Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Carbonaceous gold ores are difficult to treat because of the “preg-robbing” by carbonaceous matters and locking by minerals. Roasting is the most commonly used method that is useful in dealing with carbonaceous gold ores. In this study, flotation gold concentrates containing sulfides and carbonaceou...

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Autores principales:	Xinwei Zhang, Yonghui Song, Ning Yin, Xinzhe Lan, Jianping Jin
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/4cfccdebbee54e519d5925b0d8306532
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spelling	oai:doaj.org-article:4cfccdebbee54e519d5925b0d83065322021-11-29T00:57:12ZStudy on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology2090-907110.1155/2021/6848020https://doaj.org/article/4cfccdebbee54e519d5925b0d83065322021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/6848020https://doaj.org/toc/2090-9071Carbonaceous gold ores are difficult to treat because of the “preg-robbing” by carbonaceous matters and locking by minerals. Roasting is the most commonly used method that is useful in dealing with carbonaceous gold ores. In this study, flotation gold concentrates containing sulfides and carbonaceous matters were investigated to ascertain the reaction process and the matters’ transformation characteristics in different temperatures by vacuum roasting pretreatment. Calcine and volatile condensates were characterized with several techniques. In the process of vacuum roasting, the main chemical reactions were decomposition reaction and carbothermic reduction reactions of sulfide ores, carbothermic reduction reactions of SiO2, and thermal decomposition reactions of organic carbon. The bad effects of “preg-robbing” by carbonaceous matters were greatly weakened by the thermal decomposition and carbothermal reduction. The gold locking minerals were mainly removed by reduction reactions. The sulfides were removed in ways that did not produce SO2. The removal of sulfur and carbonaceous matters during the vacuum roasting process was 95.83% and 65.38%, respectively. Direct cyanidation of the calcine extracted from 2.13% to 88.37% of the gold content with a vacuum degree of 10 Pa and roasting from 25°C to 1,200°C for 30 min.Xinwei ZhangYonghui SongNing YinXinzhe LanJianping JinHindawi LimitedarticleChemistryQD1-999ENJournal of Chemistry, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chemistry QD1-999
spellingShingle	Chemistry QD1-999 Xinwei Zhang Yonghui Song Ning Yin Xinzhe Lan Jianping Jin Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology
description	Carbonaceous gold ores are difficult to treat because of the “preg-robbing” by carbonaceous matters and locking by minerals. Roasting is the most commonly used method that is useful in dealing with carbonaceous gold ores. In this study, flotation gold concentrates containing sulfides and carbonaceous matters were investigated to ascertain the reaction process and the matters’ transformation characteristics in different temperatures by vacuum roasting pretreatment. Calcine and volatile condensates were characterized with several techniques. In the process of vacuum roasting, the main chemical reactions were decomposition reaction and carbothermic reduction reactions of sulfide ores, carbothermic reduction reactions of SiO2, and thermal decomposition reactions of organic carbon. The bad effects of “preg-robbing” by carbonaceous matters were greatly weakened by the thermal decomposition and carbothermal reduction. The gold locking minerals were mainly removed by reduction reactions. The sulfides were removed in ways that did not produce SO2. The removal of sulfur and carbonaceous matters during the vacuum roasting process was 95.83% and 65.38%, respectively. Direct cyanidation of the calcine extracted from 2.13% to 88.37% of the gold content with a vacuum degree of 10 Pa and roasting from 25°C to 1,200°C for 30 min.
format	article
author	Xinwei Zhang Yonghui Song Ning Yin Xinzhe Lan Jianping Jin
author_facet	Xinwei Zhang Yonghui Song Ning Yin Xinzhe Lan Jianping Jin
author_sort	Xinwei Zhang
title	Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology
title_short	Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology
title_full	Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology
title_fullStr	Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology
title_full_unstemmed	Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology
title_sort	study on vacuum roasting pretreatment of carbonaceous gold concentrates based on nonoxidation technology
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/4cfccdebbee54e519d5925b0d8306532
work_keys_str_mv	AT xinweizhang studyonvacuumroastingpretreatmentofcarbonaceousgoldconcentratesbasedonnonoxidationtechnology AT yonghuisong studyonvacuumroastingpretreatmentofcarbonaceousgoldconcentratesbasedonnonoxidationtechnology AT ningyin studyonvacuumroastingpretreatmentofcarbonaceousgoldconcentratesbasedonnonoxidationtechnology AT xinzhelan studyonvacuumroastingpretreatmentofcarbonaceousgoldconcentratesbasedonnonoxidationtechnology AT jianpingjin studyonvacuumroastingpretreatmentofcarbonaceousgoldconcentratesbasedonnonoxidationtechnology
_version_	1718407641626050560

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

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