Overview
Oyster shell concentrate powder is a sustainable calcium source derived from crushed and purified oyster shells. It is valued for its high bioavailability and eco-friendly profile, making it a preferred alternative to synthetic calcium compounds. The powder is produced through calcination and milling processes, ensuring consistent particle size and purity. In B2B markets, it is commonly traded as a bulk raw material for agricultural, aquacultural, and nutritional industries. Its natural composition aligns with organic and non-GMO product standards, appealing to environmentally conscious buyers.
Physical and Chemical Properties
The powder consists predominantly of calcium carbonate (CaCO₃), with trace minerals like magnesium and strontium. Its insolubility in water necessitates acid treatment for certain applications, such as liquid fertilizers. The particle size typically ranges from 100 to 500 mesh, affecting dissolution rates and mixing efficiency. With a neutral to slightly alkaline pH (8-9), it effectively neutralizes acidic soils. The powder’s low moisture content (<1%) ensures long shelf life but requires airtight packaging to prevent clumping. Thermal stability allows it to withstand feed pelleting processes without degradation.
Main Applications
In agriculture, the powder serves as a slow-release soil amendment, improving crop calcium uptake and reducing aluminum toxicity. For poultry and livestock feed, it enhances eggshell strength and bone development. Aquaculture operations use it to stabilize water pH and promote shellfish growth. The nutraceutical industry incorporates it into calcium supplements due to its natural origin and high elemental calcium content (up to 40%). Recent innovations include nano-sized formulations for improved absorption in human health products. Industrial uses extend to wastewater treatment for heavy metal precipitation.
Safety and Storage
While non-hazardous, the powder’s fine particles may cause respiratory irritation during handling. PPE such as dust masks and goggles is recommended for bulk processing. Storage requires moisture-proof containers to prevent caking and maintain flowability. Regulatory compliance varies by region: EU feed-grade products must meet EC No 1831/2003 standards, while USDA Organic certification requires documentation of shell sourcing. Heavy metal limits (e.g., <10 ppm lead) should be verified via third-party lab reports for sensitive applications like infant nutrition.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO 22000 or FAMI-QS certification for feed applications. Key specifications to negotiate include calcium carbonate content (min. 95%), particle size distribution, and microbiological purity. Bulk shipments typically use 25kg multi-layer paper bags with polyethylene liners. Seasonal price fluctuations occur due to oyster harvesting cycles; forward contracts are advisable for large-volume users. Sample testing for contaminants like arsenic and cadmium is critical, especially for export markets with strict food safety regulations. MOQs usually start at 1 metric ton for competitive pricing.
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