effect of cyanide in dissolution of gold

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effect of cyanide in dissolution of gold

effect of cyanide in dissolution of gold

  • Cyanide Gold Dissolution Mineral Processing Metallurgy

    Manufacturing CyanideTypes of Cyanide and Cyanide ConsumptionPutting Gold Into Solution with CyanideFactors in Dissolution of Gold and SilverDissolution of Gold as A Corrosion ProcessDissolution of SilverCyanidationSodium cyanide is a white, deliquescent, crystalline material easily soluble in water The basic sources are alkalis or alkaline earths, atmospheric nitrogen, and carbon In the United States it is derived (1) from sodamide which is produced from sodium and ammonia The sodamide is heated with charcoal, and the resultant soda cyanamid is then heated with an excess of charco
  • the effect of cyanide in the gold dissolution

    (PDF) Gold dissolution and activation in cyanide solution This paper examines the kinetics of gold dissolution using a rotating disk electrode in clear cyanide solution without activator and in the presence of the activator NMI A simple reaction mechanism that explains the effect of cyanide oxygen and activator is proposed

  • Gold Metallurgy Leaching in Cyanicides

    14/07/2016  It is shown that the reaction between cyanide and the sulphides present in an ore is accelerated by increase in temperature While the rate of dissolution of gold is also increased, this effect is more than offset by the oxidation of the sulphur compounds and utilization of available oxygen It is proposed to cool the working cyanide solution to 35 to 50°F for

  • Temps de Lecture Estimé: 11 mins
  • Cyanide Leaching Chemistry Gold Cyanidation

    06/02/2015  Quite often the gold in an ore is tarnished, or as it is termed “rusty” This brownish tarnish or coating very often consists of oxides of iron, but black coated gold is not unusual The effect of such coverings on the gold particles is to retard dissolution and usually to increase the gold content of the cyanidation residue This gold is not only refractory to cyanidation, it is also

  • (PDF) Effect of Particle Size and Grinding Time on Gold

    07/07/2016  The results show that the gold dissolution kinetic reaction orders are approximately two for gold, one for free cyanide and a quarter for dissolved oxygen, and that the kinetic rate constant is a

  • Temps de Lecture Estimé: 7 mins
  • the effect of cyanide in the gold dissolution

    (PDF) Gold dissolution and activation in cyanide solution This paper examines the kinetics of gold dissolution using a rotating disk electrode in clear cyanide solution without activator and in the presence of the activator NMI A simple reaction mechanism that explains the effect of cyanide oxygen and activator is proposed

  • Effect of oxygen on gold cyanidation: laboratory results

    01/06/1992  Effect of oxidant on tb, kinetics of gold dissolution The effect of the type of oxidant on cyanide consumption for sample C is indicated in Fig 9 Compared to the average value of Tests 1 and 3, the use of oxygen during preaeration only (Test 2) resulted in a 36% reduction in NaCN consumption For Test 4 the reduction in cyanide consumption was only 18% The cyanide consumption in Test 4

  • Anodic Dissolution of Gold in Cyanide Solutions Containing

    The effect of the electrode potential on the gold dissolution rate in alkali–cyanide solutions with and without 10 –5 M of hydroxy compounds of lead is studied With the compounds, the process rate passes through a maximum, whose potential E m shifts in the negative direction and whose height drops with increasing pH The pH dependence of E m is linear, with the slope dE m /dpH = –71 ±

  • 4 Reasons and Solutions of Poor Gold Leaching Effect

    22/06/2020  Some gold ores are accompanied by copper and zinc minerals, such as malachite, azurite, pyrocopper and sphalerite (especially oxidized sphalerite), etc, which have high solubility in cyanide solution While leaching gold, they will “compete” with gold for cyanide and oxygen, thus hindering the dissolution of gold and reducing the

  • effect of cyanide in dissolution of gold

    Cyanide Leaching Chemistry amp Gold Cyanidation The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows 4 Au 8 NaCN O2 2 H20 4 NaAuCN2 4 NaOH

  • Biogenic Cyanide Production Promotes Dissolution of Gold

    Gold nanoparticles (Au NPs) are often used to study the physiochemical behavior and distribution of nanomaterials in natural systems because they are assumed to be inert under environmental conditions, even though Au can be oxidized and dissolved by a common environmental compound: cyanide We used Biogenic Cyanide Production Promotes Dissolution of Gold Nanoparticles in Soil

  • effect of cyanide in dissolution of gold

    minerals Article Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution Jessica Egan 1, Claude Bazin 2,* and Daniel Hodouin 2 Inquire Now; effect of cyanide in dissolution of gold Cyanide Gold Dissolution Mineral Processing amp; Extractive A study was made of the effect of varying alkalinity on the rate of

