Section 01
Overview
Iron-ore beneficiation has the highest tonnage and the tightest grade tolerance in mining. A pellet plant requires 67%+ Fe at consistent silica/alumina/phosphorus specifications, with penalty contracts attached to each specification breach. Direct-shipping-ore (DSO) operations have looser specs but operate at 5,000+ t/day, where small recovery improvements translate to large absolute tonnage gains.
Cathay supplies the full beneficiation chain: crushing, magnetic separation (wet and dry), high-pressure grinding rolls (HPGR), classification, flotation (for silica removal in some ores), and dewatering. Equipment is differentiated by the iron mineral being processed — magnetite, hematite, or limonite each demand different separator technology.
Reference deployments include hematite DSO operations in Brazil and West Africa, magnetite concentrator plants in Australia and Sweden, and limonite beneficiation pilots in Southeast Asia. Each commissioning includes Fe-grade audits at the concentrator output to verify smelter-feed acceptance.
Cathay supplies the full beneficiation chain: crushing, magnetic separation (wet and dry), high-pressure grinding rolls (HPGR), classification, flotation (for silica removal in some ores), and dewatering. Equipment is differentiated by the iron mineral being processed — magnetite, hematite, or limonite each demand different separator technology.
Reference deployments include hematite DSO operations in Brazil and West Africa, magnetite concentrator plants in Australia and Sweden, and limonite beneficiation pilots in Southeast Asia. Each commissioning includes Fe-grade audits at the concentrator output to verify smelter-feed acceptance.
Section 02
Operational Challenges
**Mineral identification.** Magnetite, hematite, and limonite require fundamentally different beneficiation strategies. Magnetite is strongly magnetic; hematite is weakly magnetic (requires high-intensity separators); limonite is non-magnetic and needs gravity or flotation. Equipment choice for the wrong ore type wastes capital.
**Silica and alumina contamination.** Steelmakers penalise high silica (>5%) and high alumina (>3%) on pellet feed. Beneficiation circuits must remove these gangue minerals through either selective grinding + screening, magnetic separation, or reverse flotation. Cathay flotation cells configured for silica reverse-flotation are a standard offering.
**Moisture management.** Iron-ore shipping contracts include moisture penalties (typically >7% draws a penalty). Concentrate must be dewatered through thickening + filtering before stockpiling. Climate-exposed stockpiles in monsoon regions require covered storage.
**Tailings volume.** Iron-ore tailings volumes are massive (often 60-70% of mass throughput). Tailings storage facility design, dry-stacking equipment, and tailings re-mining for value recovery are all part of the beneficiation system.
**Silica and alumina contamination.** Steelmakers penalise high silica (>5%) and high alumina (>3%) on pellet feed. Beneficiation circuits must remove these gangue minerals through either selective grinding + screening, magnetic separation, or reverse flotation. Cathay flotation cells configured for silica reverse-flotation are a standard offering.
**Moisture management.** Iron-ore shipping contracts include moisture penalties (typically >7% draws a penalty). Concentrate must be dewatered through thickening + filtering before stockpiling. Climate-exposed stockpiles in monsoon regions require covered storage.
**Tailings volume.** Iron-ore tailings volumes are massive (often 60-70% of mass throughput). Tailings storage facility design, dry-stacking equipment, and tailings re-mining for value recovery are all part of the beneficiation system.
Section 04
Typical Plant Setup
A representative 3,000 t/day magnetite-concentrator beneficiation plant:
1. **Primary jaw crusher** (1200×1500 mm) — ROM to 200 mm.
2. **Secondary + tertiary cone crushers** — to 25 mm.
3. **Vibrating screens** — closed circuit on tertiary crusher.
4. **Coarse ore stockpile (15,000 t)** — buffers crushing from grinding.
5. **Ball mill (4.5×8 m)** in closed circuit with **hydrocyclone** — grinds to 90% passing 75 µm.
6. **LIMS wet drum separators** (3-stage) — rougher, cleaner, scavenger. Concentrate to next stage; tails to thickener.
7. **Reverse flotation** (optional, if silica removal required) — 6 cells.
8. **Thickener (40 m diameter)** + **vacuum filter** — dewater to 8% moisture.
9. **Rotary dryer** (if pellet-feed spec requires <2% moisture) — natural-gas or oil-fired.
10. **Overland conveyor** to rail loadout or port stockpile.
Total connected power: ~6.5 MW. Site footprint: 200×80 m for process plant. Commissioning: 16-24 weeks.
1. **Primary jaw crusher** (1200×1500 mm) — ROM to 200 mm.
2. **Secondary + tertiary cone crushers** — to 25 mm.
3. **Vibrating screens** — closed circuit on tertiary crusher.
4. **Coarse ore stockpile (15,000 t)** — buffers crushing from grinding.
5. **Ball mill (4.5×8 m)** in closed circuit with **hydrocyclone** — grinds to 90% passing 75 µm.
6. **LIMS wet drum separators** (3-stage) — rougher, cleaner, scavenger. Concentrate to next stage; tails to thickener.
7. **Reverse flotation** (optional, if silica removal required) — 6 cells.
8. **Thickener (40 m diameter)** + **vacuum filter** — dewater to 8% moisture.
9. **Rotary dryer** (if pellet-feed spec requires <2% moisture) — natural-gas or oil-fired.
10. **Overland conveyor** to rail loadout or port stockpile.
Total connected power: ~6.5 MW. Site footprint: 200×80 m for process plant. Commissioning: 16-24 weeks.