refractory ore peroxide oxidation


Atmospheric alkaline pre-oxidation of refractory sulphide ...

Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test. Three ...

ALTA Gold 2012 E-Doc - Home | Albion Process

oxidation, bio oxidation and roasting, for specific ores bodies (1-4). More recent technologies such as the Albion Process can be potentially comparable or lower cost compared with the conventional technologies (5). The most significant item affecting the economics is the amenability of the ore to

Peroxides Metals and Mining Solutions - Solvay

By destroying certain components of the ore that consume cyanide, pre-oxidation of the ore with Hydrogen Peroxide INTEROXⓇ Standard Grade also reduces the consumption of cyanide. The presence of sulphide minerals in the cyanidation of gold ores can cause significant consumption of oxygen supplied in the injected air.

Refractory Gold Ore Treatment Methods

The oxidation may also open up the fissure planes, setting free the associated gold. This oxidation may be secured by "weathering" the ore pulp, but in some cases, the agitation of the wet pulp with small amounts of lime and sodium peroxide, together with injected air prior to …

Refractory Gold Ore | Scientific.Net

The preoxidation of refractory gold ore by a mixed culture of moderately thermophilic bacteria also was investigated in this equipment. The results showed that, under the conditions of pulp density 8% and stay time 60h, it can deal with 0.256 kg refractory gold ore per day, and the arsenic leaching rate can reach to …

Recovery of gold and silver from complex refractory ...

Nov 16, 1993· A method of recovering precious metals from a silver bearing ore containing polybasite, pearcite, pyrargyrite, tetrahedrite or argentite by mixing the ore with an alkali metal or alkaline earth metal peroxide in slurry or solid, leaching the ore with a cyanide solution, and recovering the precious metals from the cyanide solution.

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields higher gold extractions from ores or concentrates and enables better handling of environmentally sensitive impurities. Normally, gold is extracted from neutralized autoclave leach residue by cyanidation.

Electrolysis with diamond anodes: Eventually, there are ...

This means that the hydroxyl and sulfate radicals mediated oxidation and the direct electrolysis are inefficient for breaking the C-S, C-F and S-N bounds of the NTf 2-anion, which is a very interesting mechanistic information to understand the complex processes undergone in electrolysis with diamond.

Processing Refractory Gold - Hydrometallurgy: Leaching in ...

May be increasing gold recovery from refractory gold ore (with grade 2-3 g/t) to 90-95%?Actual data of top refractory gold ore mines show, that gold recovery is 70% and less. What is reason? It is a problem in minerals processing or it is a global science problem? So if you work with refractory ore,

WO1998019779A1 - Improved leaching of mineral ores ...

A process for oxidation of ferrous ions in solution, and more particularly a process for improved base metal and/or uranium leaching from ores, concentrates or tailings using ferric ion as an oxidising agent. A reaction vessel (10) holds a ferrous ion-containing solution, for example, a copper sulphide leach slurry or concentrate. An agitator (12) may be provided to promote leaching of the ...

Bacterial Oxidation of Refractory Ores

The bacterial oxidation (BIOX) process for the pre-treatment of refractory ores for gold recovery was developed by the Genmin Process Research laboratory. Early work started in the late 1950's when the bacteria strain, "Thiobacillus ferrooxidans" was isolated from effluents pumped from the West Rand Consolidated underground mine but at ...

Treatment of carbonaceous refractory gold ores - ScienceDirect

Refractory ore treatment by this method normally gives gold extraction in excess of 95%. Autoclave leaching of refractory gold ores on an industrial scale started in the 1980's because of the high gold price and because pressure oxidation is an environmentally accepted alternative to roasting.

pretreatment of refractory ores prior to gold leaching ...

Pretreatment of a refractory arsenopyritic gold ore using . An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. • After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. • Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and

Gold extraction - Wikipedia

Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of ...

Improved recovery of a low-grade refractory gold ore using ...

Bacterial oxidation technology can be applied to refractory sulfide ores and concentrates to break down the mineral matrix and release the precious and base metals . During bio-oxidation refractory gold ores processes, mineral decomposition is believed to be mostly due to chemical attack by ferric iron, with the main role of the microorganisms ...

(PDF) Cyanidation of Refractory Gold Ores: A Review

The degree of refractoriness has been classified based on the proportion of gold recovered (Table 1) (Marsden and House, 2009 The gold in refractory sulfide gold ores is surrounded by sulfide ...

Optimizing the alkaline oxidation pretreatment of a ...

Optimizing the alkaline oxidation pretreatment of a refractory gold ore using taguchi orthogonal array method To cite this article: Foad Mahmoodi and Asghar Azizi 2018 Mater. Res. Express 5 126516 View the article online for updates and enhancements. Recent citations Synergistic effect of reduction leaching of manganese anode slime and oxidation

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE …

Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the autoclave, acid containing iron compounds can be formed.

The reasons of gold refractory, Gold ore classification ...

III. Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do'Rob gold'in gold and silver ore, and it causes that gold is adsorbed in the cyanide ...

REFRACTORY GOLD - PanTerra Gold Limited

OXIDATION PROCESS. Relative to other available refractory gold processing technologies, the Albion Process will be more profitable for: Highly refractory gold mineralisation – including double refractory ores, i.e. gold associated with both sulphide and carbonaceous mineralogy.

US5262136A - Recovery of gold and silver from complex ...

A method of recovering precious metals from a silver bearing ore containing polybasite, pearcite, pyrargyrite, tetrahedrite or argentite by mixing the ore with an alkali metal or alkaline earth metal peroxide in slurry or solid, leaching the ore with a cyanide solution, and recovering the precious metals from the cyanide solution.

Recovery Refractory Resources - SGS

options for refractory gold ores: roasting; pressure oxidation; bio-oxidation; and ultra-fine grinding. In roasting, pressure oxidation and bio-oxidation, the iron sulphide minerals are oxidised to create sulphur dioxide (SO 2) gas in the case of roasting, or sulphate ions in pressure oxidation and bio-oxidation. The iron component is

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

The influence of pyrite pre-oxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been ...

Advanced Oxidation Processes - Spartan Water Treatment

Advanced oxidation processes (AOP) combine ozone (O3), ultraviolet, hydrogen peroxide and/or catalyst to offer a powerful water treatment solution for the reduction (removal) of residual organic compounds as measured by COD, BOD or TOC. All AOP are designed to produce hydroxyl radicals.

Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite …

their possible applications to treat refractory gold ores (5). These processes can be classified as pressure oxidation (6), biological oxidation (7), and chemical oxidation (8).

WO1990013676A1 - Recovery of gold and silver from complex ...

The recovery of noble metals by sodium cyanide leaching from complex refractory gold and silver bearing ores containing such complex silver sulphides as polybasite, pearcite, pyrargyrite, tetrahedrite and argentite presents difficulties in that the precious metal is trapped inside the refractory matrix of the mineral. Pretreatments such as roasting, acid pressure leaching and biological ...

Treating Gout With Pegloticase, a PEGylated Urate Oxidase ...

A high plasma urate concentration (PUA), related to loss of urate oxidase in evolution, is postulated to protect humans from oxidative injury. This hypothesis has broad clinical relevance, but support rests largely on in vitro data and epidemiologic associations. Pegloticase therapy generates H(2)O( …

Optimizing the alkaline oxidation pretreatment of a ...

In addition, temperature demonstrated a significant effect on gold recovery percentage and improved the kinetics of oxidation of gold refractory ore. As observed from figure 3(d), the Au recovery increases from 86.71% to 96.72% by increasing temperature from 25 °C to 50 °C, and then remains unchanged with a further increase.