钢渣排放量大、体积安定性和易磨性差、碱度高以及有害离子浸出等问题导致其利用率低，大量堆存占用土地并严重污染环境，热闷技术虽改善了安定性问题却降低了其水化活性，严重制约了钢渣资源化利用。课题组前期研究创新性发现钢渣各组成矿物碳酸化活性与其渗滤液中钙镁浸出性能密切相关，且碳酸化伴随着大量的放热促进其硅酸盐相快速水化生成C-S-H凝胶。本课题拟基于钢渣组成矿物元素浸出规律进一步优化碳酸化条件，提升碳酸化效率；定量分析钢渣碳酸化/水化产物中碳酸盐晶体与C-S-H凝胶体比例，研究C-S-H凝胶的Ca/Si比及胶凝特性随碳酸化程度的演变机理，碳酸盐晶型和晶体生长规律对钢渣制品强度和碱度等物理化学性能的影响机理；碳酸化对f-CaO和f-MgO的消解机理及与钢渣细度和制品体积安定性的关系；测试碳酸化钢渣制品的元素浸出特性，评价碳酸化对钢渣中重金属的固化作用和生物相容性，从而破解破钢渣资源化利用的技术瓶颈。

Steel slag has some disadvantages, such as large emissions, poor soundness and wear resistance, high alkalinity and ion dissolution, which result in low utilization, occupation of land for storage and serious environmental pollution. Although thermal stuffy technology improves the stability, but it reduces the hydration activity and restricts the resource utilization of steel slag. The previous study of my research group innovatively found that the carbonation reactivity of various constituent minerals of steel slag was closely related to the leaching concentration of calcium and magnesium elements in the leachate, and the large amount of exothermic heat in the carbonation reaction process promoted the rapid hydration of silicate minerals in steel slag to generate C-S-H gel. This project intends to further optimize the carbonation reaction conditions and improve the reaction efficiency based on the leaching law of mineral elements composed of steel slag. Rietveld method was used to quantitatively analyze the proportion of carbonate crystals and C-S-H gels in the carbonation/hydration products of steel slag. Study the Ca/Si ratio of C-S-H gel and the evolution mechanism of the cementitious characteristics with the degree of carbonation reaction, and the influence mechanism of carbonate crystal type and grain size on the physical properties such as strength and alkalinity of steel slag building materials. Research the carbonation digestion mechanism of f-CaO and f-MgO and its relationship with fineness of steel slag and soundness of steel slag building material products. The elemental leaching characteristics of carbonated steel slag building materials were tested to evaluate its curing effect on heavy metals and biocompatibility, and break through the technical bottleneck of resource utilization of steel slag.