Patent ID: 7459409
Filing Date: 2008-12-02
Classification: C04B

Abstract:
1. Unshaped refractories consisting essentially of: fine particles having a diameter less than 0.75mm; and, aggregate mixed into the fine particles having a diameter between 0.75mm and 10mm; wherein the fine particles have MgO content between 10 mass % and 35 mass % of the entire amount of the fine particles, wherein the fine particles have Al wherein the fine particles consist essentially of particles made of 0.5-10 mass % of alumina cement based on the total mass of the unshared refractories and periclase-spinel as a mineral-phase in a raw material used as a source of MgO containing 40-8 0 mass % of MgO and the main remainder of Al wherein the aggregate consists essentially of at least one particle selected from the group consisting of alumina and spinel.