Overview
Calcium sand, primarily composed of calcium carbonate (CaCO3), is a versatile industrial material derived from crushed limestone or precipitated calcium carbonate processes. It serves as a cost-effective raw material in multiple industries due to its high calcium content and chemical stability. Unlike fine calcium carbonate powders used in food or pharmaceuticals, calcium sand features larger particle sizes (0.1-5mm) optimized for bulk handling and controlled reactivity. Its natural alkaline properties make it particularly valuable for pH adjustment applications.
Physical and Chemical Properties
The material exhibits a Mohs hardness of 3, making it softer than quartz sand but sufficiently durable for most industrial applications. Its neutral white color and low impurity content are critical for metallurgical uses where trace elements could affect product quality. Chemically, calcium sand reacts with acids to produce carbon dioxide, a property utilized in flue gas desulfurization. Its thermal decomposition at 825°C yields calcium oxide (quicklime), an important reaction in steelmaking and cement production.
Main Applications
In steel manufacturing, calcium sand functions as a flux to remove impurities during the basic oxygen process. The construction industry utilizes it as a filler in concrete and asphalt mixtures, where it improves workability and reduces shrinkage cracks. Environmental applications include acid mine drainage treatment and flue gas scrubbing systems. Recent developments also see calcium sand being used in aquaculture to maintain water alkalinity and provide calcium for shell growth in mollusks.
Safety and Storage
While non-hazardous under normal conditions, prolonged exposure to calcium sand dust may cause respiratory irritation. OSHA recommends permissible exposure limits of 15mg/m³ for total dust and 5mg/m³ for respirable fraction. Storage requires protection from moisture to prevent caking. Bulk bags or silos with proper aeration are preferred for large quantities. The material is non-combustible and chemically stable, requiring no special fire suppression measures.
B2B Procurement Guide
Industrial buyers should specify calcium carbonate content (typically 90-98% for standard grades), with higher purity commanding premium pricing. Particle size distribution significantly affects performance - steelmaking requires 1-3mm grains while water treatment may use finer grades. Reliable suppliers should provide material safety data sheets (MSDS) and certificate of analysis (CoA). Bulk purchases (20+ tons) often qualify for discounted rates. Consider proximity to transportation hubs as freight costs can equal 30-50% of material costs for long-distance shipments.
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