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Silica fume
Silica fume
Silica fume
Silica fume
Silica fume
Silica fume
Micro silica powder is also known as silica fume or condensed silica fume, which is a large amount of highly volatile SiO2 and Si gas generated by ferroalloy in smelting ferrosilicon and industrial silicon (silicon metal).
Micro-silica powder will quickly generate gelatinous substances when it encounters water, so it can be used to fill the gaps between cement. Therefore, this powder is widely used in the building materials industry.
Product Introduction
What is the Silica fume / Micro Silica ?
Micro silica powder is also known as silica fume or condensed silica fume, which is a large amount of highly volatile SiO2 and Si gas generated by ferroalloy in smelting ferrosilicon and industrial silicon (silicon metal). After gas emission, it is rapidly oxidized, condensed and precipitated with air.
Micro-silicon powder is a kind of smoky gray ultrafine powder. With the amount of carbon content, the color changes slightly. Most of the silica fume particles are about 45um.This allows the micro silicon powder can be used in cement.Because the specific surface area of silica fume is very large, it has good pozzolanic activity and filling property.
How to produce Silica fume / Micro Silica ?
Step 1: Waste Gas Purification
The outlet flue gas of the electric furnace passes through the hood and main flue gas pipeline. After cooling by the cooler, it enters the cyclone separator, and then passes through the bag filter. The flue gas enters the bag filter through the fan, and the dust is trapped by the inner surface of the bag. After purification, the flue gas which meets the environmental protection standard is discharged from the bag and rises to the top of the filter and discharges into the atmosphere from the discharge port.

Step 2: Silicon Powder Collection
When the resistance or time of the equipment reaches the set value, the ash unloading process begins. By using the negative pressure of the front section of the main fan and switching between the back suction duct and the valve of the inlet and outlet ducts, the dust removal process of each chamber of the bag filter is realized. The recovered dust is sent to the silicon powder homogenization device by the fan through the ash conveying duct.

Step 3: micro silicon powder encryption
After a cloth bag dust collector to collect initial density of micro silicon powder is only 150-200 kg/m3, spend big on transportation fee to use, therefore, after the encrypted spherical micro silicon powder, the mass density by original bulk micro silicon powder is around 0.2 t/m3 rose to 0.3 ~ 0.6 t/m3, so can reduce packaging and shipping, about 30 ~ 60% at the same time, loading and unloading efficiency was improved and occupies less storage space, and dust phenomenon greatly slow down the production site, to improve the working conditions and environment.
The specification of Silica fume / Micro Silica
Analysis Object(%) Grade
SiO2(min.) 97 94 90 88 85
Ai2O3(Max.) 1 1 2 -- --
Fe2O3(Max.) 1 1 2 -- --
CaO+MgO(Max.) 1 1 2 -- --
K2O+Na2O(Max.) 1 1.5 2 -- --
C(Max.) 1 2 2 2.5 3
NaOH(Max.) 1 3 3 4 4.5
PH(Max.) 4.5-6.5 4.5-7.5 4.5-7.5 4.5-8.5 4.5-8.5
Size above 45um(Max.) 3 3 5 8 8
Moisture(Max.) 0.1% max    
M2/g(Max.) 1 2 2.5 3 3
Advantage:
Micro-silica powder will quickly generate gelatinous substances when it encounters water, so it can be used to fill the gaps between cement. Therefore, this powder is widely used in the building materials industry.
Micro silicon powder can be used as refractory casting materials, such as breathable bricks, ladles and some high temperature ceramics, in which we can add micro silicon powder, so that these materials can be very resistant to high temperature and convenient for processing.In addition, the density and strength of this material are very high, and the plasticity is very strong, so it is used in a wide range of industrial fields.
A new smelting material can be formed by the reaction of micro silica powder with water, followed by drying and firing under certain conditions, with very few impurities in the material.Of course, the powder can also be used as fertilizer and fire extinguishing agent.
Usage:
Micro silicon powder is extracted from the industrial production process and has a wide range of USES, which can be used in the construction industry, water conservancy, electrical engineering, civil engineering, highway construction, port bridge brine engineering and other fields.It includes the following industries:

1. Cement industry: after adding micro silicon powder in cement, the performance is improved and the quality label is greatly improved
2. Rubber industry: rubber with a certain amount of micro silicon powder, its extension and shrinkage, tear resistance and aging resistance have been greatly improved, this rubber also has a good dielectric, low water absorption capacity.
3. Anti-caking agent: substitute mica or diatomite as raw material to prevent the caking of fertilizer particles.
4. As the pellet adhesive: the micro silicon powder has large specific surface area and strong adsorbability, and it has achieved remarkable effect as the pellet mineral adhesive in foreign countries.
5. Sodium silicate industry: it can replace quartz mine to produce sodium silicate with modulus of 4.
6. Used as cementing in oil fields: jilin oil field, liaohe oil field, karamay oil field, etc., a large amount of micro silicon powder has been used, and good use effect has been achieved.
7. It is applied in insulation material, waterproof material, paint, coating, printing industry and so on.
Inquiry
Email:
Tel: +86 372 2958995
Fax: +86 372 2958995
Skype /Wechat: +86 155 1720 7844
Add: Qugou Town, Anyang County, Henan, China