The primary component of silica fume is amorphous silicon dioxide SiO2 in a range of 85 % – 98 %. The main impurities include carbon, silicon carbide and oxides of alkaline (earth) metals. As silica fume is generated from raw materials which inevitably vary in composition depending on the source, the impurities will also individually […]
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Silica Fume is an ultrafine powder. Primary silica fume particles that exhibit a perfectly spherical shape are in the size range of 0.02 – 1.0 µm (average particle size 0.15 µm). During collection, cooling and bagging, the primary particles form larger agglomerates (not aggregates), as shown in the Transmission Electron Microscopy (TEM) pictures. The specific
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Silica fume is a very fine powder – the particles are approximately 1/100 the diameter of portland cement grains. When used to produce high-performance concrete, silica fume is typically 4-15% of cement weight. The exact addition rate depends upon the specific performance characteristic to be improved. Compared to the other ingredients in concrete, the amount
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SGS-CSTC Standards ASTM C 1240-11 Microsilica Fume Testing report
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Bulk Density:300-350kg/m3 SiO2: 88% – 97%min 500kgs/jumbo bag, 25kg/PP bag, or as customer’s request Introduction Micro silica ,also called silica fume or micro silica, is a byproduct of production silicon metal or ferrosilicon alloys. Silicon metal and alloys are produced in electric furnaces.The raw materials are quartz,coal and woodchips.The smoke that results from furnace operation
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The undensified silica fume is produced by the condensation of gas and dust released by metal silicon at high temperature. It has the characteristics of large specific surface, high activity and strong micro aggregate. Because of its low accumulation density, about 200 kilograms per cubic meter, the volume of densified silica fume is larger than
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According to different application, Henan Superior Abrasives supply different grade microsilica /silica fume. Henan Superior Abrasives white silica fume is applied to the compound fertilizer, pesticide (as adsorbent, or producting silicon fertilizer), coating, paint (as a thickener, anti-sinking agent), rubber (as reinforcing agent), plastic (as the filling agent), special porcelain, can substitute the white carbon
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It is widely used in high performance refractory castables, silicon nitride sintering aids, ladle materials, self flow refractory castables, prefabricated parts, low or no cement castables and dry wet spraying materials, with high quality micro silica fume with ultra-fine particle size, low water storage and high fluidity. The specific performance and effect: can binder as
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Silicon Smelting To understand silica fume, it becomes inevitable to first understand the smelting of silicon metal. Silicon is smelted in large submerged arc electric furnaces. A typical 20 MW furnace might be as large as 40 feet in diameter and 15 feet deep. There are 3 electrodes, which could be up to 60 inches
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85% Undensified Silica Fume Chemical Component Element Specification Value SiO2: % 85min 88.1 Cl: % 0.1max 0.013 H2O: % 2.0max 0.98 92% Undensified Silica Fume Properties Specification Value Loss on Ignition% 6 max 2.25 Coarse particles > 45um % 10.0max 1.8 Bulk density:kg/m3 190-280 230 Specific Surface Area: m2/gm 15-30 19 Specific Gravity 2.0-2.5 2.2
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