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Xiaoyi City Jingang Refractory Materials Co., Ltd. was established in 2019. It is a provincial-level specialized, refined, distinctive, and innovative enterprise, a national high-tech enterprise, an innovative small and medium-sized enterprise, and a municipal technology center.
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- Commodity name: Homogenized mullite
Natural sintered mullite is produced from high‑quality natural bauxite, which undergoes manual sorting and is then sintered at temperatures exceeding 1,750°C. Mullite exhibits excellent thermal shock resistance, low high‑temperature creep, and superior chemical corrosion resistance, ensuring consistent quality. It is an ideal raw material for manufacturing a wide range of shaped and unshaped refractory products, high‑grade sanitary ware bodies, precision castings, and other applications.
Refractory Raw Materials · Technical ManualHomogenization Mullite
Mullite homogenized material — a bauxite-based mullite clinker produced through multi‑stage, full‑process homogenization blending followed by high‑temperature, thorough mullitization sintering. It exhibits zero variation in composition, crystalline phase, and density, making it a high‑end, stable sintered mullite.
3Al₂O₃ · 2SiO₂ | Al₂O₃/SiO₂ ≈ 3:2 Sintering at 1730–1780°C01Define the core
Common natural sintered mulliteThe raw material mix is only rudimentary, resulting in significant compositional fluctuations, a low mullite conversion rate, localized impurity accumulation, and an elevated glassy phase content.Mullite homogenate (mullite homogeneous material)On the basis of ordinary sintered mullite, an additional… is added. Wet ultrafine co-grinding, multi-stage silo homogenization, and precise batching to control the aluminum-to-silicon ratio. The raw materials consist of a precise blend of high-alumina bauxite and kaolin/cordierite, with the Al₂O₃/SiO₂ ratio tightly controlled to closely match the theoretical 3:2 ratio. 1730~1780°C solid-phase sintering , with a higher mullite conversion rate, uniform impurity distribution, and zero compositional variation across the entire batch.02Production Process Flow
Raw ore classification and impurity removal →Crushing and iron removal →Precise metering and batching →Wet ultrafine co-grinding →Filter pressing / Spray granulation →Multistage silo homogenization →High-pressure molding →Drying →Sintering at 1750°C →Crushing and Screening →Aggregate / Fine Powder Product03Physical and Chemical Specifications of Mainstream Grades
Grade Al₂O₃ SiO₂ Fe₂O₃ ≤ TiO₂ ≤ Alkali metal R₂O ≤ Bulk density ≥ Mullite phase Apparent porosity Homogenization M60 59~63% 34~38% 0.6% 0.35% 0.20% 2.70 g/cm³ 82%+ ≤ 13% Homogenization M70 69~73% 23~27% 0.5% 0.30% 0.15% 2.85 g/cm³ 90%~95% ≤ 10% Key features: Low iron and low alkali, few glass phases, and an interwoven network structure of acicular mullite. , with no locally enriched titanium- and iron-rich low-melting-point regions.
04Core Advantages (Compared with Conventional Sintered Mullite)
01Extremely stable formulationThe deviation of each batch and each bag is extremely small, eliminating the need for frequent adjustments to downstream formulations. The dimensional consistency and high‑temperature performance of refractory products are significantly improved, while the scrap rate is reduced. By contrast, ordinary sintered mullite from the same batch can exhibit an aluminum content variation of 2–3%.
02More complete mullitization and lower creep.After homogenization and thorough mixing, the aluminosilicate reaction is complete, resulting in a mullite phase content that is 10%–20% higher. At 1600°C, it exhibits extremely low long-term creep under load, with a load‑bearing softening point of ≥1650°C, making it well suited for prolonged high‑temperature kiln service.
03Comprehensive upgrade in thermal shock resistanceIt exhibits a uniform and stable coefficient of thermal expansion (5.0–5.4 × 10⁻⁶/°C), with no microcracks caused by compositional segregation; consequently, the risk of spalling or cracking under rapid cooling and heating is significantly lower than that of conventional sintered mullite.
