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Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process

[Image: see text] Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurem...

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Autores principales: Li, Hui, Li, Zhihang, Jin, Jianping, Han, Yuexin, Li, Yanjun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8811762/
https://www.ncbi.nlm.nih.gov/pubmed/35128269
http://dx.doi.org/10.1021/acsomega.1c06248
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author Li, Hui
Li, Zhihang
Jin, Jianping
Han, Yuexin
Li, Yanjun
author_facet Li, Hui
Li, Zhihang
Jin, Jianping
Han, Yuexin
Li, Yanjun
author_sort Li, Hui
collection PubMed
description [Image: see text] Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction are used to explore the structural evolution of pores on the surface and its effect on the leaching performance. Pores with optimal sizes were obtained by roasting at 650 °C for 2.0 h with a ventilation of 0.6 m(3)/h; approximately 92.55% gold could be recovered under these conditions. A porous structure observed by SEM became more compact as the temperature further increased to 850 °C. The formation of CaSiO(3) and CaSO(4) in pores led to pore shrinkage. The mechanism of oxidation roasting, followed by cyanide leaching, was schematically analyzed and revealed the effects of pore structural evolution and phase transformation on the leaching efficiency.
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spelling pubmed-88117622022-02-04 Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process Li, Hui Li, Zhihang Jin, Jianping Han, Yuexin Li, Yanjun ACS Omega [Image: see text] Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction are used to explore the structural evolution of pores on the surface and its effect on the leaching performance. Pores with optimal sizes were obtained by roasting at 650 °C for 2.0 h with a ventilation of 0.6 m(3)/h; approximately 92.55% gold could be recovered under these conditions. A porous structure observed by SEM became more compact as the temperature further increased to 850 °C. The formation of CaSiO(3) and CaSO(4) in pores led to pore shrinkage. The mechanism of oxidation roasting, followed by cyanide leaching, was schematically analyzed and revealed the effects of pore structural evolution and phase transformation on the leaching efficiency. American Chemical Society 2022-01-20 /pmc/articles/PMC8811762/ /pubmed/35128269 http://dx.doi.org/10.1021/acsomega.1c06248 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Li, Hui
Li, Zhihang
Jin, Jianping
Han, Yuexin
Li, Yanjun
Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process
title Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process
title_full Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process
title_fullStr Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process
title_full_unstemmed Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process
title_short Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process
title_sort pore evolution in refractory gold ore formed by oxidation roasting and the effect on the cyanide leaching process
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8811762/
https://www.ncbi.nlm.nih.gov/pubmed/35128269
http://dx.doi.org/10.1021/acsomega.1c06248
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