gold leaching refractory

gold leaching refractory

Gold Leaching from a Refractory Gold Concentrate by the ...

In this research, NaCl — NaClO solution is used to leaching gold from a refractory gold concentrate, and the influence of NaCl and NaClO concentration, reaction time to the leaching rate were investigated in this experiment. The raw materials and the leaching residue were characterized by a series of analysis methods such as XRD, XRF, SEM and ...

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Improving the gold leaching process of refractory ores ...

2019-4-1 · To improve the leaching kinetics of refractory ores and gold recovery, a number of pre-treatment techniques are employed prior to cyanidation. These include roasting, biological and pressure oxidation and Albion and Leachox processes. Roasting is the first process employed to increase the leachability of refractory gold ores.

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(PDF) Leaching of a Refractory Gold Ore Sample from the ...

leaching of a refractory gold ore sample from the central zone, clarence stream property F IG 11 - EDS spectra of a rim phase on an aurostibite grain,

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How to Improve the Refractory Gold Leaching Process? -

2020-8-18 · The gold leaching rate of most refractory gold ores is about 10% ~ 20% when they are directly stirred by sodium cyanide. Generally, the gold leaching rate of refractory gold ore can be greatly improved by pretreating the raw materials, including oxidative roasting, hot-pressure oxidation, biological oxidation.

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Refractory concentrate gold leaching: Cyanide vs. bromine ...

1990-3-1 · Gold extraction, recovery and economics for two refractory concentrates were investigated using cyanide and bromine reagents. Gold extractions for cyanide leaching (24–48 hours) and bromine leaching (six hours) were the same and ranged from 94 to 96%. Gold recoveries from bromine pregnant solutions using carbon adsorption, ion exchange, solvent

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Refractory Gold Ore Treatment Methods

2016-7-14 · Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from

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(PDF) APPLICATION OF DIAGNOSTIC LEACHING

diagnostic leaching was performed on refractory gold ore containing 5.9% pyrrhotite, 0.9% pyrite, 1.3%. arsenopyrite and bulk concentrates generat ed

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Refractory Gold Technology

2020-1-20 · Refractory Gold Technology Sherritt’s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks. Many gold ores and concentrates contain fine grained gold locked within sulphide minerals, such as pyrite and/or arsenopyrite, unavailable for recovery by conventional leaching. In Sherritt’s gold

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Improvement of Gold Leaching from a Refractory Gold ...

2017-5-16 · The total gold leaching ratio of a refractory As-, S- and C-bearing gold concentrate calcine by direct cyanidation was only 70.2%, but there was a significant variation in the gold leaching ratio based on size fraction, in the

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Improvement of Gold Leaching from a Refractory Gold ...

A total gold extraction of 70.2% could only be reached via direct cyanidation from a refractory As-, S- and C-bearing gold concentrate calcine, and the gold extraction varied noticeably with different size fractions. The reasons for unsatisfactory gold extraction from the calcine were studied through analyses of chemical composition, chemical phase and SEM-EDS of different sizes of

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Improvement of Gold Leaching from a Refractory Gold ...

2017-7-31 · curing–water leaching 1. Introduction Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight ...

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How to Improve the Refractory Gold Leaching Process? -

2020-8-18 · The gold leaching rate of most refractory gold ores is about 10% ~ 20% when they are directly stirred by sodium cyanide. Generally, the gold leaching rate of refractory gold ore can be greatly improved by pretreating the raw materials, including oxidative roasting, hot-pressure oxidation, biological oxidation.

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Refractory Gold Ore Treatment Methods

2016-7-14 · Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore

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Recovery of gold from refractory gold ores: Effect of ...

2020-5-28 · The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide

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Refractory Gold Technology

2020-1-20 · Refractory Gold Technology Sherritt’s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks. Many gold ores and concentrates contain fine grained gold locked within sulphide minerals, such as pyrite and/or arsenopyrite, unavailable for recovery by conventional leaching. In Sherritt’s gold

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Guides - CNLITE Eco-friendly Gold Leaching Reagents,

2020-2-25 · Leaching Guide of Refractory Gold Ore. With the development of beneficiation technology, the definition of refractory gold ore is changing. Generally speaking, refractory gold ore in leaching field is a kind of ore whose leaching rate of gold is less than 80% when directly processed by cyanidation after find grinding.

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(PDF) Cyanidation of Refractory Gold Ores: A Review

2021-12-11 · In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were ...

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Scientists propose new ‘salty’ non-toxic gold extraction ...

2021-10-16 · The new process is based on the use of chloride, one of two elements in table salt, for the leaching and recovery of the yellow metal. “With our

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Improvement of Gold Leaching from a Refractory Gold ...

2017-5-16 · The total gold leaching ratio of a refractory As-, S- and C-bearing gold concentrate calcine by direct cyanidation was only 70.2%, but there was a significant variation in the gold leaching ratio based on size fraction, in the

Read More
Improvement of Gold Leaching from a Refractory Gold ...

2017-7-31 · curing–water leaching 1. Introduction Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight ...

Read More
How to Improve the Refractory Gold Leaching Process? -

2020-8-18 · The gold leaching rate of most refractory gold ores is about 10% ~ 20% when they are directly stirred by sodium cyanide. Generally, the gold leaching rate of refractory gold ore can be greatly improved by pretreating the raw materials, including oxidative roasting, hot-pressure oxidation, biological oxidation.

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Leaching refractory gold ores - Johannesburg

We claim: 1. A method of leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony and base metal cyanicides with a cyanide solution and with oxygen addition characterised by the steps of leaching the ore at a pressure of between 2 and 10 MPa and regulating the pH of the solution so that the terminal pH is alkaline and 10 or less

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Refractory Gold Technology

2020-1-20 · Refractory Gold Technology Sherritt’s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks. Many gold ores and concentrates contain fine grained gold locked within sulphide minerals, such as pyrite and/or arsenopyrite, unavailable for recovery by conventional leaching. In Sherritt’s gold

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING

2012-10-4 · 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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Types of refractory gold deposits - Fodamon Machinery

(2) Carbonaceous gold deposit. This kind of gold ore contains a certain amount of organic carbon and inorganic carbon. When extracting gold, in addition to the cyanidation process of gold into the solution, there is also the “gold robbing effect” caused by the adsorption of gold cyanide complexes in the solution by carbon substances, which makes the leached gold return to the

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Review Pretreatment Process on Refractory Gold Ores

appropriate gold leaching agent. The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. This

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HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES

2003-11-17 · Refractory gold ores Refractory ores are characterized by low recoveries and high reagent consumption when subjected to direct leaching and several attempts have been done to process efficiently those raw materials. In the last few years with the depletion of high grade and free-milling ores and with the development of economic and feasible pre-

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Establishing thE ProcEss MinEralogy of gold orEs

refractory gold can only be achieved by employing a pre-oxidation process prior to cyanide leaching. Antimony, bismuth sulfide and telluride gold ores: Antimony, bismuth sulfide and telluride gold ores are often somewhat refractory due to the presence of slow-dissolving gold minerals such as aurostibite, maldonite and gold tellurides ...

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