METHOD FOR MANUFACTURING GLAZE

PROBLEM TO BE SOLVED: To provide a technique capable of easily performing production (purification and levigation) of a glaze raw material for pottery in a short time, whereas incineration ash of plants (pruned branches and leaves, trees, etc.) is used as the glaze raw material for pottery through a purification (production) step called levigation (removal of lye, removal of alkali components) and granularity adjustment, and this step generally requires a long time since operations of suspending the incineration ash in water, disposing the supernatant after settling the ash and adding new water are repeated.SOLUTION: Carbonation and neutralization reactions of calcium oxide in incineration ash are promoted by performing blowing (bubbling) of carbon dioxide gas to a water suspension of incineration ash. Concretely, the incineration ash is suspended in water, and passed through a sieve of rough mesh (about 20 grades). Blowing of carbon dioxide is performed thereto, and the resulting suspension is left for one night. The supernatant is disposed, and the resulting suspension is passed through a sieve of finer mesh (about 40 grades) while adding new water thereto, and subjected to second blowing of carbon dioxide, and further left for one night. The supernatant is disposed, and the resulting suspension is filtered and dried, whereby ash as the glaze raw material for pottery is obtained.