Manganese Sand Filter Media (Iron & Manganese Removal)
CAS Number: 1313-13-9
Manganese sand (natural pyrolusite-coated quartz, MnO₂ ≥35%) is the catalytic filter media for iron and manganese removal from groundwater, well water, and surface water. The MnO₂ coating catalyzes oxidation of dissolved Fe²⁺ and Mn²⁺ to insoluble Fe(OH)₃ and MnO₂ which are then captured in the bed. Mined from Pingdingshan (Henan) and Guangxi deposits, grades vary by MnO₂ content (≥35%, ≥45%) and mesh size.
Technical Specifications
| appearance | Dark brown to black angular granules |
| mesh ranges | 10-20, 20-40, 8-16 (commonly stocked) |
| MnO2 content | ≥ 35 wt% (standard grade); ≥ 45 wt% (premium grade) |
| SiO2 content | ≤ 65 wt% |
| bulk density | 1.95-2.10 g/cm³ |
| Mohs hardness | ≥ 5.5 |
| particle size | 0.4-2.0 mm (mesh-dependent) |
| loss on hydrochloric acid | ≤ 2.5 wt% (24 h, 20% HCl) |
Applications
- Well water and groundwater iron removal (Fe up to 15 mg/L)
- Manganese removal in drinking water treatment (Mn up to 3 mg/L)
- Steel mill / power plant boiler feedwater pre-treatment
- Surface water clarification with high colloidal iron
- Rural and decentralized water supply (NSF/ANSI 61 grades available)
- Iron/manganese polishing after aeration or chemical oxidation
Key Features
- Catalytic MnO₂ surface — no contact time required for Fe²⁺ oxidation (vs. greensand which needs KMnO₄ regeneration)
- Self-regenerating with dissolved oxygen — no chemical addition needed for typical groundwater
- Long bed life (5-10 years typical) before media replacement
- Effective at flow rates 8-15 m/h in pressure filters
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