Overview
Shell granules are processed particles from marine shells, primarily composed of calcium carbonate. They are a sustainable byproduct of aquaculture and fishing industries, offering an eco-friendly alternative to mined limestone. Their natural porosity and hardness make them versatile for industrial and agricultural use. Globally, regions with coastal economies, such as Southeast Asia and Scandinavia, are major producers. The granules are typically sorted by size (0.5–10 mm) and washed to remove organic residues, ensuring consistent quality for B2B buyers.
Physical and Chemical Properties
Shell granules exhibit high mechanical strength due to their layered microstructure, derived from the original shell's nacre. Chemically, they are 90–95% calcium carbonate, with trace minerals like magnesium and strontium. Their alkaline nature (pH ~9) makes them effective for neutralizing acidic soils. Unlike synthetic fillers, shell granules degrade slowly, releasing calcium over years. Their low solubility in water ensures longevity in outdoor applications. However, they may react with strong acids, producing CO₂ gas.
Main Applications
In agriculture, shell granules are spread as a slow-release lime substitute to improve soil pH and provide calcium for crops. Their porosity also enhances soil aeration. Construction industries use them as lightweight aggregates in concrete or asphalt, reducing material costs while maintaining durability. Decorative applications include terrazzo flooring, aquarium substrates, and craft materials. Recent innovations explore their use in water filtration systems due to their adsorption properties for heavy metals.
Safety and Storage
While non-hazardous, shell granules can generate dust during handling, requiring PPE like masks and goggles. Storage should avoid humid conditions to prevent clumping. Bulk shipments are typically packed in woven sacks or silos. For fire safety, shells are non-combustible but may decompose at high temperatures. Spills pose no environmental risk and can be swept or reused.
B2B Procurement Guide
Buyers should specify particle size distribution (e.g., 2–4 mm for soil amendment) and calcium carbonate content (≥90% for industrial use). Suppliers often provide lab certificates for purity and heavy metal testing. Bulk purchases (20+ tons) may qualify for discounts. Coastal suppliers offer logistical advantages, while inland buyers should factor in transport costs. Samples are recommended to verify color consistency and granule integrity.
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