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Characteristics of phosphorus transformation from vivianite mediated by sulphide 认领 引用
1
作者 Zijun Song Jing Yang +5 位作者 Yumei Hua Guanglong Liu Guanghui Yu Jianwei Zhao Jinlong Hu Xiaoqiong Wan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第8期52-62,共11页
The release of phosphorus(P)from anaerobic sediments becomes the dominant source of P loading with effective control of external P pollution.As a crucial component responsible for binding P,vivianite(Fe3(PO4)_(2... The release of phosphorus(P)from anaerobic sediments becomes the dominant source of P loading with effective control of external P pollution.As a crucial component responsible for binding P,vivianite(Fe3(PO4)2·8H2O)in sediment inevitably impacts the P level and transformation.The release of P from vivianite mediated by sulphide was investigated using simulated overlying watersediment and chemical reaction systems.The percentage of redox-stable P in the sediments increased with vivianite input in the overlying watersediment system.Increasing P concentrations in both the overlying water and interstitial water occurred before day 10,accompanied by a decreasing percentage of redox-sensitive P in the sediments driven by sulphide.The continuous release of P from vivianite clarifies the influence of sulphide on promoting vivianite dissolution in a chemical reaction system with vivianite and sulphide solution.Additionally,Mössbauer spectrum and nanoscale secondary ionmass spectrometry(NanoSIMS)images based on the chemical reaction with57Fe isotope labelling demonstrated the presence of initial vivianite,newly produced vivianite,and FeS2. 展开更多
关键词 Sediment Vivianite Sulphide Phosphorus Mössbauer spectroscopy Nanoscale secondary ion mass spectrometry(NanoSIMS)
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Correlation between the Sulphide Capacity Index and the Slag Basicity 认领 引用
2
作者 Yang Xuemin Liu Tianzhong +2 位作者 Guo Zhancheng Yu Xianpu Wang Daguang 《Journal of Iron and Steel Research International》 SCIE CAS 1996年第1期5-10,共6页
The relationships between the sulphide capacity index and the optical basicity, the mole fraction of oxygen ion and the Bell's ratio were investigated based on extensive lab scale equilibrium and industry scale qu... The relationships between the sulphide capacity index and the optical basicity, the mole fraction of oxygen ion and the Bell's ratio were investigated based on extensive lab scale equilibrium and industry scale quasi-equilibrium experimental data in the temperature range of 1300 1600℃. Although the sulphide capacity index has good relations with different representations of slag basicity. according to the data obtained under the lab scale equilibrium experimental conditions,the similar relations do not exist according to the data obtained under the industry scale quasi-equilibrium experimental conditions. So it is concluded that the sulphide capacity index, which has been considered as a measure of the slag basicity. can not be used for virtually all oxide slags of interest in the field of ironmaking and steelmaking. 展开更多
关键词 sulphide capacity index sulphide capacity optical basicity metallurgical slag
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Copper,zinc,and iron bioleaching from polymetallic sulphide concentrate 认领 引用 被引量：13
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作者 Vesna T.CONIC Mirjana M.RAJCIC VUJASINOVIC +1 位作者 Vlastimir K.TRUJIC Vladimir B.CVETKOVSKI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3688-3695,共8页
Bioleaching of low-grade complex Cu&ndash;Zn&ndash;Pb&ndash;Fe&ndash;Ag&ndash;Au sulphide concentrate (of Majdanpek ore body, RTB Bor, Serbia) was carried out in an aerated bioleach reactor in the ... Bioleaching of low-grade complex Cu&ndash;Zn&ndash;Pb&ndash;Fe&ndash;Ag&ndash;Au sulphide concentrate (of Majdanpek ore body, RTB Bor, Serbia) was carried out in an aerated bioleach reactor in the presence of mesophilic mixed bacterial culture of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirillum ferrooxidans. A mesophilic acidophiles culture was isolated from the acidic solution of the underground copper mine of Bor, Serbia. The nutrient medium was 9K at pH 1.6. 87% of the particles were <10 &micro;m in size, with a pulp density of 8% (w/v). Bioleaching efficiencies of 89% for zinc, 83% for copper, and 68% for iron can be achieved in the examined conditions. Kinetic analysis shows that the change in leaching corresponds to the Spencer-Topley kinetic model for diffusion-controlled topochemical reactions. 展开更多
