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DISSOLUTION KINETICS OF GOLD AND SILVER IN CYANIDATION

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Transactions of Nonferrous Metals Society of China 1992年第3期2卷 53-58页

作者： fang zhaoheng Mamoun Muhammed Institute of Chemical Metallurgy Academia SinicaBeijing 100080China Royal Institute of Technology Sweden

The dissolution kinetics of gold and silver cyanidation of Cu-Au sulfide concentrate has been investigated at ambient temperature in consideration of effects of various parameters,such as particle size of ores,*** of the process and initial cyanide concentration as well as oxygen partial *** experimental data are mathematically treated with an approach based on the shrinking core model.A phenomenological expression describing the rate and rate constants for cyanidation of the concentrate is developed from the *** dissolution of gold and silver is explained by an electrochemical mechanism in which the rate determining step is,the diffusion of cyanide and dissolved molecular oxygen through a porous layer formed during the minerals dis-solutions.

关键词： dissolution kinetics Cu-Au sulfide concentrate cyanidation electrochemical mechanism

LEACH OUT GOLD AND SILVER FROM SULFIDE CONCENTRATE CONTAINING COPPER WITH CYANIDE AND AMMONIA SOLUTIONS

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Transactions of Nonferrous Metals Society of China 1992年第1期2卷 43-52,57页

作者： fang zhaoheng Muhammed M Institute of Chemical metallurgy Academia SnicaBeijing 100080 Royal Institute of Technology Sweden

A cyanidation leaching process for a sulfide concentrate containing gold and silver with ammonia and other complexes was investigated,and its potential in decrease of cyanide consumption was *** equilibria behaviors of copper and other metal ions in the CN-NH,-H_(2)0 system and the CN—NH,—EDTA-HjO system were analyzed by a microcomputer *** revealed that the leaching yield of gold in ammonia-cyanide solutions was raised from 86%to 99%from addition of EDTA in a certain concentration and its cooperative action with ammonia on the cyanidation of ***,the leaching yield of silver was significantly increased from about 20%to 55%and the consumption of cyanide was decreased.

关键词： gold silver sulfide cyanidation leaching

ELECTRODEPOSITION OF NICKEL FROM ALL CHLORIDE ELECTROLYTE

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Transactions of Nonferrous Metals Society of China 1992年第3期2卷 46-52页

作者： Gong Qian Liao Hong Yang Tao Hu Jiexue fang zhaoheng Institute of Chemical Metallurgy Academia SinicaBeijing 100080China

The optimum operating conditions for the electrodeposition of nickel from all-nickel chloride electrolytes were studied,based on measurements of conductivity,surface tension,viscosity of nickel chloride electrolytes at different temperatures and concentrations of nickel chloride as well as the experiments of electrodeposition arranged using experimental design in the normal *** studying cathode polarization and examination of physical features of cathodic nickel,the effects of trace Fe,Co,Pb..TBP and N-235 in all-nickel chloride electrolyte on cathode potentials,cell voltages,current efficiency and energy consumption as well as the morphology and the internal stress of cathodic nickel in electrodeposition of nickel were examined.

关键词： electrodeposition nickel chloride

ELECTROCHEMICAL STUDIES ON THE MECHANISM OF GOLD DISSOLUTION IN THIOSULFATE SOLUTIONS

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中国有色金属学会会刊：英文版 1994年第1期4卷 50-53,58页

作者： Zhu, Guocai fang, zhaoheng Chen,Jiayong(InStdute of Chrmicof Meuulargy,Lvhinere Acadeiny of Sciences,Beijing100080, China)

ＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＳＴＵＤＩＥＳＯＮＴＨＥＭＥＣＨＡＮＩＳＭＯＦＧＯＬＤＤＩＳＳＯＬＵＴＩＯＮＩＮＴＨＩＯＳＵＬＦＡＴＥＳＯＬＵＴＩＯＮＳＺｈｕ，Ｇｕｏｃａｉ；Ｆａｎｇ，Ｚｈａｏｈｅｎｇ；Ｃｈｅｎ，Ｊｉａ... 详细信息

ＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＳＴＵＤＩＥＳＯＮＴＨＥＭＥＣＨＡＮＩＳＭＯＦＧＯＬＤＤＩＳＳＯＬＵＴＩＯＮＩＮＴＨＩＯＳＵＬＦＡＴＥＳＯＬＵＴＩＯＮＳＺｈｕ，Ｇｕｏｃａｉ；Ｆａｎｇ，Ｚｈａｏｈｅｎｇ；Ｃｈｅｎ，Ｊｉａｙｏｎｇ（ＩｎＳｔｄｕｔｅｏｆＣｈ...

关键词： gold disaolution thiosulfafe solution mechanism electrochemistry

ELECTROCHEMICAL STUDIES ON ANODIC DISSOLUTION OF SYNTHETIC NICKEL SULFIDES

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Acta Metallurgica Sinica(English Letters) 1989年第9期2卷 159-166页

作者： fang zhaoheng CHEN Jiayong Institute of Chemical Metallurgy,Academia Sinica,Beijing,China CHEN Jiayong Institute of Chemical Metallurgy,Academia Sinica,Zhongguancun,Beijing,China

The anodic behavior of synthetic nickel sulfides in sulfuric acid solutions was *** the anodes of Ni_3S_2 ,Ni_7S_6 and NiS are actively dissolved respectively,a solid layer forms on the electrode surface with its nature and composition depending on the potentials applied. Based on the electrochemical phenomena,phase and elemental compositions of the solid layer formed on the electrode surface were *** apparent number of electrons transfer- red during dissolution of Ni^(2+)was also *** can be considered that there are three parallel reactions ocurred on the electrode:the reaction with formation of HSO_4^- or SO_4^(2-), the reaction with formation of sulfides as intermediates and the reaction of Jorming elemental *** NiS_2 as an anode,formation of SO_4^(2-)or HSO_4^- can be considered as the only re- action occurred on the electrode.

