The high level of sodium in red mud (RM) is one of the main issues hindering its incorporation as a raw material for construction and building materials. This paper presents a few studies on building materials developed using more than 70% w/w RM content. A proposed industrial process flowchart together with capital (CAPEX) and operational expenditure (OPEX) for a large-scale plant are presented here. It was estimated that the cost of processing 75 Mton of RM, over a period of 25 years, was US$ 17/ton, including CAPEX + OPEX. The products comprised pellets composed of RM and clay subjected to 1200 • C in a straightgrate kiln. The pellets can be used as road gravel, coarse aggregate in concrete, or converted into supplementary cement material for Portland cement. The collaboration of the construction and building material industry with the alumina industry will be beneficial to mitigate the environmental impacts of RM.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.