关键词 bioleaching polymetallic sulphide concentrate mesophiles Acidithiobacillus ferrooxidans
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Comparative study on the passivation layers of copper sulphide minerals during bioleaching 认领 引用 被引量：7
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作者 Kai-bin Fu Hai Lin +3 位作者 Xiao-lan Mo Han Wang Hong-wei Wen Zi-long Wen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第10期886-892,共7页
The bioleaching of copper sulphide minerals was investigated by using A. ferrooxidans ATF6. The result shows the preferential order of the minerals bioleaching as djurleite〉bomite〉pyritic chalcopyrite〉covellite〉po... The bioleaching of copper sulphide minerals was investigated by using A. ferrooxidans ATF6. The result shows the preferential order of the minerals bioleaching as djurleite〉bomite〉pyritic chalcopyrite〉covellite〉porphyry chalcopyfite. The residues were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It is indicated that jarosite may not be responsible for hindered disso- lution. The elemental sulfur layer on the surface of pyritic chalcopyrite residues is cracked. The compact surface layer of porphyry chalcopy- rite may strongly hinder copper extraction. X-ray photoelectron spectroscopy （XPS） further confirms that the passivation layers of covellite, pyritic chalcopyrite, and porphyry chalcopyrite are copper-depleted sulphide Cu4S11, S8, and copper-rich iron-deficient polysulphide CtuFe2S9, resoectivelv. The ability of these oassivation layers was found as Cu4Fe2S9〉Cu4S11〉S8〉iarosite. 展开更多
关键词 copper ore treatment copper sulphide bioleaching passivation
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Atmospheric oxygen-rich direct leaching behavior of zinc sulphide concentrate 认领 引用 被引量：13
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作者 徐志峰 江庆政 王成彦 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第12期3780-3787,共8页
The leaching behavior of main metallic sulphides in zinc concentrate under atmospheric oxygen-rich direct leaching conditions was studied through mineralogical analysis. The results show that the sulphides dissolve ob... The leaching behavior of main metallic sulphides in zinc concentrate under atmospheric oxygen-rich direct leaching conditions was studied through mineralogical analysis. The results show that the sulphides dissolve obviously except pyrite. Based on the relationship between elemental sulfur and the residual sulphides in the leaching residue, the dissolution of sphalerite, chalcopyrite, covellite and galena is assumed to follow the indirect oxidation reactions, where the acidic dissolution takes place firstly and then the released H2S transfers from the mineral surface into bulk solution and is further oxidized into elemental sulfur. The interface chemical reaction is further supposed as the controlling step in the leaching of these sulphides. The direct electrochemical oxidation reactions are assumed to contribute to the dissolution of pyrrhotite, which is controlled by the diffusion through elemental sulfur layer. 展开更多
关键词 zinc sulphide concentrate atmospheric direct leaching oxygen-rich leaching leaching behavior mineralogy
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Corrosion and Cavitation Erosion Behaviours of Cast Nickel Aluminium Bronze in 3.5% NaCl Solution with Different Sulphide Concentrations 认领 引用 被引量：5
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作者 Qi-Ning Song Nan Xu +8 位作者 Yao Tong Chen-Ming Huang Shou-Yu Sun Chen-Bo Xu Ye-Feng Bao Yong-Feng Jiang Yan-Xin Qiao Zhi-Yuan Zhu Zheng-Bin Wang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2019年第12期1470-1482,共13页
The effect of sulphide(Na2S)concentration(SC)on the corrosion and cavitation erosion behaviours of a cast nickel aluminium bronze(NAB)in 3.5% NaCl solution is investigated in this study.The results show that when the ... The effect of sulphide(Na2S)concentration(SC)on the corrosion and cavitation erosion behaviours of a cast nickel aluminium bronze(NAB)in 3.5% NaCl solution is investigated in this study.The results show that when the SC exceeds 50 ppm,the hydrogen evolution reaction dominates the cathodic process,and a limiting current region appears in the anodic branch of the polarisation curve due to the formation of a copper sulphide film,which is a diffusion-controlled process.After longterm immersion,the increased mass loss rate of NAB with the sulphide additions of 20 and 