Micro Silica Fume (Silica Fume)
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Micro silica fume is also called "silica fume". When we smelt silicon materials, a large amount of highly volatile SiO2 and Si gases are produced in the submerged electric furnace, which are quickly oxidized and precipitated with air after the gas is discharged. The whole process needs to be recycled with advanced scientific environmental protection equipment. The collected silica fume is lighter than 200kg/m3, which is not easy to transport and use. Therefore, we reprocess it through densification, classification, selection, purification and other processes Afterwards, it can meet YB/T115-2004, GB/T176-2008, GB/T 21236-2007, ASTM C1240-03 and other standards.
The micro-silica fume can fill the pores between cement particles, and at the same time form a gel with the hydration product, and react with the alkaline material magnesium oxide to form a gel. In the cement-based concrete, mortar and refractory castables, mix an appropriate amount of silica fume:
1. Significantly improve compressive resistance, flexural resistance, impermeability, corrosion resistance, impact resistance and wear resistance.
2. It has the functions of retaining water, preventing segregation and bleeding, and greatly reducing the resistance of concrete pumping.
3. Significantly prolong the service life of concrete. Especially in harsh environments such as chloride pollution erosion, sulfate erosion, and high humidity, the durability of concrete can be doubled or even several times higher.
4. Significantly reduce the floor dust of sprayed concrete and castables, and increase the thickness of a single spray layer.
5. It is a necessary component of high-strength concrete, and C150 concrete has been used in engineering.
6. It has about 5 times the effect of cement. It can reduce costs and improve durability when used in ordinary concrete and low cement castables.
7. Effectively prevent the occurrence of concrete alkali aggregate reaction.
8. Improve the compactness of castable refractories. When coexisting with Al2O3, it is easier to form mullite phase, which increases its high temperature strength and thermal shock resistance.
Silica fume:
Appearance: gray or off-white powder
Refractoriness:>1600℃
Bulk density: 200~250 kg/cubic meter.
Item: SiO2 Al2O3 Fe2O3 MgO CaO NaO PH
Average: 75~96% 1.0±0.2% 0.9±0.3% 0.7±0.1% 0.3±0.1% 1.3±0.2% neutral
The fineness of silica fume: more than 80% of the silica fume has a fineness of less than 1 µm, with an average particle size of 0.1 to 0.3 µm, and a specific surface area of 20 to 28 m2/g. Its fineness and specific surface area are about 80-100 times that of cement and 50-70 times that of fly ash.
Particle morphology and mineral phase structure: During the formation process of silica fume, due to the effect of surface tension during the phase transition, amorphous spherical particles of amorphous phase are formed, and the surface is relatively smooth, and some are multiple spherical particles Agglomerates stuck together. It is a volcanic ash material with a large specific surface area and high activity. For materials mixed with silica fume, tiny spheres can play a lubricating effect.
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Micro Silica Fume (Silica Fume)
Micro silica fume is also called "silica fume". When we smelt silicon materials, a large amount of highly volatile SiO2 and Si gases are produced in the submerged electric furnace, which are quickly oxidized and precipitated with air after the gas is discharged.
Micro Silica Fume (Silica Fume)
Micro silica fume is also called "silica fume". When we smelt silicon materials, a large amount of highly volatile SiO2 and Si gases are produced in the submerged electric furnace, which are quickly oxidized and precipitated with air after the gas is discharged.
Micro Silica Fume (Silica Fume)
Micro silica fume is also called "silica fume". When we smelt silicon materials, a large amount of highly volatile SiO2 and Si gases are produced in the submerged electric furnace, which are quickly oxidized and precipitated with air after the gas is discharged.
Silicon Metal
"Metallic silicon" (also called industrial silicon in our country) is a trade name that appeared in the mid-1960s.
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Time of issue:2020-12-30 17:49:01
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