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Advantages, Disadvantages and Applications of Refractory Microsilica Powder

Refractory Microsilica Powder

Refractory microsilica powder is amorphous structure, with good volcanic ash surface activity. With the increase of carbon and iron oxide content, the appearance color of micro-silica powder changes from white, gray-white, gray to dark gray, and the average particle size is 0.1~0.15μm, which is a kind of super micro particle. Its specific surface area is around 200000cm2/g, about 50 times larger than that of fly ash, and the surface of the particles is smooth and spherical.

Refractory Microsilica Powder Advantages

1.  Improve the strength of refractory castables
There are many pores in traditional refractory materials, and the refractory micro silica powder fills in the pores, which improves the bulk density and reduces the porosity, and can improve the strength obviously.
2. Improve casting performance
Refractory micro-silica powder has strong activity and can form colloidal particles in water, adding the right amount of dispersant can enhance the fluidity, thus improving the casting performance.
3. Improve the high temperature resistance and durability of refractory materials, prolong the service life of products, thus reducing costs
Microsilica powder has strong hydrophilic and activity, which can enhance the cohesion of refractory materials, and at the same time has a greater improvement on high temperature performance, and can extend the service life of refractory castables.

Refractory Microsilica Powder Disadvantages

Refractory microsilica dust is a respiratory (also known as inhalable) dust, which floats in the air for a long time, spreads widely, pollutes the environment seriously, and is very easy to enter the human lungs and settle in the alveoli, causing silica (silicon) lung disease.

How is silica fume produced?

Micro-silica powder processing is the process of collecting the micro-silica powder in the soot discharged during the production of industrial silicon or ferrosilicon alloys containing more than 75% silicon, so that it can be used in a comprehensive manner. Micro-silica powder is a particle made from the rapid oxidation and condensation of a large amount of high-temperature SiO and Si gas with air during the production of industrial silicon or ferrosilicon alloys containing more than 75% silicon with an electric arc furnace, also known as silicon soot. Smelting 75% ferrosilicon can produce about 10% of micro-silica powder, and smelting industrial silicon can produce about 15% of micro-silica powder, which can be collected by dust collector.

silica fume produced

Application Scope of Refractory Microsilica Powder

Microsilica powder is a kind of high quality admixture and raw material for industrial application, using it as mortar and concrete admixture can improve the microporous structure, increase the compactness, can greatly improve the strength and wear resistance, corrosion resistance, seepage resistance, frost resistance and other properties, used in projects with special requirements, such as high-rise buildings, tunnels, seaports, dams, roads and bridges, oil recovery platforms, large pipelines and other projects.

Refractory micro silica powder mixed in high alumina brick, magnesium brick, sliding water mouth brick and other refractory materials can improve the quality, the use of micro silica powder in low cement and ultra-low cement refractory castings can improve the normal temperature, medium temperature, high temperature strength, high temperature wear resistance, high temperature erosion resistance and other properties, applied in the working conditions of harsh, ordinary refractory castings can not be competent kilns and other high temperature equipment.

In addition, micro silica powder can also be used to produce high modulus water glass, high temperature coatings, used as filler for organic materials, insulation material for molten metal, anti-caking agent for fertilizer, mixed with potassium hydroxide or potassium carbonate and heated to make slow-acting potassium silicate agricultural fertilizer, etc.

Refractory Microsilica Powder Supplider

Henan Superior Abrasives Import & Export Co., Ltd (HSA) is one of the largest suppliers of microsilica powder in China.We can supply 85%, 92%, 94%, 96%, 99% Undensified Silica Fume and 85%, 92%, 94%, 96% Densified Silica Fume, our products have been exported to various countries and regions all over the world. With strict labeling, high quality products and low price, we have received good reputation from our customers.

For more information, please visit https://hsamaterial.com/silica-fume

If you have any needs and questions, you can directly send an email to sales@superior-abrasives.com or leave a message in the form below, we will reply to you as soon as possible, thank you.


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