Special Refractory Ramming Mass

Model
Material Andalusite Mullite Magnesite Chrome Alumina-Magnesite Alumina-Zirconium
Type GHD GMD MCD AMD AZD
Chemical composition (%) Al2O3 50 70 � 80 90
SiO2 35 20 4 � �
MgO � � 85 12 �
Fe2O3 0.3 0.3 0.5 0.3 ZrO23
Cold crushing strength (MPa) 1250��3h
After firing at 15 12 15 20 18
Principal crystalline phase 1250��3h
After firing at Mullite phase Mullite phase Spinel phase Spinel phase Corundum phase
Linear changing after burnt (%) 1250��3h
After firing at 0�+0.6 0�+0.5 0�+0.9 0�+0.8 0�+0.3
Bulk density (gcm3) 1250��3h
After firing at 2.8 2.7 2.7 2.7 3.0
Refractoriness� (�� 1750 1750 1790 1700 1810
Refractoriness under load (�� 1550 1580 1600 1650 1680
Amount for construction (kgm3) 3000 2900 2900 2900 3150
Applied Metal Green, purple. Brass and copper alloy Cupronickel and higher metal iron and nickel alloys Special copper nickel, zirconium, Magnesium
Method of construction Jolt or ramming
Application Induction melting furnace for nonferrous metal and ferrous metal
Characteristic High load low wriggle; Thermal shock resistance; Ｈigh refractoriness; Corrosion resistance; Spalling resistance;
Volume stability High purity materials; Combined agent added
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