gold leaching with hypochlorite

  • Hypochlorite Leaching of Gold Ore

    2017-11-8 · 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.

  • Leaching of an oxide gold ore with chloride/hypochlorite ...

    2007-6-1 · An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice ...

  • Leaching of an oxide gold ore with chloride/hypochlorite ...

    kinetics, 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 recovery.

  • Leaching of an oxide gold ore with chloride/hypochlorite ...

    An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl)2 vs. NaOCl, OCl− concentration, and HCl concentration on ...

  • Advances in Gold and Silver Processing

    2016-8-3 · 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.

  • Leaching of an oxide gold ore with chloride/hypochlorite ...

    Abstract An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl)2 vs. NaOCl, OCl− concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl+ complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking ...

  • (PDF) Chloride-hypochlorite oxidation and leaching of ...

    Direct hypochlorite leaching yielded gold and silver recoveries of 42.7% and 45.0%, respectively. With aqueous pressure oxidation followed by hypochlorite leaching, it

  • CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING

    2012-10-4 · Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig. 1. The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig. 2.

  • Dissolution of Silver and Gold with Sodium Hypochlorite ...

    2020-4-15 · Two-stage leaching was carried out: first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4) 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 98.73% and 83% of Ag and Au ...

  • 次氯酸钠浸金电化学及难浸金矿浸出实验研究 - j ...

    2017-12-29 · Electrochemical 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.