showed that CuS and disulfide (S22-) were the main intermediate species on the surface of chalcopyrite during bioleaching by A. caldus, S. thermosulfidooxidans and L. ferriphilum. The low kinetics of dissolution of chalcopyrite in A. caldus can be mainly due to the incomplete dissolution of chalcopyrite and the passivation layer of polysulfide. Polysulfide and jarosite can be mainly responsible for the passivation of chalcopyrite in bioleaching by L. ferriphilum or by S. thermosulfidooxidans.
	TO cite this article:WANG Jun,ZHAO Hongbo,TAO Lang, et al. Investigation of surface species during bioleaching of chalcopyrite by moderately thermophilic bacteria[OL].[ 8 January 2015] http://www.paper.edu.cn/en_releasepaper/content/4625972

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	3. Bioleaching of chalcopyrite and marmatite by moderately thermophilic bacteria: An investigation of their interactions Stepwise bioleaching process
	WANG Jun,ZHAO Hongbo,TAO Lang,CAO Pan,QIN Wenqing,QIU Guanzhou
	Metallurgical Engineering 07 January 2015
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	Abstract: Chalcopyrite and marmatite are associated together most of the time in the raw ores and flotation concentrates. In this work, the interactions between chalcopyrite and marmatite during bioleaching by moderately thermophilic bacteria were investigated mainly by electrochemical measurements and bioleaching experiments. In the initial stage of bioleaching of mixture of chalcopyrite and marmatite, the dissolution of marmatite was preferential, and was significantly accelerated with the addition of chalcopyrite because of the galvanic effect and catalytic effect of Cu2+ ions, while the dissolution of chalcopyrite was inhibited mainly due to the galvanic effect before the accomplishment of dissolution of marmatite. Chalcopyrite dissolved fast when the dissolution of marmatite finished, and small amount of marmatite cannot inhibit the final copper extraction of chalcopyrite if leaching time was long enough. Therefore, stepwise or selective bioleaching was feasible in processing mixture of chalcopyrite and marmatite to avoid complex flotation process in separating chalcopyrite and marmatite. )
	TO cite this article:WANG Jun,ZHAO Hongbo,TAO Lang, et al. Bioleaching of chalcopyrite and marmatite by moderately thermophilic bacteria: An investigation of their interactions Stepwise bioleaching process[OL].[ 7 January 2015] http://www.paper.edu.cn/en_releasepaper/content/4625975


	4. Solvent extraction of vanadium from a H2SO4-HF mixed acids leaching solution of stone coal
	LI Xingbin,WEI Chang,LI Cunxiong,DENG Zhigan,LI Minting,FAN Gang
	Metallurgical Engineering 02 November 2014
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (325K B)

	Abstract:Di (2-ethylhexyl) phosphoric acid (P204) and tri-n-butyl phosphate (TBP) were used to extraction vanadium from a H2SO4-HF mixed acids leaching solution of stone coal in this paper. Effect of different operational factors such as equilibrium pH, extractant concentration, extraction stage, strip solution concentration, phase ratio were examined to optimize the condition for selective and quantitative extraction and stripping of vanadium. Based on the results of extraction as well as stripping isotherm, the extraction of vanadium was quantitative in six stages using 10% P204 and 5% TBP at A:O ratio of 1:1 and equilibrium pH of 2.4; 99.6% percentage stripping of vanadium from the loaded organic phase was obtained by five stage stripping using 1.5 mol/L H2SO4 at A:O ratio of 1:8. In the solvent extraction process, scrubbing is necessary for removing co-extracted and entrainment impurities by dilute sulfuric acid solution, more than 90% iron and arsenic can be scrubbed by 0.2 mol/L sulfuric acid.
	TO cite this article:LI Xingbin,WEI Chang,LI Cunxiong, et al. Solvent extraction of vanadium from a H2SO4-HF mixed acids leaching solution of stone coal[OL].[ 2 November 2014] http://www.paper.edu.cn/en_releasepaper/content/4616474


