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pretreatment of refractory ores in gold leaching process congo

It's now over 10 years since the European Patent Office advised its decision to grant Maelgwyn Mineral Services Ltd (MMS) a European Patent for its Leachox process for the treatment of refractory gold ores. Since that time the process route has become the industry leader in the low-cost recovery of gold from refractory and sulphide orebodies.

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highly refractory ores, the processed gold ore should be pretreated before leaching. Without pretreatment process the gold recovery degree can remain under 50 % or for moderately refractory ores in the range of 50-80 %. In these cases, to increase the recovery degree to acceptable levels (over 80 %), pretreatment

Pretreatment Process on Refractory Gold Ores with As

It's now over 10 years since the European Patent Office advised its decision to grant Maelgwyn Mineral Services Ltd (MMS) a European Patent for its Leachox process for the treatment of refractory gold ores. Since that time the process route has become the industry leader in the low-cost recovery of gold from refractory and sulphide orebodies.

(PDF) Bacterial Leaching as a Pre

Biooxidation-heap concept for pretreatment of refractory gold ore. 2nd ed.In . Biophydrometallurgical Technologies. Torma. A.E., Wey. ... Bacterial oxidation technology — a viable process for refractory gold ores and base metal recovery. ... Microbial leaching of gold from ores and mineral wastes by means of heterotrophic bacteria. In .

Process for treating refractory gold ores by roasting ...

leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring 'preg robbing' carbonaceous materials or gold physically 'locked' in sulphide minerals. The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides.

Treatment of Refractory Gold Ores

submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite. Such ores require a pre-treatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen (Gudyanga et al., 1999). The gold in high-sulphur and high-arsenic refractory gold concentrate (HGC) is encapsulated

Process for treating refractory gold ores by roasting ...

dominance of the cyanide process for gold extraction over the past 100 years. the term "refractory" applied to a gold ore simply means that a high gold recovery is not attainable by cyanide leaching. There are various causes of refractoriness in gold ores, which include: inclusions of submicron gold

Gold Leaching from Refractory Ores—Literature Survey ...

Gold that is present as electrum causes a slower gold leach process in which cyanide consumption is increased. The cyanide consuming side reactions from oxides or sulphides drive excessive reagent consumption and thus higher production costs with a decrease in gold recovery. ... Figure 5 - Refractory Ore Pretreatment Options. In order to choose ...

Review Pretreatment Process on Refractory Gold Ores with As

Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

Pretreatment by electrolytic or oxidative leaching for ...

Ammonia and sodium chloride were used for alkaline oxidation pretreatment of refractory gold ore before cyanide leaching. Ca(OH) 2 was used as a pH modifier to maintain the pH at the targeted value during oxidation and leaching. Sodium cyanide was also applied as a leaching agent.

:: Maelgwyn Minerals' Leachox Refractory Gold Process hits ...

Bacterial Leaching as a Pre-treatment Step for Gold Recovery from Refractory Ores Article (PDF Available) in Physicochemical Problems of Mineral Processing 32:173-181 · March 1998 with 992 Reads

Characterization of refractory behaviour of complex gold ...

Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and …

Double

For a refractory ore, pretreatment is required in order to expose the gold surface to the leach solution.An acidic hypochlorite solution can be added to the autoclave for pressure oxidation and extraction of the gold at the same time.It required 50 sodium hypochlorite or 120 kgt available chlorine to extract 97 of the gold from the ore.

Developments in Gold Leaching: A Literature Survey ...

This paper evaluates the influence of some of the critical parameters of bottle roll testing procedure on gold extraction results and leaching behaviour. The conventional testing procedure with special emphasis to the testing duration, feed particle size, and NaCN concentration in the starting leach-solution, was assessed critically and compared with alternative approaches regarding these ...

Gold extraction

Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified, there are a number of alternatives for treating the ore. Firstly, the gold can be made more amenable to cyanidation by ultra-fine milling, followed by a hot atmospheric leach –the Albion Process.

Microbial Pretreatment of Refractory Gold Ore

The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb 9 Sb 22 S 42) and andorite (Sb 3 PbAgS 6).The ...

Application Note Refractory Gold Pretreatment

Apr 27, 2007· However, pretreatment processes involving thermal oxidation, such as roasting, chemical oxidation, such as acid leaching, acid or alkaline pressure leaching; or biological oxidation such as bioleaching with T. Ferrooxidans liberates gold from refractory minerals. Gold is then recovered from the oxidized mass by alkaline cyanidation.

Selective removal of antimony from refractory gold ores by ...

researched the direct thiosulfate leaching of gold from refractory ore, and they achieved gold recovery of only 70% (Shen et al., 2013). Li et al. studied the best conditions of roasting and oxidizing refractory gold-bearing sulfur concentrates in the muffle furnace, and the optimized technological

Optimizing the alkaline oxidation pretreatment of a ...

TEAGUE et al[22] studied diagnostic leaching of a refractory gold ore containing 5.9% pyrrhotite, 0.9% pyrite, 1.3% arsenopyrite and a bulk flotation concentrates. Based on the results of diagnostic leaching tests, CELEP et al[23] concluded that the refractoriness of a refractory gold ore was associated with the

Gold Leaching from Refractory Ores—Literature Survey ...

Jan 01, 2016· Gold in refractory sulfide ores occurs as fine inclusions or in solid solution typically within pyrite, marcasite, and arsenopyrite grains. In this type of ore, because the gold is encapsulated, the interaction with cyanide to form the soluble metal complex is inhibited (Marsden and House, 2006, La Brooy et al., 1994).