Nile For Refractories increases its Investments and its Mineral Resources
Mortar 70% Al₂O₃
Heat -set mortars are produced and applied as dry mixes of fireclay (≤ 45% Al₂O₃), Aluminous fireclay (≤ 65% Al₂O₃) and high alumina (≤ 80% Al₂O₃) types. It is composed of fine calcined kaolin, bauxite and alumina grains, bonded by an extra ingredient to develop a ceramic bond by vitrification at temperatures lower than 1000 °C.
Heat -set mortars show high refractoriness,volume stability as well as resistance to chemical attack by the gaseous and liquid materials in contact with them under service conditions.
| Chemical Composition (wt) | Mortar 70% Al₂O₃ | |
| SiO₂ | 20.0 – 24.0 | % |
| Al₂O₃ | 68.0 – 72.0 | % |
| TiO₂ | 2.4 – 2.6 | % |
| Fe₂O₃ | ≤ 1.6 | % |
| CaO | ≤ 0.25 | % |
| MgO | ≤ 0.10 | % |
| Na₂O + K₂O | ≤ 0.4 | % |
| L.O.I | 3.0 – 3.4 | % |
| Physical and Thermo-Mechanical Proporities | Mortar 70% Al₂O₃ | |
| Max. Service temp, | 1700 | °C |
| Refractoriness, | > 1800 | °C |
| From | Dry | |
| Type of Setting | Heat – Setting | |
| Type of bond | Ceramic | |
| Grain size, (mm), over 0.3 mm 0.075 – 0.3 mm under 0.075 mm |
< 2 < 28 > 70 |
% |
| Water required, | 20 – 23 | % |
