System and method for carbon dioxide solidification

Abstract

Disclosed is a method for solidifying carbon dioxide into carbonate, in which carbon dioxide is stably converted into and solidified into carbonate (mineral facies) by using steel slag or natural mineral by extracting an alkali component by supplying an ammonium salt solvent as an extraction solvent to raw slag and injecting carbon dioxide into an extract solution supplied to a carbonation reactor to produce carbonate precipitate from the extract solution through the induction of a conversion reaction of the carbon dioxide into the carbonate precipitate. Then after the above two step are performed at least one an acetic acid solvent is supplied as an extraction solvent to the raw slag so as to finally extract an alkali component; and carbon dioxide is injected into an extract solution to produce carbonate precipitate from the extract solution through the induction of a conversion reaction of the carbon dioxide into the carbonate precipitate.

1 - 6 . (canceled) 
     
     
         7 . A system for solidifying carbon dioxide into carbonate, the system comprising:
 an extraction reactor configured to extract an alkali component by supplying an ammonium salt solvent as an extraction solvent to raw slag;   a carbonation reactor configured to inject carbon dioxide into an extract solution supplied to the carbonation reactor from the extraction reactor to produce carbonate precipitate from the extract solution through induction of a conversion reaction of the carbon dioxide into the carbonate precipitate, the extract solution containing the alkali component,   wherein the extraction reactor is further configured to supply an acetic acid solvent as an extraction solvent to the raw slag so as to finally extract an alkali component supply ammonium salt solvent as an extraction solvent to raw slag and injecting carbon dioxide into an extract solution at least one time; and   extraction reactor to be configured to the reactor itself to supply the acetic acid or ammonium salt or   wherein the carbonation reactor is further configured to inject carbon dioxide into an extract solution supplied to the carbonation reactor to produce carbonate precipitate from the extract solution through induction of a conversion reaction of the carbon dioxide into the carbonate precipitate, the extract solution containing the alkali component extracted using the acetic acid solvent.   
     
     
         8 . The system of  claim 7 , wherein ammonium salt solvent is supplied as an extraction solvent to raw slag and carbon dioxide injected into an extract solution several times or more, and then the acetic acid solvent is supplied to the raw slag collected after completion of thereof. 
     
     
         9 . The system of  claim 7 , wherein the ammonium salt is any one selected from the group including ammonium chloride, ammonium nitrate, and ammonium acetate. 
     
     
         10 . The system of  claim 7 , wherein the raw slag separately discharged from the extract solution containing the alkali component is collected and recycled.