50 ppm is attributed to the less protective films,which contains a mixture of copper oxides and sulphides.Moreover,NAB undergoes severe localised corrosion(selective phase corrosion,SPC)at the β’phases and eutectoid microstructureα+κⅢ.By comparison,NAB undergoes general corrosion and a copper sulphide film is formed in 100 and 200 ppm sulphide solutions.Cavitation erosion greatly increases the corrosion rate of NAB in all solutions and causes a negative potential shift in 3.5%NaCl solution due to the film destruction.However,a positive potential shift occurs in the solutions with SC higher than 50 ppm due to the accelerated mass transfer of the cathodic process.The cavitation erosion mass loss rate of NAB increases with the increase of SC.The occurrence of severe SPC decreases the phase boundary cohesion and causes brittle fracture under the cavitation impact.The corrosion-enhanced erosion is the most predominant factor for the cavitation erosion damage when the SC exceeds 50 ppm. 展开更多
关键词 Nickel aluminium bronze Sulphide Corrosion Cavitation erosion Synergy
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Interaction effects of flotation reagents for SAG mill reject of copper sulphide ore using response surface methodology 认领 引用 被引量：7
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作者 Ali AHMADI Mojtaba REZAEI Seyed Mohammad SADEGHIEH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第3期792-806,共15页
Flotation reagents have a complex behaviour in the beneficiation of base minerals in clayey ores.Interaction effects of reagents on the efficiency of copper flotation for a highly clayey low-grade sulphide ore were in... Flotation reagents have a complex behaviour in the beneficiation of base minerals in clayey ores.Interaction effects of reagents on the efficiency of copper flotation for a highly clayey low-grade sulphide ore were investigated using a central composite design.Preliminary results showed that sodium-isopropyl-xanthate(SIPX)and O-isopropyl-N-ethyl-thionocarbamate(IPETC)were found to be the most efficient collectors in the presence of lime as the pH regulator.The effects of dosage of collectors(SIPX and IPETC)and the dosage of methyl-isobutyl-carbonyl(MIBC)as frother on the separation efficiency were evaluated at different pH levels.Based on the analysis of variance(ANOVA),the interaction effects of the collector−pH and collector−frother were significant for the separation efficiency.At the low level of collector dosage,increasing pH from 9 to 11 enhanced copper separation efficiency from 81%to 86%for IPETC and from 77%to 86%for SIPX.Results of ANOVA showed that the maximum copper separation efficiency(88.7%)was obtained at the dosages of 8.6 g SIPX,7 g IPETC and 20 g MIBC at pH 11.Finally,it was concluded that a mixture of SIPX and IPETC collectors was more suitable to treat highly clayey sulphide ores. 展开更多
关键词 flotation copper sulphide reagent interaction effect reject ore
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Effects of forced aeration on community dynamics of free and attached bacteria in copper sulphide ore bioleaching 认领 引用 被引量：6
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作者 Wei Chen Shenghua Yin I.M.S.K.Ilankoon 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第1期59-69,共11页
Bacterial community dynamics and copper leaching with applied forced aeration were investigated during low-grade copper sulphide bioleaching to obtain better bioleaching efficiency.Results illustrated that appropriate... Bacterial community dynamics and copper leaching with applied forced aeration were investigated during low-grade copper sulphide bioleaching to obtain better bioleaching efficiency.Results illustrated that appropriate aeration improved bacterial concentrations and leaching efficiencies.The highest bacterial concentration and Cu2+concentration after 14-d leaching were 7.61×107 cells·mL−1 and 704.9 mg·L−1,respectively,at aeration duration of 4 h·d−1.The attached bacteria played a significant role during bioleaching from 1 to 7 d.However,free bacteria dominated the bioleaching processes from 8 to 14 d.This phenomenon was mainly caused by the formation of passivation layer through Fe3+hydrolysis along with bioleaching,which inhibited the contact between the attached bacteria and ore.Meanwhile,16S rDNA analysis verified the effect of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans on the bioleaching process.The results demonstrate the importance of free and attached bacteria in bioleaching. 展开更多
