玄武岩矿化封存技术是CO2地质封存领域的重要方法,是实现安全固碳最具潜力的技术之一,可作为大规模CO2减排的重要组成。采集了海南洋浦、海口及福建漳州地区的天然玄武岩样品,采用高温高压矿化反应实验,探究了不同温度和反应时间对玄武岩矿化反应效率的影响,并利用XRD、XRF、ICP、SEM-EDS和CT-scan等表征技术对矿化反应前后岩石及溶液样品进行分析。实验结果表明,玄武岩矿化反应效率随温度升高和反应时间延长而增大,反应过程遵循典型的溶解−沉淀机制。其中,海南地区样品的矿化效果更为显著,适合开展大规模矿化封存实践。此外,基于室内矿化实验数据,构建了更加合理的封存潜力评估公式,并以海南地区为例进行了封存潜力评估,结果显示海南地区玄武岩具有较大的碳封存潜力,该潜力评价方法具有较高可信度与适用性。本研究为玄武岩矿化封存项目的开展提供了重要理论依据,以期推进“双碳”目标下的CO2矿化封存技术的发展。

Basalt mineralization storage technology is an important method in the field of CO2 geological storage,and it is one of the mostpromising technologies to achieve safe carbon sequestration,which can be used as an important component of large-scale CO2 emissionreduction. In this study,natural basalt samples from Yangpu,Haikou and Zhangzhou in Hainan Province were collected,and the effects ofdifferent temperatures and reaction times on the reaction efficiency of basalt mineralization were explored by high-temperature and high-pressure mineralization reaction experiments, and the rock and solution samples before and after the mineralization reaction wereanalyzed by characterization techniques such as XRD,XRF,ICP,SEM-EDS and CT-scan. The experimental results show that the reactionefficiency of basalt mineralization increases with the increase of temperature and the extension of reaction time,and the reaction processfollows a typical dissolution-precipitation mechanism. Among them, the mineralization effect of the samples in Hainan is moresignificant,which is suitable for large-scale mineralization and storage practice. In addition,based on the experimental data of indoormineralization,a more reasonable formula for assessing the storage potential is constructed,and the storage potential is evaluated bytaking Hainan as an example,and the results show that the basalt in Hainan has a large carbon sequestration potential,and the potentialevaluation method has high credibility and applicability. This study provides an important theoretical basis for the development of basaltmineralization storage projects,in order to promote the development of CO2 mineralization storage technology.

0 引言

1 材料与方法

   1.1 实验材料

   1.2 实验装置

   1.3 实验方法

2 结果与讨论

   2.1 温度对矿化反应效率的影响

   2.2 反应时间对矿化反应效率的影响

   2.3 次生矿物形貌与组分分析

3 玄武岩矿化封存潜力评价

   3.1 玄武岩封存潜力评价方法

   3.2 封存潜力评估公式构建

   3.3 海南地区封存潜力计算

4 结论