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  • Hypochlorite Leaching of Gold Ore Metallurgist &

    2020-06-08· 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 minutes.

  • Molybdenum removal from copper ore concentrate by

    The removal of molybdenum from a copper ore concentrate by sodium hypochlorite leaching was investigated. The results show that leaching time, liquid to solid ratio, leaching temperature, agitation speed, and sodium hypochlorite and sodium hydroxide concentrations all have a significant effect on the removal of molybdenum.

  • Advances in Gold and Silver Processing

    2016-08-03· HYPOCHLORITE LEACHING OF GOLD ORE 69 Overall reaction of equations (I), (2) and (3) can be summarized as follows: It is obvious that both hydrochloric acid and sodium chloride have affected the gold dissolution in hypochlorite solution. RESULTS AND DISCUSSION Gold Precipitate The dissolution of gold in dilute hypochlorite solution is very slow.

  • (PDF) Detoxification of Cyanide in a Gold Processing Plant

    Detoxification of Cyanide in a Gold Processing Plant Tailings Water Using Calcium and Sodium Hypochlorite Article (PDF Available) in Mine Water and the Environment 27(1):52-55 · January 2008 with

  • Leaching of an oxide gold ore with chloride/hypochlorite

    Leaching of an oxide gold ore with chloride/hypochlorite solutions Article in International Journal of Mineral Processing 82(4):178-186 · June 2007 with 2,959 Reads How we measure 'reads'

  • Conversion of chalcopyrite to copper oxide in hypochlorite

    Conversion of chalcopyrite to copper oxide in hypochlorite solution for selective leaching of copper in dilute was observed with the solution having pH 2.7−3.2. Enhanced copper leaching efficiency of up to 99.3% was achieved in the same (Hypochlorination-Sodium Hypochlorite) (Fifth edition), A John Wiley & Sons, Inc

  • Metallurgist & Mineral Processing Engineer

    2020-06-04· I read the two papers by the Tehran scientists and I am intrigued. If I understand it correctly, sodium chloride and calcium hypochlorite were each added to the leaching solutions at about 200 dm3. Initial pH was best at 11 and declined. The optimum pH to maintain HOCL in solution is 3.5-7.5. You stated the pH should be around neutral 6-7.

  • Chloride–hypochlorite leaching of gold from a

    An alternative non-cyanide lixiviant, namely sodium hypochlorite, has been used for the selective extraction of gold and silver from a copper concentrate. Hypochlorite leaching of the as-received

  • Leaching of chalcopyrite with sodium hypochlorite

    Chalcopyrite is the most important copper mineral source and also a refractory mineral for leaching. Several processing routes have been proposed to overcome the environmental problems related to copper extraction from chalcopyrite. In this study, the leaching of chalcopyrite has been investigated with a new reagent sodium hypochlorite (NaOCl).

  • Conversion of chalcopyrite to copper oxide in hypochlorite

    In the first-stage leaching, the initial pH varied from 12.5 to 13.7, the temperature from 35°C to 75°C, the sodium hypochlorite concentration from 0.2 to 0.85 molar, and the chalcopyrite dosage

  • Metallurgist & Mineral Processing Engineer

    2020-06-04· I read the two papers by the Tehran scientists and I am intrigued. If I understand it correctly, sodium chloride and calcium hypochlorite were each added to the leaching solutions at about 200 dm3. Initial pH was best at 11 and declined. The optimum pH to maintain HOCL in solution is 3.5-7.5. You stated the pH should be around neutral 6-7.

  • Leaching of an oxide gold ore with

    Calcium 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.

  • How to Leach Gold Ore With Chlorination Sciencing

    Gold can be leached from stone through alkaline or acidic-based products, including halogens, such as chlorine, iodine and bromine. Halogens are reactive, non-metal elements with seven electrons in their outer shell which allow them

  • Molybdenum Removal From Copper Ore Concentrate by

    Molybdenum Removal From Copper Ore Concentrate by Sodium Hypochlorite Leaching Article in Mining Science and Technology (China) 21(1):61-64 · January 2011

  • How to Use Bleach on Gold Ore to Remove Gold

    Add the 35-percent hydrochloric acid to the sodium hypochlorite bleach into a flask or beaker, in a two-to-one ratio of acid to bleach. Ensure that the liquid mixture is at least six times the volume of the ore grains. Wear a face mask

  • Selective precious metals leaching from a chalcopyrite

    While the copper dissolution during aqueous pressure oxidation was negligible (0.004%), it was at around 1.0% during the subsequent NaOCl leaching. The concentration of the copper in the sodium hypochlorite leach liquor was of the order of 0.048 g/L.

  • Factors influencing the selective leaching of

    Sodium hypochlorite concen- trations were determined iodimetrically using the method described in ASTM D20 22-64 [10]. RESULTS (a) The leaching of copper sulphides In the presence of carbonate and hypochlorite, copper dissolved from all three sulphide minerals to yield 100--130 ppm of copper

  • Process development for recovery of copper and precious

    1. Waste Manag. 2013 Nov;33(11):2354-63. doi: 10.1016/j.wasman.2013.07.017. Epub 2013 Aug 5. Process development for recovery of copper and precious metals from waste printed circuit boards with emphasize on palladium and gold leaching and precipitation.

  • hypochlorite leaching of gold ore

    Leaching of an oxide gold ore with chloride hypochlorite . An oxide gold ore was subjected to chloride hypochlorite leaching at room temperature concentration, and HCl concentration on gold leaching performance were investigated kinetics, taking twice the time (46 h) to achieve maximum gold recovery of 58% compared to sodium hypochlorite

  • Silver & Gold Cyanide Leaching of Copper Ore

    2020-06-04· Weighings were made every hour. The rates of leaching thus determined were compared with those obtained in pure solutions of sodium cyanide. In addition to deter-mining the cyanide in the copper-bearing