关键词 attached bacteria bioleaching forced aeration free bacteria low-grade copper sulphide ore
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Organic Composition of Sulphide Ores in the Okinawa Trough and Its Implications 认领 引用 被引量：8
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作者 张绮玲 侯增谦 唐邵华 《Acta Geologica Sinica(English Edition)》 SCIE CAS 2001年第2期196-203,共8页
A preliminary organic geochemical study shows that the sulphide ores from the hydrothermal deposit of the Okinawa Trough are generally low in the total organic carbon and extremely low in the soluble organic matter. I... A preliminary organic geochemical study shows that the sulphide ores from the hydrothermal deposit of the Okinawa Trough are generally low in the total organic carbon and extremely low in the soluble organic matter. In the aliphatic hydrocarbon fraction, the n-alkanes range from C15 to C35, with usual maxima in the middle n-C20 region and strong odd-carbon number predominance when n > C25 (CPI = 1.2). The dominant analog in the aromatic fraction is phenanthrene, a polynuclear aromatic hydrocarbon, which provides evidence for hydrothermal activity. The organic matter derived mainly from marine planktonic and terrigenous vascular plants is entrapped in a high-temperature regime such as an active chimney and cooled quickly in the sulphide ores on the seafloor. Organic matter and sulphides are definitely products of a high-temperature alteration. The biomarker compounds indicate that the ores are formed under low Eh and pH conditions—a reducing to anoxic environment, which is favourable for sulphates to be reduced into sulphides by biogenic (bacterial) or abiogenic activity. 展开更多
关键词 Okinawa Trough sulphide ores organic matter biomarker
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Stabilising Cobalt Sulphide Nanocapsules with Nitrogen-Doped Carbon for High-Performance Sodium-Ion Storage 认领 引用 被引量：3
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作者 Yilan Wu Rohit RGaddam +4 位作者 Chao Zhang Hao Lu Chao Wang Dmitri Golberg Xiu Song Zhao 《Nano-Micro Letters》 SCIE EI CAS CSCD 2020年第4期29-40,共12页
Conversion-type anode materials with a high charge storage capability generally su er from large volume expansion, poor electron conductivity, and sluggish metal ion transport kinetics. The electrode material describe... Conversion-type anode materials with a high charge storage capability generally su er from large volume expansion, poor electron conductivity, and sluggish metal ion transport kinetics. The electrode material described in this paper, namely cobalt sulphide nanoparticles encapsulated in carbon cages(Co9S8@NC), can circumvent these problems. This electrode material exhibited a reversible sodium-ion storage capacity of 705 mAh g^-1 at 100 mA g^-1 with an extraordinary rate capability and good cycling stability. Mechanistic study using the in situ transmission electron microscope technique revealed that the volumetric expansion of the Co9S8 nanoparticles is bu ered by the carbon cages, enabling a stable electrode–electrolyte interface. In addition, the carbon shell with high-content doped nitrogen significantly enhances the electron conductivity of the Co9S8@NC electrode material and provides doping-induced active sites to accommodate sodium ions. By integrating the Co9S8@NC as negative electrode with a cellulose-derived porous hard carbon/graphene oxide composite as positive electrode and 1 M NaPF6 in diglyme as the electrolyte, the sodium-ion capacitor full cell can achieve energy densities of 101.4 and 45.8 Wh kg^-1 at power densities of 200 and 10,000 W kg^-1, respectively. 展开更多
关键词 Cobalt sulphide Nitrogen-doped carbon Core–shell structure Sodium-ion capacitors
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One Step Bioleaching of Sulphide Ore with Low Concentration of Arsenic by Aspergillus niger and Taguchi Orthogonal Array Optimization 认领 引用 被引量：2
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作者 Sadia Ilyas 池汝安 +1 位作者 Jae Chun Lee Haq Nawaz Bhatti 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第5期923-929,共7页
