• Calcium cyanide Wikipedia

    Overview
  • Cyanide control in the metallurgical process of gold

    Calcium cyanide is added at an addition rate of approximately 350 g/t Due to the large tonnage multiplier, this equates to approximately 1 000 (as 100% NaCN) tons of cyanide per month representing approximately 25% of the total operating cost Consequently a large amount of developmental work has been conducted at Ergo in regards to determining the optimum cyanide addition and to minimizing

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  • Effect of pH Alkalinity on Gold Leaching

    The role pH has in affecting gold leaching rates by cyanide and the functions of calcium hydroxide in cyanidation are as follow: 1 For safety and to prevent loss of cyanide by hydrolysis 2 To prevent loss of cyanide by the action of carbon dioxide in the air 3 To decompose bicarbonates in mill water before using it in cyanidation 4 To neutralize acidic compounds such as ferrous salts

  • Gold cyanidation Wikipedia

    Overview
  • The Metallurgy of Cyanide Gold Leaching – An Introduction

    20/10/2014· Liberation: Cyanide leaching will only be effective if the cyanide can come in contact with the gold particle For this to happen, the ore should either be sufficiently porous for cyanide to reach the gold, or more usually the ore is crushed and ground to a size at which the surface of the gold is exposed – ie the gold is liberated Mineralogy: A correct understanding of the mineralogical

  • CNLITE Ecofriendly Gold Leaching Reagent

    Constituent: Sodium Oxide, Ammonium, Nitrogen, Iron, Calcium, etc Usage: CNLITE is used in the same way as sodium cyanide in heap leaching, pool leaching and agitation leaching of gold ore The reagent can be dissolved in solution with gold cyanide extraction When used, the CNLITE gold leaching agent must be agitated with alkaline water at normal temperature and then dissolved in slurry for

  • Calcium cyanamide Wikipedia

    History In their search for a new process for producing cyanides for cyanide leaching of gold, Frank and Caro discovered the ability of alkaline earth carbides to adsorb atmospheric nitrogen at high temperatures Fritz Rothe, a colleague of Frank and Caro, succeeded in 1898 in overcoming problems with the use of calcium carbide and clarified that at around 1,100 °C not calcium cyanide but

  • Calcium cyanide | Ca(CN)2 PubChem

    Liquid and solid calcium cyanide are only produced in South Africa, where they are used for the leaching of precious metals from ores Gail E et al; Cyano Compounds, Inorganic Ullmann's Encyclopedia of Industrial Chemistry 7th ed (19992013)

  • Calcium cyanide Wikipedia

    Calcium cyanide also known as black cyanide, is the calcium salt of cyanide, an inorganic compound with the formula Ca(CN) 2The pure form is a white solid, although rarely observed; commercial samples can be blackgray It hydrolyses readily (even in moist air) to release hydrogen cyanideLike other similar cyanides it is very toxic

  • Calcium sulfide precipitation of mercury during cyanide

    The Resource Calcium sulfide precipitation of mercury during cyanide leaching of gold ores, by RG Sandberg, WW Simpson, and WL Staker

  • Cyanide control in the metallurgical process of gold

    Calcium cyanide is added at an addition rate of approximately 350 g/t Due to the large tonnage multiplier, this equates to approximately 1 000 (as 100% NaCN) tons of cyanide per month representing approximately 25% of the total operating cost Consequently a large amount of developmental work has been conducted at Ergo in regards to determining the optimum cyanide addition and to minimizing

  • Effect of pH Alkalinity on Gold Leaching

    The role pH has in affecting gold leaching rates by cyanide and the functions of calcium hydroxide in cyanidation are as follow: 1 For safety and to prevent loss of cyanide by hydrolysis 2 To prevent loss of cyanide by the action of carbon dioxide in the air 3 To decompose bicarbonates in mill water before using it in cyanidation 4 To neutralize acidic compounds such as ferrous salts

  • Cyanide Leaching Of Gold Mine

    The use of alkalies such as calcium oxide, will prevent the decomposition of cyanide in solution to form hydrogen cyanide gas It reduces the volume of cyanide required to leach the gold or silver In addition, hydrogen cyanide is highly toxic to people So, the few dollars spent on adding a cheap calcium oxide to the ore or solution, prior to leaching is worth the money spent Most cyanide

  • USA1 Process for recausticizing cyanide

    A method is shown for raising the pH of a cyanide leach solution of the type used in a heap leaching mining operation Lime slurry is mixed with a side stream of barren cyanide solution in a reactor vessel in order to remove carbonate hardness, to regenerate the hydroxide alkalinity and to raise the pH of the resulting recausticized leach solution

