Basic study on the preparation of high purity silica material from coal ash

Abstract

Coal ash emitted from coal-fired power plants is utilized for construction material, such as raw materials of cement and additives for concrete. In the future, if we can prepare the high purity silica material like silica filler from coal ash, it is expected to contribute to sustainable-growth societies. In this study, we investigated the appropriate conditions for extracting SiO₂ from coal ash with an alkaline solution, and the cleaning method for purifying silica. As a result of research, we were able to find these conditions, and confirmed the possibility of preparing the high purity silica material.