Silica bricks for coke ovens
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Product Introduction
Silica brick for coke oven is a siliceous refractory product with scale-quartz as the main crystalline phase, which is mainly used for masonry of various parts of coke oven, including regenerator wall, ramp, combustion chamber, carbonization chamber and furnace roof. Here are the details about silica bricks for coke ovens:
1. Definitions
Silica bricks for coke ovens refer to siliceous refractories used in coke ovens, and their main component is silicon dioxide (SiO2), usually with a content of more than 93%.
2. Classification
Silica bricks for coke ovens can be classified according to their chemical composition and physical properties, mainly including ordinary silica bricks and high thermal conductivity silica bricks.
3. Technical requirements
According to the GB/T 2068-2012 standard, the technical requirements for silica bricks for coke ovens include:
Alumina content: ≥ 94.5% (bottom of furnace), ≥ 94% (furnace wall)
Iron oxide content: ≤1.2% (bottom), ≤1.5% (wall)
Load softening temperature: ≥1650°C
Apparent porosity: ≤22% (bottom of furnace), ≤24% (wall)
Compressive strength at room temperature: ≥40MPa (bottom of furnace), ≥35MPa (wall)
True density: ≤ 2.33g/cm³ (bottom), ≤ 2.35g/cm³ (wall)
Thermal expansion rate: ≤ 1.28% (furnace bottom), ≤ 1.30% (furnace wall).
4. Shape and size
The shape and size of silica bricks for coke ovens should meet the relevant standards, usually standard bricks, and the specific size is determined according to the design and construction requirements.
5. Application
Silica bricks for coke ovens are widely used in various parts of coke ovens, especially in high-temperature and high-pressure environments, such as combustion chambers and carbonization chambers. Its excellent thermal conductivity and thermal shock resistance make it an important refractory material for coke ovens.
6. Standards
The relevant standards for silica bricks for coke ovens include GB/T 2068-2012 and YB/T 4168-2019, which stipulate the classification, technical requirements, test methods and other contents of silica bricks for coke ovens.
The quality of silica bricks for coke ovens directly affects the service life and production efficiency of coke ovens, so it is necessary to strictly follow the relevant standards and technical requirements when selecting and using them.
| Projects | Physical and chemical indicators | |||
| JG-94 | ||||
| Furnace Bottom (LD) | Furnace wall (LB) | Other Sites (QT) | ||
| （Si02）/% | ≥ | 94.5 | 94.0 | |
| （Al2O3）/% | ≤ | 1.2 | 1.5 | |
| （Fe2O3）/% | ≤ | 1.2 | 1.5 | |
| （CaO）/100% | ≤ | 3.0 | 3.0 | |
| （Na2O+K2O）/% | ≤ | 0.35 | 0.35 | |
| Apparent porosity/% | ≤ | 22 | 24 | |
| Compressive strength at room temperature/Mpa | ≥ | 40 | 35 | 28 |
| 0.2Mpa load softening starting temperature/°C | ≥ | 1650 | ||
| True density/(g/cm3) | ≤ | 2.33 | 2.34 | |
| Residual Quartz/% | ≤ | 1.5 | ||
| Permanent line change of heating (1600°C×3h)/% | Xmin~Xmax | 0~0.2 | ||
| Thermal expansion rate (1000°C)/% | ≤ | 1.28 | 1.30 | |
Key words:
Silica bricks for coke ovens
Silica bricks
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