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High-Quality Silica Brick for Industrial Furnaces - China Suppliers & Factory with 94% SiO₂ Content
Core Advantages
High Silicon Content & Premium Purity
SiO₂ content ranges from 94% to 96%, with extremely low harmful impurities (Fe₂O₃ ≤1.5%). The high purity ensures excellent refractory performance and minimizes pollution to molten materials such as glass liquid.
Exceptional High-Temperature Resistance
Load softening temperature reaches 1640-1680℃, close to the melting point of tridymite and cristobalite. It maintains structural integrity without deformation under long-term high-temperature and high-load conditions.
Strong Acid Corrosion Resistance
As an acidic refractory material, it offers superior resistance to acidic slag and gas erosion, outperforming ordinary clay and high-alumina bricks in aggressive acidic working environments.
Stable High-Temperature Volume
Engineered primarily with tridymite and cristobalite minerals. Small residual expansion (0-0.2% at 1450℃×2h) ensures tight masonry joints and dependable airtight integrity.
Excellent Thermal Conductivity
Higher thermal conductivity than clay and high-alumina alternatives promotes rapid heat storage and release in furnace systems, maximizing overall energy utilization efficiency.
Product Parameters
| Item | Silica Brick | |||
|---|---|---|---|---|
| BG-94 | BG-95 | BG-96A | BG-96B | |
| SiO₂ % | ≥94 | ≥95 | ≥96 | ≥96 |
| Fe₂O₃ % | ≤1.50 | ≤1.50 | ≤0.80 | ≤0.70 |
| Apparent Porosity % | ≤22 | ≤21 | ≤21 | ≤21 |
| True Density (g/cm³) | ≤2.38 | ≤2.38 | ≤2.34 | ≤2.34 |
| Cold Crushing Strength (MPa) | ≥25 | ≥29 | ≥35 | ≥35 |
| Refractoriness Under Load (℃, 0.2MPa, 0.6%) | ≥1630 | ≥1650 | ≥1680 | ≥1680 |
Detailed Application Scenarios
1. Coke Oven Application
Silica brick is the core refractory material for modern large-scale coke ovens, used in key parts such as regenerator walls, slopes, carbonization chamber bottoms, furnace walls, and furnace tops. Coke ovens operate continuously at 950-1050℃ for coal dry distillation. The high temperature resistance, stable volume, and superior thermal conductivity increase combustion chamber temperatures, shorten coking cycle times, elevate production capacity, and extend furnace service life to over 20 years. Perfectly suited for large coke ovens with carbonization chambers exceeding 6m in height.
2. Glass Furnace Application
Silica brick is the primary brick choice in float glass furnaces, specifically used for the melting section, working section roof crown, breast walls, front and rear end walls, regenerator top crowns, and upper partition walls. In working temperatures exceeding 1615℃, silica bricks withstand mechanical stress, gravity, and high load. Minor alkali vapor exposure creates a protective glaze without compromising structural integrity. Moreover, ultra-low iron impurity (Fe₂O₃ ≤0.8%) prevents glass discoloration and guarantees pristine product quality.
3. Hot Blast Furnace Application
Applied to high-temperature sections of blast furnace hot blast stoves. Under sustained high thermal conditions and intense air pressure, it exhibits minimal creep rate and exceptional volume stability, serving reliably across 1-2 entire blast furnace campaign generations. Its high thermal conductivity accelerates heat absorption and discharge, maximizing blast temperatures and thermal efficiency. Ideal for high-temperature load-bearing structural parts and acidic furnace roofs.
We provide customized services for different furnace types and working conditions to meet personalized project requirements. With an experienced technical R&D team and dedicated after-sales support, we ensure premium quality and dependable refractory performance.
Frequently Asked Questions (FAQ)
What are the primary chemical composition requirements for high-performance silica bricks?
High-grade silica bricks require a SiO₂ content between 94% and 96%, with tightly restricted Fe₂O₃ levels (typically below 0.70% to 1.50%) to ensure exceptional refractoriness and prevent molten contamination.
What is the typical refractoriness under load for silica refractories?
The refractoriness under load (0.2 MPa, 0.6% deformation) generally ranges from 1630℃ to over 1680℃, which is very close to its ultimate melting point, ensuring no structural sagging under high heat.
Why are silica bricks preferred for coke oven carbonization chambers?
Silica bricks offer outstanding thermal conductivity, volume stability without permanent shrinkage at working temperatures (950–1050℃), and exceptional mechanical strength, extending coke oven campaign life beyond 20 years.
How do silica bricks perform against acidic chemical attacks?
Being an acidic refractory material, silica bricks exhibit superior natural resistance to acidic slags, sulfur-bearing gases, and acidic flux components compared to neutral or basic refractories.
Can custom dimensions and specific shapes be manufactured for unique furnace geometries?
Yes, specialized shapes, crown arch bricks, and tailored dimensions can be engineered according to furnace design blueprints and specific operating parameters.
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