Silica fume, also known as microsilica, is an amorphous (non-crystalline) polymorph of silicon dioxide, silica. It is an ultrafine powder collected as a by-product during silicon and ferrosilicon alloy production.
According to the SiO2 content, our products can arrange form grade 85% to grade 98%. According to the bulk density, we can divide our products into densified silica fume and undensified silica fume.
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We can supply densified/undensified microsilica/silica fume product
are with minimum SiO2 contents from 85% to 97%.
Packing:1000kg/jumbo bag or as customer required.
Attached our company profile and 92D microsilica Datasheets for your reference.
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Silica fume, also known as condensed silica fume or microsilica, is a spherical sub-micron amorphous silicon dioxide used in many applications.
Silica fume is a co-product of silicon or ferrosilicon production, consisting of ultrafine (sub-micron), amorphous, non-porous, perfectly spherical silicon dioxide (SiO2) particles, with purity levels of 85 to 99 %.
The main effect of these ultra-fine particles is to greatly improve particle packing and produce a highly pozzolanic reaction in concrete and other cementitious bond systems where the silicon dioxide reacts with calcium hydroxide, heightening performance levels and the strength and durability of these materials.
Additionally, silica fume, because of its amorphous (non-crystalline) structure and its specific area, provides other useful features to various applications, including improved sintering capabilities and enhanced high temperature performance of refractory castables, resulting in reactions between microsilica and other components of the refractory mix.
To summarize, silica fume has two key features which alone or in combination are the basis for its high performance:
The nano-sized spherical non-porous particles create an efficient "filler effect"
Primary particles have an average diameter of about 0.15 �¼m (150 nanometers)
Microsilica is a highly reactive form of silica producing a "chemical effect"
Thanks to its amorphous nature and high specific surface area.
ACC® Undensified Microsilica is a by-product of the production of ferrosilicon alloys or silicon metal, with SiO2 content ranging from 85% to 98%, bulk density around 300 - 400kg/m3, and light gray color. They are classified as Grade 85U, Grade 92U, Grade 94U,Grade 96U and Grade 98U. It is collected, and packed from our ferrosilicon or silicon metal factories directly, the automatic and integrated production process guarantees the consistent quality.
ACC® Undensified Microsilica is a by-product of the production of ferrosilicon alloys or silicon metal, with SiO2 content ranging from 85% to 98%, bulk density around 300 400kg/m3, and light gray color. They are classified as Grade 85U, Grade 92U, Grade 94U,Grade 96U and Grade 98U. It is collected, and packed from our ferrosilicon or silicon metal factories directly, the automatic and integrated production process guarantees the consistent quality.
Micro Silica also known as Silica fume. It is a by product of producing silicon metal or ferrosilicon alloys in smelter using electric arc furnaces. It is a grey coloured powder, pozzolanic in nature.
Applications
Concrete Industry
Refractory
Rubber Industry
Anti caking agent
Pellet Binder
Microsilica (silica fume) is a byproduct from silicon metal or ferrosilicon industries,is an amorphous silicon dioxide â?? SiO2 which is generated as a gas in submerged electrical arc furnaces during the reduction of very pure quartz. As the molten metal is produced, a silica-based gas is emitted. This gaseous fume, as it rises, cools rapidly and forms extremely minute,Amorphous, spherical particles. The microsilica is collected in a bag house, a system for filtering the hot air and gases vented from the furnace. This gas vapor is condensed in bag house collectors as very fine powder of spherical particles that average 0.1 to 0.3 microns in diameter with a surface area of 17 to 30 m2/g.
Microsilica can be used in concrete and refractory materials. Microsilica ,when used in concrete, it can improve concreteâ??s properties such as compressive strength, bond strength and abrasion resistance, reduces permeability,and therefore helps in protecting reinforcing steel from corrosion. At the same time, Microslica can still be used in the procustion of refractory and porcelain, to raise intensity and durability, it also can be used in paint, coating resin rubber and other high molecular as a filler material to improve the material overall performance.
