Method of fixing carbon dioxide

Abstract

A method and system of fixing carbon dioxide is provided. After metal ion components are extracted from, e.g., natural mineral or steel slag through acid treatment, carbon dioxide is injected to fix carbon dioxide by carbonating the same. Since the procedure of pH adjustment is unnecessary, the reaction is carried out effectively and a continuous process is enabled. Accordingly, the disclosed method of fixing carbon dioxide enables effective removal of carbon dioxide produced from the steelmaking industry, thereby significantly reducing greenhouse gas emission and allowing recycling of the discarded steel slag.

1 - 13 . (canceled) 
     
     
         14 . A system for fixing carbon dioxide comprising:
 a first device configured to treat slag with an acid to extract metal ion components;   a second device configured to inject carbon dioxide into an extraction solution containing the extracted metal ion components to carbonate the same;   a first tank configured to receive a solution in which the carbonates resulting from the injection of carbon dioxide are dissolved and to store the resulting carbonates; and   a second tank configured to receive the stored dissolved carbonates and adjust the pH to a predetermined range to separate the carbonates.