Abstract
As one of the carbon capture and utilization (CCU) technologies, mineral carbonation which has been introduced to reduce the carbon dioxide (CO2) concentration in the atmosphere is a technology that makes it possible to capture CO2 and recycle byproducts as resources. However, existing mineral carbonation requires additional energy and costs, as it entails high temperature and high pressure reaction conditions. This study compared two processes which electrolyze NaCl and CaCl2 solution to produce CO2 absorbent needed to generate CaCO3, and which were conducted at room temperature and pressure unlike existing mineral carbonation. As a result, high-purity calcite was obtained through Process 1 using NaCl solution, and aragonite and portlandite were obtained in addition to calcite through Process 2 (two steps) using CaCl2 solution.
Highlights
Carbon dioxide (CO2 ) accounts for more than 88% of greenhouse gas emissions and has contributed more than 55% to the greenhouse effect [1,2]
The magnesium-based mineral carbonation process is complicated and should be conducted in high temperature and high pressure conditions, so the facility where it is conducted needs to be equipped for the high risk group [7,8,9]
This study introduces a mineral carbonation process undertaken with less energy by using electrolysis technology with a porous ceramic membrane as ion channel and separator
Summary
Carbon dioxide (CO2 ) accounts for more than 88% of greenhouse gas emissions and has contributed more than 55% to the greenhouse effect [1,2]. The magnesium-based mineral carbonation process is complicated and should be conducted in high temperature and high pressure conditions, so the facility where it is conducted needs to be equipped for the high risk group [7,8,9] For this reason, this study introduces a mineral carbonation process undertaken with less energy by using electrolysis technology with a porous ceramic membrane as ion channel and separator. Khoo et al [13], extracting magnesium oxide or hydroxide from serpentine requires heating to a temperature of 500 ◦ C or higher, and high temperature reaction conditions are needed again in the hydration process after extraction [14] To reduce these problems, our previous study and this study have introduced a process of electrolyzing chloride salts present in seawater and producing alkaline solution, which is a CO2 absorbent. This present work focuses on the comparison of the characterization and yield of final products for our previous and proposed processes
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