Refractory articles for use in the metallurgical industry, namely, ceramic shapes for use in refractory furnaces, refractory blocks not of metal, refractory cones not of metal, refractory molds not of metal, refractory mortars, refractory filters not of metal, refractory bricks not of metal, refractory boards not of metal, refractory sheets not of metal, refractory slabs not of metal, refractory castable mixes not of metal, refractory gaskets not of metal, and refractory shapes not of metal