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sodium hypochlorite gold leaching

sodium hypochlorite gold leaching

sodium hypochlorite gold leaching
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Hypochlorite Leaching of Gold Ore Leaching pure gold with an acidic sodium hypochlorite solution has been demonstrated to be effective The initial rate of gold

sodium hypochlorite gold leaching

  • Hypochlorite Leaching of Gold Ore

    Leaching pure gold with an acidic sodium hypochlorite solution has been demonstrated to be effective The initial rate of gold dissolution was extremely rapid In a leaching solution containing 1 g/L NaCl, 1 % HCl and 2 % NaOCl, nearly 90 % of the gold was extracted in only 30 minutesFig 5 shows the effect of sodium hypochlorite concentration on gold extraction from a free milling ore The concentration of 20 % hydrochloric acid and 20 g5 sodium chloride was maintained for each test When the ore was leached with 9 0 O d2 " 4 " 6Advances in Gold and Silver ProcessingTwostage leaching was carried out: first to eliminate manganese from the sample using sodium sulfite (Na 2 SO 3) as a reductive reagent and sulfuric acid (H 2 SO 4) and a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl); the results show extraction around 96% for Mn and 9873% and 83% of Ag and Au, respectivelyDissolution of Silver and Gold with Sodium Hypochlorite

  • How to Use Bleach on Gold Ore to Remove Gold | Sciencing

    Bleach is the chemical compound sodium hypochlorite When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from gold ore This was the first commercial method used for goldDirect hypochlorite leaching of the sulfidic concentrate yielded gold and silver recoveries of 43% and 45%, respectively After pressure oxidation of the concentrate and subsequent hypochlorite leaching, the recoveries increased to 90% for gold and 93% for silverLeaching of an oxide gold ore with chloride/hypochloriteAfter pressure oxidation of the concentrate and subsequent hypochlorite leaching, the recoveries increasedto 90% for gold and 93% for silver In contrary toreducing ores and concentrates, some ores may naturallycontain oxidizing agents, such as MnO2 Gold in thesetypes of materials can be leached with an NaCl/acidsolution only Since the oxidant Cl2/HClO is formed insitu upon reaction of Cl−and MnO2(Leon and Quispe,1986), for insitu chlorine/hypochlorous acid formation,MnO2have been used in NaCl and H2SO4solution toleach goldLeaching of an oxide gold ore with chloride/hypochlorite

  • DISSOLUTION OF SILVER AND GOLD WITH SODIUM

    Twostages leaching was carried out, first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4), a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl), the results shows extraction around 96% for Mn, 9873% and 83% of Ag and Au respectivelyTherefore, the current work aims at investigating gold leaching from an oxidized material by means of a solution comprising calcium hypochlorite and sodium chlorite The sample used in the current research contained 661% Fe 2 O 3 , 204% SiO 2 , and 357 g/t of AuGold Leaching by Sodium Chloride and CalciumThe results showed that the gold corrosion rate first increased and then decreased with the augment of sodium hypochlorite concentrations The gold anode started to passivate at the concentration of 075 mol/L The outcomes of the actual leaching experiments次氯酸钠浸金电化学及难浸金矿浸出实验研究

  • Leaching of Chalcopyrite with Sodium Hypochlorite

    Puvvada and Murthy [6] during leaching of gold from a chalcopyrite concentrate reported that the gold dissolution rate is independent of the level of sodium hypochlorite (NaOCl) within the 2575 gGold extraction was shown to be dependent on sodium hypochlorite concentration, heap leach flowrate, temperature and leaching time or bed volumes Optimum leaching conditions were 10°C and below utilizing a 10 percent sodium hypochlorite solution at a flowrate of 15 gal/ft2 •day or greater for 2 to 13 bed volumes depending on the effluentSodium hypochlorite pretreatment for heap leaching goldTwostages leaching was carried out, first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4), a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl), the results shows extraction around 96% for Mn, 9873% and 83% of Ag and AuDISSOLUTION OF SILVER AND GOLD WITH SODIUM

  • 次氯酸钠浸金电化学及难浸金矿浸出实验研究

    The results showed that the gold corrosion rate first increased and then decreased with the augment of sodium hypochlorite concentrations The gold anode started to passivate at the concentration of 075 mol/L The outcomes of the actual leaching experimentsCalcium hypochlorite produced a sluggish gold leaching kinetics, requiring twice more time (46 h) to achieve the maximum gold recovery of 58% compared to sodium hypochlorite To have a reasonable gold leaching kinetics, it was found that OCl − in solution must be equal or higher than 10 g/L The amount of HCl added and hence initial pH wasLeaching of an oxide gold ore with chloride/hypochloritekinetics, taking twice the time (46 h) to achieve maximum gold recovery of 58% compared to sodium hypochlorite 10 g/L of total initial hypochlorite species in solution produces reasonable gold recoveries The amount of added HCl and hence the initial pH was found to have a major effect on gold leaching kinetics and maximum gold recoveryLeaching of an oxide gold ore with chloride/hypochlorite

