Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore

The issue of poor aeration efficiency and low oxygen transfer in the heap leaching of gold has gained considerable attention. In this study, ozone ice was studied as an oxygen release reagent in the cyanide heap leaching of gold at a low temperature of approximately 5 °C, owing to its effective oxid...

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Autores principales:	Ziyuan Liu, Jue Kou, Yi Xing, Chunbao Sun, Peng Liu, Yuxin Zhang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ozone ice oxygen release cyanide leaching heap leaching QCM-D Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/30feb6978726474ca6e26265b9e207e5
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spelling	oai:doaj.org-article:30feb6978726474ca6e26265b9e207e52021-11-25T18:26:36ZOzone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore10.3390/min111112512075-163Xhttps://doaj.org/article/30feb6978726474ca6e26265b9e207e52021-11-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1251https://doaj.org/toc/2075-163XThe issue of poor aeration efficiency and low oxygen transfer in the heap leaching of gold has gained considerable attention. In this study, ozone ice was studied as an oxygen release reagent in the cyanide heap leaching of gold at a low temperature of approximately 5 °C, owing to its effective oxidation and clean and green properties. Quartz Crystal Microbalance with Dissipation (QCM-D) was used to monitor the effect of different ratios of cyanide and oxygen concentrations on the gold leaching rate. The results showed that the leaching rate doubled when the dissolved oxygen (DO) was increased from 8.2 mg/L to 12 mg/L at a relatively high cyanide concentration of 60 mg/L. The release of oxygen during the process of ozone ice melting was analyzed by simulating the oxygen-deficient condition of the ore heap in column leaching. In the first stage of ice melting, the DO in the solution increased dramatically, and the rate of increase improved with increased initial ozone concentration in the ice. In the second stage of ice melting, the rate of increase in the DO of the solution was not significantly affected by the initial ozone concentration in the ice; this was consistent with the decomposition rate of ozone. The addition of ozone ice containing 300 mg/L ozone increased the gold extraction by 4.1% in the ore column leaching experiment, compared to a column with no ozone ice. However, continuously increasing the ozone concentration up to 600 mg/L had no further significant effect, because the dissolved oxygen in the leaching solution reached saturation. The results facilitate a better understanding of the decomposition law of ozone in the melting process of ozone ice and help to improve the oxygen deficit state in gold leaching heaps.Ziyuan LiuJue KouYi XingChunbao SunPeng LiuYuxin ZhangMDPI AGarticleozone iceoxygen releasecyanide leachingheap leachingQCM-DMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1251, p 1251 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ozone ice oxygen release cyanide leaching heap leaching QCM-D Mineralogy QE351-399.2
spellingShingle	ozone ice oxygen release cyanide leaching heap leaching QCM-D Mineralogy QE351-399.2 Ziyuan Liu Jue Kou Yi Xing Chunbao Sun Peng Liu Yuxin Zhang Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore
description	The issue of poor aeration efficiency and low oxygen transfer in the heap leaching of gold has gained considerable attention. In this study, ozone ice was studied as an oxygen release reagent in the cyanide heap leaching of gold at a low temperature of approximately 5 °C, owing to its effective oxidation and clean and green properties. Quartz Crystal Microbalance with Dissipation (QCM-D) was used to monitor the effect of different ratios of cyanide and oxygen concentrations on the gold leaching rate. The results showed that the leaching rate doubled when the dissolved oxygen (DO) was increased from 8.2 mg/L to 12 mg/L at a relatively high cyanide concentration of 60 mg/L. The release of oxygen during the process of ozone ice melting was analyzed by simulating the oxygen-deficient condition of the ore heap in column leaching. In the first stage of ice melting, the DO in the solution increased dramatically, and the rate of increase improved with increased initial ozone concentration in the ice. In the second stage of ice melting, the rate of increase in the DO of the solution was not significantly affected by the initial ozone concentration in the ice; this was consistent with the decomposition rate of ozone. The addition of ozone ice containing 300 mg/L ozone increased the gold extraction by 4.1% in the ore column leaching experiment, compared to a column with no ozone ice. However, continuously increasing the ozone concentration up to 600 mg/L had no further significant effect, because the dissolved oxygen in the leaching solution reached saturation. The results facilitate a better understanding of the decomposition law of ozone in the melting process of ozone ice and help to improve the oxygen deficit state in gold leaching heaps.
format	article
author	Ziyuan Liu Jue Kou Yi Xing Chunbao Sun Peng Liu Yuxin Zhang
author_facet	Ziyuan Liu Jue Kou Yi Xing Chunbao Sun Peng Liu Yuxin Zhang
author_sort	Ziyuan Liu
title	Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore
title_short	Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore
title_full	Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore
title_fullStr	Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore
title_full_unstemmed	Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore
title_sort	ozone ice as an oxygen release reagent for heap leaching of gold ore
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/30feb6978726474ca6e26265b9e207e5
work_keys_str_mv	AT ziyuanliu ozoneiceasanoxygenreleasereagentforheapleachingofgoldore AT juekou ozoneiceasanoxygenreleasereagentforheapleachingofgoldore AT yixing ozoneiceasanoxygenreleasereagentforheapleachingofgoldore AT chunbaosun ozoneiceasanoxygenreleasereagentforheapleachingofgoldore AT pengliu ozoneiceasanoxygenreleasereagentforheapleachingofgoldore AT yuxinzhang ozoneiceasanoxygenreleasereagentforheapleachingofgoldore
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Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore

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