Jan 01, 2015 The leaching of gold using alkaline amino acids–hydrogen peroxide solutions at low concentrations has been studied. The application of alkaline amino acid–hydrogen peroxide system may offer an alternative and environmentally benign process for gold leaching, particularly in the context of leaching low grade gold ores in an in-situ or in heap leach processes. read more
A process for the recovery of gold from a precious metal bearing sludge concentrate is disclosed. The process comprises the steps of leaching the sludge with hydrochloric acid and hydrogen peroxide to solubilize at least gold, palladium and platinum, removing silver from the leach slurry as insoluble silver chloride and selectively precipitating gold from the leach solution remaining after ... read more
A process for leaching gold and silver from ores and ore concentrates is disclosed using a cyanide leaching solution and hydrogen peroxide and maintaining an oxygen concentration of 2 to 20 Mg of O 2 /liter. In the invention, leaching takes place in the presence of decomposition catalysts and preferably the formed cyano-complexes are separated during leaching from the leach solution. read more
During leaching of gold from an oxides ore, only adding heavy metals, gold leaching rate increases apparently, when they are associated with hydrogen peroxide, gold leaching rate will further ... read more
Apr 01, 1999 Gold cyanidation, using hydrogen peroxide, was considered by Knorre et al. and Habashi to be a slow process in which hydrogen peroxide inhibits the reaction by oxidizing cyanide to cyanate. On the other hand, Day [6] found no direct relation between the behavior of the gold dissolution rate and cyanide or peroxide concentrations. read more
Aug 18, 2005 Moreover, a hot solution of hydrochloric acid mixed with a hydrogen peroxide (H^sub 2^O^sub 2^) also dissolves gold according to the chemical reaction (see Reaction 5). read more
Our Mining Solutions Gold and Silver Leaching. Solvay’s hydrogen peroxide INTEROX Ⓡ Standard Grade is used in gold and silver leaching processes to enhance overall leach recovery and optimize cyanide consumption. The use of Peroxide technology increases the rate of leaching through enhancing the delivery of oxidant in solution and through partial oxidation of associated minerals. read more
Apr 24, 2017 This was the first commercial method used for gold extraction. Place the ore into the mortar and grind it to the size of sand grains. Put the ore grains into a plastic bowl. 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 ... read more
Leaching - Gold and Silver Recovery. ... Hydrogen Peroxide as well as Caro’s Acid are feasible. Selection of the optimal treatment will depend on the solution/slurry characteristics to be treated, the feed and required discharge contaminant level as well as regional pricing for the necessary chemicals. read more
The reagents are hydrogen peroxide, H202, Caro’s acid, H2MS05, and calcium peroxide, CaO2. ... The gold leaching kinetics were found to be chemically controlled and the rate was found to ... read more
Decomposition of Cyanide from Gold Leaching Tailingsby Using Sodium Metabisulphite and Hydrogen Peroxide Dongzhuang Hou , 1 Lang Liu , 2 Qixing Yang , 2 Bo Zhang , 2 Huafu Qiu , 2 Shishan Ruan , 2 , 3 Yue Chen , 1 and Hefu Li 4 read more
Methods of increasing dissolved oxygen levels in leach slurries, for example, by using pure oxygen or hydrogen peroxide as an oxidant, may also need to be considered to maintain adequate gold dissolution rates. Hydrogen peroxide could also be used for low-pressure oxidation, but the economics are quite unfavorable for most ores, although one notable exception is Pine Creek (Australia), where hydrogen peroxide has been used during gold leaching, … read more
A process for leaching gold and silver from ores and ore concentrates is disclosed using a cyanide leaching solution and hydrogen peroxide and maintaining an oxygen concentration of … read more
Nov 11, 2020 An enhancement of the process of geomaterial heap leaching using hydrogen peroxide enables a higher concentration of oxygen in the lower parts of the pile, which results in an increase in gold recovery by 7.6 % (from 79.5 % to 87.1 %) in comparison with the conventional process. read more
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