Overview
White powder silicate refers to a group of compounds containing silicon-oxygen anions combined with metal cations, most commonly sodium or potassium. These inorganic materials are fundamental in multiple industrial processes due to their unique chemical properties. Silicate powders are typically produced through high-temperature reactions of silica sand with alkali carbonates. The resulting products vary in their SiO2-to-M2O ratios (where M is Na or K), which determine their solubility and reactivity. Industrial grades often contain 40-50% active solids when dissolved.
Physical and Chemical Properties
The material appears as a free-flowing white powder with excellent shelf stability when kept dry. Its alkaline nature (pH 11-12 in solution) makes it reactive with acids, forming silica gels. The powder exhibits notable hygroscopicity, requiring careful moisture control during storage. Key chemical characteristics include high thermal stability (up to 1000°C for anhydrous forms) and the ability to undergo polymerization reactions. The viscosity of silicate solutions increases dramatically with concentration, a property exploited in many industrial applications.
Main Applications
In detergents, silicates function as builders that enhance cleaning efficiency while protecting metal surfaces. The construction industry utilizes them as cement additives for improved durability and reduced efflorescence. Manufacturers of refractory ceramics employ silicates as binders for high-temperature applications. Other significant uses include paper production (as a coating agent), water treatment (for heavy metal precipitation), and foundry operations (in core-making processes). Emerging applications include their use in eco-friendly construction materials and fire-resistant coatings.
Safety and Storage
As an alkaline material, powder silicate requires proper personal protective equipment including goggles, gloves, and dust masks during handling. The powder can cause respiratory irritation if inhaled and mild skin irritation upon prolonged contact. For optimal storage, maintain the product in its original sealed packaging at ambient temperatures (15-25°C) with relative humidity below 60%. Bulk storage silos should incorporate desiccant breathers to prevent moisture absorption. In case of spills, avoid creating dust clouds - dampen with water and collect for proper disposal.
B2B Procurement Guide
Industrial buyers should specify the modulus (SiO2:M2O ratio) required for their application, with common ratios ranging from 1.6 to 3.3. Particle size distribution affects dissolution rates - finer powders (200-400 mesh) dissolve faster but may create more dust. Consider purchasing in bulk (500kg+ bags or tanker deliveries for liquid forms) for cost efficiency. Verify supplier certificates for heavy metal content, especially for food-grade applications. Leading manufacturers include PQ Corporation, Tokuyama, and Nippon Chemical.
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