Numerous non-cyanide leaching lixiviants have been developed,among which thiosulfate is considered the most promising alternative to cyanide due to its non-toxicity,low price,high leaching rate and excellent character...Numerous non-cyanide leaching lixiviants have been developed,among which thiosulfate is considered the most promising alternative to cyanide due to its non-toxicity,low price,high leaching rate and excellent characteristics in dealing with carbonaceous and copper-bearing gold ores.The traditional copper−ammonia−thiosulfate system has been studied extensively.However,with many years of process development,there are still some problems and challenges with this gold leaching system.A series of studies using nickel-,cobalt-and ferric-based catalyst to substitute copper have been conducted with the purpose of reducing the consumption of thiosulfate.A variety of non-ammonia thiosulfate leaching systems including oxygen−thiosulfate,copper−thiosulfate,copper−EDA−thiosulfate,ferric−EDTA−thiosulfate,and ferric−oxalate−thiosulfate leaching systems have been also developed to eliminate the potential side-effect of ammonia.In this review,the basic theory and process development of some main gold leaching systems based on thiosulfate solutions were systematically summarized to illustrate the research status on thiosulfate leaching process.The potential effects of various additives such as organic ligands containing amino,carboxyl or hydroxy functional groups on gold thiosulfate leaching were described in detail.The potential opportunity and challenge for promoting the industrial development of thiosulfate-based gold leaching systems were also discussed.展开更多
This work focuses on the organic depressant,disodium bis(carboxymethyl)trithiocarbonate(DBT),as a selectivedepressant in copper?molybdenum sulfide flotation separation.Micro-flotation,Zeta potential,FTIR and XPS measu...This work focuses on the organic depressant,disodium bis(carboxymethyl)trithiocarbonate(DBT),as a selectivedepressant in copper?molybdenum sulfide flotation separation.Micro-flotation,Zeta potential,FTIR and XPS measurements werecarried out to investigate the selective depression mechanism of DBT on chalcopyrite.Zeta potential and FTIR measurementsrevealed that DBT had higher affinity for chalcopyrite than molybdenite and the XPS results of chalcopyrite before and aftertreatment with DBT further proved that DBT adsorbed on chalcopyrite surface.The investigation indicates that the mechanism ofDBT adsorbing on chalcopyrite is mainly physical adsorption.Locked circuit experiments were carried out and the results showedthat DBT could be considered as a cleaner option in commercial Cu?Mo flotation separation circuits.展开更多
Na-doped Li1.05Mn2O4 cathodes were synthesized using a sol-gel process.The samples were characterized by X-ray diffractometry(XRD),cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and charge-discharge...Na-doped Li1.05Mn2O4 cathodes were synthesized using a sol-gel process.The samples were characterized by X-ray diffractometry(XRD),cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and charge-discharge measurements. The results show that all the samples exhibit the same cubic spinel phase structure without impurity.The lattice constant and unit cell volume decrease with increasing the sodium dopant amount.As the molar ratio of sodium to manganese(x=n(Na)/n(Mn))increases from 0 to 0.03,the initial discharge capacity of the Li1.05Mn2O4 cathodes decreases from 119.2 to 107.9 mA·h/g,and the discharge capability at large current rate and the storage performance decline dramatically,while cycling performance at room temperature and 55℃are improved.The CV and EIS studies indicate that reversibility of Li1.05Mn2O4 cathodes decreases and the electrochemical impedance increases with increasing the sodium dopant amount.展开更多
基金financial supports from the Fundamental Research Funds for Central Universities of China (No. N182502044)。
文摘Numerous non-cyanide leaching lixiviants have been developed,among which thiosulfate is considered the most promising alternative to cyanide due to its non-toxicity,low price,high leaching rate and excellent characteristics in dealing with carbonaceous and copper-bearing gold ores.The traditional copper−ammonia−thiosulfate system has been studied extensively.However,with many years of process development,there are still some problems and challenges with this gold leaching system.A series of studies using nickel-,cobalt-and ferric-based catalyst to substitute copper have been conducted with the purpose of reducing the consumption of thiosulfate.A variety of non-ammonia thiosulfate leaching systems including oxygen−thiosulfate,copper−thiosulfate,copper−EDA−thiosulfate,ferric−EDTA−thiosulfate,and ferric−oxalate−thiosulfate leaching systems have been also developed to eliminate the potential side-effect of ammonia.In this review,the basic theory and process development of some main gold leaching systems based on thiosulfate solutions were systematically summarized to illustrate the research status on thiosulfate leaching process.The potential effects of various additives such as organic ligands containing amino,carboxyl or hydroxy functional groups on gold thiosulfate leaching were described in detail.The potential opportunity and challenge for promoting the industrial development of thiosulfate-based gold leaching systems were also discussed.
基金Project(2016zzts109)supported by the Innovation Driven Plan of Central South University,ChinaProject(B14034)supported by the National 111 Project,China
文摘This work focuses on the organic depressant,disodium bis(carboxymethyl)trithiocarbonate(DBT),as a selectivedepressant in copper?molybdenum sulfide flotation separation.Micro-flotation,Zeta potential,FTIR and XPS measurements werecarried out to investigate the selective depression mechanism of DBT on chalcopyrite.Zeta potential and FTIR measurementsrevealed that DBT had higher affinity for chalcopyrite than molybdenite and the XPS results of chalcopyrite before and aftertreatment with DBT further proved that DBT adsorbed on chalcopyrite surface.The investigation indicates that the mechanism ofDBT adsorbing on chalcopyrite is mainly physical adsorption.Locked circuit experiments were carried out and the results showedthat DBT could be considered as a cleaner option in commercial Cu?Mo flotation separation circuits.
基金Project(2007CB613607) supported by the National Basic Research Program of ChinaProjects(2009FJ1002, 2009CK3062) supported by the Science and Technology Program of Hunan Province, China
文摘Na-doped Li1.05Mn2O4 cathodes were synthesized using a sol-gel process.The samples were characterized by X-ray diffractometry(XRD),cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and charge-discharge measurements. The results show that all the samples exhibit the same cubic spinel phase structure without impurity.The lattice constant and unit cell volume decrease with increasing the sodium dopant amount.As the molar ratio of sodium to manganese(x=n(Na)/n(Mn))increases from 0 to 0.03,the initial discharge capacity of the Li1.05Mn2O4 cathodes decreases from 119.2 to 107.9 mA·h/g,and the discharge capability at large current rate and the storage performance decline dramatically,while cycling performance at room temperature and 55℃are improved.The CV and EIS studies indicate that reversibility of Li1.05Mn2O4 cathodes decreases and the electrochemical impedance increases with increasing the sodium dopant amount.
