Leaching of a polymetal gold ore and reducing cyanide consumption using cyanide-glycine solutions

Barani, Kianoush; Dehghani, Morteza; Azadi, Mohammad; Karrech, Ali

doi:10.1016/j.mineng.2021.106802

Cited by 19 publications

(11 citation statements)

References 33 publications

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“…Leaching of gold from pure gold and gold ores in solutions of amino acid and cyanide solutions containing amino acids has recently been investigated (Azadi et al, 2019;Barani et al, 2021;Eksteen, 2014;Eksteen et al, 2017;Eksteen andOraby, 2014, 2015;Oraby and Eksteen, 2014, 2015a, 2015b. Oraby and Eksteen (2014) investigated the selective leaching of copper from a gold-copper concentrate in glycine solutions.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that in the first stage, alkaline glycine solutions selectively dissolved copper, zinc, and lead over precious metals; in the second stage, gold and silver were recovered using glycine and small amounts of cyanide. Barani et al (2021) explored the leaching of a polymetal gold using cyanideglycine solutions. They found that at 75% of gold dissolved using 1500 mg/L cyanide (without glycine), 80% gold dissolution was achieved using 200 mg/L cyanide with 0.5 mg/L glycine, indicating a reduction in cyanide consumption of more than 80%.…”

Section: Introductionmentioning

confidence: 99%

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Leaching of gold ore using creatine monohydrate

Ganji,

Barani

2024

J. S. Afr. Inst. Min. Metall.

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Creatine was used as a lixiviant for gold dissolution from gold ore. The effects of creatine concentration, temperature, leach time, and pH were examined for their influence on extent of gold dissolution. The results show that at a temperature of 75°C and pH 11.5, gold dissolution increased from 51% to 88% on increasing creatine concentration from 25 to 50 g/t. Further increase in creatine concentration showed a negative effect on the gold dissolution. Gold dissolution increased from 47% to 87% by increasing the temperature from 25°C to 55°C, and from 61% to 89% by increasing pH from 10 to 11.5. Under the optimum conditions of solids' content of 30%, pH 11.5, creatine concentration of 100 g/t, temperature of 75°C, and hydrogen peroxide addition of 2%, about 90% of the gold could be dissolved from the ore after 24 h. A comparison between creatine and cyanide leaching showed that 90% gold dissolution was achieved at a cyanide concentration of 300 g/t, which is three times higher than the creatine concentration under optimal conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Leaching of gold ore using creatine monohydrate

Ganji,

Barani

2024

J. S. Afr. Inst. Min. Metall.

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“…Additionally, minerals such as copper, lead, zinc, and iron minerals are recognized as consumers of alkaline cyanide in conjunction with gold ores [10].…”

Section: Introductionmentioning

confidence: 99%

“…Despite the advantages and disadvantages of each lixiviant, their application in the industry has been limited by environmental, technical, and economic factors, except for cyanide which has been widely used for decades. However, the toxic nature of cyanide and its associated environmental concerns have prompted the search for alternative methods [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Iron Oxide Gold-bearing Ore Processing Based on Ore Characterization: Gravity Pre-concentration and Cyanide Dissolution

Roostaei,

Kordparijaei,

Mesroghli

2023

Preprint

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The application of ore characterization and mineralogy holds a significant role in the development of a mineral processing route. The current investigation endeavors to evaluate the processing of iron oxide gold-bearing minerals exhibiting a gold grade of 1.07 g/ton. First, the mineralogical and microscopic characteristics of the ore sample were scrutinized. Subsequently, the recovery of gold from the ore was analyzed through gravity concentration and cyanidation techniques, following the characterization of minerals and ore using diverse methodologies. The outcomes revealed that the sample comprised free gold and oxidized structures, predominantly in the size fraction of -149 + 88 microns, and smaller within the range of 5–10 microns. Pre-concentration of gold-bearing minerals was performed via gravity separation techniques, including a shaking table and Knelson separator. The results indicated that the recovery of gold through these methods was limited, likely due to insufficient quantities of free gold present in the coarse-grained fractions. Subsequent cyanidation studies were conducted at pH 10.5, utilizing sodium cyanide concentrations of 3000 mg/l, and varying temperature, solid percentage, and size distribution parameters. The highest gold recovery rate of 95.03% was achieved in the size distribution of d80 = 53 microns, at a temperature of 80° C and a solid percentage of 25%. If a detailed technical and economic evaluation is conducted to optimize energy consumption and reduce grinding costs in the industry, it may be feasible to use the size distribution of d80 = 147 microns as the appropriate particle size for the cyanidation process, where a gold recovery rate of 90.51% was achieved at ambient temperature with a solid percentage of 30%.

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“…Gold plays an important role in the world economy, and its production and reserves are some of the important indicators used to measure a country's financial status [1]. With the continuous development of gold mineral resources, the need for efficient, sustainable, and environmentally friendly means for processing refractory gold resources is posing a major technical challenge to gold-producing companies around the world [2,3]. Shaanxi Province is one of the main gold-producing areas in China, relying on carbon-bearing deposits, which are mainly distributed in the Qinba area.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Roasting of Fine-Grained Carbonaceous Gold Ore: The Effect of Aeration Rate

Xiao

Jin

et al. 2021

Minerals

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The oxidation roasting of carbon-bearing micro-fine gold can eliminate or weaken the robbing effect of carbonaceous materials and clay, and destroy the encapsulation of micro-fine gold. The micropores produced by gas escaping during the roasting process are conducive to the diffusion of leaching agents, thus enhancing the cyanide leaching of gold. In this paper, the influence of the aeration rate during roasting on the leaching rate of fine-grained carbonaceous gold ore and its mechanism were studied using thermodynamic calculations, crystal structure analysis, surface chemical groups and bonds analysis, microporous structure analysis, and surface morphology detection. Under suitable roasting conditions, the carbonaceous and pyrite in the ore are oxidized, while carbonate minerals such as dolomite and calcite as well as clay minerals are decomposed, and the gold-robbing materials lose their activity. The experimental results have theoretical and practical significance for the popularization and application of oxidation roasting technology of fine carbon-bearing gold ore.

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Leaching of a polymetal gold ore and reducing cyanide consumption using cyanide-glycine solutions

Cited by 19 publications

References 33 publications

Leaching of gold ore using creatine monohydrate

Leaching of gold ore using creatine monohydrate

Iron Oxide Gold-bearing Ore Processing Based on Ore Characterization: Gravity Pre-concentration and Cyanide Dissolution

Oxidation Roasting of Fine-Grained Carbonaceous Gold Ore: The Effect of Aeration Rate

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