| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition.SOLUTION: A method of making a mold has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed, to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less. |
