利用赤泥捕获CO_2反应特性  

Reaction characteristics of CO_2 captured by red mud

作　　者：伊元荣[1,2] 韩敏芳[1] 于立安[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]新疆大学资源与环境科学学院,新疆乌鲁木齐830046

出　　处：《化工学报》2011年第9期2635-2642,共8页CIESC Journal

基　　金：高等学校学科创新引智计划(B08010);北京市清洁能源学重点学科

摘　　要：引言 中国是世界上最大的煤炭生产国和消费国,煤炭产量占世界总产量的三分之一,也是目前少数几个以煤炭为主要能源的国家之一。大量煤炭的燃烧导致我国CO2排放量急剧增加,根据世界银行数据库估计，2000～2008年中国CO2年排放总量从27亿吨提高到70亿吨，年平均增长率为12．28％，其累计排放量为415亿吨碳当量。Red mud is an alkaline solid waste released from Al2O3 smelting and can be used as capture agent to absorb CO2 in fume.In this paper,red mud from Bayer process of China Aluminum Corporation was selected and used,and the effect of reaction temperature,time,and ratio of solid to liquid,agitation speed and CO2 flow rate on absorbing efficiency of red mud was investigated to obtain the best process parameters and conditions.The results show that one gram fluidic red mud containing 44.12%（mass） water can capture 0.11—0.12 g CO2 at 40℃,under the ratio of solid to liquid of 1∶10,the reaction time of 120 min,the agitation speed of 700 r·min^-1 and the CO2 gas flow rate of 0.25 L·min^-1.The properties of red mud before and after absorbing CO2 were characterized by XRD,SEM,BET,and FT-IR.The data from XRD show that main components of red mud are Ca2SiO4,CaCO3,Na2Si2O5,CaTiO3,Ca3Si2O5,Ca3Al2O6,and NaCO3,after the reaction with CO2,the peaks of Ca2SiO4,Na2Si2O5 and Na2CO3 in XRD pattern disappear.Furthermore,owing to the alkaline substances in red mud can react with CO2 to get carbonates;some new phases can be found in the XRD spectrum.The analysis by SEM,BET and FT-IR imply that the microstructures and shapes of red mud have occurred a change and are different before and after capturing CO2.These data results show that red mud can be used for capturing CO2 in fume and provide an effective way with low cost for reducing carbon emissions.

关 键 词：赤泥 CO2捕获 以废治废 

分 类 号：TQ172.9[化学工程—水泥工业]