A study was carried out to examine the possibility for Aspergillus niger strain KBS4 to bioleach metals from sulphide ore with low concentration of arsenic and to optimize the parameters that affect this process by or... A study was carried out to examine the possibility for Aspergillus niger strain KBS4 to bioleach metals from sulphide ore with low concentration of arsenic and to optimize the parameters that affect this process by orthogonal array optimization. Fungal sample was collected, purified and sequenced. The bioleaching process was optimized with L25 Taguchi orthogonal experimental array design. Five factors were investigated and 25 batch bioleaching tests were run at five levels for each factor. The parameters were initial pH, particle size, pulp density, initial inoculums and residence time for bioleaching. The experimental results showed that under optimized leaching conditions: pH 5.5, particle size 180 μm, initial inoculums size 3×10 7 spores per ml, pulp density 15% and residence time of 20 days, the bioleach ability of metals were 63% Fe, 68% Zn, 60% As, 79% Cu and 54% Al. The biosorption of metal ions by fungal biomass might occur during the bioleaching process but it did not hinder the removal of metal ions by bioleaching. 展开更多
关键词 Aspergillus niger bioleaching sulphide ore orthogonal array
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FAULT TREE ANALYSIS OF SPONTANEOUS COMBUSTION OF SULPHIDE ORES AND ITS RISK ASSESSMENT 认领 引用 被引量：21
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作者 Wu Chao 《Journal of Central South University》 SCIE EI CAS 1995年第2期77-80,共4页
A logic fault tree of mine spontaneous combustion of sulphide ores was built by the fault tree analysis (FTA) based on a lot of mechanism investigation of sulphide ore spontaneous combustion in more than ten mines and... A logic fault tree of mine spontaneous combustion of sulphide ores was built by the fault tree analysis (FTA) based on a lot of mechanism investigation of sulphide ore spontaneous combustion in more than ten mines and review of a great amount of relevant 展开更多
关键词 fault tree analysis sulphide ores spontaneous combustion risk assessment
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Hydrogen sulphide detection using near-infrared diode laser and compact dense-pattern multipass cell 认领 引用 被引量：1
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作者 Xing Tian Yuan Cao +3 位作者 Jia-Jin Chen Kun Liu Gui-Shi Wang Xiao-Ming Gao 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第6期164-168,共5页
Sub-ppmv level detection of hydrogen sulphide(H2S)using a 1.578-μm distributed feedback tunable diode laser combining with wavelength modulation spectroscopy and second harmonic detection scheme is reported.A home... Sub-ppmv level detection of hydrogen sulphide(H2S)using a 1.578-μm distributed feedback tunable diode laser combining with wavelength modulation spectroscopy and second harmonic detection scheme is reported.A home-developed novel compact dense-pattern multipass gas cell with an effective optical path length of 29.37 m is used to improve sensitivity and reduce sample volume.Detection parameters are optimized,including modulation frequency and amplitude.The analysis of Allan variance shows that a minimum detectable concentration 60 ppbv is obtained with a lock-in time constant of 10 ms,and a detection limit of 13 ppbv can be achieved by average in 300 s.The demonstrated H2S sensor has a strong penitential application in natural gas process for regulating and controlling H2S concentration. 展开更多
关键词 hydrogen sulphide wavelength modulation spectroscopy second harmonic detection detection limit
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Ultrafine milling for the processing of gold-bearing sulphides 认领 引用 被引量：1
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作者 YANGHuaming HUYuehua +2 位作者 AOWeiqin QIUGuanzhou WANGDianzuo 《Rare Metals》 SCIE EI CAS 2002年第2期133-136,共4页
Ultrafine Milling technology is used to treat gold-bearingsulphides and to investigate the effects of minerals size, millingtime, liquid/solid ratio, NaCN consumption and leaching aid onleaching rate of gold. The resu... Ultrafine Milling technology is used to treat gold-bearingsulphides and to investigate the effects of minerals size, millingtime, liquid/solid ratio, NaCN consumption and leaching aid onleaching rate of gold. The results indicate that shorter treatingtime, decrease of NaCN consumption of 60/100 and increase of goldleaching rate of 15/100 can be ob- tained by the ultrafine millingtechnology compared with traditional cyanide leaching. Potentialexists for the new pro- cess to form the basis for an economicallyprocess for treatment of gold-bearing sulphides. 展开更多
关键词 gold-bearing sulphides ore procesing stirred mill ulrafine milling
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Study on sulphide capacity of CaO-SiO_2-Al_2O_3-MgO-Fe_tO slags 认领 引用 被引量：3
