Grading · Model FQFD
Purifier
The machine that separates a good flour from a great one.
- 60+ years manufacturing
- 10–500 t/d capacity range
- 100+ patents
- Turnkey commissioning
What it does
A purifier stratifies middlings on a vibrating sieve under an air stream. Pure endosperm, being lighter and more angular, floats and travels; bran-contaminated particles of the same size settle and are rejected. This is how a mill produces genuinely low-ash patent flour instead of merely sifting what the rolls produced.
Technical parameters
Nominal values at standard conditions. Confirm final specification on the order drawing.
| Model | Coarse fraction (t/h) | Fine fraction (t/h) | Power | Air volume (m³/h) | Weight | Dimensions (mm) |
|---|---|---|---|---|---|---|
| FQFD49×2×3 | 1.4–2.8 | 0.6–1.4 | 0.18 × 2 kW | 40–70 | 970 kg | 2700 × 1290 × 1700 |
| FQFD59×2×3 | 1.8–3.5 | 1.2–2.0 | 0.25 × 2 kW | 50–85 | 1,100 kg | 2700 × 1500 × 1800 |
Selection guidance
A purifier is only worth installing if you have at least 4 break passages — with less, there is not enough middlings to purify and the machine sits idle. Below 40 t/d, most plants skip it; at 40 t/d and above it becomes the difference between 65% and 73% patent extraction.
Maintenance
Air balance is everything. Re-balance the aspiration hoods every 6 months and after any change to the flow sheet. Sieve frames are consumable — replace when the mesh sags.
Answers
Frequently asked questions
Straight answers to the questions engineers and mill owners actually ask us during plant sizing. If your case is not covered, send the wheat specification and your target tonnage.
Ask an engineer →- Can I add a purifier to an existing plant?
- Only if the flow sheet has enough middling streams to feed it. Retrofits usually require adding a break passage at the same time, which is why the decision is best made at initial design.
- How much ash does a purifier remove?
- Typically 0.08–0.15 percentage points from the purified stream, and it enables a 5–8 point increase in patent extraction at the same ash specification.
Next step
Send your tonnage. Get a flow sheet in 12 working hours.
Send us: daily capacity target, wheat type and quality, available building dimensions, and local power supply. We reply within 12 working hours with a preliminary flow sheet, equipment list and budget range — no obligation.