Do you know the difference in chemical properties between microsilica powder, silica powder and white carbon black?

” >Many friends know that white silica powder is commonly known as silica, The main component of silica black isSiO2 is named because it is white and its main physical properties and uses are similar to carbon black. The microsilica powder we are talking about today, The main components of silica powder and silica are actually silica, but there are differences between them‘sChemical propertiesWhat are the differences and connections?

” >(1) Microsilica powder

” >①Appearance and basic chemical composition:

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” >Appearance is gray or off-white powder, fire resistance>1600℃. Bulk weight: 1600~1700 kg/cubic meter. The chemical composition is as follows: SiO2 content: 75~98% Al2O3 content: 1.0±0.2% Fe2O3 content: 0.9±0.3%

” >②Fineness and specific surface area:The fineness of silica fume is less than 1μm accounts for more than 80%, the average particle size is 0.1~0.3μm, and the specific surface area is: 20~28m2/g. Its fineness and specific surface area are about 80 to 100 times that of cement and 50 to 70 times that of fly ash.

” >③Particle morphology and mineral structure:During the formation process of silica fume, it is subject to surface tension during phase change.Due to the action of �, amorphous spherical particles with a smooth surface are formed in the non-crystalline phase, and some are agglomerates of multiple spherical particles stuck together. For materials mixed with silica fume, the tiny spheroids can play a lubricating role.

” >(2) Silicon powder

” >①Appearance and basic chemical composition:

” >Appearance is gray or off-white powder, fire resistance>1600℃. Bulk weight: 200~250kg/cubic meter, the ingredients are as follows:

” >SiO2 content: ≥99.0%, Al2O3 content: ≤0.3%Fe2O3 content: ≤0.02%

” >②Fineness and specific surface area:200-5000 mesh, specific surface area 20~28m2/g

” >(3) White carbon black

” >①Appearance and basic chemical composition:White powderThe general name of X-ray amorphous silicic acid and silicate products, mainly refers to precipitated silica and fumed silica, which are porous substances. The composition can be expressed as SiO2·nH2O, where nH2O exists in the form of surface hydroxyl groups. Soluble in caustic alkali and hydrofluoric acid, but insoluble in water, solvents and acids (except hydrofluoric acid). It is high temperature resistant, non-flammable, tasteless, odorless, and has good electrical insulation. Melting point: 1610 °C (lit.) Bulk density: 0.2g/ml (common products by precipitation method) The chemical composition is as follows: SiO2 (dry product ≥90%), Al2O3 content: ≤0.2%, Fe2O3 content: ≤0.1%

” >②Fineness and specific surface area:Fineness from20-5000 mesh range, different fineness can be produced according to customer requirements, specific surface area: silica has ultra-high specific surface area, precipitation method Generally 100-300㎡/g,Gas phase methodWhite carbon black can reach 400㎡ /g or above.

Produce different fineness, specific surface area: silica has ultra-high specific surface area, the precipitation method is generally 100-300㎡/g,Gas phase methodSilk black can reach more than 400㎡/g.