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为实现二氧化碳地质储存与资源化利用,利用高压釜控制温度和转速,模拟不同条件下二氧化碳地质储存过程中砂岩-盐水-超临界CO2的相互作用,对反应后岩石矿物进行扫描电镜观察,分析溶液pH,HCO3-和阳离子含量变化.结果表明:随着温度的升高,矿物溶蚀加剧;175℃条件下岩石矿物表面有碳酸盐矿物生成,有利于二氧化碳的地质储存;加入扰动条件后可以促进反应溶液混合,使岩石矿物表面溶液局部含量下降,导致岩石矿物的溶蚀加剧,新矿物生成量减少;随着扰动的加大,矿物溶蚀消耗H+过多,引起pH升高,溶液中出现OH-,部分阳离子形成氢氧化物沉淀,阻碍了碳酸盐矿物的生成,不利于二氧化碳的地质储存.
In order to realize the geological storage and resource utilization of carbon dioxide, the autoclave was used to control the temperature and rotation speed to simulate the interaction of sandstone-brine-supercritical CO2 during geological storage of CO2 under different conditions. The rock minerals after the reaction were observed by scanning electron microscopy, pH, HCO3- and cation. The results show that the dissolution of minerals aggravates with the increase of temperature, and carbonate minerals are formed on the surface of rock minerals at 175 ℃, which is favorable for the geological storage of carbon dioxide. The reaction solution is mixed to reduce the local content of the rock mineral surface solution, leading to the aggravation of the rock mineral dissolution and the decrease of the new mineral formation. As the disturbance increases, the mineral dissolution consumes too much H +, causing the increase of the pH. The OH- , Some of the cations formed hydroxide precipitation, hindered the formation of carbonate minerals, is not conducive to the geological storage of carbon dioxide.