silica fume
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Silica fume production
What is silica fume
Silica fume, also known as microsilica, fumed silica. When smelting ferrosilicon and industrial silicon (metal silicon), a large amount of highly volatile SiO2 and Si gas is generated in the ore furnace. And the gas is rapidly oxidized after being discharged. Silica fume is formed after condensation and precipitation.
Microsilica
White silica fume
Microsilica is a by-product of large-scale industrial smelting. And the entire process needs to be recycled with dust-removing environmental protection equipment.
Silica fume properties
- Appearance: gray or off-white powder
- Refractoriness: >1600°C
- Bulk density: 200 ~ 250 kg / cubic meter.
- Chemical composition: SiO2
- Silica fume particle size: 80% or more of less than 1 μm, and an average particle diameter of 0.1-0.3 μm, which is a gray state.
Silica fume specification
| Analysis Object(%) | Brand | ||||
| 97# | 94# | 90# | 88# | 85# | |
| SiO2 | 97.0 | 94.0 | 90.0 | 88.0 | 85.0 |
|---|---|---|---|---|---|
| Al2O3 | 1.0 | 1.0 | 2.0 | ||
| Fe2O3 | 1.0 | 1.0 | 2.0 | ||
| CaO+MgO | 1.0 | 1.0 | 2.0 | ||
| K2O+Na2O | 1.0 | 1.5 | 2.0 | ||
| C | 1.0 | 2.0 | 2.0 | 2.5 | 3.0 |
| NaOH | 1.0 | 3.0 | 3.0 | 4.0 | 4.5 |
| PH | 4.5-6.5 | 4.5-7.5 | 4.5-7.5 | 4.5-8.5 | 4.5-8.5 |
| Sizeabove45um | 1.5 | 2.0 | 2.0 | 2.0 | 5.0 |
| Moisture | 1.5 | ||||
| M2/g | 1.0 | 2.0 | 2.5 | 3.0 | 3.0 |
Micro silica uses
Silica fume applications
1.Use of microsilica in concrete
The advantages of microsilica in concrete are very obvious. Fumed silica is capable of filling pores between cement particles. At the same time, a gel body is formed with the hydration product. It reacts with the alkaline material magnesia to form a gel.
- Improve the concrete's resistance to pressure and corrosion.
- At the same time, it has the function of preventing segregation and water retention.
2. As an additive to refractory materials. Micro silica can improve the compactness of cast refractories.
Silica fume market
In the infrastructure construction project, silica fume plays a big role. Such as high-rise buildings, seaports, reservoirs, highways, bridges, subways, airport runways, etc.
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