INTEGRATION OF LIMESTONE WASTE PROCESSING AND CCU TECHNOLOGIES IN THE PRODUCTION BUILDING MATERIALS

Abstract

Carbonate raw material processing generates significant limestone screenings and CO₂ emissions from the chemical decarbonization reaction (CaCO₃ → CaO + CO₂). Fragmented environmental measures fail to systematically reduce the overall environmental burden. This study develops an integrated approach to managing mineral and carbon flows. The methodology includes analysis of scientific publications, examination of technological schemes, balance modeling of material and carbon flows, and conceptual assessment of integrating Carbon Capture and Utilization (CCU) technologies into wet flue gas cleaning systems. Implementation of the integrated scheme enables the involvement of 85–95% of limestone screenings in secondary economic circulation. Process decarbonization calculations show CO₂ emissions reach approximately 0.418 t per ton of processed raw material (95% CaCO₃ content). CCU implementation with 60% capture efficiency reduces total CO₂ emissions by 30–40%. Comparative analysis reveals a synergistic environmental effect through comprehensive management of solid, particulate, and gaseous flows. Landfill volumes decrease by 6–10 times compared to fragmented management. The proposed concept aligns with circular economy principles and serves as a methodological basis for modernizing carbonate processing enterprises.