Mineralization is an important means for emission reduction and utilization of CO₂. Industrial calcium-based by-products such as steelmaking slag and carbide slag are often used as inexpensive mineralizers for CO₂. In this investigation, the pH was tested on-line during the mineralization process of CO₂ and steelmaking slag, carbide slag and the compounded system of steelmaking slag and carbide slag. The characteristics of the raw materials and mineralization products were determined using XRD, XRF, LSA, FT-IR, SEM-EDX and TGA. The results indicated that there was a synergistic effect of steelmaking slag coupled with carbide slag for mineralization of CO₂, the mineralization rate was accelerated and mineralization efficiency increased. When the mass ratio of steelmaking slag and carbide slag was 1:1, the mineralization rate and efficiency were increased by 19.0 % and 23.1 %, respectively. The mineralization products of the compounded system covered on the surface of the steelmaking slag firstly, which can effectively avoid the covering on the surface of carbide slag particles, and it was beneficial to increase the mineralization rate and mineralization efficiency of carbide slag. The alkali excitation of steelmaking slag may be another reason to improve the mineralization efficiency. Furthermore, XRD, TGA and FT-IR revealed that there was unreacted Ca(OH)₂ in the mineralization products of carbide slag, but none in the products of the compounded system of steelmaking slag and carbide slag. The possibility of the scale-up route for CO₂ mineralization using SS/CS was discussed.

矿化是减少和利用CO ₂的重要手段。工业钙基副产品（例如炼钢炉渣和碳化炉渣）通常用作CO _2的廉价矿化剂。在这项研究中，在CO ₂和炼钢渣，碳化物渣以及炼钢渣和碳化物渣的复合体系的矿化过程中在线测试了pH值。特性小号使用XRD，XRF，LSA，FT-IR，SEM-EDX和TGA测定的原料及矿化产品。结果表明，炼钢渣与碳化物渣对CO _2的矿化具有协同作用。，矿化速度加快，矿化效率提高。当炼钢渣和碳化渣的质量比为1：1时，矿化率和效率分别提高了19.0％和23.1％。该复合体系的矿化产物首先覆盖在炼钢炉渣的表面，可以有效避免碳化物炉渣颗粒表面的覆盖，有利于提高碳化炉渣的矿化率和矿化效率。炼钢渣的碱激发可能是提高矿化效率的另一个原因。此外，XRD，TGA和FT-IR表明存在未反应的Ca（OH）₂碳化物渣的矿化产物中没有，而炼钢渣和碳化物渣的复合体系的产物中没有。讨论了使用SS / CS扩大CO ₂矿化规模的可能性。