Silica powder is dust recovered from the smelting of metallic silicon or ferrosilicon alloys. Its primary component is silicon dioxide. As an important inorganic non-metallic material, silica powder possesses excellent physical and chemical properties, including small particle size, light weight, large specific surface area, and high refractoriness. It is widely used in rubber, ceramics, refractories, chemicals, concrete, and other fields.
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Silica powder's application in the concrete industry is an area where research into its recycling and utilization has been early, fruitful, and widespread both domestically and internationally. Its excellent physical and chemical properties are primarily leveraged as an admixture in concrete, effectively improving various concrete properties.
Functions and Effects: Research has shown that adding an appropriate amount of silica powder (e.g., 10%) to concrete containing fly ash may slightly reduce the workability of the mix, but significantly improves the mechanical properties (such as hardness) of the hardened concrete. Adding an appropriate amount of silica powder to ordinary concrete can reduce cement usage while improving concrete strength, crack resistance, and impermeability.
2Applications in Refractory Materials
High-Performance Refractory Materials: High-quality silica powder is primarily used in high-performance refractory castables, precast components, ladle linings, air-permeable bricks, self-flowing refractory castables, and wet and dry spraying materials.
High-Temperature Ceramics: In high-temperature ceramics, silica powder provides high fluidity, low water retention, high density, and high strength, thereby enhancing the strength and wear resistance of sintered products.
Performance Optimization and Ratio: Combining silica powder with α-Al₂O₃ powder (optimal dosages, such as 6% silica powder and 2% α-Al₂O₃ powder) can significantly enhance material performance. When the α-Al₂O₃ powder dosage remains constant, increasing the silica powder dosage can significantly reduce water consumption. Adding silica powder to monolithic refractories effectively improves their strength, castability, high-temperature resistance, and durability.
3Applications in Cement
Cement Raw Materials: Microsilica powder can be used as a cement raw material. Adding 18%-25% microsilica powder to cement raw materials can increase cement kiln output (by 10%-20%) and cement quality (for example, increasing compressive strength from 47 MPa to 54-56 MPa).
Fiber-Reinforced Cement: Research has shown that adding 4%-6% microsilica powder significantly improves the flexural and impact strength of fiber-reinforced cement, while reducing water absorption and bulk density.
4Applications in Polymer Materials (Plastics, Rubber, and Coatings)
Filler Function: Silica powder, as a non-metallic mineral filler, plays an important role in polymer materials (plastics, rubber, and coatings, among others). Adding silica powder to polymer base materials not only reduces costs but also improves material properties (such as compression resistance, impact resistance, corrosion resistance, flame retardancy, and insulation) and dimensional stability, while also imparting unique physical and chemical properties.
Specific application examples include flame-retardant insulating coatings. Patented technology incorporates silica powder to enhance the coating's thixotropic properties, ensuring uniform, crack-free application, a fast curing time, and low cost. Electrical insulation sealants, made with butyl rubber as a base and incorporating silica powder, offer high dielectric strength, water resistance, heat and cold resistance, chemical resistance, aging resistance, excellent plasticity, and excellent insulation.
5Applications in Other Industrial Fields
Metallurgy, Chemical Industry, and Environmental Protection: Microsilicon powder, due to its excellent physical and chemical properties, is widely used in these fields.
Agricultural Fertilizer: Microsilicon powder can be mixed with potassium hydroxide or potassium carbonate and heated to produce slow-release agricultural fertilizer potassium silicate. This fertilizer resists volatilization, protects the soil, promotes crop root development, and suppresses pests and diseases. Microsilicon powder also prevents fertilizer from clumping.
Chemical Additives: Microsilicon powder can be used as a dispersing and release agent in chemical products and is widely used in products such as fine pesticides, fertilizers, and fire extinguishing agents.
6Guote's Silicon powder production line
[Overview]: Silica powder (quartz powder) production line is a complete set of process equipment that processes quartz raw materials (quartz sand, quartz stone, etc.) into silicon dioxide powder with different particle sizes and purity requirements. Its core goal is to achieve efficient, precise, stable and environmentally friendly production.
[Production line advantages]: This production line is an organic combination of high-purity sand grinder crushing technology, ball mill grinding technology, and airflow classification technology, which can give full play to their respective technical advantages.
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