	5. Solvent extraction of vanadium (IV) from sulfuric acid solution using P507
	LI Xingbin,WEI Chang,DENG Zhigan,LI Minting,LI Cunxiong,FAN Gang
	Metallurgical Engineering 29 October 2014
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (343K B)

	Abstract:Solvent extractionof vanadium(IV) from sulfuric acid solution has been studied using 2-ethyhexyl phosphonic acid mono 2-ethylhexyl ester (P507) dissolved in kerosene. The different affecting parameters of equilibrium pH, extractant concentration, temperature and extraction isotherm were separately investigated. The extraction of vanadium(IV) from a synthetic sulfuric acid leach solution of stone coal was also examined. The equilibrium study indicated the release of two moles of H+ ions for extraction of one mole of vanadium(IV) and association of two moles of the mono extractant in the extracted species. The extracted complex VOA2 was calculated from slope analysis and confirmed by IR spectra. A positive value of ΔH obtained from temperature variation studies show that the extraction process is endothermic reaction. A continuous counter current simulation extractionand stripping confirmed 96.1% extraction and 99.6% stripping, further attributes to the enrichment 5 times of vanadium(IV) concentration in the strip solution.
	TO cite this article:LI Xingbin,WEI Chang,DENG Zhigan, et al. Solvent extraction of vanadium (IV) from sulfuric acid solution using P507[OL].[29 October 2014] http://www.paper.edu.cn/en_releasepaper/content/4615430


	6. Study on volatility of manganese metal in reduction process of manganese ore self-reduction pellets at high temperature
	XUE Zheng-liang,ZHANG Bo,YU Yue,DONG Jiang
	Metallurgical Engineering 25 January 2014
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (416K B)

	Abstract:In order to study the thermodynamic and kinetics of Mn volatilization in the reduction process, the self-reduction experiment of carbon-mixed manganese ore pellets was performed in carbon tube furnace at high temperature. The results show that the Mn equilibrium vapor pressure becomes higher and the Mn volatile quantity is increasing with the temperature increasing. A model, controlled by both the interface chemistry reaction and diffusion in solid products layer is established. The apparent activation energy of chemical reaction is 192.8kJ/moland the apparent activation energy of internal diffusion is 21.94kJ/mol, so the volatility of Mn is controlled by the chemical reaction rate.
	TO cite this article:XUE Zheng-liang,ZHANG Bo,YU Yue, et al. Study on volatility of manganese metal in reduction process of manganese ore self-reduction pellets at high temperature[OL].[25 January 2014] http://www.paper.edu.cn/en_releasepaper/content/4583707


	7. Effect of microwave irradiation on selective heating behavior and magnetic separation characteristics of Panzhihua ilmenite
	Zhao Wei,Chen Guo,Chen Jin,Peng Jinhui
	Metallurgical Engineering 27 December 2013
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	Abstract:The influences of microwave irradiation on the surface characteristics of Panzhihua ilmenite were systematically investigated. The crystal structures, surface morphology and surface chemical functional groups of ilmenite were characterized before and after microwave irradiation and magnetic separation for different microwave treatment times by using various methods, such as XRD, SEM, and FT-IR, respectively. XRD analysis showed that the microwave treated ilmenite has the strongest peaks of phase more than that of raw samples, indicates that the crystalline compound of ilmenite increased with the microwave irradiation time. SEM analysis showed the micro-cracking appeared at many grain boundaries of ilmenite after being pretreated by microwave treatment. The separations of ilmenite from gangue minerals were completed and the micro-fissure within ilmenite minerals were also formed, which could be attributed to the microwave selective heating characteristics of the different minerals and compounds, and the thermal stresses were caused by the uniform heat rate disturbed under microwave irradiation. The mineral processing results showed that the magnetic separation characteristics and properties of microwave treated ilmenite samples were better than that of microwave untreated ilmenite samples. It was concluded that microwave irradiation can be applied effectively and efficiently to the irradiation processes of Panzhihua ilmenite.
	TO cite this article:Zhao Wei,Chen Guo,Chen Jin, et al. Effect of microwave irradiation on selective heating behavior and magnetic separation characteristics of Panzhihua ilmenite[OL].[27 December 2013] http://www.paper.edu.cn/en_releasepaper/content/4579026


