Comparison of Two Processes Forming CaCO3 Precipitates by Electrolysis

Abstract

Abstract:As one of the carbon capture and utilization (CCU) technologies, mineral carbonation which has been introduced to reduce the carbon dioxide (CO 2 ) concentration in the atmosphere is a technology that makes it possible to capture CO 2 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 CaCl 2 solution to produce CO 2 absorbent needed to generate CaCO 3 , 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 CaCl 2 solution.

Recent Progress and Novel Applications in Enzymatic Conversion of Carbon Dioxide

“…Furthermore, the biomimetic CO2 storage approach does not need Current carbon storage research has primarily focused on sequestering CO 2 in underground geologic formations such as saline aquifers, depleted oil and gas fields, and unmineable coal seams [59]. Although these methods have the advantage of being relatively low-cost, sequestration in geologic formations still has several potential issues including permanence, long-term monitoring, and verification, with many unknown effects and potential risks still to be determined [60]. Thus, carbon mineralization, where CO 2 is reacted with metal cations such as calcium to form calcium carbonate (CaCO 3 ), is considered an effective alternative to conventional geologic sequestration [61].…”

Electrochemical Capture and Storage of CO2 as Calcium Carbonate

“…There have also been reports on the electrochemical synthesis of CaCO 3 from bicarbonates often carried out at room temperature and relatively low pressure [15c,f,16] . Recently, a two‐step process for CaCO 3 precipitation was reported, which involved electrolysis of CaCl 2 in water, followed by blowing the solution with CO 2 to precipitate the desired product [17] . SrCO 3 also has applications, which includes the production of pigments, ceramics, criers, paints, pyrotechnics, ferrite magnets for small direct current (DC) motors and iridescent materials [18] .…”