METHOD OF FIXING CARBON DIOXIDE

• US 20120134902A1
• Filed: 04/06/2011
• Published: 05/31/2012
• Est. Priority Date: 11/30/2010
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Hyundai Steel Company, Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Hyundai Steel Company, Kia Motors Corporation (Kia Corp.)
• Inventors: Chung, Sung Yeup, Lee, Ki Chun, Cho, Min Ho, Sonh, Seok Gyu, Park, Dong Cheol
• Granted Patent: US 8,845,989 B2
• Time in Patent Office: Days
• US Class Current: 423/157
• CPC Class Codes: B01D 2251/304 of sodium
• CPC Class Codes: B01D 2251/306 of potassium
• CPC Class Codes: B01D 2251/402 of magnesium
• CPC Class Codes: B01D 2251/404 of calcium
• CPC Class Codes: B01D 2251/602 Oxides
• CPC Class Codes: B01D 2252/10 Inorganic absorbents chemical reactants B01D2251/00
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01D 53/73 After-treatment of removed components
• CPC Class Codes: B01J 10/00 Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor B01J19/08 takes precedence; separation, e.g. distillation, also combined with chemical reactions B01D, e.g. B01D3/009
• CPC Class Codes: C01B 32/60 Preparation of carbonates or bicarbonates in general of percarbonates C01B15/10; of specific carbonates or bicarbonates according to the cation C01B-C01G
• CPC Class Codes: C01F 11/181 Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
• CPC Class Codes: C04B 5/06 Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
• CPC Class Codes: C21B 2400/02 Physical or chemical treatment of slags
• CPC Class Codes: C21B 3/06 Treatment of liquid slag slag wool C03B; slag stones C04B
• CPC Class Codes: C22B 7/04 Working-up slag
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 10/122 by capturing or storing CO2
• CPC Class Codes: Y02P 10/146 Perfluorocarbons [PFC]; Hydrofluorocarbons [HFC]; Sulfur hexafluoride [SF6]
• CPC Class Codes: Y02P 10/20 : Recycling
• CPC Class Codes: Y02P 20/151 : Reduction of greenhouse gas [GHG] emissions, e.g. CO2
• CPC Class Codes: Y02W 30/50 : Reuse, recycling or recovery technologies

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.

Claims

1. A method of fixing carbon dioxide comprising:

(a) treating natural mineral or steel slag with an acid to extract metal ion components;

(b) injecting carbon dioxide into an extraction solution containing the extracted metal ion components in (a) to carbonate the same;

(c) transferring a solution in which the resulting carbonates in (b) are dissolved to a dissolved carbonate storage tank and storing the same; and

(d) transferring the stored dissolved carbonates to a carbonate separation/purification tank and adjusting pH to 7 or above to separate the carbonates.

2. The method of fixing carbon dioxide according to claim 1, wherein said treating with the acid is performed at pH 3-5.

3. The method of fixing carbon dioxide according to claim 1, wherein said carbonating is performed at normal temperature under normal pressure.

4. The method of fixing carbon dioxide according to claim 1, wherein said carbonating is performed at a carbon dioxide injection rate of 2 L/min and is completed within 5 minutes.

5. The method of fixing carbon dioxide according to claim 1, wherein the steel slag is one of a group consisting of slag, electric furnace slag or converter slag produced from the ironworks during blast furnace, converter or oxygen blowing processes.

6. A method of fixing carbon dioxide comprising:

(a) treating slag with an acid to extract metal ion components;

(b) injecting carbon dioxide into an extraction solution containing the extracted metal ion components in (a) to carbonate the same;

(c) transferring a solution in which the resulting carbonates in (b) are dissolved to a first tank and storing the resulting carbonates in the first tank; and

(d) transferring the stored dissolved carbonates to a carbonate second tank and adjusting pH to a predetermined range to separate the carbonates.

7. The method of fixing carbon dioxide according to claim 6, wherein said treating with the acid is performed at pH 3-5.

8. The method of fixing carbon dioxide according to claim 6, wherein said carbonating is performed at a temperature between 0-40°

C. and the pressure is between 0.1-5 atm.

9. The method of fixing carbon dioxide according to claim 6, wherein said carbonating is performed at a temperature between 10-25°

C. and the pressure is between 0.1-2 atm.

10. The method of fixing carbon dioxide according to claim 6, wherein said carbonating is performed at a carbon dioxide injection rate of 2 L/min and is completed within 5 minutes.

11. The method of fixing carbon dioxide according to claim 6 wherein slag is steel slag and the steel slag is one of a group consisting of electric furnace slag or converter slag produced from the ironworks during blast furnace, converter or oxygen blowing processes.

12. The method of fixing carbon dioxide according to claim 6 wherein slag is nature mineral slag.

13. The method of fixing carbon dioxide according to claim 6 wherein the adjusted predetermined range for the pH is 7 or above.

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.