Preparation and properties of lithium slag-based alkali-activated cementitious materials.

Purpose: To solve the problem of poor activity, large accumulation and low utilization rate of lithium slag,a technical study on the preparation of alkali-activated cementitious materials with lithium slag as the main raw material and mineral powder as silicon-aluminum corrective material was proposed. Method;The influence of various influencing factors on the compressive strength of cementitious materials was explored by orthogonal experiments to obtain the optimal raw material ratio; the optimal activation conditions of lithium slag were obtained by mechanical activation and thermal activation, and the microstructure of lithium slag-based cementitious materials was characterized by XRD and SKM. Result; The results show that when the lithium slag is mechanically activated for 60 min utes and thermally activated at 650 *C for 1 hour with a content of 60%,a water glass modulus of 1,a water glass content of 12%,a liquid-solid ratio of 0. 4,a curing temperature of 20 *C,and a stirring time of 10 minutes,the 28-day strength of the cementitious material can reach 45. 52 MPa;the main hydration products of the cementitious material are sodium zeolite,C-S-H gel,leucite,etc. The gel fills the pores,increases the density,and improves the performance of the cementitious material. Significance;It provides a new idea for the comprehensive utilization of lithium slag. [ABSTRACT FROM AUTHOR]