Reactivity of Iron Bearing Minerals and CO2 Sequestration: A Multi-??Disciplinary and Experimental Approach

Schoonen, Martin A.¹ 

[1] Stony Brook Univ., NY (United States). Dept. of Geosciences

关键词: carbon sequestration;    mineral reactivity;    brine;    supercritical carbondioxide;    hematite;    pyrite;    siderite;   

DOI  :  10.2172/1166022
RP-ID  :  DOE-SBU--4633
PID  :  OSTI ID: 1166022

学科分类：地球科学(综合)

美国|英语

来源: SciTech Connect

【 摘 要 】

The reactivity of sandstones was studied under conditions relevant to the injection of supercritical carbon dioxide in the context of carbon geosequestration. The emphasis of the study was on the reactivity of iron-??bearing minerals when exposed to supercritical CO₂ (scCO₂) and scCO₂ with commingled aqueous solutions containing H₂S and/or SO₂. Flow through and batch experiments were conducted. Results indicate that sandstones, irrespective of their mineralogy, are not reactive when exposed to pure scCO2 or scCO₂ with commingled aqueous solutions containing H₂S and/or SO₂ under conditions simulating the environment near the injection point (flow through experiments). However, sandstones are reactive under conditions simulating the edge of the injected CO₂ plume or ahead of the plume (batch experiments). Sandstones containing hematite (red sandstone) are particularly reactive. The composition of the reaction products is strongly dependent on the composition of the aqueous phase. The presence of dissolved sulfide leads to the conversion of hematite into pyrite and siderite. The relative amount of the pyrite and siderite is influenced by the ionic strength of the solution. Little reactivity is observed when sulfite is present in the aqueous phase. Sandstones without hematite (grey sandstones) show little reactivity regardless of the solution composition.