Study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements

Alunite flotation concentrate extracted from copper tailings is considered to be a resource for recovery of potassium, aluminum and gallium, which mainly contains alunite, quartz, dickite and pyrite phases by the X-ray diffraction analysis. The calcination temperature and time affect not only the de...

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Autores principales:	Ling Liu, Yumei Wang, Chuchu Cai
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Alunite Copper tailings Thermal decomposition Mechanical activation Recovery Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/3cba7cf81e4c4015977b3bf5a2559f06
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spelling	oai:doaj.org-article:3cba7cf81e4c4015977b3bf5a2559f062021-12-01T05:07:07ZStudy on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements2772-397610.1016/j.clema.2021.100008https://doaj.org/article/3cba7cf81e4c4015977b3bf5a2559f062021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2772397621000083https://doaj.org/toc/2772-3976Alunite flotation concentrate extracted from copper tailings is considered to be a resource for recovery of potassium, aluminum and gallium, which mainly contains alunite, quartz, dickite and pyrite phases by the X-ray diffraction analysis. The calcination temperature and time affect not only the decomposition ratio of alunite but also the phase change of alumina. The effects of mechanical activation on thermal decomposition and leaching behavior of the alunite concentrate are investigated. The decomposition reactions of pyrite and alunite happen at 400–500 °C and 500–800 °C respectively, and the decomposition of alunite involves two stages, dehydration and desulphation. The mechanical activation produces some amorphisation and structural disordering, which is responsible for the decrease of apparent activation energy of dehydration as well as desulphation. The leaching ratio of potassium, aluminum and gallium increases with activation time.Ling LiuYumei WangChuchu CaiElsevierarticleAluniteCopper tailingsThermal decompositionMechanical activationRecoveryMaterials of engineering and construction. Mechanics of materialsTA401-492ENCleaner Materials, Vol 1, Iss , Pp 100008- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Alunite Copper tailings Thermal decomposition Mechanical activation Recovery Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Alunite Copper tailings Thermal decomposition Mechanical activation Recovery Materials of engineering and construction. Mechanics of materials TA401-492 Ling Liu Yumei Wang Chuchu Cai Study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements
description	Alunite flotation concentrate extracted from copper tailings is considered to be a resource for recovery of potassium, aluminum and gallium, which mainly contains alunite, quartz, dickite and pyrite phases by the X-ray diffraction analysis. The calcination temperature and time affect not only the decomposition ratio of alunite but also the phase change of alumina. The effects of mechanical activation on thermal decomposition and leaching behavior of the alunite concentrate are investigated. The decomposition reactions of pyrite and alunite happen at 400–500 °C and 500–800 °C respectively, and the decomposition of alunite involves two stages, dehydration and desulphation. The mechanical activation produces some amorphisation and structural disordering, which is responsible for the decrease of apparent activation energy of dehydration as well as desulphation. The leaching ratio of potassium, aluminum and gallium increases with activation time.
format	article
author	Ling Liu Yumei Wang Chuchu Cai
author_facet	Ling Liu Yumei Wang Chuchu Cai
author_sort	Ling Liu
title	Study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements
title_short	Study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements
title_full	Study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements
title_fullStr	Study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements
title_full_unstemmed	Study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements
title_sort	study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/3cba7cf81e4c4015977b3bf5a2559f06
work_keys_str_mv	AT lingliu studyondecompositionkineticsofactivatedaluniteconcentratefromcoppertailingsandleachingbehaviorofvaluableelements AT yumeiwang studyondecompositionkineticsofactivatedaluniteconcentratefromcoppertailingsandleachingbehaviorofvaluableelements AT chuchucai studyondecompositionkineticsofactivatedaluniteconcentratefromcoppertailingsandleachingbehaviorofvaluableelements
_version_	1718405535971147776

Study on decomposition kinetics of activated alunite concentrate from copper tailings and leaching behavior of valuable elements

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