(2gc) Development of Cement Kiln Dust Recovery Process for CO2 Utilization

In many cement facilities, a large amount of cement kiln dust is generated during the production of cement clinker. The cement kiln dust is being considered to be one of the main cause of air pollution which significantly affect plant growth and biodiversity. However, since the cement kiln dust is mainly composed of CaO which can react with carbonate ions and thus it is possible to be utilized for CO₂ utilization. In this work, a novel cement kiln dust recovery process is developed for CO₂ utilization. The proposed process is composed of the following three procedures. First, the cement kiln dust reacts with water and the Ca(OH)₂ is generated for CO₂ utilization. Since the reaction with CaO and water is exothermic, a large amount of heat is produced and it is recovered to reboiler for amine regeneration. Second, to capture the CO₂, the amine solution is used and the rich amine is regenerated by recovering generated heat. Finally, the captured CO₂ is carbonated using Ca(OH)₂ and the CaCO₃ produced. As a result, the CO₂ capture efficiency is determined at approximately 91%. Thus, we believe that this work provides valuable insights into the efficient use of cement kiln dust and for CO₂ utilization in cost-effective and environmentally friendly way.