PULVERIZING MILL TYPE "SF"

PRODUCT DESCRIPTION
These kind of micronizers show a high efficient grinding effect based on a combined impact and shear action due to:
• High speed (80÷115 m/s)
• Large grinding surface with small gap between rotor and armours
• Special multistage rotor with blades
The process flow sheet shows the working of the installation with mill “SF” in the most common applications.
The material is fed into the lower part of the mill by a screw feeder and is ground by a combined action of shear, impact and violent turbulent motions created by the special shape of the rotor and of the grinding elements.
The ground product, swept upwards by the air flow, is classified by the separator placed in the higher part of the mill.
The fine material is discharged upwards and collected into a filter, while the reject of the separator is recycled into the mill .
Depending on the raw materials, it’s possible to design the plant with cooling system, drying equipment, inert gas in close circuit.



APPLICATION FIELDS
• Fine grinding of non abrasive materials
The SF mills are suitable for producing very fine air selected powders of a lot of medium hard and medium abrasive materials.
The high fineness obtainable with these mills makes them suitable for producing directly the required powders in the fineness range 98÷99% minus 40 micron and/or 90÷98% minus 20 micron, or to feed microclassifiers to produce powders minus 5÷20 micron.
The SF Mills can be fed with granulated materials or powders up to 2÷10 mm., however the SF mills can refine efficiently even materials with feed size less 1 mm.

• Production of coated calcium carbonate As special application we mention the post treatment for the production of coated calcium carbonate with stearic acid

• Micronizing of coarse cereals
SF mills are suitable for fine grinding of cereals lower than 300 microns and specially, for the post treatment of coarse coming from sieves.

• Micronizing of rubber and plastic raw materials (PVC, PE, white rubber, etc.)
For these applications the shear action is essential
Cooling of grinding room is necessary in certain cases.

• Other applications
- chemicals
- guar splits
- metal oxides
- pesticides
- various industrial waste for separation of different components for instance copper and PVC from electric wires



CONSTRUCTION FEATURES
• Housing in welded steel plates with inspection doors
• Armours composed of interchangeable elements designed for maximum shear or impact effects depending on specific application
• Multistage plates rotor in welded steel heat treated, dynamically balanced.
• Blade-type hammers in wear resistant alloy, reversible
• Cr.Ni shaft turning on special ball bearings, grease lubricated by automatic system.
• Construction material: carbon steel or stainless steel.

TECHNICAL DATA

TYPE		SF 75	SF 100
Rotor’s diameter	Mm	750	1000
Rotor’s stages		3÷4	3÷6
Speed	Giri/I Rpm	2200÷3000	1500÷1800
Required power	KW	55÷75	90÷132
Air Capacity	Mc/ora	2000÷3000	5000÷6000
Weight	Kg	3500	5000

Data and features may change without any previous advice.

DOWNLOAD TECHNICAL DATA SHEET