The optimal pressure oxidation pretreatment conditions were determined as follows: stirring speed 600 r/min, liquid-to-solid ratio of 4, pH 1.2–1.3, partial pressure of oxygen 1200 kPa, temperature 225 °C, and time 1.5 h. The extraction of gold increased from 9.7 to 82.1%.

In the state-of-art industry, refr actory gold ore is pre-treated prior to cyanidation to liberate the gold (La Brooy et al. 1994;Fraser et al. 1991). Known pretreatment methods are roasting (Hammerschmidt et al. 2016), pressure oxidation, (POX) (Mason et al. 1985; Thomas et al. 1990; Pangum and Browner

For gold recovery, a Chinese refractory, high-sulfur gold concentrate was subjected to biooxidation with high pulp density in a single stirred-tank reactor. The flotation concentrate contained 36.9 percent sulfur (S) and 33.9 percent iron (Fe). Different experimental regimes for biooxidation were applied. With a mixed culture and by …

With a mixed culture and by controlling the amount of addition of the gold ores and the pH of the biooxidation system, maximum iron oxidation of 82.6 percent and sulfur oxidation of 79.3 percent were achieved. The experimental results indicate that the pH control was beneficial to the biooxidation of this concentrate.

Pressure oxidation (POX) is an effective method for base metal extraction and a pretreatment of refractory gold ores. A residue from pressure leaching of …

The cyanidation gold recovery was as high as 94.71% after seven days of continuous bio‐oxidation, with the gold concentrate sulfur removal rates of 83.83%; similar results will be achieved after 13 days by batch bio‐oxidation.

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Most studies conducted have focused on the pulp density, Fe3+ concentration and sulfuric acid concentration, etc., of bio-oxidation, and few have reported on the influence of different bio-oxidation methods on kinetics. In this study, a comparative investigation on refractory gold concentrate by batch and continuous bio-oxidation was conducted, with the …

The pressure oxidation of 9.2% w / w "aged" nickel concentrate at 250 °C as a function of time, with 100 kPa O 2 overpressure and maximum oxygen flow rate of ~1.2 L/min., was investigated several years after the initial tests. These tests were conducted to examine the sulfide minerals transformations in greater detail and the impact of ...

The first pressure oxidation project of refractory gold ore in China Categories: Author: Origin: Time of issue: Views:13 / …

Kyuesi and Haque, etc. have studied the role of microwave in the gold extraction process of arsenic-bearing refractory gold ore. 8,9) Haque K E used microwave to dispose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%. 10) Liu Quanjun etc. made a test for a gold mine in Guizhou province. The ore without ...

Over the past 15 years, numerous pressure oxidation plants for pretreatment of gold ores and concentrates have been installed throughout the world. While this technology is now established, it suffers in terms of the complex engineering and operational ... See Full PDF Download PDF Related Papers 2000 • Matthew Jeffrey

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In this paper, a comprehensive gold deportment study, including mineralogical characterization, visible gold, and sub-microscopic gold analysis, was …

sure oxygen oxidation requires a maximum of 20% sulfide sulfur in concentrate. The first refractory gold concentrate pressure oxygen oxidation plant was not established in China until 2016 by Shuiyindong Gold Mine, a wholly subsidiary company of Zijin Mining Group Co., Ltd in Guizhou province.

Pressure oxidation (POX) is an effective method for base metal extraction and a pretreatment of refractory gold ores. A residue from pressure leaching of chalcopyrite concentrate was collected and investigated for gold recovery and deportment of metals.

Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is …

wave in the gold extraction process of arsenic-bearing refractory gold ore.8,9) Haque K E used microwave to dis-pose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%.10) Liu Quanjun etc. made a test for a gold mine in Guizhou province. The ore without micro-wave pretreatment could be hardly leached in cya ...

If the ore is refractory (not free-milling) and the capex of a pressure oxidation (POX) or (bio-oxidation) BIOX plant cannot be justified, a mine's only recourse may be the production of a concentrate. …

ABSTRACT Naturally, refractory gold is enclosed by sulfide minerals such as pyrite and arsenopyrite and a higher content of organic carbon, which results in difficulty in the recovery of gold. In this study, the flotation gold concentrate before and after pressure oxidation (POX) was analyzed.

Pilot plant pressure oxidation of refractory gold-silver concentrate from Eldorado Gold Corporation's Certej Project in Romania T. Chan Sherritt Technologies, Sherritt International Corporation, 8301-113 Street, Fort Saskatchewan, AB, T8L 4K7, Canada

Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold …

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 …

Pressure Oxidation of a Refractory Sulfide Concentrate and Thiourea Leaching of Gold and Silver from the Residues Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade. In sulfide ores, pyrite is the most common host mineral for gold.

(FeAsS)2 + 2Ca (OH) + 130 = 2FeSO4 + 2HCaAsO3 + H2O This reaction is a strong deoxidizer, inimical to gold solution by cyanide; therefore minimum amounts of lime and cyanide should, be employed in order to delay such reaction provided the gold is substantially free.

The raw materials in this experiment are taken from the Carlin-type gold concentrate produced by a gold smelting company in Guizhou. The gold concentrate was dried at 110 °C, then subjected to grinding it and pass the 150-mesh screening. The main chemical composition of the gold concentrate is shown in Table 1.

Li et al. studied the best conditions of roasting and oxidizing refractory gold-bearing sulfur concentrates in the muffle furnace, and the optimized technological parameters for …

Abstract Microbial enhanced sulfide oxidation is one of the alternatives to roasting or pressure oxidation (POX). High grade whole ores or upgraded sulfide concentrates can be processed using...

La majorité des projets miniers pro-posés concerne l'extraction de minerais tels que: Cuivre, nickel, Cobalt, Or, Argent, Plomb, Zinc, Molybdène et Platine. Ce Guide traite des im-pacts environnementaux des grands projets mi-niers relatifs à ces minerais.