Feed-Grade Limestone (Calcium Carbonate)

Description

1. Product Overview

Feed-Grade Limestone (Calcium Carbonate) is a high-purity, micronized mineral additive specifically manufactured for animal nutrition formulations. Its primary industrial use is as a cost-effective, bioavailable calcium source to support skeletal integrity, eggshell quality, and metabolic function in livestock and poultry production. The key value proposition lies in its consistent particle size distribution, low heavy-metal profile, and enhanced digestibility, which directly improve feed conversion ratios (FCR) and reduce mortality losses. Strategically, this product is indispensable for industrial feed mills aiming to meet stringent global food safety standards while optimizing total cost of ownership in ration balancing.

2. Key Specifications & Technical Characteristics

• Chemical Composition: ≥ 38% Calcium (Ca); ≤ 0.5% Magnesium (Mg); ≤ 0.02% Iron (Fe) as Fe₂O₃

• Purity Level: ≥ 98.5% Calcium Carbonate (CaCO₃) on dry basis; food-grade impurity limits (As ≤ 2 ppm, Pb ≤ 5 ppm, Cd ≤ 1 ppm)

• Physical Characteristics: Fine off-white to light-grey powder; particle size: 100% passing 100 mesh (150 µm), with 60% retained on 200 mesh for optimal gizzard retention in poultry

• Bulk Density: 1.2 – 1.4 g/cm³ (loose); 1.6 – 1.8 g/cm³ (tapped)

• Packaging Options: 25 kg multi-wall kraft paper bags; 1.0 MT polypropylene jumbo bags; dedicated pneumatic tanker truck (uncompressed) for direct silo feeding

• Shelf Life: 24 months from production date when stored below 60% relative humidity in original unopened packaging

3. Core Industrial Applications

• Primary Industries: Commercial poultry layer operations, swine nursery/finisher units, ruminant total mixed ration (TMR) producers, and aquaculture feed manufacturers.

• Specific Operational Use Cases:

  • Layers & Breeders: Incorporation at 8–10% of feed formulation to maximize eggshell breaking strength and reduce shell-translucency defects.

  • Swine: Used at 0.5–1.2% in grower/finisher diets to prevent leg weakness and optimize bone ash density.

  • Ruminants: As a rumen buffer and calcium source in high-concentrate finishing rations to prevent hypocalcemia.

• Why This Product Performs Better: Uniform particle-size distribution ensures gradual calcium release in the digestive tract versus abrupt gastric passage of coarser or finer limestone. Lower acid-insoluble ash (AIA ≤ 1%) guarantees higher soluble calcium, reducing supplemental phosphorus needs by 3–5%. This delivers a direct feed cost reduction of $1.50–$2.00 per metric ton of finished feed compared to low-grade regional alternatives.

4. Competitive Advantages

• Quality Consistency: ISO 22000:2018 certified manufacturing; every lot tested via ICP-OES for 12 heavy metals; statistical process control (SPC) ensures ≤2% RSD in calcium content across shipments.

• Supply Reliability: Dual-sourced quarrying from Devonian and Jurassic limestone strata; dedicated 40,000 MT on-ground buffer stock; 98.5% on-time-in-full (OTIF) delivery record over 36 months.

• Logistics Capability: Multi-modal shipping (bulk vessel, rail hopper, pneumatic tanker) to all global protein-production regions; demurrage risk guarantee covering supplier-caused port delays.

• Price Competitiveness: Long-term mining royalties and vertical milling integration yield pricing 12–15% below regional index for 98.5% purity grade.

• Sustainability Benefits: Zero-discharge wash water recycling; SCS-certified recycled calcium content (18% from pre-consumer marble processing); carbon footprint verified at 0.06 kg CO₂e per MT.

• Technical Support: Full toxicological dossier, residue analysis protocol, and custom particle size blending (100–600 µm) available; FCR modeling included with volume contracts.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): 20 MT (one bulk full truckload or 800 × 25 kg bags)

• Bulk Loading Capacity Per 20ft Container: 25 MT net weight (jumbo bags on pallets, floor-loaded)

• Bulk Loading Capacity Per 40ft Container: 28 MT net weight (jumbo bags or pneumatic discharge liner system)

• Lead Time: 10 days from order confirmation for spot orders (any packaging); 30 days for dedicated particle size blends

• Incoterms Supported: FOB (loading port), CFR, CIF (major global feed terminals), EXW (quarry/mill)