FeSi 45 / 65 / 75
Atomized FeSi15 for DMS plants with magnetic recovery certification; milled FeSi for steel and foundry; low-Al Pidgeon grade. Annual plant contracts.
QUICK ANSWER
Ferrosilicon powder is an iron-silicon alloy (45%, 65%, or 75% Si) milled to 45-250 µm grades, serving three industries: as the dense medium in heavy-media separation plants (atomized FeSi 15% is the mineral processing standard), as a deoxidizer and silicon alloying addition in steelmaking and foundry, and as the raw material for magnesium production via the Pidgeon process.
Ferrosilicon's personality changes completely with form and grade: atomized spherical FeSi15 suspends in water to create dense-media baths (density 2.8-3.2 g/cm³) that float coal and sink rock — the separation technology behind most coal washing and much diamond and iron ore processing. Milled FeSi75 powder doses silicon into steel and cast iron as deoxidizer and inoculant. And FeSi75 is the reductant that pulls magnesium from dolomite in Pidgeon-process magnesium plants. Each market buys different grades and size specifications on certified silicon content and, for dense media, magnetic recovery properties.
MATERIAL DATA
Lot-level controls focus on the chemistry, particle characteristics, and process values that influence manufacturing consistency and finished-part performance.
| Element | Content | Performance Role |
|---|---|---|
| Silicon (Si) | 45 / 65 / 75 wt% (grade) | The functional element — deoxidation, alloying, reduction power |
| Iron (Fe) | Balance | Carrier matrix and magnetic recovery enabler |
| Aluminum (Al) | < 2.0 wt% | Impurity limit — affects steel quality and Pidgeon efficiency |
| Calcium (Ca) | < 1.0 wt% | Controlled residual from smelting |
| Carbon (C) | < 0.2 wt% | Low carbon for steelmaking grades |
Final limits can be aligned with the agreed purchase specification.
APPLICATIONS
Dense media separation is the precision market: coal preparation plants, diamond recovery plants, and iron ore beneficiation circuits suspend atomized FeSi15 powder in water and cyclone or bath-separate valuable material from waste by density. The powder must be spherical (low viscosity medium), fine (stable suspension), and magnetic (recovered by drum magnets at 99+ percent efficiency). Plant operators buy on medium stability testing, magnetic recovery rate, and consumption per tonne — a specification-locked purchase where off-spec powder destabilizes the entire separation circuit.
Metallurgy is the tonnage market: steel mills and foundries use FeSi75 powder and granules for deoxidation and silicon alloying; cast iron producers use it as inoculant base; and Pidgeon-process magnesium smelters (concentrated in China) consume FeSi75 as their reductant in enormous tonnage. Welding electrode coatings, mineral processing reagents, and hydrogen generation chemistry (FeSi + NaOH) add diversified smaller streams — all buying on certified silicon content with contract volumes tied to production rates.
CHEMICAL & METALLURGICAL PROCESS POWDERS
CUSTOM SUPPLY
We supply the full ferrosilicon range: atomized spherical FeSi15 for dense media plants (with medium-stability and magnetic-recovery certification), milled FeSi45/65/75 for metallurgy, and Pidgeon-grade FeSi75. Custom size distributions for specific cyclone and bath designs, low-aluminum premium grades, and annual plant supply contracts are available. Not export-controlled.
We supply the full ferrosilicon range: atomized spherical FeSi15 for dense media plants (with medium-stability and magnetic-recovery certification), milled FeSi45/65/75 for metallurgy, and Pidgeon-grade FeSi75.
Custom size distributions for specific cyclone and bath designs, low-aluminum premium grades, and annual plant supply contracts are available.
MATERIAL COMPARISON
| Comparison Point | This Product | Milled FeSi |
|---|---|---|
| Particle shape | Spherical | Angular |
| Medium viscosity | Low — clean separation | High — viscosity blinds separation |
| Suspension stability | Excellent | Poor — settles and surges |
| Ferrosilicon consumption | Lower | Higher (losses) |
| Price | Higher | Lower |
| DMS circuit fit | Cyclones and baths — the standard | Unsuitable for modern circuits |
TECHNICAL FAQ
Need a different chemistry, particle range, or processing route? Our material team can review the requirement and supply window.
Atomized FeSi15 (14-16% Si) at D50 45-75 µm is the cyclone standard; coarser cuts suit baths. The critical certified values are magnetic susceptibility (recovery), size distribution (viscosity), and corrosion resistance (medium life) — all provided per lot.
Well-run circuits consume 0.2-0.5 kg per tonne of ore; above that signals recovery or medium-stability problems, often powder-related. Our technical team helps diagnose medium circuit losses against powder specifications.
FeSi75 with aluminum below 1.5-2.0 percent — aluminum content directly costs magnesium yield. Our Pidgeon-grade lots ship with certified Si/Al and reduction-efficiency reference data.
Yes — FeSi75 with controlled Ca/Al for cast iron inoculation, in the fine size cuts inoculation practice requires, plus barium-bearing inoculant variants.
No. Ferrosilicon in all grades ships without licensing requirements.
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