关键词： nickel sulfide anodic dissolution electrochemical behavior

LEACHING OF PRECIOUS METALS FROM COMPLEX SULPHIDE ORES——*** LEACHING OF Cu SULFIDE CONCENTRATE BY ACIDIC THIOUREA SOLUTIONS

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中国有色金属学会会刊：英文版 1993年第4期3卷 24-29页

作者： fang,zhaoheng Institute of Chemical Metallurgy,Academia Sinica,Beijing 100080Muhammed,Mamoun Royal Institute of Technology,S—100044 Stockholm,Sweden

Recovery of gold and silver from a sulphide concentrate by thiourea leaching was *** effects of various parameters on the process,such as oxidants,the initial concentrationof thiourea and acidity in solutions as well as reaction temperature,were systematically *** the results it was confirmed that(a)oxidants had no significant influence on the dis-solution of gold and silver at a fixed initial concentration of thiourea;(b)the initial concentra-tion of thiourea and acidity affected the dissolution rate only in the earliest period of leaching;(c)the rate of the process was controlled by reagent *** optimum operations wereworked out for the thiourea leaching process of the concentrate.

关键词： sulphide concentrate thiourea leaching recovery of gold silver

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镍硫化物阳极溶解的电化学研究

金属学报 1988年第6期24卷 463-470页

作者：方兆珩陈家镛北京中关村中国科学院化工冶金研究所

研究了合成镍硫化物的阳极过程。Ni3S2,Ni7S6和NiS的活性溶解伴随着生成表面产物层,其反应机理与电极电位有关。根据三种不同类型产物层生成规律的电化学研究,Ni溶出表观电子数的测定,以及产物层相组成分析和相的元素分析,认为存在三组... 详细信息

研究了合成镍硫化物的阳极过程。Ni3S2,Ni7S6和NiS的活性溶解伴随着生成表面产物层,其反应机理与电极电位有关。根据三种不同类型产物层生成规律的电化学研究,Ni溶出表观电子数的测定,以及产物层相组成分析和相的元素分析,认为存在三组平行反应:直接生成HSO4-或SO4-2的反应,生成中间硫化物的反应及生成元素硫的反应,每组反应具有不同的优势发展电位区。NiS2阳极溶解时,基本上为生成HSO4-或SO4-2的反应。

关键词：镍硫化物阳极溶解电化学

Preparation and applications of calcium ferrite as a functional material:A review

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 292-310页

作者： Xiuli Han Bowen Duan Lei Liu Shilong fang Weiwei Wang College of Mining Engineering North China University of Science and TechnologyTangshan 063210China Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources of Hebei Province Tangshan 063210China Key Laboratory of Mining Development and Security Technology of Hebei Province Tangshan 063210China

Calcium ferrite(CF)is recognized as a potential green and efficient functional material because of its advantages of magnetism,electrochemistry,catalysis,and biocompatibility in the fields of materials chemistry,environmental engineering,and ***-fore,the obtained research results need to be systematically summarized,and new perspectives on CF and its composite materials need to be *** on the presented studies of CF and its composite materials,the types and structures of the crystal are *** addition,the current application technologies and theoretical mechanisms with various properties in different fields are ***,the various preparation methods of CF and its composite materials are elaborated in *** importantly,the advantages and disadvantages of the synthesis methods of CF and its composite materials are discussed,and the existing problems and emerging challenges in practical production are ***,the key future research directions of CF and its composite materials have been prospected from the potential application technologies to provide references for its synthesis and efficient utilization.

关键词： calcium ferrite mineral functional materials preparation application perspectives

Efficient and simple synthesis of B_(2)O_(3)-Al_(2)O_(3)nanocomposites assisted by deep eutectic solvent for production of 5-hydroxymethylfurfural from glucose

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Nano Research 2025年第1期18卷 236-248页

作者： Yuchen Wang Kai Rong Shanlei Chang Youxing fang Shaojun Dong State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China College of Chemistry Jilin UniversityChangchun 130012China

The catalytic conversion of glucose to high valueadded platform chemical 5-hydroxymethylfurfural(HMF)is a promising biorefinery process,and alumina-boria catalysts are considered to be green and mild solid acid catalysts for this catalytic ***,compared to the common synthesis methods with complicated steps,we reported a simple and efficient strategy to prepare B_(2)O_(3)-Al_(2)O_(3)nanocomposites by calcining cost-effective glucose-urea deep eutectic solvent(DES)solution containing the *** prepared B_(2)O_(3)-Al_(2)O_(3)nanocomposites exhibited an open three-dimensional skeleton and two-dimensional porous lamellar substructure,endowing them with a high specific surface area(228.27 m2/g).The introduction of boron changed the ratios of different aluminum species(AlⅣ,AlⅤ,and AlⅥ)and borate species(BO3 and BO4),thus further affecting the acidity and the types of acid sites of the *** prepared B_(2)O_(3)-Al_(2)O_(3)bifunctional acid catalysts possessing abundant Lewis acid sites and adjustable Brønsted acid sites showed complete glucose conversion and 55.38%of HMF yield under the optimum *** study proposed a concise method to synthesize alumina-boria solid acid catalysts assisted by glucose-urea *** hope to extend the application and prospect of this efficient and simple synthesis strategy.

关键词： 5-hydroxymethylfurfural(HMF) deep eutectic solvent glucose alumina-boria acid catalyst