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Prime Quality Optimal Purity Metallic Chemical Iron Powder for Sewage Treatment. 99%+ High Purity: Secondary reduced process ensures ultra-low impurities (O, S, P), ideal for high-quality alloy addition and steelmaking cored wires. Excellent Welding Performance: High activity 40 mesh powder improves arc stability and deposition efficiency for welding electrodes. Versatile Application: Efficient reducing agent for sewage treatment and essential raw material for powder metallurgy parts.