Air Classifying Mill (Micronizer)
Air Classifying Mill (Micronizer)
NSI Equipments Pvt. Ltd. Micronizer Systems
incorporated a wide range of standard features which can address a wide
range of applications. We took steps to assure that our customers are able
to source the best mill design for their application.
Air Classifying Mill (ACM) is a compact micronizer
and clear arrangement of element with the combination of air swept impact
grinding with integral dynamic classification used for fine and micro-fine
size reduction of a wide range of products in all industries like Chemical,
Mineral, Pharmaceutical, Food, Metal etc. Rejection of coarse material
requiring further size reduction occurs totally inside the chamber by means
of a positive material and air transport system. This feature combined with
vertically orienting the classifier and impact drive shaft makes the air
classifying mill the most efficient type of mechanical mill available.
The material to be ground is introduced to the tip
of the rotating hammers through a port opening at the side of the mill. Feed
material can be either pneumatically conveyed or screw fed. The rotating
hammers attached to the impact rotor disc serve to fracture the process
material with a striking edge velocity up to 140m/s.
A serrated liner mounted on the periphery of the grinding chamber in the
hammer path serves to improve grinding efficiency by preventing particles
from accelerating to the speed of the hammers thereby increasing the
relative speed difference.
The primary airflow passing through the narrow
annular gap formed in between the liner and impact rotor disc in conjunction
with the fanning action of the hammers transports the material to the top of
the mill. A dispersion ring then directs the material downward toward the
classifier. Baffles welded to a shroud ring straighten the flow of material
and air so that particle overtaxing at the dispersion ring area is avoided.
The shroud assembly effectively separates the grinding zone from the
classification as well as providing a defined path for the material and air
to flow through.
Depending upon the air flow rate and separate speed adjustment, discreet
particles are acted upon by either the center seeking drag force of the air
that flows through the classifier or center fleeing centrifugal force
created by the turning of the classifier wheel. Rejected particles fall by
gravity and are pulled under the shroud assembly to the spinning hammers for
The Mill operates on the principle of IMPECT
GRINDING and usually employs rotor speed with a striking velocity of 140
m/s. Size reduction takes place by the impact of material particles on the
rotating grinding surface and on the fixed liner.
The characteristic feature of the ACM is the
incorporation of a integral classifier. The classifier works on the
principle of two opposite force acting on the different particles, the
coarse and the fine particles are segregated.
CLEANING & MAINTENANCE
ACM is designed in such a way that all the
individual components of the mill viz. the shroud ring, the liner plate, the
classifier and the rotor plate are easily detachable for cleaning, in case
of product change and for maintenance work. The top lid is hinged and
tightened with fly nuts.
Our air classifying mills incorporate the following
- Units up to 100 HP have standard cast reversible Ni-Hard liners
- Tungsten carbide hammers.
- All mills are designed to operate at noise levels below 85 dba*
- A complete line of sanitary mills is available to meet special
- Grinding and classifying in one machine
- Steep particle size distribution
- Sharp classifier cut point, instantly adjustable
- Low specific energy requirements
- Compact space saving design
- Economical, efficient recovery of fine powders
- Particle size readily adjustable without shutdown
- Simple to clean, maintain and operate
- Low grinding temperature
- Efficient transportation of ground material from grinding rotor to
- Oversize material rejected back to grinding rotor
- Precision manufacturing
- Wide model range for broad application considerations
Air Classifying Mill grinding system consists of the
- Feed Hopper
- Screw/Pneumatic Feeder with Rotary Air Lock
- Air Classifying Mill
- Reverse Pulse Jet Bag Filter
- Discharge Rotary Air Lock
- ID Fan
- Inter Connecting Duct Work
- Control Panel
ACM can be used for almost the whole field of size
reduction of products upto a hardness of 4 Moh. Due to high air flow rates,
the material has less tendency to heat-up and suitable for heat sensitive
product size reduction. Our ACM design makes them ideal for the following
Food and Food Ingredients
Sugars, starches, artificial sweeteners, salt,
spices, thickening agents (guar, carrageen, xanthan, gelatin, alginates, and
pectin), cocoa press cake, proteins, soy, grains, lactose, peas, fish, corn,
rice and shrimp meals, cellulose, confectionery crumb, etc.
Bovine and shark cartilage, vitamins, magnesium
citrate, calcium citrate, ginseng, echinacea, chamomile, oyster shells,
psyllium, and oat hulls, etc.
Stearates, carbonates, sulphates, phosphates,
inorganic salts, rubber and plastic additives, resins, carbon black, iron
and other metal oxides, compounded powder coatings, silica gel, zeolites,
crystalline polymers, herbicides, and pesticides, etc.
Functional Fillers and Minerals
Limestone, calcined kaolin, hydrous kaolin, calcium
oxide, brucite, talc, gypsum, bentonite, wood, walnut shells, calcium
hydroxide, soda ash, trona, etc.
MATERIAL OF CONSTRUCTION
Material of construction of contact parts could be
Mild Steel, Stainless Steel etc.
||ACM - 10
||ACM - 20
||ACM - 30
||ACM - 40
||ACM - 50
||ACM - 100
|MOTOR FOR MILL
|MOTOR FOR CLASSIFIER
|SPEED FOR MILL (Max.)
|SPEED FOR CLASSIFIER (Max.)