钢渣及电石渣与废弃混凝土固化储存CO_2基本参数研究

对钢渣、电石渣、废弃混凝土等固体废弃物碳酸化固化储存温室气体二氧化碳(CO2)进行研究。实验从固体废弃物颗粒粒径、水分添加量等因素,考察碳酸化固化储存二氧化碳(CO2)的效果,并利用XRD、FTIR和SEM对反应机理进行分析。结果表明,固体废弃物颗粒粒径越小,二氧化碳(CO2)固化效率越高。水分添加量过低或过高均不利于碳酸化反应的进行,适宜的水分添加量为4kg/kg。XRD和FTIR分析表明,固体废弃物中的大量的CH、硅酸三钙(C3S)和氧化钙(CaO)转化为碳酸钙(CaCO3),以达到固化储存二氧化碳(CO2)的效果。SEM实验结果表明,经碳酸化处理后固体废弃物颗粒表面生成颗粒状的晶体物质。电石渣,钢渣及废弃混凝土对二氧化碳(CO2)固化效率分别为81%,76%和49%;每千克电石渣,钢渣及废弃混凝土分别可以固化二氧化碳(CO2)气体0.094kg,0.088kg及0.057kg。

Study of the Basic Parameters of CO2 Sequestration by Steel Slag, Carbide Slag and Waste Concrete

The Sequestration of CO2 by carbonating solid waste（include steel slag,carbide slag and waste concrete） was Investigated.The influence factors（i.e.particle size of solid waste and moisture content） and effect of accelerated carbonation were evaluated.In addition,the major mineral changes in solid waste after carbonation were investigated by XRD、FTIR and SEM.It shows that smaller particle size of solid waste leaded to higher carbonation effect and more CO2 sequestration.Much lower or higher moisture content had disadvantage effect on CO2 sequestration,and the optimum was 4 kg/kg.The XRD and FTIR analyses indicated that CH、C3S and CaO in soild waste could change into CaCO3 to sequestrate CO2.and aggregate of dog-like crystals on the surface of carbonated specimens can be observed by SEM.The efficiency of CO2 storage by steel slag,carbide slag and waste concrete were 81%,76% and 49%;and 0.094 kg,0.088 kg and 0.057 kg CO2 could be sequestrated by steel slag,carbide slag and waste concrete per kilogram.