  • HYPOCHLORITE GOLD LEACHING AN ALTERNATIVE TO

    Two series of experiments were carried out to study sodium hypochlorite as a gold leaching agent using a traditional gold disk and finely dispersed native gold as dissolution objects Found fundamental differences in methodological techniques when working with a traditional model object and native goldGold is an almost nonreactive metal, but halogens — chlorine, bromine, fluorine and iodine — can dissolve it Chlorine is the cheapest and lightest product that can achieve this Bleach is the chemical compound sodium hypochlorite When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from goldHow to Use Bleach on Gold Ore to Remove Gold | SciencingThe process uses sodium hypochlorite with a catalytic amount of sodium hypobromite in acidic conditions to put the gold into solution “Contact time is short, and the process operates in a thiosulphatebased reagent system for gold leaching that, according to the organisation, hasGOLD EXTRACTION

  • How to Improve the Effect of Gold Cyanide Leaching?

    Chemical mineral processing method: Using the sodium hypochlorite to make the gold ore oxidize in the alkaline medium at 50~60℃ Otherwise, adopting the roasting method to oxidize the carbon to carbon monoxide and carbon dioxide, and then the gold is extracted by the cyanide leaching so the gold leaching rate is relatively high InIn this research, oxidation of sulfide minerals and leaching of gold from a gold–bearing sulfide concentrate using chloride–hypochlorite solution was investigated The effects of calcium hypochlorite concentration, sodium chloride concentration and initial pH of leachant on changes of the slurry pH and Eh were examinedChloride–hypochlorite oxidation and leaching of refractoryElectrochemical Profile of Leaching Gold with Sodium Hypochlorite and Experiment on Leaching A Refractory Gold Ore CHEN Liang 1, 2, TANG Daowen 1, 2 *, GUAN Guichao 1, GAO Peng 1, YAN Pu 1, LIU Xianchao 1 (1 College of Materials and Metallurgy2次氯酸钠浸金电化学及难浸金矿浸出实验研究 j

  • 次氯酸钠浸金电化学及难浸金矿浸出实验研究

    The results showed that the gold corrosion rate first increased and then decreased with the augment of sodium hypochlorite concentrations The gold anode started to passivate at the concentration of 075 mol/L The outcomes of the actual leaching experimentssodium thiosulphate And hypochloride leaching Hi all i am new to the forum, and dont seem to find any info on thipsulphate leaching / hypochloride leaching of a sulphide gold ore could someone point me in the correct direction! i need to choose one of 2methods above based on its simplicitu Last edited by labalkeny on June 14th,sodium thiosulphate And hypochloride leaching GoldGold is an almost nonreactive metal, but halogens — chlorine, bromine, fluorine and iodine — can dissolve it Chlorine is the cheapest and lightest product that can achieve this Bleach is the chemical compound sodium hypochlorite When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from goldHow to Use Bleach on Gold Ore to Remove Gold | Sciencing

  • GOLD EXTRACTION

    The process uses sodium hypochlorite with a catalytic amount of sodium hypobromite in acidic conditions to put the gold into solution “Contact time is short, and the process operates in a thiosulphatebased reagent system for gold leaching that, according to the organisation, hasTitle in English HYPOCHLORITE GOLD LEACHING AN ALTERNATIVE TO CYANIDE TECHNOLOGY English abstract Traditional technologies of gold mining are exhausted due to the depletion of stocks of conditioned raw materials at functioning gold mining enterprises, in addition, the preservation or disposal of largescale waste of these technologies requires significant financial costs for environmentalHYPOCHLORITE GOLD LEACHING AN ALTERNATIVE TOdissolution of manganese under reductive conditions was carried out, followed by leaching with hydrochloric acid (HCl) and sodium hypochlorite (NaClO) using sodium sulfite (Na 2 SO 3) and sulfuric acid (H 2 SO 4) as reductive agents in a pretreatment phaseTo study the dissolution of silver and gold, the following variables were considered: leaching time, type of reductive reagent, oxidationDissolution of Silver and Gold with Sodium Hypochlorite

  • Recovery of Platinum, Palladium, and Gold From

    peroxide, chlorine, sodium hypochlorite, nitric acid, and a persulfate salt were the oxidants investigated The twostage leaching scheme ex­ tracted up to 97 pct of the platinum, 92 pct of the palladium, and 99 pct of the gold from the roasted concentrate The base metals were not solubilized and reported toThe results show that the gold leaching rate is above 41% under the optimum conditions including leaching temperature of 50 ℃, leaching time of 3 h and ratio of solid to liquid of 4 Key words: cyanide residue; leaching; sodium chloride; sodium hypochlorite 氰化渣含金量在2~6 g/t,是潜在的二次资氯化钠次氯酸钠法浸金docThey will adsorb the dissolved gold and then precipitate it again, thereby reducing the gold leaching rate Solution Chemical mineral processing method: The carbon can be oxidized by adding sodium hypochlorite in alkaline medium at 50~60℃ under stirring condition Or using roasting method to oxidize carbon into carbon monoxide and carbon4 Reasons and Solutions of Poor Gold Leaching Effect