Physicochemical Principles of CO 2 Sequestration in Building Materials Based on Nepheline Slime

Abstract

The results of theoretical and experimental studies to determine the possibility of sequestration of carbon dioxide in building materials based on nepheline slime are presented. The main principles of the technology for the utilization of CO 2 in the building materials and products industry are presented, in particular, on the basis of nepheline slimes produced during the production of alumina from nepheline ores. Using the method of thermal analysis, the efficiency of carbonization of prototypes in a medium of increased concentration of carbon dioxide was proved. Optimization of technological parameters for the production of carbonized samples based on nepheline slime was carried out using the methods of optimal experiment planning. The equations of regression of strength, density, water resistance and water absorption of prototypes are obtained depending on the main technological factors. Optimal technological parameters for the production of a carbonized material with the necessary properties were established. The physicomechanical characteristics of the prototypes hardened in a medium with a high concentration of carbon dioxide are determined. A forecast is made regarding the possibility of applying the results obtained in the production of building materials and carbonization hardening products based on nepheline slime.