Pусский
العربية
Amy Ai
Leave a message
Sintered magnesia alumina spinel (MgAl₂O₄) is a synthetic refractory raw material produced by high-temperature sintering of high-purity magnesite and industrial alumina. It features a well-developed spinel crystal structure, excellent thermal stability, low thermal expansion, and superior resistance to thermal shock and slag corrosion. Compared with fused spinel, sintered spinel offers better sintering activity and compatibility with matrix materials, making it ideal for high-performance refractory formulations.
High-purity phase composition with consistent MgO·Al₂O₃ spinel content
Excellent thermal shock resistance and low thermal conductivity
Low creep and high hot strength at elevated temperatures
Strong resistance to alkali and acidic slags
Stable volume expansion and minimal reactivity with other refractories
Global Industrial Applications
Sintered spinel is widely used in industries that require materials to withstand aggressive thermal and chemical conditions, including:
― Steel industry: Backfill material and aggregate in magnesia-alumina-carbon bricks, ladle linings, and slide gate plates
― Cement industry: Castables and precast blocks for transition and burning zones
― Non-ferrous metallurgy: Linings for furnaces exposed to corrosive slags (copper, aluminum, lead smelting)
― Petrochemical and incineration: Refractory linings in secondary combustion chambers and gasifiers
― Glass and ceramics: Protective linings for furnaces and kilns
Grain Size Distribution
Particle Type | Size Range | Equivalent Mesh | Application |
Coarse Grades | 5 – 1 mm | 4 – 18 mesh | refractory bricks, precast shapes |
Intermediate | 1 – 100 μm | 18 – 150 mesh | Unshaped refractories, ramming masses |
Fine Powders | 100 – 45 μm (D₅₀ adjustable) | 150 – 325 mesh | Low-cement castables, gunning materials |
Custom particle sizes available upon request. | |||
Standard packaging: 25kg bags or 1MT jumbo bags.
Custom packaging is available upon request.
ISO 9001:2015 , ISO 45001:2018, ISO 14001:2015 certified production
Conformity with international refractory standards for spinel aggregate
Full traceability from raw material to final delivery.
Item | Unit | JMA-78 | JMA-66 |
Al2O3 | % | ≥ 75 | ≥ 64 |
MgO | % | ≥ 20 | ≥ 32 |
CaO | % | ≤ 0.40 | ≤ 0.50 |
Na2O | % | ≤ 0.35 | ≤ 0.30 |
SiO2 | % | ≤ 0.30 | ≤ 0.35 |
Fe2O3 | % | ≤ 0.25 | ≤ 0.30 |
Bulk Density | g/cm3 | ≥ 3.20 | ≥ 3.20 |
Apparent Porosity | % | ≤ 3.00 | ≤ 3.00 |
Water Absorption | % | ≤ 1.00 | ≤ 1.00 |
Why Choose Our Spinel?
Our sintered magnesia alumina spinel combines high purity with stable crystal structure and optimized particle size distribution. It ensures excellent workability in refractory formulations, enhances product longevity, and minimizes maintenance cycles in harsh industrial environments.
Comment
（0）