Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid
The processing of refractory gold-containing concentrates by hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of...
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ftdoajarticles:oai:doaj.org/article:f6545f39a2b047af99c41d8dc3c391ca 2023-05-15T18:45:06+02:00 Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid Denis A. Rogozhnikov Andrei A. Shoppert Oleg A. Dizer Kirill A. Karimov Rostislav E. Rusalev 2019-04-01T00:00:00Z https://doi.org/10.3390/met9040465 https://doaj.org/article/f6545f39a2b047af99c41d8dc3c391ca EN eng MDPI AG https://www.mdpi.com/2075-4701/9/4/465 https://doaj.org/toc/2075-4701 2075-4701 doi:10.3390/met9040465 https://doaj.org/article/f6545f39a2b047af99c41d8dc3c391ca Metals, Vol 9, Iss 4, p 465 (2019) refractory gold concentrate resources depletion reducing harmful emissions arsenic nitric acid kinetics shrinking core model pyrite arsenopyrite Mining engineering. Metallurgy TN1-997 article 2019 ftdoajarticles https://doi.org/10.3390/met9040465 2022-12-31T01:17:16Z The processing of refractory gold-containing concentrates by hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in the ores. This paper describes the investigation of the kinetics of HNO 3 leaching of sulfide gold-containing concentrates of the Yenisei ridge (Yakutia, Russia). The effect of temperature (70–85 °C), the initial concentration of HNO 3 (10–40%) and the content of sulfur in the concentrate (8.22–22.44%) on the iron recovery into the solution was studied. It has been shown that increasing the content of S in the concentrate from 8.22 to 22.44% leads to an average of 45% increase in the iron recovery across the entire range temperatures and concentrations of HNO 3 per one hour of leaching. The leaching kinetics of the studied types of concentrates correlates well with the new shrinking core model, which indicates that the reaction is regulated by interfacial diffusion and diffusion through the product layer. Elemental S is found on the surface of the solid leach residue, as confirmed by XRD and SEM/EDS analysis. The apparent activation energy is 60.276 kJ/mol. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X ) + [(1 − X ) −1/3 − 1] = 87.811(HNO 3 ) 0.837 (S) 2.948 e −60276/ RT · t . Article in Journal/Newspaper Yakutia Directory of Open Access Journals: DOAJ Articles Metals 9 4 465 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
refractory gold concentrate resources depletion reducing harmful emissions arsenic nitric acid kinetics shrinking core model pyrite arsenopyrite Mining engineering. Metallurgy TN1-997 |
spellingShingle |
refractory gold concentrate resources depletion reducing harmful emissions arsenic nitric acid kinetics shrinking core model pyrite arsenopyrite Mining engineering. Metallurgy TN1-997 Denis A. Rogozhnikov Andrei A. Shoppert Oleg A. Dizer Kirill A. Karimov Rostislav E. Rusalev Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid |
topic_facet |
refractory gold concentrate resources depletion reducing harmful emissions arsenic nitric acid kinetics shrinking core model pyrite arsenopyrite Mining engineering. Metallurgy TN1-997 |
description |
The processing of refractory gold-containing concentrates by hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in the ores. This paper describes the investigation of the kinetics of HNO 3 leaching of sulfide gold-containing concentrates of the Yenisei ridge (Yakutia, Russia). The effect of temperature (70–85 °C), the initial concentration of HNO 3 (10–40%) and the content of sulfur in the concentrate (8.22–22.44%) on the iron recovery into the solution was studied. It has been shown that increasing the content of S in the concentrate from 8.22 to 22.44% leads to an average of 45% increase in the iron recovery across the entire range temperatures and concentrations of HNO 3 per one hour of leaching. The leaching kinetics of the studied types of concentrates correlates well with the new shrinking core model, which indicates that the reaction is regulated by interfacial diffusion and diffusion through the product layer. Elemental S is found on the surface of the solid leach residue, as confirmed by XRD and SEM/EDS analysis. The apparent activation energy is 60.276 kJ/mol. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X ) + [(1 − X ) −1/3 − 1] = 87.811(HNO 3 ) 0.837 (S) 2.948 e −60276/ RT · t . |
format |
Article in Journal/Newspaper |
author |
Denis A. Rogozhnikov Andrei A. Shoppert Oleg A. Dizer Kirill A. Karimov Rostislav E. Rusalev |
author_facet |
Denis A. Rogozhnikov Andrei A. Shoppert Oleg A. Dizer Kirill A. Karimov Rostislav E. Rusalev |
author_sort |
Denis A. Rogozhnikov |
title |
Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid |
title_short |
Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid |
title_full |
Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid |
title_fullStr |
Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid |
title_full_unstemmed |
Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid |
title_sort |
leaching kinetics of sulfides from refractory gold concentrates by nitric acid |
publisher |
MDPI AG |
publishDate |
2019 |
url |
https://doi.org/10.3390/met9040465 https://doaj.org/article/f6545f39a2b047af99c41d8dc3c391ca |
genre |
Yakutia |
genre_facet |
Yakutia |
op_source |
Metals, Vol 9, Iss 4, p 465 (2019) |
op_relation |
https://www.mdpi.com/2075-4701/9/4/465 https://doaj.org/toc/2075-4701 2075-4701 doi:10.3390/met9040465 https://doaj.org/article/f6545f39a2b047af99c41d8dc3c391ca |
op_doi |
https://doi.org/10.3390/met9040465 |
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Metals |
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9 |
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4 |
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465 |
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1766236070264963072 |