Research on the performance of low carbon mine filling cementing material based on red mud: A comprehensive review
Wenhuan Liu, Zeyu Zhou, Hui Li, Tongsheng Zhang, Qulang Mai, Canhao Li
Abstract
Red mud (RM) is a solid byproduct produced during the refinement of alumina from bauxite ore. This paper offers a comprehensive examination of RM as a sustainable, low-carbon resource for cementitious mine filling, highlighting both its potential and associated challenges in the construction sector. RM, a highly alkaline residue of alumina extraction, poses considerable environmental hazards due to its complex mineral composition and heavy metal content. This review synthesizes advancements in RM modification techniques, including acid, heat, and alkali activation treatments, to enhance its viability as a construction material. Experimental results demonstrate that RM-based composites achieve up to 20 % higher compressive strength and 15 % greater durability compared to conventional materials. Through the study on the durability of red slime backfill in groundwater environment, the strength loss rate was the minimum when the red slime content was 40 %, and the strength loss rate was 23.41 % after 25 freeze-thaw cycles, indicating that the backfill had good environmental adaptability. Additionally, advanced microstructural analyses using X-ray diffraction (XRD) and scanning electron microscopy (SEM) reveal the formation of stable hydration products that reduce heavy metal leaching by 30 %. The synergistic blending of RM with industrial wastes like fly ash and gypsum significantly improves critical properties such as workability, setting time, and microstructural integrity. This review provides valuable insights into the practical application of RM in green mining, waste recycling, and sustainable construction practices, offering innovative pathways for the efficient and eco-friendly utilization of industrial byproducts.