School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
Sci Total Environ. 2022 Oct 20;844:157041. doi: 10.1016/j.scitotenv.2022.157041. Epub 2022 Jul 6.
The comprehensive consideration of climate warming and by-product management in the iron and steel industry, has a significant impact on the realization of environmental protection and green production. Blast furnace slag (BFS) and steel slag (SS), collectively called iron and steel slags, are the main by-products of steelmaking. The economical and efficient use of iron and steel slags to reduce greenhouse gas (GHG) emissions is an urgent problem to be solved. This paper reviewed the carbonization and waste heat recovery of iron and steel slags, and the utilization of iron and steel slags as soil amendments, discussed their application status and limitations in GHG reduction. Iron and steel slags are rich in CaO, which can be used as CO adsorbents to achieve a maximum concentration of 0.4-0.5 kg CO/kg SS. Blast furnace molten slag contains a considerable amount of waste heat, and thermal methods can recover more than 60 % of the heat energy. Chemical methods can use waste heat in the reaction to generate gas fuel, and iron in slags can be used as a catalytic component to promote chemical reaction. Waste heat recovery saves fuel and reduces the CO emissions caused by combustion. When iron and steel slags are used as soil amendments, the iron oxides, alkaline substances, and SiO in iron and steel slags can affect the emission of CH, NO, and CO from soil, microorganisms, and crops, and achieve a maximum reduction of more than 60 % of the overall GHG of paddy fields. Finally, This paper provided valuable suggestions for future GHG reduction studies of iron and steel slags in energy, industry, and agriculture.
全面考虑钢铁行业的气候变暖与副产物管理，对实现环境保护和绿色生产具有重要意义。高炉渣（BFS）和钢渣（SS）统称为钢铁渣，是炼钢的主要副产物。经济高效地利用钢铁渣来减少温室气体（GHG）排放是亟待解决的问题。本文综述了钢铁渣的碳化和余热回收，以及钢铁渣作为土壤改良剂的利用，讨论了它们在 GHG 减排中的应用现状和局限性。钢铁渣富含 CaO，可用作 CO 吸附剂，最大浓度可达 0.4-0.5 kg CO/kg SS。高炉熔渣含有相当数量的余热，热法可以回收超过 60%的热能。化学方法可以利用反应中的余热生成气体燃料，渣中的铁可用作催化成分来促进化学反应。余热回收可节省燃料并减少燃烧引起的 CO 排放。当钢铁渣用作土壤改良剂时，钢铁渣中的铁氧化物、碱性物质和 SiO 会影响土壤、微生物和作物中 CH、NO 和 CO 的排放，实现稻田 GHG 总排放量减少 60%以上。最后，本文为钢铁渣在能源、工业和农业领域的 GHG 减排研究提供了有价值的建议。
