Archive Page


Peroxygen Chemicals for Metals and Mining Solutions | Solvay

Solvay's Hydrogen Peroxide INTEROXⓇ Standard Grade is used in gold and silver leaching processes to enhance overall leach recovery and optimise 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. This ...

Check price

DETOXIFICATION OF CYANIDE IN GOLD PROCESSING …

cyanide detoxification was achieved through the oxidation of cyanide by hydrogen peroxide using various hydrogen peroxide solutions at pH levels between 7-13 and temperatures between 12-65 °C using copper sulfate as a catalyst. The optimum pH and dose of hydrogen peroxide for complete cyanide removal in the

Check price

Non-toxic leaching formula developed for e-scrap - E-Scrap ...

Aug 11, 2016· A leaching method can effectively extract precious metals from e-scrap without using toxic chemicals, the product's creator said. British Columbia, Canada-based Mineworx said its HM X leach formula removes gold, palladium, platinum, silver and other metals from circuit boards and is safer than cyanide or other leaching formulas.

Check price

A Method for Leaching or Dissolving Gold from Ores or ...

leaching step to produce a gold-bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu-tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or …

Check price

Assisted leaching using peroxide | nowata

Assisted leaching using peroxide. Feb 18 2013. Comments Off. Gold dissolution using cyanide requires the presence of an oxidant and invariably the oxidant used is dissolved oxygen. In a typical CIL or CIP agitated leach operation the oxygen is provided by compressed air or oxygen addition. In heap leach operations the oxidant is usually the air ...

Check price

v118n12a4 Decomposition of hydrogen peroxide in alkaline ...

leaching by cyanide, its low aqueous solubility presents some drawbacks in practical application; hydrogen peroxide has therefore been considered as a possible alternative. The aim of this investigation was to study the catalytic decomposition of hydrogen peroxide, which generates an

Check price

Developments in gold leaching using hydrogen peroxide

Introduction Hydrogen peroxide is known to the mining industry as a powerful oxidant. able to attack and to destroy cyanide, the most important leaching reagent (Knorre and Griffiths, 1984; Griffiths, 1988; Griffiths, 1988). [ ] The most recent development, however, is the use of H2O2 as an oxidant in the cyanidation of precious metals.

Check price

Hydrometallurgical recovery/recycling of platinum by the ...

Leaching in the presence of hydrogen peroxide. 3.4. Leaching in cyanide. 3.5. Leaching with iodide/iodine solution. 3.1. Leaching in aqua regia solutions. The leaching of a metal is mainly governed by the formation of a complex under the potential and pH of the solution in the presence of ionic species.

Check price

Cyanide Leaching Of Gold - Mine Engineer.Com

Cyanide Leaching Of Gold . Gold Cyanide Solution (Leaching Gold With Cyanide) Since the 1890's, cyanide has been used to recover gold from gold bearing ores. And today, over 115 years later, most of the worlds gold is recovered with cyanide playing a large part in the beneficiation of the yellow precious metal. Chemically, it is a rather simple ...

Check price

Recent Developments in the Photocatalytic Treatment of ...

processes is limited to extraction in the alkaline phase using cyanide because of its high selectivity with respect to gold [4–6]. Latin America and the developing countries exhibit one of the primary gold and silver exploitation scenarios based on the leaching of ores with solvents, such as sodium cyanide (NaCN)—The Merrill-Crowe Process.

Check price

Leaching of pyrite with hydrogen peroxide in sulphuric ...

The kinetics of leaching pyrite with hydrogen peroxide in sulphuric acid were investigated. The parameters studied were: stirring speed, temperature, particle size and concentrations of H 2 O 2 and H 2 SO 4.The effects of SO 4 2− and H + additions were also investigated. The leaching rate decreases with increasing stirring speed and H 2 SO 4 concentration. The kinetics of pyrite dissolution ...

Check price

AU614420B2 - Process for leaching noble metals using a ...

AU614420B2 - Process for leaching noble metals using a leaching solution containing cyanide, and hydrogen peroxide - Google Patents Process for leaching noble metals using a leaching solution containing cyanide, and hydrogen peroxide Download PDF Info Publication number AU614420B2 ...

Check price

Leaching and recovery of platinum group metals from UG …

Leaching and recovery of platinum group metals from UG-2 concentrates yields were not good (less than 40 per cent). Platinum leaching was particularly poor with cyanide (ambient temperature). A HCl/chlorine leach on untreated material had the same effect as a cyanide leach with a nitric acid pre-leach,

Check price

VERVIEW OF CYANIDE TREATMENT METHODS

The primary application of the hydrogen peroxide process is with solutions rather than slurries due to the high consumption of hydrogen peroxide in slurry applications. The process is typically applied to treat relatively low levels of cyanide to achieve cyanide levels that may be suitable for discharge. The hydrogen peroxide

Check price

Improvements in gold ore cyanidation by pre-oxidation with ...

Improvements in gold ore cyanidation by pre-oxidation with hydrogen peroxide. ... In addition, the presence of sulphides leads to extra consumption of the cyanide-leaching agent, NaCN, due to the formation of thiocyanate, therefore increasing costs. These types of gold sulphidic ores may be pre-treated prior to cyanidation by means of an ...

Check price

AU614420B2 - Process for leaching noble metals using a ...

AU614420B2 AU41193/89A AU4119389A AU614420B2 AU 614420 B2 AU614420 B2 AU 614420B2 AU 41193/89 A AU41193/89 A AU 41193/89A AU 4119389 A AU4119389 A AU 4119389A AU 614420 B2 AU614420 B2 AU 614420B2 Authority AU Australia Prior art keywords leaching solution process hydrogen peroxide ore Prior art date 1988-09-09 Legal status (The legal status is an assumption and …

Check price