High Purity White Reactive Alpha Alumina Powder For Refractory Castables
Product Description:
HUAO Reactive Alumina is a premium alpha alumina powder designed to elevate the thermal and structural performance of advanced refractory systems. Engineered with high chemical purity and controlled grain sizing, it serves as a critical functional matrix in steel ladle castables, blast furnace iron runners, purging plugs, seating blocks, and corundum self-flowing castables.
By optimizing particle packing density and lowering liquid mixing demand, it enhances matrix fluidity and accelerates high-temperature solid-state sintering. The resulting dense microstructure yields exceptional mechanical strength, superior thermal shock resistance, and long-lasting protection against severe molten slag and iron erosion.
Technical Parameters:
| Features/Methods | Unit | HA250 Typical | HA250 Min | HA250 Max |
| Na₂O | % | 0.10 | 0.14 | |
| Fe₂O₃ | % | 0.03 | 0.04 | |
| MgO | % | 0.01 | ||
| SiO₂ | % | 0.03 | 0.07 | |
| CaO | % | 0.02 | ||
| Surface area/BET | m²/g | 3.0 | 2.6 | 3.4 |
| D50 Cilas | μm | 2.5 | 1.8 | 3.0 |
| D90 Cilas | μm | 7.0 | 5.0 | 10.0 |
| Particle distribution | doublet |
Applications:
HUAO Reactive Alumina is an ultra-fine alpha alumina micro-powder engineered for high-performance refractory systems and technical ceramics. Characterized by high purity and controlled impurity levels (Na2O <0.14%, Fe2O3 <0.04%), it acts as an essential matrix filler in steel ladle castables, blast furnace iron runners, purging plugs, and corundum self-flowing castables.
By filling interparticle voids and reducing mixing water requirements, it improves slurry fluidity and accelerates high-temperature solid-state sintering. The resulting dense microstructure provides superior mechanical strength, excellent thermal shock resistance, and robust protection against molten slag erosion. Flexible packaging and customizable sizes are available.
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Customization:
HUAO provides tailored Reactive Alumina micro-powder solutions for high-performance refractory applications, including steel ladle castables, iron ditch castables, porous purging plugs, seating blocks, and spray coatings.
Featuring high chemical purity, pristine white appearance, and low impurity levels (Na2O <0.14%, CaO <0.04%), our reactive alumina optimizes matrix density, reduces mixing water demand, and boosts high-temperature strength and slag resistance.
We offer fully customizable particle sizes alongside versatile packaging options, including 25kg bags, 1250kg big bags, or moisture-proof Jumbo bags. Orders are securely palletized and shipped via sea or air freight, supported by flexible T/T payment terms.
FAQ:
Q1: What are the main refractory applications for HUAO Reactive Alumina?
A1: HUAO Reactive Alumina is primarily used as a high-performance matrix filler in steel ladle castables, blast furnace iron runners, porous purging plugs, seating blocks, corundum self-flowing castables, and refractory spray coatings.
Q2: How does HUAO Reactive Alumina improve the quality of refractory castables?
A2: Its fine, controlled particle size fills micro-voids between larger grains, which significantly lowers mixing water demand, improves slurry fluidity, and promotes solid-state sintering during firing. This results in higher mechanical strength, better thermal shock resistance, and enhanced molten slag erosion resistance.
Q3: What packaging options, shelf life, and storage conditions are available?
A3: We supply 25kg paper/PE bags, 1250kg big bags, or moisture-proof Jumbo (BB) bags with custom palletization. The shelf life is 2 years when stored in a cool, dry, unopened package to prevent moisture absorption and agglomeration.
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