CASTABLE REFRACTORY POWDER COMPOSITION, PREMIXED MATERIAL PREPARED THEREFROM, METHOD FOR CASTING PREMIXED MATERIAL, AND HARDENED REFRACTORY BODY OBTAINED THEREFROM

摘要

A powder composition for a castable refractory comprising a refractory aggregate, a refractory fine powder, an alumina cement, a dispersant, and a hydration terminating agent for the alumina cement; a premixed material prepared by kneading the powder composition for a castable refractory togeth er with water, wherein the hydration terminating agent comprises a substance exhibiting acidity in the form of a solution and is added in an amount adjusted so as for the premixed material to have a pH of 2 to 7; a method fo r applying the premixed material, which comprises kneading the premixed materi al together with a hydration initiating agent and then pouring the resulting mixture into a mold. The period from the preparation of the premixed materia l to the addition of the hydration initiating agent may be at least five days.