Overview
High-calcium shell powder is a sustainable byproduct of processed marine shells, primarily composed of calcium carbonate (CaCO₃). Sourced from oysters, clams, or scallops, it undergoes cleaning, drying, and micronization to produce a fine powder. Unlike synthetic calcium carbonate, it retains trace minerals like magnesium and strontium, enhancing its value in agricultural and biological applications. As a circular economy product, it repurposes shellfish waste from aquaculture and food industries. Its natural alkalinity and slow-release calcium make it particularly valuable for acidic soil remediation and as an alternative to limestone in pH adjustment.
Physical and Chemical Properties
The powder typically exhibits a brightness of 85-92% on the ISO scale, with particle sizes adjustable between 50-300 mesh. Its calcium content ranges 35-38%, with impurities including 1-3% organic residues and <0.5% silica. The crystalline structure is primarily calcite, though some aragonite may persist depending on source species. Chemically, it behaves like standard calcium carbonate but with higher porosity due to the natural shell microstructure. This enhances reactivity in soil and water applications. When heated above 825°C, it decomposes into calcium oxide (quicklime), releasing CO₂. In acidic environments, it neutralizes acids while releasing calcium ions.
Main Applications
In agriculture, it serves as a slow-release fertilizer for calcium-deficient crops like tomatoes and apples, applied at 500-2000 kg/ha. Aquaculture operations use 50-100 ppm doses to stabilize water hardness for shrimp and mollusk farming. The poultry industry incorporates 1-3% into feed for eggshell strengthening. Industrial uses include as a filler in biodegradable plastics (10-20% loading) and in paper coating formulations. Recent innovations employ nano-sized shell powder in water purification systems due to its heavy metal adsorption capacity. Unlike mined limestone, its organic matrix may enhance soil microbial activity.
Safety and Storage
While non-hazardous per GHS standards, the fine powder requires dust control measures during bulk handling. NIOSH recommends N95 masks when airborne concentrations exceed 5 mg/m³. Storage silos should maintain relative humidity below 60% to prevent caking. For food-grade applications (e.g., feed additives), shells must undergo UV sterilization and heavy metal testing (lead <2 ppm, cadmium <1 ppm). Transportation requires waterproof packaging, typically 25kg woven PP bags with inner liners for moisture protection. Shelf life exceeds 2 years if stored properly.
B2B Procurement Guide
Key specifications to request include: CaCO₃ content (≥90% for premium grade), loss on ignition (LOI <2% indicates low organic content), and particle size distribution (D50 value). For soil applications, seek 80-120 mesh powders; industrial uses may require 200+ mesh. Verify suppliers conduct XRD analysis to confirm mineral composition and ICP-MS for heavy metals. Coastal processors often offer logistical advantages. MOQs typically start at 20 tons for bulk orders, with spot prices fluctuating seasonally based on shellfish processing cycles. Consider FOB pricing from major producers in Southeast Asia or Europe.
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