  • effect of cyanide in dissolution of gold

    Gold Silver Dissolution and Cyanide Concentration 2017/03/17 Effect of Cyanide Concentration on Rate of Gold and Silver Dissolution The rate of dissolution of gold in cyanide solutions attains a maximum in passing from concentrated to dilute solutions His work shows that this maximum is reached at a solution concentration of 025% NaCN

  • (PDF) Reactions of gold and sulfide minerals in cyanide media

    The effect of pyrite, pyrrhotite, chalcopyrite, realgar and arsenopyrite on gold dissolution in cyanide media was investigated The cyanidation of synthetic gold ores in the presence of various

  • EFFECT OF VARIOUS PROCESS PARAMETERS, Effect of ЕhpH on

    The effect of various process parameters on the efficiency of gold leaching in cyanide solution has been widely discussed and studied Effect of ЕhpH on Cyanidation Figure 46 presents the aqueous chemistry of precious metal in cyanide solution and shows that Au(CN),, aurouscyanide ions occur predominantly in the wider pH range while the Au ,+ auric, ions are in a very limited area

  • the effect of cyanide in the gold dissolution

    (PDF) Gold dissolution and activation in cyanide solution This paper examines the kinetics of gold dissolution using a rotating disk electrode in clear cyanide solution without activator and in the presence of the activator NMI A simple reaction mechanism that explains the effect of cyanide oxygen and activator is proposed

  • effect of cyanide in dissolution of gold

    Cyanide Leaching Chemistry amp Gold Cyanidation The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows 4 Au 8 NaCN O2 2 H20 4 NaAuCN2 4 NaOH

  • effect of cyanide in dissolution of gold

    Gold Silver Dissolution and Cyanide Concentration 2017/03/17 Effect of Cyanide Concentration on Rate of Gold and Silver Dissolution The rate of dissolution of gold in cyanide solutions attains a maximum in passing from concentrated to dilute solutions His work shows that this maximum is reached at a solution concentration of 025% NaCN

  • Biogenic Cyanide Production Promotes Dissolution of Gold

    Gold nanoparticles (Au NPs) are often used to study the physiochemical behavior and distribution of nanomaterials in natural systems because they are assumed to be inert under environmental conditions, even though Au can be oxidized and dissolved by a common environmental compound: cyanide We used Biogenic Cyanide Production Promotes Dissolution of

  • Kinetic Investigation and Dissolution Behavior of Cyanide

    10/05/2019  Cyanide dissolves gold by forming a soluble dicyanoaurat complex (Eq 1) The presence of oxygen is essential for the gold dissolution To avoid the formation of volatile hydrogen cyanide HCN, the

  • Biogenic Cyanide Production Promotes Dissolution of Gold

    Gold nanoparticles (Au NPs) are often used to study the physiochemical behavior and distribution of nanomaterials in natural systems because they are assumed to be inert under environmental conditions, even though Au can be oxidized and dissolved by a common environmental compound: cyanide We used the cyanogenic soil bacterium, Chromobacterium violaceum, to

  • Effect of zinc minerals on cyanide leaching for gold ores

    17/07/2020  Zinc sulphide and cyanide solution react slightly to form cyanide and thiocyanateThe dissolution rate of various zinc minerals in cyanide solution is shown in Table 124The effect of zinc minerals on gold dissolution is not as strong as that of copper minerals, but when the content of dissolved zinc in cyanide solution is greater than 003 ~ 01%, it has a

  • (PDF) Electrochemistry of conventional gold cyanidation

    1 The effect of cyanide concentration was determined by measuring the gold dissolution rate at pH 115, 400 min ‘, 25°C and cyanide concentrations in the range of 25 mM As shown in Fig 2, cyanide concentration strongly affects gold dissolution rate At low cyanide concentrations, the cyanidation rate is proportional to the initial cyanide concentration When it reaches values

  • EFFECT OF VARIOUS PROCESS PARAMETERS, Effect of ЕhpH on

    The effect of various process parameters on the efficiency of gold leaching in cyanide solution has been widely discussed and studied Effect of ЕhpH on Cyanidation Figure 46 presents the aqueous chemistry of precious metal in cyanide solution and shows that Au(CN),, aurouscyanide ions occur predominantly in the wider pH range while the Au ,+ auric, ions are in a

  • Analysis of Factors Affecting Heap Leaching Process of

    01/09/2017  29 Effect of temperature on heap leaching process The dissolution rate of gold in cyanide solution increases with the increasing of temperature and reaches the maximum at about 85 ℃ When it