Lightweight, alkali-resistant castable
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Product Introduction
Lightweight alkali-resistant castable is a kind of hydraulic castable with alkali resistance prepared by adding an appropriate amount of additives with lightweight silicon-aluminum material as the main raw material, aluminate cement as the binding agent, and an appropriate amount of additives.
According to the performance index, the lightweight alkali-resistant castable is divided into two grades: QNJ-1 and QNJ-2, and its chemical composition is generally as follows: Al₂O₃ content is 30%~55%, and SiO₂ content is 25%~45%.
Lightweight alkali-resistant castables are mainly used as alkali-resistant heat-resistant insulation linings in the parts of the kiln that are eroded by alkali. For example, the preheater of the cement kiln pre-decomposition system, the decomposition furnace piping system and the ordinary dry rotary kiln preheat decomposition zone. The high-quality products are suitable for parts that have both heat insulation and alkali resistance requirements, as well as high strength and wear resistance requirements. It can also be used as a heat-resistant and heat-insulating lining for various industrial kilns without alkali erosion.
Due to its light weight characteristics, lightweight alkali-resistant castables are suitable for occasions that need to reduce structural loads, such as furnace tops, furnace walls, etc., and can also provide good thermal insulation and corrosion resistance.
| Projects | Physical and chemical indicators | ||
| QNJ-1 | QNJ-2 | ||
| Alkali resistance (not less than) | Level 2 | Level 2 | |
| Bulk density/(g/cm3) | ≤ | 1.90 | 1.70 |
Compressive strength at room temperature/Mpa ≥ | 110°C×24h after drying | 40 | 30 |
| 1000°C×3h after burning | 35 | 25 | |
Flexural strength at room temperature/Mpa ≥ | 110°C×24h after drying | 4.0 | 3.0 |
| 1000°C×3h after burning | 3.5 | 2.5 | |
| Permanent line change of heating (1000°C× after 3h burning)/% | ±1.0 | ±1.0 | |
| Thermal conductivity (average 350°C)/[W/(m. K）] | ≤ | 0.6 | 0.5 |
Key words:
Lightweight, alkali-resistant castable
Alkali-resistant castables
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