Refractory Materials Based on Secondary Resources and Phosphate Compounds

Resumo

Results are provided for refractory materials developed on basis of both secondary resources (broken chamotte refractory, mullite-containing waste, and aluminum melting slag), fireclay, and phosphoric acid. A relationship is established for physicochemical and strength properties of the materials on additive content, filler fractional composition, and also firing temperature. It is stablished that the optimum aluminum melting slag and mullite-containing waste contents are 5% and 15% respectively. The material produced with a firing temperature up to 1200°C has density of 1785 – 1795 kg/m³, open porosity of 20 – 23%, ultimate strength in compression of 40 – 50 MPa, and thermal shock resistance of 30 – 50 thermal cycles (1000°C – water).