Improved type casting material based on bauxite for middle-small type ladle and preparation method
An improved technology of ladle casting, which is applied in the field of refractory materials, can solve problems such as spalling, shrinkage and easy cracks, and achieve the effect of improving compressive strength and flexural strength
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[0037] Example 1
[0038] Ladle castable content Al 2 O 3 The mass percentage is 70.5, and MgO is 10.8. The specific proportion is 20-10mm bauxite 15%, 10-5mm bauxite 10%, 5-3mm bauxite 8%, 3-1mm bauxite 10%, 1mm-75μm bauxite 15%, ≤75μm bauxite 11.5% ; 4-2mm sintered magnesia 2%, 2-1mm sintered magnesia 2%, 1mm-75μm fused magnesia 2%, ≤75μm fused magnesia 4.8%, brown corundum powder 2.6%, silica powder 2.4% , Sodium tripolyphosphate 0.5%. Weigh according to the above ratio, and then premix the three additives with the components ≤1mm, then mix them with other particles, and set aside.
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[0039] Example 2
[0040] Provide ladle castable Al 2 O 3 The mass percentage is 74.8, MgO13.60. The particle grading ratio is 20-10mm bauxite 10%, 10-5mm bauxite 12%, 5-3mm bauxite 18%, 3-1mm bauxite 15%, 1mm-75μm bauxite 5%, ≤75μm bauxite 10%; 4-2mm sintered magnesia 3%, 2-1mm sintered magnesia 4%, 1mm-75μm fused magnesia 3%, ≤75μm fused magnesia 5%, ≤5μm brown corundum powder 2.2%, two Silica powder (≤5μm) 2%, sodium tripolyphosphate 0.2%. After weighing according to the formula, the three additives are premixed with the components ≤1mm and then mixed with other particles, and set aside.
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