	8. Numerical Simulation of Multiphase Flow in Vanyukov Furnace
	ZHANG Hongliang,CHEN Yongming
	Metallurgical Engineering 28 October 2013
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	Abstract:The multiphase flow of widely used Vanyukov furnace was numerically studied. An unsteady three-dimensional and three-phase flow model was firstly built by Computational Fluid Dynamics (CFD) software ANSYS FLUENT?, and then solved with Volume of Fluid (VOF) and - model. The results showed that the proposed model could be used to predict the multi-phase movement, the slag/air fluctuation, the vortex formation and effects of structural and operational parameters. By Fast Fourier Transform(FFT), the dominant frequency of density with time signal was calculated, which was 0.29 Hz. The analysis of different injection flow rates of enriched air indicated that it has huge effect on the mean slag velocity. The peak mean velocity changed from 2.17 to 4.99 m/s while the flow rate of enriched air varied from 70 to 160 m/s. The proposed model provided a method to optimize the furnace structure and operating conditions for the best furnace performance and lowest energy consumption.
	TO cite this article:ZHANG Hongliang,CHEN Yongming. Numerical Simulation of Multiphase Flow in Vanyukov Furnace[OL].[28 October 2013] http://www.paper.edu.cn/en_releasepaper/content/4566463


	9. Study on relationships between cooling conditions and structure changes of molten slag
	Li Yu,Liu Xiaoming,Cang Daqing
	Metallurgical Engineering 15 July 2013
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (372K B)

	Abstract: Properties of slag have an important effect on its cooling process and subsequent utilization of slag and are affected by the changes of structure in slag. In the paper, blast furnace slag（BFS）re-melted respectively at 1350℃, 1450℃ and 1550℃ were water-quenched to prepare samples, along with an air-quenched sample re-melted at 1450℃ as reference. The samples were investigated by using XRD, DTA and NMR. The results show that two transformation types of aluminosilicates structure exist in the melts under different cooling condition. A high temperature transformation (HTT) would occur when melts cooled under very slow or very fast cooling speed and would respectively leaded the melts to precipitate melilite crystals or freeze into homogeneous glass phase. The other is a low temperature transformation (LTT), which would happen when a sub-stable phase-separated structure came into being in the melts cooled under a relative slow or fast cooling speed. And it would respectively lead the melts precipitate mervinite crystals or freeze into phase-separated glass phase. The sub-stable phase-separated structure is a coexistence structure of high polymeric Q4(2Al) or melilite units (Si-rich phase) with low polymeric Q0 units (Ca-rich phase). Mg2+ would change its coordination from 4 to 6 during LTT, which increases the amounts of Q0 units and is contributed to the formation of the phase-separated structure.
	TO cite this article:Li Yu,Liu Xiaoming,Cang Daqing. Study on relationships between cooling conditions and structure changes of molten slag[OL].[15 July 2013] http://www.paper.edu.cn/en_releasepaper/content/4551309


	10. Research on the reducing product of carbonthermal reduction of ilmenite ores
	Song Zengkai,Chen Guo,Chen Jin,Peng Jinhui
	Metallurgical Engineering 17 April 2013
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (486K B)

	Abstract:In this present study, the reducing products of carbonthermal reduction of ilmenite ores were evaluated. The crystal structures, microstructure and surface chemical functional groups of the ilmenite ores and the reducing product of carbonthermal reduction were also analyzed using XRD, SEM, Raman and FT-IR, respectively. Sulphate titanium slag and high titanium slag were the major reducing products of carbonthermal reduction of ilmenite ores. It was found that the low-valent titanium of high titanium slag was increased after carbonthermal reduction of ilmenite ores with higher temperature and longer processing time. Based on the results, this method could be applied effectively and efficiently way for both utilization of ilmenite ores and preparation of sulphate titanium slag and high titanium slag.
	TO cite this article:Song Zengkai,Chen Guo,Chen Jin, et al. Research on the reducing product of carbonthermal reduction of ilmenite ores[J].

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