三种废渣的CO_(2)矿化封存性能及制备胶凝材料  

Storage Properties of CO_(2)Mineralization of Three Kinds of Waste Slag and Preparation of Cementitious Materials

作　　者：陈哲 吴春丽 夏勇 薛紫欣 麦俊明 CHEN Zhe;WU Chunli;XIA Yong;XUE Zixin;MAI Junming(Guangdong Building Materials Institute Co,.Ltd.)

机构地区：[1]广东省建筑材料研究院有限公司

出　　处：《广东建材》2024年第12期1-4,共4页Guangdong Building Materials

基　　金：广东环保集团有限公司“基于固废资源化利用的负碳技术科技创新中心项目”.

摘　　要：阳江市是华南地区重要基础原材料生产基地,产生电炉镍铁渣、高炉镍铁渣和不锈钢精炼渣三种废渣。本文对比分析三种废渣在干法和湿法矿化封存CO_(2)差异性,评估三种废渣碳化后制备胶凝材料可行性。研究表明:干法固碳中,不锈钢精炼渣、高炉镍铁渣和电炉镍铁渣矿化封存CO_(2)能力逐渐降低,碳化时间24h时,CO_(2)封存量分别为150g/kg、25g/kg、23g/kg;湿法固碳中,电炉镍铁渣和高炉镍铁渣固碳率与干法相似,不锈钢精炼渣固碳率随液固比增加出现先升高后降低趋势。三种废渣碳化后其胶凝活性均降低,且不锈钢精炼渣降低幅度更显著,28d活性指数降幅分别为21.9%、21.7%、35.7%。Yangjiang City is an important production base of basic raw materials in South China,which produces three kinds of waste slag,such as electric furnace nickel-iron slag,blast furnace nickel-iron slag and stainless steel refining slag.The differences of mineralization and storage of CO_(2)under the dry and wet direct carbonation process of the three kinds of waste slag are compared and analyzed,and the feasibility of preparing cementitious materials after carbonization of the three kinds of waste slag is evaluated.The results show that the CO_(2)storage capacity of stainless steel refining slag,blast furnace ferric nickel slag and electric furnace ferric nickel slag decreases gradually during dry carbon sequestration.When carbonization time is 24h,the CO_(2)storage capacity is 150g/kg,25g/kg and 23g/kg,respectively.In wet carbon sequestration process,the carbon sequestration rate of ferronickel slag in electric furnace and blast furnace is similar to that in dry process,and the carbon sequestration rate of stainless steel refining slag increases first and then decreases with the increase of liquid-solid ratio.After carbonization,the gelling activity of the three solid wastes decreased,and the decrease of the stainless steel refining slag was more significant,and the 28d activity index decreased by 21.9%,21.7%and 35.7%,respectively.

关 键 词：电炉镍铁渣 高炉镍铁渣 不锈钢精炼渣 碳化活性 胶凝活性 

分 类 号：X701[环境科学与工程—环境工程] TU526[建筑科学—建筑技术科学]