Crucibles

up to approx. 1.5-t capacity are made of graphite clay or silicon carbide, and in the case of metal crucibles, of cast iron, cast steel, steel plate and plated steel plate. These crucibles are used in metal foundries for non-ferrous metals. Acidic crucibles with capacities of up to 13 t are made from SiO2 material. The crucibles are rapped in in special moulds with the addition of binding agents, and after being allowed to cool in air are dried in drying furnaces, or even pre-sintered so that they can be transported by road or rail. These crucibles are “fixed” with back-fill compound after being installed in the furnace, patched at the upper edge, and then sintered in the same way as a normally lined crucible. The work- ing life of such crucibles is comparable to that of conventionally lined crucibles.