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gold ore lixiviant

Predicting Cyanide Consumption in Gold Leaching: A Kinetic ...

The consumption of cyanide during processing operations is a major economic cost in the extraction of gold from its ores, while the discharge of cyanide wastes may result in significant environmental pollution. Many factors influence the levels of consumption and discharge of cyanide, including ore mineralogy and lixiviant solution chemistry.

Gold CIL & CIP Gold Leaching Process Explained CCD

Metallurgical ContentLearn CyanidationDevelopments in the Carbon-In-Pulp ProcessDesign Criteria Commercial Operations Cyanide is a lixiviant, or reagent that is used to leach, often in tanks, gold from a solid matrix and form a gold cyanide complex. The gold cyanide complex is then extracted from the pulp or slurry by adsorption onto activated carbon.

Thiosulfate as an Alternative Lixiviant to Cyanide for ...

Request PDF on ResearchGate | Thiosulfate as an Alternative Lixiviant to Cyanide for Gold Ores | Thiosulfate is generally considered to be an attractive alternative reagent to cyanide for ...

Alternative lixiviants to cyanide for leaching gold ores ...

Request PDF on ResearchGate | Alternative lixiviants to cyanide for leaching gold ores | Over 25 alternative lixiviant processes to cyanide have been tested in the laboratory; some of which have ...

WO2013152424A1 - Chloride process for the leaching of gold ...

A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90°C and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent ...

Alternative lixiviants to cyanide for leaching gold ores ...

Alternative lixiviants to cyanide for leaching gold ores M.G. Aylmore Placer Dome Technical Services Ltd., 323 Alexander St., Vancouver, BC, Canada V6A 1C4 Over 25 alternative lixiviant processes to cyanide have been tested in the laboratory, some of which have been successful for niche applications.

Leaching Pyrite Gold Ore without Cyanide

Figure 9 shows the results for gold leaching at [SC(NH2)2]0 of 0.15 M (11.4 g/L) and [Fe+3]0 of 0.02 M (1.12 g/L) and pH 2. As with the thiocyanate lixiviant, gold dissolution of the ore without chemical pretreatment was very low, compared to the ore with pretreatment.

Chloride as an Alternative Lixiviant to Cyanide for Gold Ores

Aqua regia was discovered by the alchemists as a lixiviant for gold and is a mixture of hydrochloric and nitric acids. Chlorine was first used in recovery of gold from its ores in 1851 by Karl Friedrich Plattner, who used metallic iron to cement gold from the chloride leach solution (, 1881). The barrel chlorination process used chlorine ...

Gold extraction from paleochannel ores using an aerated ...

energy/matter exchanges. Karrech et al. (2018) modelled the lixiviant-gold-porous ore interaction during in situ recovery for an iodine-iodide system and the insights of that study is forseen to be applicable to glycine based ISR as well . Martens et al. (2 012) performed reactive transport evaluations

US5338338A - Method for recovering gold and other precious ...

A method for recovering precious metals from carbonaceous ore comprising leaching the ore with a lixiviant solution and then preg-robbingly concentrating the precious metal-lixiviant complexes in solution on to the native carbonaceous component of the ore for subsequent recovery. The preg-robbing capacity of the native carbonaceous component of the ore can be augmented by adding recycled ...

Heap Leaching - Metallurgist & Mineral Processing Engineer

Heap leaching of gold and silver ores is conducted at approximately 120 mines worldwide. Heap leaching is one of several alternative process methods for treating precious metal ores, and is selected primarily to take advantage of its low capital cost relative to other methods. Thirty-seven different heap leach operations with a total production of 198 tonnes of gold per year (6,150,000 ounces ...

Gold leaching in non-cyanide lixiviant ... - ScienceDirect

In contrast, the material used in test N11 (Navarro et al., 2002) was a sulphidic ore with much higher gold (95 g/t) and silver (235 g/t) grades. Fig. 13 compares the fraction of gold (X) leached from these two ore samples using the two lixiviant systems CuSO 4 /(NH 4) 2 S 2 O 3 /pH 10/25 °C and O 2 (100 psig)/Na 2 S 2 O 3 /pH 12/40 °C.

Cyanide and Other Lixiviant Leaching Systems for Gold with ...

Jul 18, 2013· Fast gold dissolution is possible but reagent consumptions are high. Thiourea is unusual in producing a cationic Au(I)complex, "Au(NH2CSNH2)2" and gold dissolution is slower. For treating simple auriferous oxide-silicate-carbonate ores, and many otfier materials, cyanide remains the preferred lixiviant.

