Periclase-spinel products based on sintered materials for vacuum treatment of steel outside the furnace

Abstract

The linings of equipment for out-of-furnace vacuum treatment of steel, of the circulation, batching, and jet types, in Soviet enterprises, are made of periclass-chromite refractories PKhP, as specified by TU-14-8-368-81; these are made of fired periclase-chromite and periclase, the proportions of which in the batch are approximately 87% [1-4]. Obtaining fused materials is connected with considerable energy expenditure.Satisfying the increasing demands for these refractories in the out-of-furnace treatment of steel at present is being held up mainly by the lack of capacity for electric melting of magnesia and chromiumcontaining materials.Reducing the proportion of fused materials in the production of refractories for vacuum treatment of steel is an important problem.One approach is the use of differentiated linings for the vacuum units, using refractories made of sintered materials in the less demanding sections, e.g. in the walls.