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gold sulfide refractory

Methods of Processing of the GoldContaining Refractory ...

method for processing the refractory sulfide ore is the method of hydrochlorination along with thiocarbamide. As a method of processing the goldcontaining tailings of the refractory sulfide concentrates we chose the method of electrochemical oxidation of sulfides in the ore pulp with the use of various chlo

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Lowering the Threshold for Refractory Gold Deposits with N.

A hypothetical sulfide refractory gold deposit located in central Nevada was examined at two different processing rates. The sulfides were assumed to be pyritic and capable of forming a sulfide flotation concentrate representing 10% of the weight of the milled ore.

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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) Arsenicbearing 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.

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Review Pretreatment Process on Refractory Gold Ores with As

Pretreatment Process on Refractory Gold Ores with As Xinyuan NAN, Xin CAI* and Jun KONG School of Electrical Engineering, Xinjiang University, 1230 Yan’an Road, Tianshan District, Urumqi, 830047 P. R. China. (Received on August 30, 2013; accepted on October 17, 2013) The problem of the refractory nature of gold bearing arsenide ores is ...

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Recovery of Gold in Pyritic Sulfide Ores Mine

Recovery of Gold in Pyritic Sulfide Ores The now extinct Us Bureau of Mines conducted numerous studies of gold in pyrite, and sulfide ores over the years, until their untimely demise in the 1990's.

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

gold in iron sulfide minerals such as pyrite and arsenopy rite. Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. A clear boundary between refractory and nonrefractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold

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Gold extraction Wikipedia

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E. Litz and R. Wayne Carter 119th TMS Annual Meeting February 1822, 1990 ... these estimated costs and ore sulfide grades then are used to compare the process ... Refractory gold ores present a number of problems to the gold …

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roasting gold sulfides with lime

Acid pressure oxidation is generally believed to be the most effective pretreatment for refractory sulfide gold ores and concentrates, although it is ineffective for some ores. For such ores and concentrates (usually those containing both carbonaceous and sulfide materials), roasting remains the most effective pretreatment before cyanidation.

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Pressure Oxidation Process Outotec

Outotec can provide a complete pressure oxidation plant including all auxiliary processes for refractory gold sulfide oxidation. Gold is efficiently released from the sulfide matrix for the subsequent leaching process, whether cyanidation or chloride leaching.

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gold sulfide ore processing

Dec 02, 2018· Pretreatment of a refractory gold sulfide ore by means of SciELO. In the case of very lowgrade ores, biooxidation is an attractive alternative pretreatment to render the gold amenable to extraction. This process utilizes the. Contact Us.

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Process for treating refractory gold ores by roasting ...

T1 Process for treating refractory gold ores by roasting under oxidizing conditions. AU Fernández, R. R. AU Sohn, H. Y. AU LeVier, K. M. PY 2000. Y1 2000. N2 Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation.

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pretreatment of refractory sulphide gold ores and concentrates

Refractory sulfide gold ores are characterized by yield poor gold recovery in direct conventional cyanide leaching. That problem is an old and still existing problem until this time. The refractory sulfide gold ores in which gold is surrounded by sulfide minerals, oxidative pretreatment of the ore …

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high pressure oxidation of refractory gold minerals

Pretreatment of a refractory gold sulfide ore by means of SciELO. of pretreatment include oxidation by nitric acid, roasting or pressure oxidation. Biological oxidation (biooxidation) as pretreatment of refractory gold ores is based suggested high oxidation of the sulfides and high release of the gold trapped B. Mineral.

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Refractory Gold | Mining | SGS

The other parameter that SGS experts consider when designing refractory gold treatments is whether or not to preconcentrate the goldbearing ore. This is usually done by flotation of arsenopyrite, pyrite, or other goldbearing sulfides. To be economically justifiable, preconcentration should meet two objectives.

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Characterizing gold in refractory sulfide gold ores and ...

Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and arsenopyrite, where it occurs in both the chemically bonded state and as nanosize grains of metallic gold. During roasting or pressure oxidation, the sulfide matrix is destroyed and essentially all the gold is converted ...

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A FUNDAMENTAL INVESTIGATION OF THE HIGH …

Double refractory gold ore, meaning significant gold is locked in sulfides and being “pregrobbed” by carbonaceous material, presented a new challenge in which …

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

The majority of the refractory gold and silver occurs in occlusion in sulphides, then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochloritesodiumhydroxide solution followed of pressure cyanidation of the oxidized concentrate, for the extraction of precious metals. This process was conducted and evaluated under cyanide and oxygen ...

