PM / LPMG Series Pin Mill Crushing System

The PM and LPMG Series form a pin mill crushing system for dry fine grinding down to submicron D50. Rotating and fixed pin discs crush particles through repeated impact, shear, and friction — no grinding media, no solvents. The horizontal PM covers laboratory trials at 0.1–10 kg/h without a classifier; the vertical LPMG adds a classifier wheel and scales from pilot to production at 1–400 kg/h, with -80°C cryogenic gas and closed-loop nitrogen operation available.

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Specifications

PM Series — Horizontal Pin Mill (Laboratory)

Model	Scale	Throughput	Max Speed	Main Motor	Feed Size	Product D50
PM-50	Lab	0.1–1 kg/h	35,000 rpm	0.75 kW	≤3 mm	3–20 µm
PM-100	Lab / small pilot	0.5–10 kg/h	22,000 rpm	5 kW	≤3 mm	3–20 µm

LPMG Series — Vertical Pin Mill with Classifier (Pilot to Production)

Model	Scale	Throughput	Max Speed	Main Motor	Product D50	Inlet Gas Temp
LPMG-100	Pilot	1–10 kg/h	22,000 rpm	5 kW	0.5–30 µm	-80~30°C
LPMG-160	Pilot / Production	5–50 kg/h	18,000 rpm	11 kW	0.5–30 µm	-80~30°C
LPMG-300	Production	20–100 kg/h	11,000 rpm	20 kW	0.5–30 µm	-80~30°C
LPMG-500	Production	50–400 kg/h	6,000 rpm	55 kW	0.5–30 µm	-80~30°C

Operating Principle

Both series share the same pin mill crushing core. A high-speed rotor disc turns against a fixed stator disc inside a sealed chamber; feed enters at the center and is drawn in by negative pressure. Pin tip speed increases from the inner row to the outer row, so particles are crushed progressively finer by impact, shear, and friction, then struck again on the chamber-wall impact ring.

Pin mill rotor and stator disc components used in both PM and LPMG series — Rotor and stator pin discs — the shared crushing core of the PM and LPMG series

PM Series

In the horizontal PM, crushed powder discharges radially by centrifugal force in a single pass — no classifier wheel. Product fineness is set by rotor speed and feed rate, which keeps the machine simple to clean and fast to turn around between lab samples.

PM Series — horizontal single-pass grinding, no classifier

LPMG Series

In the vertical LPMG, rising airflow carries crushed powder up to a variable-frequency classifier wheel above the grinding zone. Fine particles pass the wheel into the collector; coarse particles fall back for further grinding. Changing the wheel speed alone changes the cut size, so product D50 is controlled independently of the grinding rotor — from 0.5 to 30 µm.

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LPMG Series — vertical grinding with classifier wheel and coarse-particle recirculation

PM vs LPMG at a Glance

	PM Series	LPMG Series
Orientation	Horizontal	Vertical
Classifier wheel	None — single-pass radial discharge	Yes — VFD cut-size control, coarse recirculation
Product D50	3–20 µm	0.5–30 µm
Scale	Lab, 0.1–10 kg/h	Pilot to production, 1–400 kg/h
Cryogenic option	—	Inlet gas to -80°C, no liquid nitrogen
Atmosphere	Air	Air or closed-loop N₂ with O₂ monitoring
Typical role	Feasibility trials, sample prep	Scale-up and continuous production

Key Features

Media-free impact grinding — no bead or ball contamination in the product
Same pin-disc geometry across both series — lab results on PM transfer directly to LPMG scale-up
Classifier wheel on LPMG cuts D50 anywhere from 0.5 to 30 µm without hardware changes
Cryogenic module supplies -80°C inlet gas by mechanical refrigeration — no liquid nitrogen consumption
Closed-loop nitrogen circuit with on-line oxygen monitoring for oxidation-sensitive or combustible powders
316L stainless contact parts, GMP-compliant; wear-resistant disc options including TC4 titanium alloy

Experiment Results

Ferrous Oxalate (Sodium-Ion Battery Precursor) Grinding — PM-50
Feed: ferrous oxalate precursor powder for sodium-ion cathode synthesis.
Result: single-pass D50 = 4.44 µm, D90 = 12.53 µm, D97 = 18.43 µm.

Particle size distribution report for ferrous oxalate ground on PM-50, showing D50 4.44 micrometers — Ferrous oxalate on PM-50 — D50 4.44 µm, single pass

Porous Carbon Grinding — PM-50
Feed: petroleum-coke-based porous carbon.
Result: D50 = 3.52 µm, D90 = 6.05 µm, D97 = 7.19 µm, span 1.26 — a narrow, unimodal distribution.

Particle size distribution report for porous carbon ground on PM-50, showing D50 3.52 micrometers — Porous carbon on PM-50 — D50 3.52 µm, narrow span

Selected Verified Results Across the Series

Material	Machine	Feed D50	Product D50	Product D97	Condition
Lithium iron phosphate	PM-50	10.72 µm	0.77 µm	3.77 µm	Ambient
Titanium dioxide	PM-50	103.7 µm	0.815 µm	9.10 µm	Ambient
Lithium iron phosphate	LPMG-100	10.72 µm	0.804 µm	2.51 µm	Ambient
Solid electrolyte	LPMG-160	48.96 µm	1.349 µm	3.98 µm	Cryogenic, N₂
Lithium sulfide	LPMG-160	3.454 µm	0.886 µm	2.53 µm	Cryogenic, N₂
Toner	LPMG-160	219 µm	10.94 µm	21.13 µm	Cryogenic

Applications

Lithium battery cathode materials — LFP and cobalt oxide ultrafine grinding to submicron D50
Sodium-ion battery precursors — ferrous oxalate, sulfates, and organic precursors at lab scale
Carbon materials — porous carbon and hard carbon milling with narrow span control
Solid-state electrolytes — sulfide electrolytes ground under closed-loop nitrogen at -80°C
Pharmaceuticals and food powders — GMP-compliant contact parts; cryogenic grinding for heat-sensitive materials
Non-metallic minerals and ceramics — calcium carbonate, alumina, and titanium dioxide fine grinding

Enquiry

Tell us your material, target particle size, and throughput. We will advise on
model selection and run a trial on your own powder before you commit to equipment.

Yibin Andy Wei — Application Engineer
Email: [email protected]
LinkedIn: Yibin Andy Wei
WhatsApp: +1 380 900 2442

Call Us or Fill the Form

Jessie Yao
+86-510-83390800
+86 18921109791(Wechat)
[email protected]
C2, Quantum Industrial Park, Qianzhou Street, Huishan District, Wuxi City, Jiangsu, China

CRUSHING