不同实验条件下利用二氧化碳合成片钠铝石的固碳研究  

Carbon sequestration research of synthesizing dawsonite using CO_(2)under different experimental conditions

作　　者：曲希玉 温竞凯 袁勇 施凯腾 陈铁鑫 QU Xiyu;WEN Jingkai;YUAN Yong;SHI Kaiteng;CHEN Tiexin(College of Earth Science and Technology,China University of Petroleum(East China),Qingdao 266580,China;Qingdao Key Laboratory of Offshore CO_(2) Geological Storage,Qingdao 266237,China;Qingdao Engineering Research Center of Offshore CO_(2) Geological Storage,Qingdao 266237,China;Shandong Engineering Research Center of Offshore CO_(2) Geological Storage,Qingdao 266237,China;Laboratory for Marine Mineral Resources,Qingdao Marine Science and Technology Center,Qingdao 266237,China;Qingdao Institute of Marine Geology,China Geology Survey,Qingdao 266237,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580 [2]青岛市海洋地质碳封存重点实验室,青岛266237 [3]青岛市海洋地质碳封存工程研究中心,青岛266237 [4]海洋地质碳封存山东省工程研究中心,青岛266237 [5]青岛海洋科技中心海洋矿产资源评价与探测技术功能实验室,青岛266237 [6]中国地质调查局青岛海洋地质研究所,青岛266237

出　　处：《海洋地质前沿》2025年第3期89-98,共10页Marine Geology Frontiers

基　　金：山东省自然科学基金“咸水层储集体CO_(2)的固化过程及主要固碳矿物的富集条件研究”(ZR2024MD078);中国地质调查局项目“我国东部海域地质碳封存选区调查评价”(DD202503023);国家自然科学基金“南黄海CSDP-2井二叠系砂岩储层致密化过程及其对油气充注事件的响应”(42206234);自然资源部科技战略研究项目“海底地质碳封存战略研究”(2023-ZL-18)。

摘　　要：CO_(2)的矿物捕获是最持久、最稳定的地质封存形式。片钠铝石作为一种天然的CO_(2)示踪矿物,其形成与CO_(2)注入密切相关,也是CO_(2)地质封存的重要固碳矿物。片钠铝石在地质背景中大量稳定存在的条件是制约CO_(2)矿化捕获的关键问题,也是寻找CO_(2)地质埋藏地点的重要影响因素。为了探索利用CO_(2)快速合成片钠铝石的条件,对pH(8.5/9/9.5/10/10.5)、温度(100/120/140/160/180/200℃)和反应时间(6/12 h)3个主要影响因素进行了比较实验,并基于扫描电镜、X射线衍射分析阐明了合成片钠铝石的最佳条件。实验表明:在pH为8.5~10.5和温度为100~180℃的范围内,产物均为纯片钠铝石,合成量随pH和温度的升高呈先增加后减少的趋势,在200℃的温度下,片钠铝岩的结晶度降低,拟薄水铝石的含量增加。延长反应时间对产品质量没有明显的促进作用,在200℃下延长反应时间反而会加速片钠铝石的溶解。总的来说,140℃和pH 9.5是CO_(2)合成片钠铝石的最佳条件,也可能是地质封存CO_(2)的理想条件。Mineral trapping of CO_(2)is the most durable and stable form of geological storage.As a natural CO_(2)tracer mineral,the formation of dawsonite is closely related to CO_(2)infusion,and it also be an important carbon fixation mineral for CO_(2)geological storage.The condition of massive and stable presence of dawsonite in geological background is a key issue that constrains the CO_(2)mineralization capture,and is also an important influencing factor in the search for CO_(2)geological burial sites.To explore the conditions for the rapid synthesis of dawsonite with CO_(2),we conducted comparative experiments for three main influencing factors of temperature(100/120/140/160/180/200℃),pH(8.5/9/9.5/10/10.5),and reaction time(6/12 h).Based on scanning electron microscopy,X-ray diffraction analysis was conducted to clarify the optimal conditions for the synthesis of dawsonite.The experiments suggested that in the range of pH 8.5–10.5 and temperature 100–180℃,the products were all pure dawsonite,and the synthesis amount showed a trend of increasing and then decreasing with the increase of pH and temperature.At 200℃,the crystallinity of dawsonite decreased and the content of pseudo boehmite increased.The prolongation of reaction time did not have an obvious promotion effect on the quality of the products,and the prolongation of reaction time at 200℃would accelerate the dissolution of dawsonite instead.Overall,140℃and pH 9.5 are the best conditions for the synthesis of dawsonite from carbon dioxide and probably the ideal conditions for geological sequestration of carbon dioxide.

关 键 词：片钠铝石 CO_(2)水岩相互作用 水热合成 最佳条件 CO_(2)矿物封存 

分 类 号：P744.4[天文地球—海洋科学] P736