Microsilica powder can form a dense protective layer, preventing the erosion medium (such as slag, molten steel, etc.) from penetrating into the interior of the castables, thus improving the erosion resistance of refractory materials.
Improved erosion resistance
- Microsilica powder can form a dense protective layer, preventing the erosion medium (such as slag, molten steel, etc.) from penetrating into the interior of the castables, thus improving the erosion resistance of refractory materials.
Second, the use of microsilica powder in the refractory castables formulations
The following is a typical refractory castable formula example, which contains microsilica powder:
Raw material composition:
- High-alumina bauxite aggregate: 40%-60%
- High-alumina bauxite fines: 15%-30
- Microsilica powder: 3% - 8%
- Cement binding agent: 5%-15
- Dispersing agent: 0.1%-0.5%
- Water: appropriate amount
Recipe Description:
- High alumina bauxite aggregate provides the main refractory properties and strength support.
- The fine powder of high alumina bauxite is used to fill the pores between the aggregates and improve the compactness of the castables.
- Microsilica powders are used in the formulation to improve flowability, strength, thermal shock resistance and erosion resistance.
- Cement binders provide binding strength and give the castables a certain strength after curing.
- Dispersants are used to improve the flowability of the castables and to prevent agglomeration of particles.
- The amount of water is adjusted according to the fluidity requirements of the castables, and is generally controlled at about 5%-8%.
It should be noted that the specific formula should be adjusted according to the use requirements of refractory materials, construction conditions and cost and other factors. In practical application, the optimal proportion of formula can be determined by test to obtain refractory castables with excellent performance.