Overview
Calcined shell powder sand is a sustainable material produced by heating seashells (typically oyster, clam or scallop) to high temperatures (800-1000°C) to drive off organic matter and convert calcium carbonate to more reactive calcium oxide. The resulting product is then ground to specific particle sizes. This material has gained attention in circular economy models as it repurposes seafood industry waste. The calcination process enhances its chemical reactivity and creates a porous structure, making it particularly valuable for environmental and industrial applications where conventional mineral calcium carbonate may be less effective.
Physical and Chemical Properties
The material's properties vary based on shell source and calcination parameters, but generally exhibits high surface area (15-30 m²/g) and alkaline pH (9-10) when mixed with water. Its porous structure provides excellent adsorption capacity for heavy metals and organic compounds. Chemically, it consists primarily of calcium oxide (CaO) and calcium hydroxide (Ca(OH)2) with minor amounts of magnesium compounds and trace minerals from the original shells. The thermal processing increases its reactivity compared to untreated shell powder, particularly in acid neutralization applications.
Main Applications
In construction, it serves as an eco-friendly additive in cement and mortar, improving workability and reducing carbon footprint. The agricultural sector uses it for soil pH adjustment and as a slow-release calcium source, especially in organic farming systems. Industrial applications include wastewater treatment (for phosphorus removal and pH adjustment), flue gas desulfurization, and as a filler in plastics and paper. Recent developments explore its use in bio-composites and as a catalyst support material due to its unique microstructure.
Safety and Storage
As an alkaline material, appropriate PPE (gloves, goggles, dust masks) should be used when handling to prevent skin/eye irritation or respiratory discomfort from dust. The material is non-flammable and non-explosive. Storage requires protection from moisture to prevent premature reaction with atmospheric CO2 and water vapor. Bulk storage should be in silos or sealed containers with desiccants. Smaller quantities are typically packaged in multi-layer moisture-proof bags with plastic liners.
B2B Procurement Guide
Key specifications to verify include calcium oxide content (typically 85-92%), particle size distribution (common ranges: 100-400 mesh), loss on ignition (LOI <5%), and heavy metal content (especially important for agricultural and feed applications). Bulk buyers should evaluate suppliers based on consistent shell source (affects trace mineral content), calcination process control, and quality certification (such as organic certification for agricultural uses). Transportation costs significantly impact total price due to the material's bulk density.
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