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作者 Chengli Wang Qing Lu +1 位作者 Shuhui Zhang Fumin Li 《Journal of University of Science and Technology Beijing》 2006年第3期213-217,共5页
The sulphide capacity of CaO-SiO2-Al2O3-MgO-FetO slags was studied at 1773 K using gas-slag equilibrium techniques. Utilizing a Pt crucible, the slag was equilibrated with a mixture of gases, namely, CO, CO2, SO2 and ... The sulphide capacity of CaO-SiO2-Al2O3-MgO-FetO slags was studied at 1773 K using gas-slag equilibrium techniques. Utilizing a Pt crucible, the slag was equilibrated with a mixture of gases, namely, CO, CO2, SO2 and N2 to provide the partial pressure of oxygen and sulphur. It was shown that at fixed FetO and Al2O3 contents and a fixed { （%CaO）＋（%MgO）}/（%SIO2） ratio, the sulphide capacity decreases with increasing MgO content. At a constant （%CaO）/（%SiO2） ratio and constant MgO and Al2O3 contents, increasing the FetO content of the slags also results in an increase of the sulphide capacity. The rising basicity of （%CaO）/（%SiO2） from 1.0 to 1.4 at fixed MgO, FetO and Al2O3 contents significantly increases the sulphide capacity. 展开更多
关键词 CaO-SiO2-Al2O3-MgO-FetO slags sulphide capacity gas-slag equilibrium
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Ar-Ar Dating of Baimazhai Nickel-Copper-(PGE) Sulphide Deposit and Its Significance, Southeast Yunnan Province, China 认领 引用 被引量：1
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作者 ZHANG Xue-shu QIN De-xian +1 位作者 Franco Pirajno NIAN Hong 《Journal of China University of Mining and Technology》 2006年第2期200-205,共6页
The Baimazhai Ni-Cu- (PGE) sulphide deposit in southeast Yunnan Province is hosted in mafic-ultramafic intrusions associated with the Permian Emeishan large igneous province. The deposit, one of several in the provinc... The Baimazhai Ni-Cu- (PGE) sulphide deposit in southeast Yunnan Province is hosted in mafic-ultramafic intrusions associated with the Permian Emeishan large igneous province. The deposit, one of several in the province, exhibits field and petrographic features suggestive of post-magmatic modification. The mafic-ultramafic intrusions that host the Baimazhai sulphide ores show near-pervasive to pervasive hydrothermal alteration, with the sulphides be- ing spatially associated with hydrothermal minerals such as biotite, amphibole and chlorite. This intimate association suggests that the sulphide ores were subjected to deformational and hydrothermal redistribution and textural changes resulting in disseminated and brecciated ores. Geochemically the Baimazhai sulphide ores are enriched in Cu, Pd and Au which, according to published studies, reflects the action of hydrothermal fluids. Interestingly, Ar-Ar age data yielded plateau ages of about 160-170 Ma, which also supports the modification features of the sulfide ores. 展开更多
关键词 mafic-ultramafic intrusions Ni-Cu-（PGE） mineralization Ar-Ar dating sulphide remobilization Baimazhai
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Indirect Spectrophotometric Determination of Sulphide with the Complex of Cd(Ⅱ)-5-Br-PADAP-CPB 认领 引用 被引量：1
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作者 Zhen Yu Zhang Wei An Liang 《Chinese Chemical Letters》 SCIE CAS 1997年第11期983-984,共2页
By the use of CPB, Cd(Ⅲ) forms a highly sensitive complex with 5-Br-PADAP in aqueous solution, molar absorptivity εis 1. 21 ×105 1. mol-1. cm-1.Trace amount of sulphide can be determined from its effect on the ... By the use of CPB, Cd(Ⅲ) forms a highly sensitive complex with 5-Br-PADAP in aqueous solution, molar absorptivity εis 1. 21 ×105 1. mol-1. cm-1.Trace amount of sulphide can be determined from its effect on the complex of Cd (Ⅲ)-5-Br-PADAP-CPB, sulphide in the range 0~3. 2 ×10-6mol dm-3 causes a decrease in absorption, that is a linear function of the concentration, For 13ng cm-3 sulphide, common metal ions such as Na+, K+, Ca2+, Mg2+, Al3+ and anions such as CO (24μg cm-3). S2O (22μg cm-3). PO (20μg cm-3) etc. do not interfere. A method for the indirect determination of sulphide in beer and in dustrial waste water with good selectivity and accuracy is described. 展开更多
关键词 CPB Br-PADAP-CPB Indirect Spectrophotometric Determination of Sulphide with the Complex of Cd
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Bioleaching of a kind of alkaline mixed copper oxide and sulphide mineral 认领 引用 被引量：2
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作者 黄明清 吴爱祥 《Journal of Chongqing University》 2010年第4期177-184,共8页
