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Materials 2012, 5(9), 1708-1721; doi:10.3390/ma5091708
Article

Comparison of Copper Scavenging Capacity between Two Different Red Mud Types

1,3
, 1
 and 2,*
1 Centre for Ecological and Environmental Technologies, South China Agricultural University, Guangzhou 510642, China 2 Australian Centre for Sustainable Catchments, University of Southern Queensland, Toowoomba QLD 4350, Australia 3 Chinese Research Academy of Environmental Sciences, Beijing 100012, China
* Author to whom correspondence should be addressed.
Received: 27 July 2012 / Revised: 28 August 2012 / Accepted: 3 September 2012 / Published: 24 September 2012
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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.
Keywords: alumina; bauxite; red mud; calcite; alkaline; copper; boehmite; atacamite; metal immobilization alumina; bauxite; red mud; calcite; alkaline; copper; boehmite; atacamite; metal immobilization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Ma, Y.; Si, C.; Lin, C. Comparison of Copper Scavenging Capacity between Two Different Red Mud Types. Materials 2012, 5, 1708-1721.

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