• (PDF) Ammoniacal thiosulfate leaching of gold from a

    In the leaching of a sulphide ore, the leaching kinetics and overall extractions of gold and silver were enhanced substantially, while the consumption of ammonium thiosulphate

  • 预计阅读时间:10 分钟
  • Thiosulfate leaching of gold—A review ScienceDirect

    Thiosulfate leaching can be considered a nontoxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceoustype ores In addition, thiosulfate can be cheaper than cyanide

  • Cited by: 556
  • Thiosulfate leaching of gold—A review ScienceDirect

    Presented at SME Annual Meeting, Phoenix, Arizona system for precious metals recovery, in Proceedings of XIX, 1995 Li Y and Zhang W, Process development for ammoniacal thiosulphate leaching of gold and silver from complex sulphides concentrates containing precious metals, Nonferrous Metals (China), 1989, 41, (3) 6771 (Chinese) (Abstract)

  • Cited by: 556
  • Sodium Thiosulphate Gold Leaching

    The gold industry has been seeking alternative reagents for leaching gold from lowgrade ores for the past 25 years The cost and transport of cyanide, the poor recovery of gold from carbonaceous ores, the lack of selectivity of cyanide towards copper minerals and the cost of waste treatment are real factors which can make cyanide unattractive in some circumstances

  • Oxidative pretreatment in thiosulphate leaching of

    Thiosulphate gold leaching has received much attention as an alternative technology to the cyanidation of gold ores in recent years due to the growing environmental and public concerns over the use of cyanide Acceptable gold leaching rates using thiosulphate have been achieved in the presence of ammonia with cupric ion acting as the oxidant

  • Cited by: 21
  • Ammoniacal thiosulphate leaching of gold ore

    Figure 1 Ammoniacal thiosulphate leaching of Akeshi and Hishikari gold ores a) as a function of time and b) as a function of pH and E h (Thiosulphate concentration, 05M; Ammonia concentration, 1M) 32 Effect of thiosulphate The results of effect of thiosulphate concentration on leaching are portrayed in Figure 2 In these

  • LR Freitas, RBE Trindade and T Carageorgos

    LR Freitas, RBE Trindade and T Carageorgos THIOSULPHATE LEACHING OF GOLDCOPPER ORES FROM IGARAPE BAHIA MINE (CVRD) LR Freita/ RBE Trindade2 and T Carageorgos3 1Centre of Technology, Companhia Vale do Rio Doce, Santa LuziaMO, Brazil 2CETEM/MCT, Rio de JaneiroRJ, Brazil

  • COMPARISON OF CYANIDE AND THIOSULPHATE

    Thiosulphate leaching can be considered as a nontoxic process It has its own pros and cons which have been discussed in this work The topics of this work are gold ores and their suitability for leaching processes, pretreatment of concentrate, leaching chemistry and

  • 文件大小: 973KB
  • Sorption recovery of gold from thiosulphate solutions

    Gold recovery from arsenopyrite coaly hard concentrates obtained by ore flotation concentration has been studied The thiosulphate leaching of the products obtained after the chemical preparation of the concentrates was carried out in the system Na 2 S 2 O 3 –NH 3 –H 2 O at 20–22°C The gold recovery on ion exchangers and carbon adsorbents from the thiosulphate solutions was

  • Cited by: 23
  • Thiosulphate Leaching | SGS

    Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign

  • LR Freitas, RBE Trindade and T Carageorgos

    LR Freitas, RBE Trindade and T Carageorgos THIOSULPHATE LEACHING OF GOLDCOPPER ORES FROM IGARAPE BAHIA MINE (CVRD) LR Freita/ RBE Trindade2 and T Carageorgos3 1Centre of Technology, Companhia Vale do Rio Doce, Santa LuziaMO, Brazil 2CETEM/MCT, Rio de JaneiroRJ, Brazil

  • The role of ligands and oxidants in thiosulfate

    Analysis of initial rate data over the first 30–60min of gold leaching from sulphide concentrates or silicate ores over a range of ammonia, thiosulphate, and copper(II) concentrations, pH (9

  • Biooxidationthiosulfate leaching of refractory gold

    A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated Mineralogical studies on the concentrate showed that very fine gold grains (<10 µm) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21% The goldbearing sample was identified as a highsulfur finesized wrappedtype refractory gold

  • Biooxidation‒thiosulfate leaching of refractory gold

    A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated Mineralogical studies on the concentrate showed that very fine gold grains (<10 μm) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21% The goldbearing sample was identified as a highsulfur finesized wrappedtype refractory gold

  • (PDF) Thiosulphate leaching for gold hydrometallurgy

    ConclusionsAccurate cost data on this process are not available in the literature since it is a novel technology investigated up to now only on a laboratory scaleThe investigation camed out has permitted a preliminarly evaluation of the feasibility of the thiosulphate leaching for the recovery of gold from Dominican Republic oresThe treatment