We conducted two-stage acidification-bioleaching experiments to probe the feasibility of bioleaching for a kind of mixed alkaline copper oxide and sulphide mineral. We used the uniform design method for data analysis ... We conducted two-stage acidification-bioleaching experiments to probe the feasibility of bioleaching for a kind of mixed alkaline copper oxide and sulphide mineral. We used the uniform design method for data analysis and experimental optimization, with initial pH value, pulp density, inoculation of bacteria and ferrous iron concentration selected as the influential factors. Polynomial regression shows that the four factors sequentially influence the copper recovery by 14.430%, 8.555%, 1.982% and 3.895%. Acid equilibrium in the bioleaching system is mainly influenced by alkaline gangue content, chemical reactions and bacterial activity. A maximal portion of refractory copper extracted reaches 71.08%. The dynamic analysis of copper recovery indicates that bioleaching goes through a lag leaching phase, prime leaching phase and leaching stationary phase corresponding to the growth phases of bacteria. Compared with the predicted value of 80.87%, the confirmatory experiment observes a 78.21% copper recovery under the optimal conditions of pH of 1.5, pulp density of 5%, bacteria inoculation of 30% and initial ferrous iron concentration of 9 g L-1. Results suggest that bioleaching is technically feasible to improving total copper recovery. 展开更多
关键词 alkaline mixed copper oxide and sulphide mineral bioleaching uniform design copper recovery acid equilibrium
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Recent Advance in the Electrochemical Detection of Sulphide and Sulphhydryl Species 认领 引用 被引量：2
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作者 Nathan S. Lawrence 1, Timothy G. J. Jones 2, Richard G. Compton 1 and Li Jiang 2 1. Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, OX1 3QZ, UK 2. Schlumberger Cambridge Research, High Cross, Madingley Road, Cambridge, 《Chemical Research in Chinese Universities》 SCIE EI CAS 2002年第2期161-168,共8页
This article aims at providing a critical review of some most recent developments in the electrochemical detection and measurement of hydrogen sulphide and the related species, which are of great significance to a var... This article aims at providing a critical review of some most recent developments in the electrochemical detection and measurement of hydrogen sulphide and the related species, which are of great significance to a variety of industries and in environmental moitoring. The molecular recognition processes are initiated by using either an organic precursor or a catalytic complex, leading to extensive ranges of detection. A series of advanced chemical and simulation techniques are used to probe the mechanistic details of the analytical chemistry involved. 展开更多
关键词 Advance, Electrochemical detection, Sulphide Sulphhydryl
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The Existence of the Negative Charge of Gold in Sulphide Minerals and Its Formation Mechanism 认领 引用 被引量：1
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作者 Li Jiuling, Feng Daming, Qi Feng and Zhang Guilan Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing Beijing U niversity of Science and Engineering, Beijing Fei Zhenbi 《Acta Geologica Sinica(English Edition)》 SCIE CAS 1995年第3期303-315,341,共13页
Through a study, particularly an X-ray photoelectron spectroscopy (XPS or ESCA) analysis, of gold-bearing arsenopyrite and pyrite in Carlin-type gold deposits of Guangxi, China, and hydrothermally synthesized gold-bea... Through a study, particularly an X-ray photoelectron spectroscopy (XPS or ESCA) analysis, of gold-bearing arsenopyrite and pyrite in Carlin-type gold deposits of Guangxi, China, and hydrothermally synthesized gold-bearing pyrite and marcasite, the authors have found that these minerals contain 'invisible gold' whose binding energy is lower than that of native gold (Au°). Therefore they suggest that gold occurs in a negative charge state in these sulphide minerals as it replaces some sulphur and is combined with sulphur with the covalent bond. This paper also preliminarily discusses the possibility of its formation from the chemistry and geochemistry of gold, crystal chemistry of arsenopyrite, pyrite and marcasite and geochemical environment. 展开更多
关键词 Carlin-type gold deposit sulphide invisible gold chemical bound gold negative charge of gold
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