Production method for magnesia-carbon brick

Abstract

The present invention provides a magnesia-carbon brick having excellent spalling resistance even though it contains graphite at a low rate, and having excellent corrosion resistance. In the present invention, the magnesia-carbon brick production method comprises: adding, as a binder, pitch/tar which is pitch, diluted pitch obtained by diluting pitch with a solvent, tar, or diluted tar obtained by diluting tar with a solvent, to a refractory raw material blend containing magnesia at a rate of 85% by mass or more, and containing graphite at a rate of 12% by mass or less (including 0); and subjecting the resulting mixture to kneading under a warm condition and then to molding under a warm condition, wherein the particle size composition of the magnesia in the refractory raw material blend is set such that the mass ratio of magnesia having a particle size of 1 mm or more to magnesia having a particle size of 0.075 mm to less than 1 mm is 0.2 to 1.5, and the mass ratio of the magnesia having a particle size of 1 mm or more to magnesia having a particle size of less than 0.075 mm is 3.0 or more.

Dependencies are inferred from the claim text.