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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

Inactive Publication Date: 2007-01-24
上海彭浦特种耐火材料厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, only magnesia fine powder is added to the aluminum-magnesium castable. Under the action of high temperature, the reaction of aluminum-magnesium expansion is fast. In the early stage of ladle lining use, the reaction has been completed, and shrinkage in the later stage is easy to cause cracks. peeling off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Ladle castable content Al 2 o 3 The mass percentage is 70.5, and MgO is 10.8. The specific ratio 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%. First weigh according to the above ratio, then pre-mix the three additives with some components of ≤1mm, and then mix them with other granules for use.

Embodiment 2

[0040] Provide ladle castable Al 2 o 3 The mass percentage is 74.8, MgO13.60. The particle gradation ratio is 20-10mm alumina 10%, 10-5mm alumina 12%, 5-3mm alumina 18%, 3-1mm alumina 15%, 1mm-75μm alumina 5%, ≤75μm alumina 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 micropowder (≤5μm) 2%, sodium tripolyphosphate 0.2%. After weighing according to the formula, the three kinds of additives are premixed with some components of ≤1mm, and then mixed with other granules for use.

[0041] project

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Abstract

The present invention provides an improved type alumina base medium and small ladle pouring material and its preparation method. It is characterized by that it is prepared by using electrofused magnesium sand and sintered magnesium sand through the process of continuous granule-grade preparation, in is matrix a brown corundum micropowder is added, so that the aluminium-magnesium spinel phase is produced at high temperature, and the ratio of silicon dioxide micropowder and magnesium sand fine powder can be reasonably controlled so as to make the alumina base have good low-temperature, medium temperature and high-temperature strength.

Description

technical field [0001] The invention relates to an improved bauxite-based ladle castable with improved components and its preparation method, in particular to a long-life bauxite-based small and medium-sized ladle castable prepared by continuous particle gradation of fused magnesia and sintered magnesia and Preparation method. It belongs to the field of refractory materials. Background technique [0002] Alumina-based aluminum-magnesium castables have excellent performance, and have achieved good results when used in small and medium-sized ladles. The technical route of this type of material is to add MgO powder to the matrix of high-alumina materials so that they can be used at high temperatures. Form aluminum-magnesium spinel, spinel has a small thermal expansion coefficient and elastic modulus, the melting point is 2135 ° C, and produces volume expansion effect when formed, so that the material has high refractoriness and good slag resistance , Thermal shock stability. ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10C04B35/04C04B35/20
Inventor 何晓俊
Owner 上海彭浦特种耐火材料厂有限公司
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