US5169503A - Process for extracting metal values from ores ...

Metal values are solubilized from ore by a lixiviant having a pH from 5 to 8, comprising an aqueous solution of a chloride salt and a hypochlorite salt. Cyanuric acid may be added to retard decomposition of the lixiviant. In one alternative embodiment, any remaining hypochlorite ions are then eliminated by adding hydrogen peroxide or a reducing agent to the pregnant lixiviant.

Mercury control in the cyanidation of gold ores

MERCURY CONTROL IN THE CYANIDATION OF GOLD ORES J. D. Millerl, E. Alfarol, M. Misra2, ... which is a strong lixiviant for gold, is an equally strong lixiviant for mercury. According to Sharpe (1), simple and complex cyanides of mercury are ... It is evident that the problem of mercury in the cyanidation of gold and silver ores is a two fold ...

US4177068A - Extraction of gold and silver - Google Patents

A process for the extraction of gold and silver from their ores in which the ore is reduced to a particle size of 1 mm or less and mixed with a lixiviant, e.g., alkaline sodium or potassium cyanide, in an amount to provide a liquor content of about 8 to 12%, the lixiviant coated particles are allowed to react for a time sufficient for the lixiviant to extract the noble metal and the particles ...

Dual lixiviant leaching process for extraction and ...

Dual lixiviant leaching process for extraction and recovery of gold from ores at room temperature. ... A gold ore A with 18 g/t of Au and 1.15 wt.% of sulfur and another gold ore B with 55.7 g/t of Au and 11.67 wt.% of sulfur were used in this work. They were procured from the region of Inner Mongolia of China. ... After gold recovery by ...

Gold Extraction in Carbonaceous Ore using Thiosulfate

increasing gold extraction to allow for direct comparison with thiosulfate consumption. It is immediately apparent that under the proper conditions thiosulfate is a much better lixiviant for extracting gold from this carbonaceous ore than cyanide.

GLYCINE AS A LIXIVIANT FOR THE LEACHING OF LOW …

gold ores are an important source of both copper and gold as they are obtainable in huge ... lixiviant for low grade coppergold ores at alkaline pH. Although alkaline glycine solutions - have been reported to selectively leach copper over gold from a copper flotation

(PDF) Mathematical Modelling of Gold Ore Heap Leaching

Mathematical Modelling of Gold Ore Heap Leaching ... The scope of the present study is limited to the case where the rate-controlling reagent is a component of the lixiviant solution only and not ...

Gold Ore Processing | ScienceDirect

Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing operation. This completely updated edition ...

COMPARISON OF CYANIDE AND THIOSULPHATE …

2.2 Classification of Gold Ores Oraby (2009) classifies gold ores in seven categories as presented below: 1. Free milling ores: from which cyanidation can extract 95% of the gold when the ore is ground to a size of 80% under 75 μm. For example palaeoplacer and quartz vein gold are the two main classes of free milling ores. 2.

US4557759A - Iodine leach for the dissolution of gold ...

A process for the hydrometallurgical recovery of gold from materials containing gold comprising leaching the materials with a lixiviant containing iodine. To a solution concentrated with natural salts is added elemental iodine until saturated, whereupon mineral sulfides in the ore zone charged with this solution react with the iodine to form iodide.

Glycine as a lixiviant for the leaching of low grade ...

Glycine as a lixiviant for the leaching of low grade copper-gold ores. Tanda Bennson 2017.pdf (5.392Mb) Access Status. Open access. ... The continuous depletion of high grade gold ores has shifted research focus towards the processing of low grade, complex ores containing impurities such as copper which is detrimental to the traditional ...

Alternative lixiviants to cyanide for leaching gold ores

Despite the research interest and pilot plant trials on many of the noncyanide gold lixiviants, the majority are still at the development stage. The most advanced alternative lixiviant is thiosulfate leaching of carbonaceous preg-robbing ores, which has been largely developed by Newmont Mining, Placer Dome, and Barrick Gold.

Optimisation of the Leaching Parameters of a Gold Ore in ...

Run-of-mine low grade gold ore, also termed "sub-ore," was placed in valley-fill dump (heap) leaches and processed for gold values with a cyanide lixiviant. ... leaches and processed for gold ...

Gold Dissolution from Ore with Iodide-Oxidising Bacteria ...

Mar 12, 2019· Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly ...