Introduction of anti-spalling high alumina brick
Anti-spalling high aluminum brick is in high aluminum brick with high bauxite expansion coefficient is inconsistent with the raw material, the use of complex phase toughening principle to produce micro-cracks in the structure of the product, alleviate or block the damage caused by thermal stress, so as to improve the thermal shock stability of the product, strengthen the high temperature and chemical corrosion resistance, the service life is more than 3 times the traditional high aluminum brick.
Anti-spalling high alumina brick is based on high alumina clinker, adding ZrO2 (zirconia) or other materials with anti-spalling properties of high alumina brick. The production process of anti-spalling high alumina brick is more complex, the production is roughly divided into four stages: preparation of the required raw materials ----- extrusion molding ------ high temperature forging ------ cooling packaging.
Second, anti-spalling high aluminum brick characteristics
1, anti-spalling high alumina brick high temperature volume stability,
2, the product load softening temperature is high, the volume does not shrink
3, anti-spalling high aluminum brick has excellent heat resistance
4, anti-spalling high aluminum brick wear resistance, and does not produce structural spalling
5, high resistance to chemical erosion, no cracking
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Model
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GKBL-70
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KBL-70
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Al2O3(%)
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≥70
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≥70
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ZrO2(%)
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≥6
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Fe2O3(%)
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≤1.5
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≤1.5
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Bulk density(g/cm³)
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≥2.55
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≥2.55
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Apparent porosity(%)
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≤22
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≤20
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Compressive strength(Mpa)
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≥60
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≥60
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Load softening start temperature(℃)
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≥1470
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≥1470
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Thermal shock stability, times [1100℃, water cooling]
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≥20
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≥15
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Third, anti-spalling high aluminum brick applications
High aluminum brick has strong resistance to falling off, high fire resistance, good cracking resistance and corrosion resistance, but also has resistance to potassium, sodium, sulfur, chlorine and alkaline salt corrosion, low thermal conductivity and other properties, is the ideal material for cement kiln transition zone and decomposition zone, can also be used in cement kiln door cover, cooling machine and other parts. For now, high alumina bricks are mainly used in cement kilns.