  • Gold strike with thiosulphate

    Thiosulphate has long been seen as a potential alternative to cyanide for liberating gold from ores, but until now it has proved difficult to master Cyanide is highly toxic and an environmental

  • (PDF) Thiosulfate leaching of gold from waste mobile

    Thiosulfate leaching of gold from waste mobile phones Ha VH, Lee JC, Jeong J, Hai HT, Jha MK Institute for Environmental Science and Technology, Hanoi University of Technology (HUT), 1 Dai Co Viet, Hanoi, Viet Nam; Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), 92, Gwahangno, Yuseonggu, Daejeon 305350, South Korea; Metal

  • HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES AND

    Hydrometallurgy of gold 67 Thiosulphate The first reported use of thiosulphate for precious metal extraction dates back to the beginning of the century In that method, known as Patera’s process, the ore was first roasted in a chloride atmosphere and just after a thiosulphate leaching was used to recover gold and silver (Zipperian et al 1988)

  • The Effects of Common Associated Sulfide Minerals

    The effects of common associated sulfide minerals including pyrite, arsenopyrite, galena and sphalerite on thiosulfate leaching of gold were studied in this work Sulfide minerals had significant effects on gold leaching because that the dissolved products of sulfide minerals precipitated on gold surface to

  • Thiosulphate Leaching | SGS China

    Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign

  • (PDF) Thiosulphate leaching for gold hydrometallurgy

    ConclusionsAccurate cost data on this process are not available in the literature since it is a novel technology investigated up to now only on a laboratory scaleThe investigation camed out has permitted a preliminarly evaluation of the feasibility of the thiosulphate leaching for the recovery of gold from Dominican Republic oresThe treatment

  • Biooxidationthiosulfate leaching of refractory gold

    A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated Mineralogical studies on the concentrate showed that very fine gold grains (<10 µm) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21% The goldbearing sample was identified as a highsulfur finesized wrappedtype refractory gold

  • Review of rate constants for thiosulphate leaching of

    A review of literature data for different types of sulphide concentrates and gold ores has been carried out to examine the impact of host minerals and pH upon gold leaching Analysis of initial rate data over the first 3060 min of gold leaching from sulphide concentrates or silicate ores over a range of ammonia, thiosulphate, and copper(II) concentrations, pH (9105) and temperatures up to

  • Gold recovery from thiosulfate leaching The

    Processes for recovering gold from coppergold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed The processes include subjecting the goldbearing and copperbearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the

  • Thiosulphate Stability In Gold Leaching Process

    Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide The current problem of thiosulphate gold leaching is the high reagent consumption, To understand the decomposition chemistry of thiosulphate, solution stability tests were conducted in open and sealed vessek mder ambient temperature

  • In place leaching of oxidized gold deposits A new

    thiosulphate as lixiviant, ferric as oxidant and thiourea as a catalyst for gold oxidation might be usable for anaerobic leaching of gold ores This work also indicated that the presence of pyrite results in rapid catalysed oxidation of the sodium thiosulphate rendered the method ineffective in the

  • HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES AND

    Hydrometallurgy of gold 67 Thiosulphate The first reported use of thiosulphate for precious metal extraction dates back to the beginning of the century In that method, known as Patera’s process, the ore was first roasted in a chloride atmosphere and just after a thiosulphate leaching was used to recover gold and silver (Zipperian et al 1988)

  • The Effects of Common Associated Sulfide Minerals

    The effects of common associated sulfide minerals including pyrite, arsenopyrite, galena and sphalerite on thiosulfate leaching of gold were studied in this work Sulfide minerals had significant effects on gold leaching because that the dissolved products of sulfide minerals precipitated on gold surface to

  • INFIELD TESTING AND VALIDATION OF THIOSULPHATE:

    recovery of leachable gold, taking into account the economics of longer leach residency time vs diminishing gold recovery returns This KPI in particular has been met with resounding success—the thiosulphate leaching solution led to an 85% gold recovery rate Note: This project was initiated using vat leaching tanks in the process

  • broken machine powder machine crusher sphalerite ball mill new spinning mills projects in rajapalayam diy hammer pellet mill plans diatomite processing earth apa arti alat ukur gyratory crusher energy balance around a crusher portable jaw crusher for sale kenya vibro screen Crusher Of Activated Carbon Process for sale knelson gold concentrators work black color meanings how to use shades of black robo sand making crusher machinery rates in philippines chinese quarry and stone crushing machines sand making process and equipments coal mine conveyors systems zimbabwe small scale mining modern aggregate crushing plants harga penutupan penghancur beton foto ponsel stone silica crushing screening plants sand making production line Peru stone crushers brazilian brand small scale roll crushers mining firefighting courses offered in south africa rock crusher control room used coal impact crusher provider indonesia dissused mines for sale indonesia coal company umunda iron ore mine Pet Bottle Crushing Mechene Suppliers In Kerala coal crushing plant pdf granite mining lease or own