What is Silica Fume?
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What is it?
Silica fume, also known as microsilica, is an ultrafine pozzolanic material. It’s essentially a very fine powder, much like the consistency of ash, composed mainly of amorphous silicon dioxide (SiO2).
How is it made?
Silica fume is a byproduct of the production of silicon metal and ferrosilicon alloys. During the smelting process, high-purity quartz is reduced with coal in electric arc furnaces. The intense heat vaporizes some of the silica, which then condenses into ultra-fine particles as it cools down. These particles are collected and processed to create silica fume.
![What is Silica Fume? 16 1624000872281212](https://hsachn.com/wp-content/uploads/2023/12/1624000872281212.jpg)
What are its properties?
Silica fume has several unique properties that make it valuable in various applications:
Physical characteristics:
Color: gray or gray white powder
Refractoriness: >1600℃
Bulk density: 250-700 kg/m3
Chemical composition:
Items | SiO2 | Al2O3 | Fe2O3 | MgO | CaO | Na2O | PH average value |
content | 75~98% | 1.0±0.2% | 0.9±0.3% | 0.7±0.1% | 0.3±0.1% | 1.3±0.2% | neutral |
What are its uses?
Silica fume is primarily used as a mineral admixture in high-performance concrete. It’s particularly beneficial in applications where:
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Founded in 2001, HSA is a leading provider of Silica Fume and Abrasives in China, and also the premium source of high-performance Products for concrete and abrasives industries.