Comparison of copper scavenging capacity between two different red mud types

Ma, Yingqun and Si, Chunhua and Lin, Chuxia (2012) Comparison of copper scavenging capacity between two different red mud types. Materials, 5. pp. 1708-1721.

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Abstract

A batch experiment was conducted to compare the Cu scavenging capacity between two different red mud types: the first one was a highly basic red mud derived from a combined sintering and Bayer process, and the second one was a seawater-neutralized red mud derived from the Bayer process. The first red mud contained substantial amounts of CaCO3, which, in combination with the high OH− activity, favored the immobilization of water-borne Cu through massive formation of atacamite. In comparison, the seawater-neutralized red mud had a lower pH and was dominated by boehmite, which was likely to play a significant role in Cu adsorption. Overall, it appears that Cu was more tightly retained by the CaCO3-dominated red mud than the boehmite-dominated red mud. It is concluded that the heterogeneity of red mud has marked influences on its capacity to immobilize water-borne Cu and maintain the long-term stability of the immobilized Cu species. The research findings obtained from this study have implications for the development of Cu immobilization technology by using appropriate waste materials generated from the aluminium industry.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Open access journal.
Depositing User: Dr Chuxia Lin
Faculty / Department / School: Current - USQ Other
Date Deposited: 06 Nov 2012 04:50
Last Modified: 18 Aug 2014 04:24
Uncontrolled Keywords: alumina; bauxite; red mud; calcite; alkaline; copper; boehmite; atacamite; metal immobilization
Fields of Research (FOR2008): 09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091499 Resources Engineering and Extractive Metallurgy not elsewhere classified
09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9699 Other Environment > 969999 Environment not elsewhere classified
Identification Number or DOI: doi: 10.3390/ma5091708
URI: http://eprints.usq.edu.au/id/eprint/22048

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