No.416 Jianye Road, South Jinqiao Area, Pudong, Shanghai, China
  • +86-21-58386256
  • No.416 Jianye Road, South Jinqiao Area, Pudong, Shanghai, China

leaching gold sulfides

Simultaneous sulfide oxidation and gold leaching of a ...

Combining sulfide oxidation and gold leaching using chloride/hypochlorite solution was used for a refractory sulfide concentrate containing 20.45 g/t gold. Leaching tests at different concentrations of Ca(OCl) 2 and NaCl, and also various initial pHs were performed.

Simultaneous sulfide oxidation and gold leaching of a ...

Highlights Sulfide oxidation and gold leaching used for a refractory sulfide concentrate. Leaching tests at different concentrations of Ca(OCl) 2 and NaCl were performed. Under optimum conditions recovery of gold after only 2 h was about 82%.

Alkaline Sulfide Gold Leaching Kinetics | Request PDF

Gold is mainly extracted from its ores or concentrates by leaching with oxygenated cyanide solutions [1,2]. Cyanide consumption during leaching, and the discharge of excess cyanide in wastewater ...

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF …

dize sulfides and leach gold simultaneously by this oxidant (Welham and Kelsall, 2000). Leaching of gold with hypochlorous acid follows reaction (1) (Jeffrey et al., 2001): +2Au + 3HOCl + 3H + 5Cl¯ 2[AuCl 4]¯ + 3H 2 O. (1) Controlling solution pH and Eh is important for stabilizing the gold complex. Fail-

Sulphide Gold Ore Treatment by Leaching and Flotation Process

Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return.This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an ...

Recovery of gold from sulfide refractory gold ore ...

The sulfides or oxides, which seriously affect the gold leaching process or encapsulate gold, are destroyed by alkali compounds (e.g. sodium hydroxide, sodium sulfide). It has advantages of high efficiency, not releasing harmful gases, flexible product solutions and low energy cost; Poor adaptability to oxide ores.

The effect of sulfide minerals on the leaching of gold in ...

Gold leaching kinetics were measured using a rotating electrochemical quartz crystal microbalance (REQCM), which measures the leaching rates in-situ. When the mineral is electrically in contact with gold, the gold dissolution rate increases as a result of the …

The effect of sulfide minerals on the leaching of gold in ...

The oxidation of gold and some sulfide minerals in solutions containing 5 mmol L − 1 cyanide and 50 mmol L − 1 sodium perchlorate as background electrolyte was studied using linear sweep voltammetry, and the polarization curves are shown in Fig. 1.It can be seen that gold oxidation commences at − 620 mV and approaches a diffusion limited current of 15 A m − 2 at 0 mV.

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

In addition to sulfides, carbonaceous material present in certain gold ores may also contribute to refractoriness. Gold associations with orpiment and realgar are rather rare. However, gold has been observed to be associated with these minerals that form inclusions in, or coatings around pyrite (Mason and Nanna, 1989).

(PDF) Alkaline Sulfide Gold Leaching Kinetics

Possible benefits of leaching gold with something other than cyanide include easier processing of refractory ore bodies including: carbonaceous, cyanicides, and sulfides, cheaper reagent and ...

The effect of sulfide minerals on the leaching of gold in ...

Gold leaching kinetics were measured using a rotating electrochemical quartz crystal ... that the leaching behavior of gold in the presence of sulfide minerals depended strongly on both the solubility of the sulfides and the oxygen concentration in the solution. For instance, in an oxygen-enriched cyanide solution, the ...

A fundamental study of the alkaline sulfide leaching of gold

Keywords: Hydrometallurgy; Leaching; Gold 1. INTRODUCTION Many gold ores are problematic as they contain metal sulfides, such as pyrite, arsenopyrite and chalcopyrite. These ores are often refractory, as the gold is encapsulated within the sulfide matrix. In order to recover the gold, the host matrix must be destroyed.