水淬钢渣碳酸化固定CO_2

Carbon dioxide sequestration using water quenched steel slag

利用HSC-Chemistry软件平台对以气-液-固三相为基础的水淬钢渣碳酸化固定二氧化碳进行了热力学分析,结果表明,温度700 K以下钢渣主要含钙相在水溶液中能够自发与CO2反应,碳酸化固定CO2是可行的;并通过实验研究了反应时间、钢渣粒径、CO2流量及液固比等主要参数对水淬钢渣碳酸化固定CO2的影响。结果显示,在初期阶段反应迅速,固碳率在3 h达到27.9%,即固定二氧化碳的能力约为279 kg/t(钢渣),随后逐渐趋于平衡。粒度越细对固碳过程越有利,液固比及CO2流量影响不明显;XRD及SEM结果也验证了水淬钢渣固定CO2是可行的。

Gas-liquid-solid three phase based water quenched steel slag carbonate fixed carbon dioxide system were analyzed in thermodynamics using HSC-Chemistry software. Results indicated that the main Ca phases in slag could absorb carbon dioxide and it was entirely feasible to fix CO2 in aqueous solution under 700 K. Influencing factors were studied,including reaction time,particle size of the slag,flowrate of carbon dioxide and the mass ratio of liquid to solid. Results showed that the carbonation reaction occurred quickly at the initial stages,and then gradually tended to equilibrium. The efficiency of carbon sequestration was 27. 9 % in 3 hours,namely that the absorption capability of the fixed carbon dioxide was about 279 kg/t（ steel slag）. Results also showed that the reaction took place more readily with fine particle size. The mass ratio of liquid to solid and the flowrate of carbon dioxide had little impact on the efficiency of carbon sequestration. XRD and SEM results also verified the feasibility of CO2 capture by water quenched steel slag.