Calcite Powder[2]
Overview
Calcite Powder is a versatile industrial mineral derived from natural limestone or marble. It is processed through crushing, grinding, and classification to achieve desired particle sizes. Its primary component, calcium carbonate, makes it chemically stable and widely applicable. The powder is categorized by particle size (ranging from coarse to ultrafine) and brightness, which determines its suitability for different industries. High-purity calcite powder is preferred for food-grade and pharmaceutical applications, while industrial-grade variants are used in construction and manufacturing.
Physical and Chemical Properties
Calcite Powder exhibits high whiteness (90-98% brightness) and low oil absorption, making it ideal for coatings and paints. Its Mohs hardness of 3 ensures minimal abrasion to processing equipment. The powder is insoluble in water but reacts with acids to release carbon dioxide. Thermal stability up to 825°C allows its use in high-temperature applications. Its pH-neutral nature (pH ~9) makes it a common buffering agent in agriculture and wastewater treatment. Particle size distribution (1-20 microns) is critical for performance in specific applications like paper coating or polymer filling.
Main Applications
In plastics, calcite powder improves stiffness, thermal stability, and reduces costs. It accounts for 20-30% of composite materials like PVC pipes and profiles. The paper industry uses it as a coating pigment to enhance opacity and printability. Construction applications include cement additives, tile adhesives, and self-leveling compounds. Agricultural lime, derived from calcite powder, neutralizes acidic soils. Recent innovations include its use in biodegradable plastics and carbon capture technologies due to its environmental compatibility.
Safety and Storage
While non-toxic, prolonged inhalation of airborne particles may cause respiratory irritation. OSHA recommends a permissible exposure limit (PEL) of 15 mg/m³ for total dust. Use NIOSH-approved N95 masks in high-dust environments. Store in sealed containers or bulk bags to prevent moisture absorption, which can lead to clumping. Avoid contact with strong acids, which may cause hazardous CO2 release. Transport as a non-hazardous material, but ensure containers are securely closed to prevent spillage.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and consistent quality control. Key specifications to request include: particle size distribution (D50, D97), brightness (ISO 2470), and acid-insoluble content (should be <0.5% for high-grade powder). Bulk purchases (20+ metric tons) typically qualify for 10-15% discounts. Consider regional suppliers to minimize logistics costs, as calcite powder is heavy. For specialty applications, request samples for compatibility testing with your production process before large-scale procurement.
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