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Electrocast AZS (alumina-zirconium-silicate) refractory blocks for glass-melting furnaces
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AZS refractory blocks are manufactured by fusing of raw material completely into the mould, then it proceeds with further processes of cooling and burning. According to the content of ZrO2 there are following kinds of AZS: AZS-33, AZS-36, AZS-41, and by the casting method – with regular/normal (PT/RC/NC), oriented (TC/OC/QX), reduced cavity (ZWS/ENC/EC/RC), or without cavity – void free (WS/VF/FC).
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Electrically fused cast blocks AZS-33, AZS-36, AZS-41 are widely applied at stacking walls, the top structure of the furnace and the channel of a feeder.
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Chemical compound and physical parameters
| Name | Designation | Parameters |
| AZS 33 | AZS 36 | AZS 41 |
| Al2O3 | % | 51.2 | 49.3 | 45 |
| SiO2 ≤ | % | 14.5 | 13.5 | 13 |
| ZrO2 ≥ | % | 32 | 35 | 40 |
| Fe2O3, TiO2, CaO, MgO, Na2O, K2O, B2O3 ≤ | % | 2.3 | 2.2 | 2 |
| Poured density ≥ | g/cm3 | 3.75 | 3.85 | 3.90 |
| Seeming porosity ≤ | % | 1.5 | 1.5 | 1.5 |
| Limit of strength at compression at low temperatures ≥ | Mpa | 300 | 300 | 300 |
| Temperature of evaporation of glass mass ≥ | ºC | 1400 | 1400 | 1410 |
| Norm of oiling by splashing ≤ | % | 2.0 | 1.5 | 1.0 |
| Degree of resistance to corrosion of glass mass ≤ | % | 1.5 | 1.4 | 1.2 |
| Density ≥ | PT | g/cm3 | 3.40 | 3.50 | 3.65 |
| ZWS | 3.65 | 3.75 | 3.85 |
| WS | 3.70 | 3.85 | 3.90 |
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