| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that an amorphous phase is apt to be generated when a fired product containing anorthite is obtained by using coal ash as a main component.SOLUTION: Such a raw material is used that the ignition residue thereof, after an ignition test is conducted at 950°C, contains 10-25 mass% of CaO, 10-30 mass% of AlO, 40-65 mass% of SiO, and 2-7 mass% of MgO. The raw material is fired at 1,000-1,400°C so that the fired product is obtained, which product contains 20-70 mass% of anorthite, 10-50 mass% of the total of augite, diopside, and hedenbergite, and 20 mass% or smaller of the amorphous phase. |
