Introduction to the main application fields of silicon powder

Silicon powder is dust recovered from metal silicon or ferrosilicon alloy smelting, the main component is silicon dioxide. As an important inorganic non-metallic material, silica powder has good physical and chemical properties: small particle size, light weight, large specific surface, high refractoriness, and is widely used in rubber, ceramics, refractory, chemical and other fields.

The application of silica powder in concrete industry is a field where the recovery and utilization of silica powder is early, with many achievements and wide application at home and abroad. The main use of silica powder excellent physical and chemical properties, it is used as a admixture added to the concrete can effectively change the performance of all aspects of concrete.
After studying the effect of silica fume on the hardness of inorganic minerals, polymers and concrete containing fly ash, it is concluded that when a part of silica fume is added, the workability of concrete mixture is reduced, but the mechanical properties of concrete after hardening are significantly improved, and the best experimental effect is that the amount of silica fume is 10%.
Adding appropriate amount of silica powder in ordinary concrete can not only reduce the amount of cement, but also improve the strength, crack resistance and impermeability of concrete.

High-quality silica powder is mainly used as high-performance refractory castables, prefabricated parts, ladle materials, breathable bricks, self-flowing refractory castables and dry-wet spraying materials. In the field of high temperature ceramics, silicon powder has the characteristics of high fluidity, low water storage, high density and high strength, which can improve the strength and wear resistance of sintered products.
The combination of silicon micropowder and α-Al₂ O-powder can improve the performance of the material. The best dosage is 6% silicon micropowder and 2% α-Al₂ O-powder. When the amount of α-Al₂ O-powder is certain, the amount of silicon powder is increased, and the water consumption is significantly reduced.
After the addition of silica powder in the unshaped refractory, the strength, pouring performance, high temperature resistance and durability of the unshaped refractory are effectively improved.

Silica powder can be used as cement raw material. The addition of 18%-25% silica fume to cement raw materials can improve the output and cement quality of cement kiln, and the production capacity of the kiln is increased by 10%-20%, and the compressive strength is increased from 47MPa to 5456MPa.
The results show that the effect of silica powder on the flexural strength, impact strength, water absorption, bulk density and dry shrinkage of fiber reinforced cement. When the amount of silica powder is 4%-6%, the flexural strength and impact strength of fiber reinforced cement are obviously improved, and the water absorption rate and volume mass are reduced.

In plastics, rubber, coatings and other modern polymer materials, non-metallic mineral fillers occupy a very important position. Adding non-metallic mineral fillers such as silicon powder to the polymer base material can not only reduce the cost of polymer materials, but also improve the performance and dimensional stability of the material, and endow the material with some special physical and chemical properties, such as compression resistance, impact resistance, corrosion resistance, flame retardant, insulation and so on.
In the flame retardant insulation coating patent by adding silicon powder, can improve the thixotropic properties of the coating, the coating has a uniform coating, no cracks and has a short curing time, low cost and so on.
In the electrical insulation sealant, butyl rubber is used as the base material and silicon powder is added. The film has high insulation strength, waterproof, heat resistance, cold resistance, chemical corrosion resistance, aging resistance, good plasticity, and good insulation.

With its excellent physical and chemical properties, silicon powder is also widely used in metallurgy, chemical industry, environmental protection and other fields.
Silicon powder and potassium hydroxide or potassium carbonate mixed heating can be made into slow agricultural fertilizer potassium silicate, with the characteristics of non volatile loss, can protect the soil, promote crop root development, inhibit pests and diseases, in addition to silicon powder can also prevent fertilizer agglomeration. Silica powder can also be used as a dispersion isolation agent for chemical products, and is widely used in fine pesticides, fertilizers, fire extinguishing agents and other products, it can be said that the use is very extensive.