Advantages and application of microsilica fume powder for refractory materials

silica fume application

Refractory material microsilica fume 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 fume powder changes from white, gray-white, gray to dark gray, and the average particle size of 0.1~0.15μm, which is a kind of super micro particles. Its specific surface area is around 2000㎡/g, about 50 times larger than that of fly ash, and the surface of the particles is smooth and spherical.

The advantages of refractory silica fume powder.

Improve the strength of refractory castables.

There are many pores in traditional refractory materials, refractory micro-silica fume powder fills in the pores, improves bulk density and reduces porosity, which can significantly improve the strength.

Improve casting performance.

Refractory microsilica fume 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.

Improve the high temperature resistance and durability of refractory materials, prolong the service life of products, thus reducing costs.

Microsilica fume powder is easy to form -Si-OH group in water, which has strong hydrophilic and activity, and can enhance the cohesion of refractory materials, as well as improve the high temperature performance and extend the service life of refractory castables.

Microsilica fume powder processing is the process of collecting the micro-silica fume 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 fume 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% micro-silica fume powder, and smelting industrial silicon can produce about 15% micro-silica fume powder, which can be collected by dust collector. Refractory material micro-silica fume powder 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, settling in the alveoli, causing silica (silicon) lung disease.

The scope of application of refractory micro-silica fume powder.

Micro silica fume powder is a kind of high quality admixture and raw material for industrial application, using it as mortar, concrete admixture, can improve the microporous structure, improve 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 platforms, large pipelines and other projects.

Refractory material micro silica fume powder mixed in high alumina bricks, magnesium bricks, sliding water mouth bricks and other refractory materials can improve the quality, the use of micro silica fume 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 fume powder can also be used to produce high modulus water glass, high temperature coatings, as a filler for organic materials, insulation material for molten metal, anti-caking agent for fertilizer, and mixed with potassium hydroxide or potassium carbonate to make slow-acting potassium silicate agricultural fertilizer, etc.

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