Expansion agent for ceramic material, consisting of mixtures of wastes from aluminium production.

摘要

Expansion agent consisting of a mixture of wastes including: a) fine powders obtained by the grinding of foams from smelting furnaces of primary and/or secondary aluminium b) residue essentially consisting of saline slags from secondary aluminium production. The aforesaid agent when added to a ceramic material causes its expansion when the material is heated to its softening temperature. After calcination, the thus obtained ceramic material is practically water-tight and highly resistant both to the attack by chemical agents and to mechanical stresses.