Abstract
This study utilized an untreated bauxite tailing (BT) slurry to synthesize geopolymers to reduce material drying and calcination costs and achieve resource utilization of the BT slurry. The effects of BT content, liquid-to-solid (L/S) ratio, sodium silicate modulus, and concentration on compressive strength were analyzed, along with the geopolymer's resistance to water-induced erosion and its ability to immobilize Pb2+ and Cu2+. The results demonstrated that increasing BT content resulted in a decrease in compressive strength, but the complete substitution of fly ash (FA) with BT slurry resulted in a 28 d compressive strength of 4.89 MPa. Although BT slurry-based geopolymers (BTGs) had good resistance to water-induced in stability because of their dense structure, the addition of heavy metals weakened their mechanical strength. Leaching tests showed that the BTGs had an immobilization efficiency of greater than 96.5% for Pb2+ and between 93% and 96% for Cu2+ in landfill leachate, and all immobilization efficiencies for heavy metals in acid rain leachate exceeded 99.9%. The outcomes of characterization studies revealed that Pb2+ and Cu2+ engaged in geopolymerization and immobilized through the chemical bonding of T (Si, Al) − O − M (Pb, Cu) and physical sealing. This study presents a low-energy-consumption technology that effectively enhances the utilization of BT slurry. In situ material extraction can be used to remediate contaminated soils in tailing pond areas.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.