| Abstract |
| New technologies need to be developed in the ironmaking process to reduce carbon dioxide emissions. To achieve this, in recent years steelmakers have been working to reduce coke usage by increasing thermal energy efficiency. However, it is very difficult to reduce coke consumption while maintaining production, because the level of energy efficiency of steelmakers in Korea is already among the world’s highest. Therefore, we devised an idea that can dramatically reduce carbon dioxide emissions by agglomerating iron ore without using thermal energy. This is a method that uses a curing reaction of sodium silicate and carbon dioxide gas contained in water glass after briquetting a mixture of ultra-fine ore and water glass. Carbon dioxide gas is not emitted because coke is not required. In this study, to investigate the applicability of this idea, the strength characteristics of the briquettes were measured and compared according to the preparation and reaction conditions. As a result, the highest compressive strength was obtained when the binder content was 5 wt%, the flow rate of the reaction gas was 20 L/min, and the reaction time was 10 seconds. Also, a shatter index similar to that of commercial sintered ore was measured when the molding pressure was 4 ton/cm2 or more.
(Received November 20, 2019; Accepted May 10, 2020) |
|
|
| Key Words |
| ultra-fine ore, agglomeration process, carbon dioxide emission reduction |
|
|
 |
|
