2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 17 - Sep 19, 2022新潟大学 五十嵐キャンパス
2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 17 - Sep 19, 2022新潟大学 五十嵐キャンパス
[S2-09]Formation of magnesium carbonate minerals under high pressure CO2 conditions
*Yuto Nishiki1,2, Masao Sorai2, Tsutomu Sato1(1. Eng., Hokkaido Univ., 2. AIST)
Keywords:
Geological CO2 storage,Hydromagnesite,Magnesite,Nesquehonite,Supercritical CO2
Mg-hydroxide powder (3 g) and ultrapure water (30 mL) were set in a stainless reaction vessel (50 mL) placed in an oven (40, 60, and 80℃) and pressurized up to 10 MPa using supercritical CO2. All Mg-hydroxide powder was dissolved, and Mg-carbonates were precipitated under all the conditions. The precipitates were identified as nesquehonite at 40℃, nesquehonite and magnesite at 60℃, and hydromagnesite and magnesite at 80℃. In addition to temperature, other parameters (e.g., CO2 pressure) are possibly determinants for mineral species of Mg-carbonate precipitates.