悬浮态碳化工艺对钢渣固碳效率和早期水化活性的影响  

Influence of Suspended State Carbonation Process on Carbonation and Early Hydration Activity of Steel Slag

作　　者：龙勇兵 刘来宝[1] 张高寅 胡广 黄妍菱 王伟龙 张礼华[1] LONG Yongbing;LIU Laibao;ZHANG Gaoyin;HU Guang;HUANG Yanling;WANG Weilong;ZHANG Lihua(School of Materials and Chemical,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学材料与化学学院,绵阳621010

出　　处：《硅酸盐通报》2025年第4期1319-1327,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52178254);四川省科技教育联合基金(2024NSFSC2018)。

摘　　要：钢渣碳化制备建筑材料是一种解决钢渣存储问题的有效途径。针对现有钢渣碳化工艺存在碳化时间长、钙转化率低等问题,本研究自主研发了一套悬浮态钢渣微粉碳化装置,探讨了在低水固比条件下,悬浮态钢渣固碳的最佳工艺参数。研究结果表明,最佳固碳反应参数为风速11 m/s、CO_(2)体积分数90%、水固比0.10。在此工艺条件下,钢渣微粉碳化240 s时,CO_(2)吸收率为4.85%,Ca转化率为17.32%。钢渣的碳化活性较高,碳化产物主要为方解石型CaCO_(3)。碳化时间增加,碳化钢渣水化放热量减少。钢渣对水泥的早期水化抑制作用明显,碳化能明显改善钢渣对水泥的早期水化抑制作用。悬浮态碳化工艺具有碳化时间短、钙转化率高的优点。该技术有助于钢铁企业实现钢渣资源化利用和减少碳排放,以期为钢渣固碳工艺的优化提供参考。The carbonation of steel slag for the production of building materials is an effective solution to the storage issues associated with steel slag.This study addressed the challenges of existing steel slag carbonation processes,such as prolonged carbonation time and low calcium conversion rate,by developing a novel suspended state steel slag powder carbonation device.The optimal process parameters for suspended state carbon fixation under low water-solid ratio were investigated.The results indicate that the optimal carbonation reaction parameters are:air velocity of 11 m/s,CO_(2) concentration of 90%(volume fraction),and water-solid ratio of 0.10.Under these conditions,after 240 s of carbonation of steel slag powder,the CO_(2) uptake reaches 4.85%,and the Ca conversion rate is 17.32%.The carbonation activity of steel slag is relatively high,with the primary carbonation product being calcite(CaCO_(3)).An increase in carbonation time leads to a reduction in the heat release during the hydration of the carbonated steel slag.The inhibitory effect of steel slag on the early hydration of cement is significant,but carbonation can notably improve this inhibitory effect.The suspended state carbonation process offers advantages of shorter carbonation time and higher calcium conversion rate.This technology aids steelmaking enterprises in achieving resource utilization of steel slag and reducing carbon emissions,providing a reference for the optimization of steel slag carbonation processes.

关 键 词：钢渣 悬浮态碳化 工艺优化 钙转化率 水化活性 

分 类 号：TU52[建筑科学—建筑技术科学]