改性镁渣的湿法碳酸化工艺
Technique of wet carbonation of modified magnesium slag
孙伟吉 1刘浪 1方治余 1朱梦博 1解耿 1何伟 1高宇恒1
作者信息
- 1. 西安科技大学能源学院,陕西西安 710054;西安科技大学矿山功能性充填技术研究中心,陕西西安 710054
- 折叠
摘要
碱基工业固废的碳酸化反应是一种矿化吸收CO2并减少温室气体排放的固碳策略之一.本研究首次引入湿法碳酸化工艺,通过借助X射线衍射、红外光谱测试、热重分析等实验测试,重点探究了温度变化、搅拌速度、碳酸化时间和液固比例对改性镁渣碳酸化反应的影响,进而讨论了 4种因素下改性镁渣的碳酸化产物与固碳效率.结果表明,改性镁渣的矿物成分主要以β-C2S为主,是一种具有良好储存CO2能力的工业固废,碳酸化产物主要以方解石型碳酸钙晶体和二氧化硅凝胶为主.碳酸化反应后,改性镁渣碳酸化产物的粒径显著增大,比表面积减小,粒径分布变均匀,粒径分布范围变窄.当碳酸化反应温度为60℃、通气时间为30min、液固比为10mL/g、搅拌速度为600r/min时,改性镁渣的固碳效率达到最大(28.4％),即1kg改性镁渣可以矿化吸收0.284kg CO2.因此,湿法碳酸化工艺对改性镁渣的回收利用及CO2捕集均具有很大的应用潜力.
Abstract
Carbonation reaction of alkali-based industrial solid waste is one of the carbon sequestration strategies for mineralization to absorb CO2 and reduce greenhouse gas emissions.In this study,the wet carbonation process was introduced for the first time,and through experimental tests using XRD,FTIR and TG-DTG,it was focused on exploring the effects of temperature change,stirring speed,carbonation time and liquid-solid ratio on the carbonation reaction of modified magnesium slag,and then discussed the carbonation products and carbon sequestration efficiency of modified magnesium slag under the four factors.The results showed that the mineral composition of modified magnesium slag was mainly dominated by β-C2S,which was an industrial solid waste with good CO2 storage capacity,and the carbonation products were mainly dominated by calcite-type calcium carbonate crystals and silica gel.After the carbonation reaction,the particle size of the modified magnesium slag carbonation product increased significantly,the specific surface area decreased,the particle size distribution became more uniform and the particle size distribution range became narrower.When the carbonation reaction temperature was 60℃,the aeration time was 30min,the liquid-solid ratio was 10mL/g and the stirring speed was 600r/min,the carbon sequestration efficiency of modified magnesium slag reached the maximum(28.4％),i.e.1kg of modified magnesium slag could be mineralized to absorb 0.284kg of CO2.Therefore,the wet carbonation process had a great application for the recycling of modified magnesium slag and the carbon dioxide sequestration potential.
关键词
二氧化碳捕集/多相反应/废物处理/湿法碳酸化/固碳效率Key words
CO2 capture/multiphase reaction/waste treatment/wet carbonation/sequestration efficiency引用本文复制引用
基金项目
陕西省重点研发计划"两链"融合重点专项(2023-LL-QY-07)
国家自然科学基金面上项目(52222404)
国家自然科学基金面上项目(52074212)
国家自然科学基金青年基金(52204175)
国家自然科学基金青年基金(52004206)
出版年
2024
国家科技期刊平台
NSTL
万方数据