3种典型工业固废的CO_(2)矿化封存性能  

Comparison of three typical industrial solid wastes on the performance of CO_(2) mineralization and sequestration

作　　者：张亚朋 崔龙鹏[1] 刘艳芳[1] 李红伟[1] 王志强[1] 郎子轩 ZHANG Yapeng;CUI Longpeng;LIU Yanfang;LI Hongwei;WANG Zhiqiang;LANG Zixuan(SINOPEC Research Institute of Petroleum Processing,Beijing 100083,China)

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《环境工程学报》2021年第7期2344-2355,共12页Chinese Journal of Environmental Engineering

基　　金：中国石油化工股份有限公司项目(417002-4,418020-5)。

摘　　要：选择3种典型的工业固体废物-电石渣(CS)、钢渣(SS)和煤气化粉煤灰(FA),比较研究此3种固废在干法和湿法直接碳酸化工艺下的CO_(2)封存性能。结合热重(TG)、X射线衍射(XRD)等分析表征方法,揭示了3种固废的碳酸化反应规律及干法、湿法直接碳酸化的反应机理。结果表明:干法固碳中,CS、SS-1、FA、SS-2矿化封存CO_(2)能力依次降低,CO_(2)封存量分别为382.21、70.78、34.81和25.99 g·kg^(−1);湿法固碳中,CS、SS-1、SS-2的CO_(2)封存量均高于干法固碳,分别为613.4、191.9和106.8 g·kg^(−1),而FA的CO_(2)封存量下降为8.4 g·kg^(−1)。CaO含量是影响CO_(2)封存量的关键因素,其他含钙的物相与矿化反应相关。固废湿法固碳性能一般优于干法,湿法碳酸化过程中,CO_(2)溶于水形成碳酸根离子后,更易与固废中溶出的钙镁离子反应;而FA中非晶态钙成分在去离子水中不易溶出,湿法固碳性能较差,但其在高温下不稳定,在干法高温环境中能与CO_(2)发生反应生成CaCO_(3),其干法固碳性能优于湿法。The capacities of three typical industrial solid wastes,i.e.carbide slag(CS),steel slag(SS)and fly ash(FA),in CO_(2) capture and storage by dry and wet direct carbonation processes were studied.The carbonation reaction patterns of the three solid wastes and the reaction mechanisms of direct carbonation in dry and wet methods were revealed by TG and XRD.Results showed that the CO_(2) sequestration capacities of CS,SS-1,FA and SS-2 in dry process were 382.21,70.78,34.81 and 25.99 g·kg^(−1) respectively.In wet process,the CO_(2) sequestration capacities of CS,SS-1,SS-2 were 613.4,191.9 and 106.8 g·kg^(−1) respectively,which are higher than that of the dry method.However,the CO_(2) sequestration capacity of FA decreased to 8.4 g·kg^(−1).CaO content is the key factor affecting CO_(2) storage capacity,and other calcium-containing phases are related to mineralization reactions.The CO_(2) capture and storage performances of solid waste by wet method are generally better than that of the dry method,as CO_(2) dissolves in water and forms carbonate ion in the process of wet carbonation which is easier to react with calcium and magnesium ions dissolved from solid wastes.However,the amorphous calcium in FA is not easy to dissolve in deionized water,leading to the poor performance in the wet carbon sequestration.The amorphous calcium in FA is unstable at high temperature,which can react with CO_(2) to form CaCO_(3) in high temperature during the dry process.Thus,the CO_(2) capture and storage performances of FA by the dry method is better than by the wet method.

关 键 词：钢渣 电石渣 粉煤灰 封存CO_(2) 碳酸化反应 

分 类 号：TQ172.9[化学工程—水泥工业]