Properties and microstructure of lithium-slag-based geopolymer by one-part mixing method

Abstract

Lithium is an important yet scarce energy material with great significance to the national economy and defense industry. However, a large amount of lithium slag (LS) is discharged in the production process. This paper proposed a high-volume and efficient utilization method of LS to synthesize LS geopolymer cement through a one-part mixing method. The effects of LS on the workability and mechanical properties of the LS-based geopolymer were investigated. The hydration process, products, and microstructures of LS-based geopolymers were studied. The results showed that LS had a negative effect on the fluidity of the geopolymer, yet hydration heat of LS geopolymer was lowered. The optimal 28d compressive strength of geopolymer reached 32.5 MPa in case of 50% LS used, which could be used as low-quality construction material in the producing place of LS.