optimum cyanide concentration for high sulphide ore gold

optimum cyanide concentration for high sulphide ore gold

The application of activated carbon for the adsorption and

similar to that used for gold extraction in a typical CIP process, and focuses on both the adsorption and elution stages. The carrier phase extraction of precious metals using activated carbon offers significant advantages over other processes in terms of simplicity, the high pre concentration

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THE ADSORPTION AND ELUTION OF PLATINUM GROUP

Platinum and palladium elute from activated carbon almost to completion in 4 to 5 bed volumes at 80176;C, while the elution of gold at this temperature is slow, with a significant amount of gold still to be eluted after 16 bed volumes. Cyanide pre treatment was found to have a significant influence on PGM elution.

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Refining gold sulphide ore concentrate Gold Refining

Feb 15, 20080183;32;I have several pounds of gold ore concentrate, the high sulphide type. I've read the thread from Paige, and would like a little more information. The fire assay on the concentrate is 3,079 oz/ton gold and 1,025 oz/ton of silver.

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A Study of the Effect of Djurliete, Bornite and

are among the most common copper sulphide minerals associated to gold ores, are investigated. 2. Experimental Section 2.1. Material A synthetic gold ore was produced by mixing gold grains at a concentration of 10g/t (38 micron) with 200 grams of quartz fines (P 99 of 7074 micron) and about 0.3% weight of copper as one of the

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Tungsten and Gold Scheelite Bearing Ores Alaska DGGS

The sulfide float upgraded the gold from 119 to 2,720 tr oz/st with a re covery of 97 pct. Tungsten was recovered from the sulfide flotation tailings by a fatty acid float using copper sulfate as a pro moter, lime as a modifier, sodium silicate as a dispersant, and 5 pct oleic acid in ethanol as a collector.

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Process Parameters for Bio oxidation of Sulphur in the Pre

bacterial oxidation of sulphur. So this problem of sulphur consuming cyanide could possibly be overcome by controlling the pH at 2.6 and temperature at 50oC in the final stage of bacterial leaching gold plant using NaOH or some other neutralizing agent depending on the cost, which happens to enhance the kinetics of bacterial oxidation of sulphur.

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The effects of dissolved oxygen and cyanide dosage on gold

The effects of dissolved oxygen and cyanide dosage on gold extraction from a pyrrhotite rich ore Article in Hydrometallurgy 72(1 2)39 50 183; February 2004 with 1,012 Reads DOI 10.1016/S0304 386X

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Sulphide Gold Ore Treatment by Leaching and Flotation Process

Problem with gold recovery from sulphide ore How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return. This latter point is most important. In many cases a gold mill using an all cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an

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Effect of the composition of some sulphide DeepDyve

The two gold ores studied had very different compositions. The low sulphide ore had a low sulphide content (1.36% S), present as pyrrhotite while the second had a very high sulphide content (20.2% S), in the form of pyrite, pyrrhotite and chalcopyrite. The efficiency of the process conditions was peculiar to the ores.

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Treatment of A Copper Rich Gold Ore by Cyanide Leaching

Abstract The treatment of a copper sulphide bearing gold ore by direct cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching was investigated. Dissolution behaviour of gold and copper in these leaching systems was demonstrated. Severe interference by the copper containing sulphides with cyanide leaching of gold is observed at

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Rcovery of gold in pyritic ores mine engineer

Recovery of gold in sulfide ores has fallen into several categories. First is froth flotation, and second is cyanidation of the ores. Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery.

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The Metallurgy of Cyanide Gold Leaching An Introduction

Oct 20, 20140183;32;Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates. Despite the difficulties and hazards of working with cyanide, no other process has yet been proven to be an economic viable alternative.

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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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Basic Iron Sulphate in Pressure Oxidation Processing

discoveries are in sulphide ore bodies that yield poor to modest gold recovery by the traditional whole ore cyanide leaching process. The gold in these deposits is inevitably encapsulated as . sub micron sized particles within an impervious sulphide mineral matrix, and is termed refractory. The most common refractory gold sulphide hosts are

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Gold extraction

If the gold can not be concentrated for smelting, then it is leached by an aqueous solution . The cyanide process is the industry standard.; Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg robbing the absorption by carbonaceous components which preferentially absorbs gold and gold cyanide complexes.

