Hammer Mill Specifications
The figures below describe typical industry specifications for this class of equipment rather than a single fixed model. Use them to scope a requirement, then confirm exact figures against the supplied unit before purchase.
| Specification | Typical value |
|---|---|
| Throughput | 1–15 t/h for small-scale gold duty |
| Feed size | ≤30–50 mm typical; some diesel units take 100–150 mm |
| Discharge screen | 0.8–12 mm slotted or round, interchangeable |
| Drive | Electric 7.5–45 kW, or 10–30 hp diesel |
| Rotor speed | 1,500–3,000 rpm |
| Hammers | Manganese or chrome, reversible |
| Moisture limit | Generally <8–10%; wet sticky feed blinds the screen |
| Fuel (diesel units) | 3–8 L/h |
What a Hammer Mill Is Used For
- Small-scale hard-rock gold crushing
- Recrushing jaw product ahead of a shaking table
- Sample preparation
- Dry crushing where water for milling is scarce
Maintenance Schedule
Most premature failures in this equipment class trace back to a missed routine check rather than a design fault. The intervals below are a practical starting schedule; adjust them to your duty cycle and the manufacturer manual.
| Interval | Task |
|---|---|
| Every shift | Check for unusual vibration; inspect screen for blinding or holes; confirm feed is not oversize. |
| Daily | Inspect hammers and breaker plate; reverse hammers when one edge is worn. |
| Weekly | Bearing temperature and lubrication; inspect rotor pins. |
| On wear | Replace hammers as a set to keep the rotor in balance. Mixing new and worn hammers destroys bearings. |
Frequently Asked Questions
Hammer mill or ball mill for small-scale gold?
A hammer mill is a crusher, not a mill. It gets rock down to millimetres; a ball mill or wet pan mill gets it to the microns needed to liberate gold. Use a hammer mill after a jaw and before gravity recovery when you do not yet have a ball mill, or as a dry crushing step. It does not replace grinding on hard-rock ore.
Why does my hammer mill screen blind?
Wet or clayey feed, or a screen too fine for the moisture. Hammer mills are dry crushers. If the ore is wet, dry it, blend it, or switch to a wet mill. A blinded screen overloads the rotor and trips or breaks hammers.
How long do hammers last?
From a few days in abrasive quartz-rich ore to several weeks in softer oxide. Track tonnes per set. Reverse them once, then replace the full set. Unbalanced rotors are the usual cause of bearing failure.
Supply and Delivery Across Tanzania
Bart Mining supplies hammer mill and related equipment to mining operations throughout Tanzania, with primary coverage of the Lake Victoria Goldfields (Mwanza, Kahama, Geita, Shinyanga and Bukombe), alongside the Lupa Goldfields around Chunya and Mbeya, and delivery nationwide from Dar es Salaam.
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