  • (DOC) VAT LEACHING AND ELUTION PLANT GOLD

    Leaching (Gold Dissolution)Once Vat is loaded with ore, is flooded with a leaching solution of a desired cyanide concentration (usually 600 to 1000 ppm) and pH between 10 to 11 at ambient operating conditions through the filter section of the floor or added to the top of the ore charge Picture 3: Left is the loading of tails read for leaching process, while right hand side is the picture of

  • CNLITE Ecofriendly Gold Leaching Reagent

    Constituent: Sodium Oxide, Ammonium, Nitrogen, Iron, Calcium, etc Usage: CNLITE is used in the same way as sodium cyanide in heap leaching, pool leaching and agitation leaching of gold ore The reagent can be dissolved in solution with gold cyanide extraction When used, the CNLITE gold leaching agent must be agitated with alkaline water at normal temperature and then dissolved in slurry for

  • Calcium cyanamide Wikipedia

    History In their search for a new process for producing cyanides for cyanide leaching of gold, Frank and Caro discovered the ability of alkaline earth carbides to adsorb atmospheric nitrogen at high temperatures Fritz Rothe, a colleague of Frank and Caro, succeeded in 1898 in overcoming problems with the use of calcium carbide and clarified that at around 1,100 °C not calcium cyanide but

  • Calcium cyanide | Ca(CN)2 PubChem

    Liquid and solid calcium cyanide are only produced in South Africa, where they are used for the leaching of precious metals from ores Gail E et al; Cyano Compounds, Inorganic Ullmann's Encyclopedia of Industrial Chemistry 7th ed (19992013)

  • The major role played by calcium in T gold plant circuits

    cyanide leach solution (see Table I), it seems that calcium aurocyanide could be slightly soluble As will be shown later, gold electrowinning is impossible from gold plant cyanide leach solutions containing calcium, indicating that calcium aurocyanide, if at all soluble, would not be significantly dissociated Therefore this compound can be considered to be nonionic and covalent in nature

  • Calcium sulfide precipitation of mercury during cyanide

    The Resource Calcium sulfide precipitation of mercury during cyanide leaching of gold ores, by RG Sandberg, WW Simpson, and WL Staker

  • Cyanide Leaching Of Gold Mine

    The use of alkalies such as calcium oxide, will prevent the decomposition of cyanide in solution to form hydrogen cyanide gas It reduces the volume of cyanide required to leach the gold or silver In addition, hydrogen cyanide is highly toxic to people So, the few dollars spent on adding a cheap calcium oxide to the ore or solution, prior to leaching is worth the money spent Most cyanide

  • THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION

    less robust than the cyanide leaching process, and is therefore more difficult to optimize and more sensitive to operate The leach process involves a chemical reaction between metallic gold and the thiosulphate anion, with oxygen as the oxidant, and ammonium and copper ions as unconsumed catalysts in the reaction One possible scheme for the overall reaction is presented below: 4Au + 8S 2

  • Ultimate Guide for Gold Cyanidation Process

    When leaching, gold (silver) dissolving capacity of cyanide (cyanide reagent) is: ammonium cyanide, calcium cyanide, sodium cyanide, potassium cyanide Potassium cyanide is the most expensive cyanide reagent Most gold cyanidation plants adopt sodium cyanide as the cyanide reagent The cyanide consumption depends on material property and operating factor (often 20 to 200 times of the

  • USA1 Process for recausticizing cyanide

    A method is shown for raising the pH of a cyanide leach solution of the type used in a heap leaching mining operation Lime slurry is mixed with a side stream of barren cyanide solution in a reactor vessel in order to remove carbonate hardness, to regenerate the hydroxide alkalinity and to raise the pH of the resulting recausticized leach solution

  • Thiosulfate as an Alternative Lixiviant to Cyanide for

    01/01/2016· A comparison cyanide leaching and thiosulfate of gold for various pressureoxidized materials is shown in Figure 2810 Thiosulfate conditions, which favored gold extractions similar to or better than cyanide leaching, varied for different POX residues Adding 10 g/L of sodium chloride to the autoclave, which converts the metallic gold in the ore to an ionic form during pressure oxidation

  • USA Leaching of copper from ores with

    Leaching of copper from ores with cyanide and recovery of copper from cyanide solutions Download PDF Info Publication number USA USA USA USA USA US A US A US A US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords copper cyanide

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