Abstract: The mineralization and utilization technology of CO₂ by means of blast furnace slag (BFS) is a route of CO₂ capture, utilization and storage (CCUS) with both environmental and economic benefits, which can reduce CO₂ emissions and realize the utilization for solid waste. This technology can achieve the “controlling waste by waste” purpose. Here, life cycle assessment method was used to simulate four CCUS scenarios by combining different CO₂ capture technologies (post-combustion capture system and oxy-combustion capture system) with two novel CO₂ mineralization processes, with the consumption of 1 t BFS as a research unit. Carbon emissions and cost under four CCUS scenarios from CO₂ capture, transportation and storage to product production were systematically calculated. The results showed that three scenarios can meet the requirements of CO₂ emissions reduction, including co-production of aluminum-rich products by mineralization under postcombustion capture system,  co-production of ammonium aluminum by mineralization under oxy-combustion capture system, and  co-production of aluminum-rich products by mineralization under oxy-combustion capture system. Their carbon storage efficiency was 29%, 32.7%, and 76.2%, respectively. Furthermore, the life cycle cost of those three scenarios was 544, 1384, and 530 CNY, respectively. Among them, scenario of co-production of ammonium aluminum by mineralization under oxycombustion capture system can store a large amount of CO₂ and obtain the largest profit (about 297 CNY), with a broad prospect of industrial application.

Key words: Phragmites australis, Tamarix ramosissima, growth period., soil enzyme