METHOD FOR IMPROVING WHITENESS OF FLY ASH BALLOON, COATED FLY ASH BALLOON, AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a method for improving whiteness of fly ash balloons, and coated fly ash balloons with improved whiteness, and a method for producing the same.SOLUTION: An aqueous solution including fly ash balloons and a calcium source is heated under pressurization, so that a film comprising a calcium silicate hydrate is generally uniformly formed on the surface of the fly ash balloon, thereby improving the whiteness of the fly ash balloon.