A kinetic and electrochemical study of the ammonia cyanide process for leaching gold in solutions containing copper

Jeffrey, Matthew I; Linda, Linda; Breuer, P.L.; Chu, Chee Keng

doi:10.1016/s0892-6875(02)00265-0

Cited by 22 publications

(13 citation statements)

References 7 publications

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“…The presence of glycine may play a major role in the enhancement of gold dissolution as either a main lixiviant or as a complexing agent for Cu(II), which can act as an additional oxidant for gold dissolution. As found by Jeffrey et al (2002), the presence of Cu(II) increases the gold leach rate in the copper-cyanide-ammonia system in the absence of free cyanide. The slow rate of gold dissolution in a solution containing low cyanide concentration can be attributed to the fact that gold dissolution is diffusion limited by the cyanide concentration at these conditions.…”

Section: Kinetics Of Gold Dissolutionsupporting

confidence: 55%

“…Recently, the recovery and re-use of the copper-cyanide complexes from the final leaching solution streams have received some attention. Therefore, research investigations have been conducted to economically treat copper containing gold ores by either reducing the cyanide consumption using a cyanide-ammonia system in the leaching stage (Costello et al, 1992;Jeffrey et al, 2002;La Brooy et al, 1991;Muir et al, 1991Muir et al, , 1993, or by recovering copper and recycling the cyanide after leaching (Adams et al, 2008;Alonso-Gonzalez et al, 2009;Alonso-González et al, 2013;Gonen et al, 2004;Xie and Dreisinger, 2009a,b).…”

Section: Introductionmentioning

confidence: 99%

“…A fundamental study by Jeffrey et al (2002) has shown that the addition of ammonia to solutions containing cuprous cyanide species increases the dissolution of gold. The presence of copper(II) was also shown by the authors to increase the gold leach rate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gold leaching in cyanide-starved copper solutions in the presence of glycine

Oraby

Eksteen

2015

Hydrometallurgy

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Section: Kinetics Of Gold Dissolutionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

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Gold leaching in cyanide-starved copper solutions in the presence of glycine

Oraby

Eksteen

2015

Hydrometallurgy

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“…11), 구리 1 가이온과 암모니아농도의 증가도 금침출율을 감소시키 는 것으로 보고하였다. [49][50] Muir의 보고에 따른 전형적 인 침출조건은 3% Cu, 2.5 -5.0 kg/t NaCN, 1.1 kg/t NH 3 이며 이 조건에서 약 70-80%의 침출율을 나타내는 것으로 보고하였다.…”

Section: )unclassified

Development of Ammoniacal Leaching Processes; A Review

Yoo¹,

Kim²

2012

Journal of the Korean Institute of Resources Recycling

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Selective leaching processes for copper, gold, nickel, and cobalt have been investigated because there is an advantage of ammoniacal hydrometallurgy that metal such as copper could be selectively extracted restricting the dissolution of iron or calcium. In the present article, the studies for selective ammoniacal leaching of copper from motor scraps and waste printed circuit boards (PCBs), for ammoniacal leaching of gold to decrease the amount of cyanide used or to substitute cyanide by thiosulfate, and for ammoniacal leaching to recover nickel and cobalt from nickel oxide ore and intermidiate obtained from manganese nodule treatment process were summarized and further studies were proposed for domestic technology development for ammoniacal hydrometallurgy processes.

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“…Australian organizations invested considerable efforts in the development and application of the ammonia-cyanide leaching (Hunt process) for the extraction of gold from ores containing a high concentration of copper in the 1990s [1][2][3][4][5][6] and 2000s [7,8]. Early work on leaching of the Buzwagi copper-bearing ores demonstrated the potential of the Hunt process in terms of gold extraction, consumption of cyanide and copper dissolution [9].…”

Section: Introductionmentioning

confidence: 99%

A Study of the Effect of Djurliete, Bornite and Chalcopyrite during the Dissolution of Gold with a Solution of Ammonia-Cyanide

Deschênes¹,

Guo

Xia³

et al. 2012

Minerals

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Abstract:The high solubility of copper sulphide minerals is an issue in the cyanidation of gold ores. The objective of this study was to quantify the effect of individual copper sulphide minerals on the Hunt process, which showed advantages over cyanidation. High purity djurleite, bornite and chalcopyrite, with a P 70 of 70-74 microns, were mixed with fine quartz and gold powder (3-8 micron) to obtain a copper concentration of 0.3%. The ammonia-cyanide leaching of slurry with djurleite proved to be more effective than cyanidation; producing comparable extraction of gold (99%), while reducing the cyanide consumption from 5.8 to 1.2 kg/t NaCN. Lead nitrate improved the Hunt leaching. The lower cyanide consumption is associated to a significant reduction of copper dissolved. XPS surface analysis of djurleite showed that lead nitrate favored the formation of Cu(OH) 2 species. Lead was also detected on the surface (oxide or hydroxide). Sulphide and copper compounds (cyanide and sulphide) were reaction products responsible for inhibiting the dissolution of gold. Lead nitrate added in the Hunt leaching of bornite produced 99% gold extraction. Surface reaction products were similar to djurleite. The cyanide OPEN ACCESSMinerals 2012, 2 460 consumption (~4.4 kg/t NaCN) was not reduced by the addition of ammonia. Cyanidation of chalcopyrite showed a lower consumption of cyanide 0.33 kg/t NaCN compared to 0.21 kg/t NaCN for Hunt. No significant interferences were observed in gold leaching with a slurry containing chalcopyrite.

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A kinetic and electrochemical study of the ammonia cyanide process for leaching gold in solutions containing copper

Cited by 22 publications

References 7 publications

Gold leaching in cyanide-starved copper solutions in the presence of glycine

Gold leaching in cyanide-starved copper solutions in the presence of glycine

Development of Ammoniacal Leaching Processes; A Review

A Study of the Effect of Djurliete, Bornite and Chalcopyrite during the Dissolution of Gold with a Solution of Ammonia-Cyanide

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