Secondary high alumina bricks are refractory materials made of high alumina bauxite as the main raw material, with the main component being alumina (Al₂O₃) with a content of not less than 65%.
They are made by using different grades of bauxite clinker and formula binder, and then formed and fired at high temperature.
Secondary high alumina bricks have good refractory properties and corrosion resistance, Mainly used in high-temperature industrial equipment, such as: steel industry, non-ferrous metal industry, building materials industry, energy and incineration industry.
(1) High refractoriness
(2) High refractoriness under load
(3) Strong slag resistance
(4) High compressive strength
(5) Good stability
(6) Good wear resistance
(1) Iron and steel manufacturing industry: blast furnace, hot blast furnace, electric furnace, ladle, tundish, heating furnace, refining furnace, heating furnace, annealing furnace, cupola
(2) Nonferrous metal industry: smelting furnace, refining furnace, reverberatory furnace, converter furnace.
(3) Building materials industry: cement kiln, glass kiln, ceramic kiln, lime kiln, kiln car, tunnel kiln
(4) Energy and incineration: coke oven, circulating fluidized bed boiler, carbon roaster, incinerator.
|
Item |
Index |
||||
|
Model |
SK35 |
SK36 |
SK37 |
SK38 |
SK39 |
|
Al2O3/% |
≥48 |
≥55 |
≥65 |
≥75 |
≥80 |
|
Fe2O3/% |
≤2 |
≤2 |
≤2 |
≤2 |
≤2 |
|
Body density（g/cm3） |
2.15 |
2.2 |
2.3 |
2.4 |
2.5 |
|
Refractory |
≥1750 °C |
≥1770 °C |
≥1790 °C |
≥1790 °C |
≥1790 °C |
|
Change in heating permanent line/% |
1450℃×2h -0.4~0.1 |
1450℃×2h -0.4~0.1 |
1450℃×2h -0.4~0.1 |
1500℃×2h -0.4~0.2 |
1500℃×2h -0.4~0.2 |
|
Cold pressing strength |
≥39Mpa |
≥44Mpa |
≥49Mpa |
≥54Mpa |
≥65Mpa |
|
Apparent porosity (≤) |
≤22% |
≤22% |
≤23% |
≤23% |
≤21% |
|
Load softening temperature [0.2MPa*0.6%]≥ |
≥1420 °C |
≥1470 °C |
≥1500 °C |
≥1520 °C |
≥1530 °C |
（1）By Al₂O₃ content: LZ-55 (≥55%, for hot blast stoves), LZ-75 (≥75%, for electric furnace tops), LZ-82 (≥82%, for blast furnace ceramic cups).
（2）Functional types: High-alumina checker bricks (heat exchange for hot blast stoves), phosphate-impregnated high-alumina bricks (wear-resistant for waste incinerators), and custom special-shaped bricks (molds ready in 3 days for small batches).
（1）High temperature resistance: Refractoriness up to 1790℃, withstanding long-term use at 1200-1600℃.
（2）Precision & durability: CNC pressing (±1mm tolerance) + tunnel kiln sintering (20% energy saving via waste heat recovery), cold crushing strength ≥50MPa.
（3）Cost-efficiency: 95%+ waste recycling rate, raw material localized procurement (30% lower cost than imports).
（1）Steel industry: Blast furnace linings (cooperated with a Hebei steel mill, service life extended to 3 years, 6 months longer than peers).
（2）Cement industry: Kiln transition zones (resists thermal shock, ≥30 cycles at 1100℃).
（3）Glass industry: Glass furnace regenerators (LZ-82 bricks withstand 1790℃, reducing shutdowns).
| Aspect | High Alumina Bricks (Highland) | Insulation Bricks |
|---|---|---|
| Core function | High-temperature resistance + load-bearing | Only heat insulation (non-load-bearing) |
| Long-term temp resistance | 1200-1600℃ | ≤1200℃ |
| Bulk density | 2.15-2.5 g/cm³ | 0.6-1.3 g/cm³ |
| Application scenario | Kiln core parts (e.g., furnace linings) | Furnace insulation layers |
（1）Strength: 30-year experience, 2 production bases, annual output of 30,000 tons of high alumina bricks.
（2）Quality: ISO 9001/CE certified, 3-level quality control (raw material → small-batch test → full inspection).
（3）Service: 15-day delivery for custom orders, 24/7 video technical support for overseas clients.
（1）Performance: SiC content ≥85%, refractoriness up to 1900℃, 10x higher thermal conductivity than ordinary bricks.
（2）Synergy: Co-shipment with high alumina bricks (saves 30% freight).
（3）Customization: Molds for special-shaped silicon carbide bricks ready in 5 days, Suitable for ladle slag lines and petrochemical reactors.
With 30+ years in the refractory industry, Highland Refractory is a leading high alumina bricks manufacturer delivering tailored solutions for steel, cement, and glass industries. We specialize in high alumina bricks, AZS bricks, and unshaped monolithic refractories—backed by 3-7 days fast delivery and custom service to match your exact high-temperature needs.
For exports: Use EU-standard fumigated wooden crates + pearl cotton; for domestic sales: Use steel strip binding/lamination. Transport damage rate ≤ 0.8%, and a logistics tracking number will be provided.
Shaped high alumina bricks come with a 3-year warranty; free replacement for quality issues within the warranty period. Half-price inspection is available after the warranty expires.
We hold ISO 9001 and CE certifications (compliant with multiple domestic and international standards). Each batch undergoes three-level quality control (raw material inspection → small-batch testing → full inspection), and detailed test reports are provided.
Yes. We have a 2,300㎡ R&D center (cooperating with Luoyang Refractory Research Institute and Zhengzhou University). We can adjust raw material ratios (e.g., adding silicon carbide for high-temperature scenarios) and customize special-shaped bricks.
High alumina poly light brick is a high quality lightweight refractory material.
