Overview
Highly Reactive Sponge Iron is produced by direct reduction of iron ore without melting, resulting in a porous structure with high surface area. Its unique physical form enhances chemical reactivity compared to conventional iron forms. Primarily used as a feedstock in electric arc furnaces for steel production, it also serves as a reducing agent in chemical processes and an effective medium for heavy metal removal in wastewater treatment. The material's sustainability (lower CO₂ emissions than pig iron) has driven adoption in green metallurgy.
Physical and Chemical Properties
The material's honeycomb structure provides 30-50% porosity, with typical bulk densities around 2.5-3.5 g/cm³. Surface areas range 0.5-2 m²/g, enabling faster reaction kinetics than solid iron. Chemically, it contains 90-95% metallic iron with residual oxides (FeO, Fe₂O₃). The high purity version (>98% Fe) commands premium pricing. Its reducibility (measured by weight loss in hydrogen) typically exceeds 90%, making it effective for oxygen scavenging applications.
Main Applications
In steelmaking, sponge iron substitutes scrap metal in EAFs, particularly in regions with limited scrap availability. The automotive industry prefers it for low-residual steel production. Environmental applications include groundwater remediation (arsenic/hexavalent chromium removal) and industrial wastewater treatment. Its gradual iron release makes it superior to conventional coagulants. Chemical manufacturers use it as a reducing agent for nitro compounds and dye intermediates.
Safety and Storage
As a pyrophoric material when finely divided, sponge iron requires inert gas storage or moisture-controlled packaging. NFPA rates it as Health: 1, Flammability: 1, Reactivity: 1. Bulk storage should avoid humidity above 60% RH to prevent exothermic oxidation. Fire suppression systems should use Class D extinguishers for iron fires. Workers need PPE against iron dust inhalation (TLV 5 mg/m³ respirable fraction).
B2B Procurement Guide
Industrial buyers should specify: metallization degree (>92% for steelmaking), carbon content (0.5-2% for EAF use), and gangue (SiO₂+Al₂O₃ <6%). Packaging options include 1-ton bulk bags with nitrogen purging or 50kg moisture-proof drums. Quality certifications to request: ISO 4700 (cold compression strength), ISO 4695 (low-temperature reduction disintegration). Leading producers are concentrated in India, Russia, and Iran, with regional suppliers offering just-in-time delivery to minimize oxidation risks.
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