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Sulfide Leacing Of Gold

Effect of Pretreatment of Sulfide Refractory Concentrate . For extraction of gold from refractory ores or concentrate, in which gold is surrounded or covered by iron sulfide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold …

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Chloridehypochlorite oxidation and leaching of refractory ...

Chloridehypochlorite oxidation and leaching of refractory sulfide gold concentrate Article (PDF Available) in Physicochemical Problems of Mineral Processing 49(1):6170 …

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gold sulfide extraction

Pretreatment of a refractory gold sulfide ore by means of SciELO. Andacollo is a gold sulfide ore coming from Andacollo area in the northwest of This ore is partially refractory (about 50 % of the gold was extracted even. Contact Us. Methods of Processing of the GoldContaining Refractory Sulfide .

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Gold Process Mineralogy

Gold recovery from the carbonaceous sulfide ore is more difficult not only because the gold is finegrained and locked in sulfide minerals but also because the gold can be robbed from the cyanide solution by the carbonaceous At Barrick’s Goldstrike Mine, where gold occurs in pyrite in refractory sulfide ore and doublerefractory ...

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Treatment of carbonaceous refractory gold ores

Treatment of carbonaceous refractory gold ores Article in Minerals Engineering 4(7):10431055 · December 1991 with 1,203 Reads DOI: /08926875(91)900827

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gold sulfide ore oxidation

Oct 24, 2017· Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and During roasting or pressure oxidation, the sulfide matrix is destroyed and. Contact Us. Bacterial Oxidation of Refractory Sulfide Ores for Gold Recovery.

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Gold Mining Process Development – Denver Mineral Engineers

The common definition of “refractory” gold ores, are those ores that do not allow the recovery of gold by standard gravity concentration or direct cyanide leaching. One major category of refractory ores are gold values contained within the crystalline structure of sulfide minerals such as pyrite and arsenopyrite.

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Sulfides, Selenides and Tellurides: rebellious and ...

Many sulfide minerals also contain things like copper or antimony that can react with the cyanide, preventing the cyanide from leaching out the gold and silver. For information on methods to deal with and extract gold, silver and base metals from these refractory ores, I recommend two pages on this website.

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Fungal pretreatment of sulfides in refractory gold ores ...

Fungal pretreatment of sulfides in refractory gold ores. Author links open overlay panel G. OforiSarpong a K. OsseoAsare a b M. Tien c. Show more. ... These results suggest that P. chrysosporium is a potential microorganism for oxidative decomposition of metal sulfides associated with refractory gold …

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Sulphide Gold Ore Treatment by Leaching and Flotation Process

Sulphide Gold Ore Treatment by Leaching and Flotation Process ... Two examples are the large lowgrade ore bodies which require very fine grinding and refractory sulphides which have to be concentrated and roasted to expose gold to cyanide action. A Flowsheet to recovery gold from sulfide ores.

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Characterizing Gold in Refractory Sulfide Gold Ores and ...

Characterizing Gold in Refractory Sulfide Gold Ores and Residues Chen, Cabri, and Dutrizac Overview ... processing of refractory sulfide gold ores. Roasting is a viable alternative in such circumstances as roasting oxidizes the carbon and volatilizes much of the

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF …

Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig. 1. The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig. 2.

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Refractory gold BioMineWiki Skellefteå

The refractory nature of these ores can be attributed to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb the gold as is dissolves or encapsulate the gold particles thus preventing action of the leaching solution. See also . Auriferous Refractory Sulfide Ore

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HYDROMETALLURGICAL TECHNOLOGY FOR GOLD …

Based Processing methods of refractory sulfide goldbearing products with fine inclusions of gold are determined by many parameters, such as, for example, material composition, technological and mechanicalandphysical properties. At the moment, there are many technologies for gold stripping from sulfide goldbearing raw materials. These are

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Bacterial Oxidation of Refractory Sulfide Ores for Gold ...

Gold is finely disseminated in refractory sulfide ores, thereby decreasing Au recoveries upon conventional cyanidation for gold dissolution. In the bioleaching process, bacteria remove the sulfide minerals by oxidative dissolution and thus expose Au to extraction with cyanide solution. Stirred tank

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solution gold sulfide ore

Sulfides, Selenides and Tellurides rebellious and . Sulfides, Selenides and Tellurides Information on how to capture all the Gold from refractory gold ores By contrast, charges for processing free milling ore at ia City was only around 20.

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