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Home / Micro Silica
      Micro Silica

      Micro silica fume is a high activity pozzolanic material with large surface area. Micro silica in materials will play the role of lubrication with the tiny spherical body. Micro silica in the special refractories can form a multi-layer protective layer during oxide. It has good mechanical properties and resistance to high temperature and oxidation.

      Micro silica Description:

       

      Micro silica, or Silica Fume in the special refractories can form a multi-layer protective layer during oxide. Micro silica has good mechanical properties and resistance to high temperature and oxidation. The special refractory with micro silica powder has obvious improving on the flowability, sintering properties, binding, filled pores performance.

       

       

      Micro silica Physicochemical Properties:

       

      1, Micro silica appearance: white;Refractoriness > 1600 ℃; Bulk density: 200 to 250 kg / m3.

      2, Micro silica fineness: 90% fineness of 0.1μm; average particle size of 0.1 ~ 0.2μm, specific surface area: 20 ~ 28m2 / g. Micro silica fineness and specific surface area is 80 to 100 times of that  of cement, 50 to 70 times of fly ash.

       

      3, Micro silica particle morphology and mineralogical structure: Due to the surface tension of the phase change, micro silica fume forms into amorphous phase amorphous spherical particles with smooth surface, or a plurality of ball particles stick together.

       

      Micro silica fume is a high activity pozzolanic material with large surface area. Micro silica in materials will play the role of lubrication with the tiny spherical body.

       

      micro-silica-lab

       

      Micro silica Specification:

       

      500um-180um(30 mesh-80 mesh) +500um≤3% -180um≤10%

      425um-150um(40 mesh-100 mesh) +425um≤5% -150um≤15%

      250um-140um(60 mesh-110 mesh) +250um≤3% -140um≤10%

      125um-74um(120 mesh-200 mesh) +125um≤3% -74um≤10%

      -74um(-200 mesh) +74um≤5%

      -45um(325 mesh) +45um≤5%

      5um-1um(2500 mesh-12500 mesh) +5um≤5%

       

      Micro silica is a new high-performance buildings or concrete admixture miserable mixture, which is widely used in industries for refractory casting materials, industrial floor, wall insulation, filling materials, foam cement concrete. Under normal circumstances the adding of silica fume can be two ways, blended within and mixed outside. Addition amount of Micro silica is generally 5-10% of cementitious materials (cement, plaster, water glass, etc.) Micro silica shall be used with water-reducing agent, proposed re-mixed with fly ash and ground mining powder to improve its workability.

      1. After adding aggregate, add micro silica and cement without delay, then add water and other admixtures.
      2. Add coarse aggregate + 75% water + micro silica + 50% fine aggregate, and stirred for 15-30 seconds, then put cement + additive + 50% fine aggregate + 25% water and stirred. Stirring time is 20-25% longer than that of ordinary cement or 50-60. Avoid put the silicon powder to the already mixed concrete.
       
       

      Advantages of Micro silica:

       

      Traditional refractory material has many pores, while micro-silica fills in the pores improving the bulk density and reduces porosity, and the strength can be significantly enhanced.

       

      Micro-silica powder has a strong activity in the water so that can form colloidal particles, which can enhance the mobility by adding dispersant, thereby improving the casting performance.

       

      Micro-silica fume is easy to form a base in water with strong hydrophilic and active, can enhance the aggregation of refractories, while the high temperature performance has greatly improved, and extend the service life of refractory products.

       

      Micro-silica fume is widely used in the fire-resistant industries:

      1.      Instead of pure aluminum oxide mud as refractory material.

      2.      As the additive for production of amorphous and shaped refractory products, to improve the strength, and high temperature performance.

      3.      Other refractory products like cohesive agent, bonding agent, accelerator and additives.

       

      LINKS: Bulk Refractories | Chrome Brick | Kyanite | Guangxi Pak Nai | High Alumina Cement | Hexametaphosphate | Heat-Resistant Stainless Steel Fibers | High Alumina Cement | Kyanite | Alumina Hollow Ball | α Alumina Powder

       

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