Low carbon quality magnesia carbon brick

摘要

PPROBLEM TO BE SOLVED: To impart a strength and spalling resistance equivalent to a magnesia carbon brick containing a comparatively large amount of graphite, to a low carbon magnesia-containing fire-resistant unburned brick containing chromium, while preventing occurrence of a carbon pickup and maintaining superior corrosion resistance. PSOLUTION: The low carbonaceous magnesia carbon brick is obtained by adding an organic binder to a fire-resistant raw material mixture consisting of 90-99 mass% of a magnesia-based raw material, 0.5-5 mass% of a flake graphite, and 0.3-10 mass% of metal chromium and/or a chromium alloy; kneading; molding and heat-treating; and its fixed carbon content is 0.5-7 mass%. The magnesia-based raw material in the fire-resistant raw material mixture of this low carbon magnesia carbon brick is occupied by particles having particle sizes from larger than 10 μm to 500 μm by 20-50 mass%, and the amount of particles having a particle size of 10 μm or smaller is 5 mass% of the fire-resistant raw material mixture. PCOPYRIGHT: (C)2007,JPO&INPIT