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Open AccessArticle

Physical and Chemical Properties of Sintering Red Mud and Bayer Red Mud and the Implications for Beneficial Utilization

by Ping Wang 1,2 and Dong-Yan Liu 1,*
1
College of Civil Engineering, Chongqing University, Chongqing 400044, China
2
Department of Military Architecture and Civil Engineering, Logistical Engineering University of PLA, Chongqing, 401331, China
*
Author to whom correspondence should be addressed.
Materials 2012, 5(10), 1800-1810; https://doi.org/10.3390/ma5101800
Received: 9 July 2012 / Revised: 30 July 2012 / Accepted: 21 September 2012 / Published: 9 October 2012
Performances of two common types of red mud, Bayer red mud and Sintering red mud, were investigated in this research. Their compositions, mechanical properties and microstructure characterization were measured through XRD, TG and SEM analysis. Their shear strength, particle size, density and hydraulic characteristics also had been performed. Huge differences between the basic mineral types of these two kinds of red mud also can be found. The comparison of compositions shows that CaCO3 content in Sintering red mud is higher, Bayer red mud has more hazardous elements such as As, Pb and Hg and both have a high concentration of radioactivity. The micro particle of Bayer red mud is finer and more disperse, but the Sintering red mud has higher shear strength. Combining the TG and hydraulic characteristics analysis, it can be shown that Bayer red mud has higher value of water content and Sintering red mud has higher hydraulic conductivity. The paper then illustrates that Sintering red mud can become the main filling material of supporting structure of red mud stocking yard. Bayer red mud has a high reuse value and also can be used as a mixing material of masonry mortar. View Full-Text
Keywords: red mud; composition; radioactivity; hydraulic conductivity; application red mud; composition; radioactivity; hydraulic conductivity; application
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Wang, P.; Liu, D.-Y. Physical and Chemical Properties of Sintering Red Mud and Bayer Red Mud and the Implications for Beneficial Utilization. Materials 2012, 5, 1800-1810.

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