Grinding & Milling¶

Process Objective¶

Reduce flaxseed kernel or whole seed to controlled particle sizes for powder production, with optional cryogenic grinding for heat-sensitive applications.

Equipment Configuration¶

Feed → Metal Detector → Grinding Mill → Pneumatic Convey → Sifter → Cyclone Collector → Powder Silo

Milling Technologies¶

Mill Type	RPM Range	Screen	Throughput	Heat Rise	Application
Hammer mill	2800–3600	0.8–3.0 mm	1.0–2.0 MT/hr	10–15°C	Standard grinding
Disc mill	1200–1800	Adjustable gap	0.5–1.0 MT/hr	8–12°C	Coarse grinding
Pin mill	6000–12000	Fixed	0.3–0.8 MT/hr	12–18°C	Ultra-fine powder
Cryogenic mill	3000–4500	0.5–2.0 mm	0.2–0.5 MT/hr	–150°C	Full-fat, heat-sensitive

Cryogenic Grinding¶

Parameter	Value
Liquid N₂ consumption	1.5–2.5 kg N₂ / kg product
Product temperature	–80 to –150°C
Oil retention	98% of native (vs. 92% at ambient)
Peroxide value (fresh)	< 1.0 meq/kg (vs. < 2.0 meq/kg ambient)
Particle size	D50 30–80 µm (hammer: 200–400 µm)

Particle Size Control¶

Target Mesh	Mill Type	Screen / Setting	D50 (µm)
20	Hammer	3.0 mm	500
30	Hammer	2.0 mm	350
40	Hammer	1.2 mm	250
60	Pin	—	150
80	Pin / Cryo	—	100
100	Cryo	—	75

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