Patent ID: 8017058
Filing Date: 2011-09-13
Classification: C04B

Abstract:
1. A method for casting a premixed material comprising tempering a castable refractory powder composition comprising refractory aggregate, fine refractory powder, alumina cement, a dispersing agent and an alumina cement hydration stopper with water in advance to prepare said premixed material which can be stored with castable flowability for 5 days or more, adding an alumina cement hydration starter to said premixed material and mixing the alumina cement hydration starter and the premixed material immediately before casting, and then casting the resultant mixture into a mold at room temperature to harden said premixed material without external heat being applied to the mixture; wherein a material, which is acidic in a state of an aqueous solution, is used as said hydration stopper: wherein the amount of said hydration stopper is controlled such that said premixed material has a pH of 2 to 7; and wherein the amount of said hydration starter is 0.02 to 0.5% by mass (outer percentage), based on the total amount (100% by mass) of said refractory aggregate, said fine refractory powder and said alumina cement.