氧化钙碳酸化反应条件探究及其产物分析  

Carbonation reaction conditions and product analysis of calcium oxide

作　　者：王正豪 方燕红 王成瑞 段华美[1] WANG Zheng-hao;FANG Yan-hong;WANG Cheng-rui;DUAN Hua-mei(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《连铸》2023年第2期106-112,共7页Continuous Casting

基　　金：四川省科技计划基金资助项目(2022YFQ0037);中央高校基本建设基金资助项目(2020CDJ-LHSS-010)。

摘　　要：在碳中和的背景下,利用钢渣进行碳捕集和碳储存能够同时达到碳减排和“以废治废”的目的。由于钢渣含有较多的游离氧化钙,因此未经处理的钢渣安定性差且难以利用到其他领域。钢渣碳酸化反应后,其中的游离氧化钙含量大幅降低,可应用于建筑材料中,是最具应用前景的钢渣处理方法。因此,考察纯氧化钙碳酸化反应条件对利用钢渣固碳提高安定性的方法具有直接的指导意义。通过FactSage对CaO和Ca(OH)_(2)碳酸化进行热力学计算,结果表明在0~900℃内,两者都能自发进行碳酸化反应,并开展试验考察了焙烧温度、CaO质量、液固比和CO_(2)流速4个因素对CaO碳酸化率的影响规律,试验得出当焙烧温度为700℃、CaO质量为3 g、液固比为1.67、CO_(2)流速为35 mL/min时,碳酸化率最高,为60.9%。本研究结果可为钢渣资源化利用提供参考。In the context of carbon neutrality,carbon capture and storage using steel slag can achieve both carbon emission reduction and“using waste to treat waste”.Since steel slag contains more free calcium oxide,untreated steel slag has poor stability and is difficult to be used in other fields.After carbonation of steel slag,the free calcium oxide content of steel slag is greatly reduced,which can be used in building materials.It is the most promising method for steel slag treatment.Therefore,it is of direct guiding significance to investigate the carbonation reaction conditions of pure calcium oxide for improving the stability of carbon fixation by steel slag.The thermodynamic calculation of CaO and Ca(OH)_(2) carbonation was carried out by FactSage.The results showed that both CaO and Ca(OH)_(2) could spontaneously carbonate at 0-900℃.The influence of calcination temperature,CaO mass,liquid-solid ratio and CO_(2)flow rate on CaO carbonation rate was investigated.The results show that when the calcination temperature is 700℃,the mass of CaO is 3 g,the liquid-solid ratio is 1.67,and the CO_(2)flow rate is 35 mL/min,the carbonation rate is the highest,which is 60.9%.The results of this study can be a reference for improving the resource utilization of steel slag.

关 键 词：钢渣 碳减排 氧化钙 热力学计算 碳酸化反应 

分 类 号：X701[环境科学与工程—环境工程] X757[化学工程—无机化工] TQ132.32