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The gold fills cracks and spaces in the quartz as the

Treatment of copper rich gold ore by cyanide leaching, ammonia , copper sulfide bearing gold concentration ,Abstract The treatment of a copper sulphide bearing gold ore by direct cyanide , Increasing the concentration of NH3 improves the selectivity and extent of gold.Patent WO2012053915A1 A process of gold and copper recovery ,Apr 26, 2012 , 1) A process for gold

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HEAP LEACHING OF Mindoro

Consequently, a programme of testwork was completed to determine the optimum conditions for agitation leaching under carbon in pulp (CIL) conditions. This included an assessment of the amount of gold that could be recovered by gravity concentration, and comminution testwork to establish the basic design parameters for

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Example Gold Ore YouTube

Oct 23, 20110183;32;Example Gold Ore Gold Mining with a mixture of sodium cyanide to extract metal ore fatherly. in the crystal lattice of certain sulfide ores. Gold contained in sulfide minerals present as

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(PDF) Cyanidation of a pyrrhotite bearing gold ore

Effect of lead nitrate addition on the leaching of a pyrrhotite bearing gold ore (Cyanidation pH 11.2, 380ppm NaCN, 8ppm O 2 , 32h) Figure 5 illustrates the reaction of cyanide with chalcopyrite

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optimum particle size for flotation of oxide gold ores

Jan 11, 20130183;32;Cyanide Leaching Of Gold Mine Engineer.Com provides mining, 50 100 soft oxide ores high at the optimum grind size for best gold P80 particle size. The flotation test is 187;More detailed. Concentration of gold, sulphide minerals and uranium oxide

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Effect of oxygen and lead nitrate on the cyanidation of a

Gold extraction of 96% can be obtained with cyanide consumption of 0.51 kglt and lime consumption of 0.60 kglt in 24 hours. A four hour pre leach followed by cyanidation is required (free cyanide concentration 480 ppm, pH 10.5, lead nitrate 200 golt and 16 ppm 02).

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Refractory Gold Mining SGS

Also, grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfides. SGS has very extensive experience with all the unit operations involved in the processing of refractory gold ores, and in selecting the optimum flowsheet for a particular ore. Our gold metallurgy expertise is second to none. Chemical interference

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Effect of High Concentration of Ammonia in Cyanide

Effect of High Concentration of Ammonia in Cyanide Leaching of a Copper Gold Ore approaches for the treatment of gold ores with high copper sulphide content. cyanide concentration of 0.032

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sulphide dust explosion dmp.wa.gov.au

1. Pyritic ores with sulphur content greater than 18% can support a dust explosion. 2. Ignition temperatures of pyritic ores vary between 320oC and 365oC. 3. Minimum oxygen concentration to support a dust explosion is 13%. 4. No significant difference has been observed in explosion parameters of pyritic and pyrrhotitic ore.

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Sulphide concentrate leaching

When zinc is present in the concentrate as a factor in cyanide consumption it can be removed from the solution with regeneration of the cyanide by means of sodium sulphide. This would be done, of course, after the precipitation of the silver as so to produce a zinc sulphide free from precious metal.

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Recovery of Gold and Silver and Removal of Copper, Zinc

The average gold and silver content in pregnant solution was 4.27 and 283 ppm respectively and the recoveries were 92% for gold and 95% for silver, with optimum operating parameters of pH 10, residence time of 20 minutes and addition of sodium chloride 4 of gr/L.

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Sulfide Ore Processing 171; TCB Metals and Refining

Processing Sulfide Ores Historically, miners have shipped their sulfide concentrates to overseas smelters that have little to no regulations or emissions controls. However, with the implementation of the Mercury Export Ban of 2008 and the high costs of installing equipment to prepare sulfide ores for cyanide leaching, many companies are

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optimum particle size for flotation of oxide gold ores

Jan 11, 20130183;32;Cyanide Leaching Of Gold Mine Engineer.Com provides mining, 50 100 soft oxide ores high at the optimum grind size for best gold P80 particle size. The flotation test is 187;More detailed. Concentration of gold, sulphide minerals and uranium oxide

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Aurorra Gold Mining Non Cyanide Leaching Blogger

But because of the small particle size of the gold CLS may be used in low enough concentration to make even this ore feasible. Cyanide is a very dilute solution and is used at concentration of less than 1%, and cannot be used in greater concentrations.

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A Novel Technique for Silver Extraction from Silver

concentration, the optimum pH can be calculated as 4.0. On the other hand, silver sulphide reacts with thiosulphate to give complexes Ag 2S+2SO 3 2 Ag(S O )3 2 =10 11 (at this temperature range) (11) assuming that 0.01 M of Ag 2S is converted into the complex where [SO 3 2] = 0.1 M and [S 2O 3 2]=0.8M. The calculated concentrations of H 2S and SO

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