RETSCH / CROSS BEATER MILL

SK 300.
Brittle materials. A defined preparation route.

Cross-beater impact grinding for medium-hard, brittle samples. Explore mineral, glass and ceramic preparation with adjustable speed, interchangeable bottom sieves and tool-material options.

Discuss SK 300 Technical data

Configurations and accessories shown may be optional.

FEED SIZE*< 25 mm

FINAL FINENESS*< 100 µm

SPEED2,000–4,000 rpm

THE MODEL IN FOCUS

Medium-hard, brittle mineral, glass and ceramic sample preparation.

Use cross-beater impact

Material is reduced between the cross beater and toothed grinding insert, with discharge governed by the bottom sieve.

Adjust the operating point

Speed is selectable in 200 rpm steps. Bottom sieve openings range from 0.12 to 10 mm.

Match the wear material

Review stainless, hardened steel, cast iron or the specified heavy-metal-free grade against wear and analytical limits.

Choose collection and access

Push-fit components support cleaning. Gravity collection and optional cyclone systems provide different discharge arrangements.

*Published feed limits, fineness and throughput depend on the material, sieve, speed and configuration. Sieve aperture is not the final particle size, and maximum throughput and finest output are not simultaneous guarantees.

FUNCTIONAL PRINCIPLE

How SK 300
works.

Feed reaches the center of the chamber and is struck by the cross beater, then reduced against the toothed insert. Particles pass through the bottom sieve when sufficiently small and leave through the outlet. Airflow and an optional cyclone help transport and collect the material.

Match sample behavior and feed dimensions
Choose the actual sieve, speed and contact materials
Validate the output with a representative trial

SK 300 operating components or configuration example — Configuration example; confirm the accessories and arrangement.

PUBLISHED TECHNICAL DATA

The technical
picture.

SK 300: cross beater mill for medium-hard, brittle samples.

Published feed limits, fineness and throughput depend on the material, sieve, speed and configuration. Sieve aperture is not the final particle size, and maximum throughput and finest output are not simultaneous guarantees. Confirm current electrical and installation requirements before ordering.

Maximum feed size*: < 25 mm
Final fineness*: < 100 µm
Speed at 50 Hz (60 Hz): 2000 - 4000 min-1 (in steps of 200 min-1)
Speed setting: yes
Collector capacity: 5 l / optional: 30 l
Drive power: 1.1 kW
Power consumption: 1.5 kW
W x H x D closed: 600 x 1200 x 700 mm (with base frame)
Net weight: ~ 60 kg (with base frame)

All other specifications

Applications: size reduction
Field of application: agriculture, chemistry / plastics, construction materials, environment / recycling, geology / metallurgy, glass / ceramics
Feed material: medium-hard, brittle
Rotor peripheral speed: 15.5 m/s .. 31 m/s
Types of rotors: stainless steel / cast iron
Material of grinding tools: hardened steel, stainless steel, cast iron, steel 1.1740 (for heavy-metal free grinding)
Sieve sizes: trapezoid holes 0.12 / 0.20 / 0.25 / 0.35 / 0.50 / 0.75 / 1.00 / 1.50 / 2.00 mm round holes 3.00 / 4.00 / 5.00 / 6.00 / 8.00 / 10.00 mm
Dust extraction unit: optional cyclone
Drive: 3-phase motor with frequency converter
Electrical supply data: 200-240 V, 50/60 Hz
Power connection: 1-phase
Protection code: IP 41
Remark weight (without hopper etc.): ~ 50 kg (without base frame)
Standards: CE

CONFIGURE THE WORKFLOW

The options shape
the result.

Grinding tools & sieve selection

Choose the rotor and insert material for the sample. The published list includes hardened steel, stainless steel, cast iron and steel 1.1740. A named heavy-metal-free grade does not remove every contamination pathway.

Collection, feeding & cyclone

The technical specification lists a 5 L collector with an optional 30 L vessel. Discuss feeding and cyclone options for the complete installation; cassette volumes quoted for ZM 300 are not SK 300 capacities.

Cleaning & repeatability

The grinding insert, cross beater and sieve can be exchanged for cleaning and application changes. Document the actual speed, sieve, tool material and sample-feeding method.

TYPICAL MATERIALS

Start with your sample.

Examples guide the discussion; they do not guarantee a result for every material or formulation.

Minerals & ores
Glass
Cement clinker
Oxide ceramics
Coal & coke
Gypsum & soils

Explore materials & applications

MODEL APPLICATION REVIEW

Put SK 300
to the material test.

Share the starting size, desired fineness and quantity to process. We’ll review the milling route, tools, collection and opportunities for a material trial.