Abstract
To obtain high quality rice husk ash (RHA), the rising burning temperature at fire place should be controlled low enough to avoid decreasing specific surface area of amorphous phase of silica in RHA, and the duration of incineration should be long enough to burn out fixed carbon. In this study, a newly stirring furnace for producing high quality RHA is developed. This furnace has a stirrer in its center and the rice husk was incinerated while stirred by horizontally rotated stirrer with continuous air supply from it. It is clarified that highly reactive RHA can be obtained by incinerating rice husk under certain feeding rate and rotation speed. These RHA have higher specific surface area with less carbon as compared with those obtained by conventional furnaces.
