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改性镁渣的湿法碳酸化工艺

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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.
Technique of wet carbonation of modified magnesium slag
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.

CO2 capturemultiphase reactionwaste treatmentwet carbonationsequestration efficiency

孙伟吉、刘浪、方治余、朱梦博、解耿、何伟、高宇恒

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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

二氧化碳捕集 多相反应 废物处理 湿法碳酸化 固碳效率

陕西省重点研发计划"两链"融合重点专项国家自然科学基金面上项目国家自然科学基金面上项目国家自然科学基金青年基金国家自然科学基金青年基金

2023-LL-QY-0752222404520742125220417552004206

2024

10.16085/j.issn.1000-6613.2023-0660

化工进展
中国化工学会,化学工业出版社

化工进展

CSTPCD北大核心
影响因子：1.062
ISSN：1000-6613
年,卷(期)：2024.43(4)
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