wastewater [20]. Red mud has the pr

wastewater [20]. Red mud has the properties of porous materials andhas the advantages of having a large specific surface area, large activity,strong adsorption capacity, moderate price, easy preparation and con-sumption of a large amount of solid waste [21]. Therefore, red mud canbe used as a matrix material to prepare paraffin phase change materials.In this paper, a paraffin/red mud phase change energy storagecomposite was prepared by a mixed mill-heating method. Then, SEMand FT-IR were used to characterize the microstructure and chemicalcompatibility of the raw red mud material and the paraffin/red mudphase change energy storage composites. The specific surface area wasstudied by N2adsorption-desorption Brunauer Emmett Teller (BET)isotherms. The particle size distribution was characterized by a laserparticle size analyser. The chemical composition and phase of the rawmaterials and phase change energy storage composites were char-acterized by XRF, LRS and XRD. The thermal reliability and durabilityof the paraffin/red mud phase change energy storage composites weremeasured by differential scanning calorimetry (DSC) and thermo-gravimetry (TG) analyses. Finally, the phase change energy storagematerials were added to gypsum and cement paste at mass fractions of10%, 20% and 30% to measure the thermal conductivity and me-chanical properties.