04Acid- and alkali-resistant slag balanceIt contains no localized high-titanium, low-melting zones; it is resistant to acidic glass and ceramic melts, and, with a small amount of corundum, exhibits superior resistance to erosion by mildly alkaline steel slag compared with conventional sintered mullite.
05Higher density and lower water absorptionWet‑process homogenization combined with high‑pressure forming results in a greater density of closed pores, enhanced aggregate strength and wear resistance, and reduces the tendency for moisture absorption and delamination in castables.
05Shortboard Tip
Note 01Relatively high costThe manufacturing process is complex, the sintering temperature is high, and the price is higher than that of ordinary naturally sintered mullite.
Note 02Alkaline slag conditions are limited.The Al₂O₃ content is capped at around 73%, and the pure corundum content is significantly lower than that of the homogenized bauxite GL-85/88. Consequently, its performance under highly alkaline molten steel and iron‑tapping conditions is inferior to that of high‑alumina homogenized refractories.
06Horizontal classification of the three major raw materials
Basic LevelHomogenized bauxiteGL-83 / GL-88 · Al₂O₃ 83~88%Main crystalline phase: corundum is dominant, with minor mullite.Advantage- Excellent alkali-resistant steel slag
- Wear-resistant, with extremely high density.
- Great value for money
Disadvantage- Thermal shock generally
- High-temperature creep is significant.
- Poor acid resistance and slag resistance
Applicable: Ladle, taphole, cement kiln firing zone, metallurgical wear-resistant liningMid-rangeOrdinary sintered mulliteM70 · Al₂O₃ 69~73%Main crystalline phase: mullite 70–82%, with a relatively high glassy phase.Advantage- Moderate pricing
- Basic thermal shock resistance
Disadvantage- Significant ingredient variability
- The mullite conversion rate is relatively low.
- Localized impurity concentration
Applicable: Low-end kiln furniture, standard hot-blast stoves, low-cost castablesHigh-end levelHomogenized mulliteHomogenized M70 · Al₂O₃ 69–73%Main crystalline phase: mullite 90%+, trace corundum, and a low glassy phase.Advantage- Extremely stable formulation
- Ultra-low creep
- Top-tier thermal shock resistance
- Acid-alkali slag balance
Disadvantage- The price is on the high side.
Applicable: Glass furnace, large hot blast stove, transition zone of cement kiln, precision kiln furniture, high-end tundish refractory castables07Main application scenarios
Shaped refractory products- Silica-mullite wear-resistant bricks, mullite heat-storage bricks, glass furnace tank wall bricks, ceramic roller‑kiln pusher plates and kiln shelves, and checker bricks for hot blast stoves.
Unshaped refractory materials Core Use- Thermal-shock-resistant castables for the transition zone of cement kilns, linings for heat-treatment furnaces, and linings for tundishes in continuous casting.
- Low-creep ramming mass, kiln‑mouth wear‑resistant and spall‑resistant material
Precision casting- High-end refractory powder for casting surface coatings, ensuring smooth castings that resist sand adhesion and are free of porosity defects.
Special Ceramics and Thermal Insulation- Electrical porcelain, high-temperature ceramic substrates, and composite lightweight mullite insulating aggregates
08Supply Specification
Aggregate particle size0-1 mm · 1-3 mm
3-5 mm · 5-8 mmFine powder mesh count200 mesh · 325 mesh
400 mesh · 800 meshPackaging method25 kg woven bag
1-ton bulk bagStorage RequirementsMoisture-proof storage
Avoid mixing with high-alumina bauxite.
Homogenized mullite
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Mullite
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General Manager Su Tinglong
Sales Department, Qin Shuhua
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General Manager Su Tinglong
Sales Department, Qin Shuhua
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Nanyuyuan Village, Xiabao Town, Xiaoyi City, Lüliang Prefecture, Shanxi Province
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