Chemical Engineering June 2020 - 19

Hammer mills for reducing soft
to medium-hard materials
The ideal hammer mill is determined
by feed size, feed rate, operating
conditions and desired product
output. This company offers
many configurations of industrial
hammer mill grinders (photo) that
transform the consistency of soft
and rough materials by using the
pulverizing technique of a hammer
mill grinder to produce a finished
particle. Capacities from 1 to 300
ton/h are offered with 30- to 250-hp
models. Capacities vary depending
on feed size, feedrate, operating
conditions, desired product output,
characteristics of feed material,
and equipment configuration. Perforated
screens or grate bars are
used for reducing soft to medium
hard materials with multiple sizereduction
stages. Fibrous materials
are easily handled due to the high
concentration of shearing actions
by the grate bars or screen within
the unit. Specially designed heavy
reversible
hammers,
working
in
conjunction with the company's adjustable
breaker plate, enables the
hammer mill to produce a uniform
product with the lowest possible
maintenance. - Stedman Machine
Co., Aurora, Ind.
www.stedman-machine.com
High-capacity cone mill for
sticky, moist fragile materials
A new 29.5-in.-dia. (750 mm) cone
mill, CGM 750 (photo), gently grinds
fatty, heat-sensitive, sticky, moist or
fragile materials into uniform particle
sizes with minimal fines at rates up
to 35 ton/h (32 m.t./h). Vertical material
flow and low-energy grinding
action with short residence times
yield close particle-size distribution
from 125 to 250 microns, without
the noise, dust, product build-up or
heat generation associated with traditional
mills, says the manufacturer.
Ideal
for
bulk
pharmaceuticals,
foods and contamination-sensitive
chemicals, the sanitary unit is suitable
for wet and dry milling, preconditioning
and de-agglomerating
of a wide range of bulk products.
Material is fed by gravity or vacuumconveying
system into a central
milling chamber, in which a rotating
impeller accelerates it centrifugally
against and through apertures in a
conical screen, and then into a receptacle
below the milling chamber.
A pneumatic, swing-down conical
discharge chute with quick-release
clamps allows easy lowering of
the 250-lb (114-kg) cone housing
and full access to the housing interior,
beater and perforated conical
screen for cleaning and sanitizing.
The unit can be cleaned wet or dry,
and is available configured for clean
in place (CIP), steam in place (SIP)
or filling with liquid during cleaning.
Provision is included for optional
air purging of bearings and
seals. Conical screens with round,
square or raised-lip (cheese grater)
perforations can be changed rapidly
and are offered with apertures from
150 micron for fine/dry de-agglomeration,
and up to 25 mm for wet
granulation. Constructed of 304 or
316 stainless steel to sanitary or
industrial standards, the mill is topdriven
by a belt drive and equipped
with fully interlocked moving components
with time-delay function for
operator safety. Explosion-containment
versions are also available. -
Kason Corp., Millburn, N.J.
www.kason.com
Prepare reliable, representative
samples in a very short time
The Knife Mill Pulverisette 11 (photo)
produces a homogeneous sample in
a very short time due to its special
design. Each subsample taken from
any location in the grinding vessel is
representative for the original sample
and thus ensures an exact, significant
analysis; this holds for a wide
range of different materials, regardless
of whether the sample is dry,
moist, soft, medium-hard, fibrous or
oily. The system is ideal for sample
preparation in the fields of foodstuffs
or animal feed testing, agriculture
and forestry, biotechnology, pharmaceuticals
and chemicals. The standard
knife is made of stainless steel
and can be used for comminution
of nearly all materials, due to its four
blades and geometry. For comminution
of brittle, hard samples, a sickle
knife made of stainless steel can be
used. The sickle knife with serrated
blades is ideal for grinding especially
fibrous, tough or sinewy samples,
such as fish, meat, asparagus or
bamboo. - Fritsch GmbH, IdarOberstein,
Germany
www.fritsch.de
n
Gerald Ondrey
ChemiCal engineering www.Chemengonline.Com June 2020
19
Stedman Machine Company
Kason
Fritsch
http://www.kason.com http://www.stedman-machine.com http://www.fritsch.de http://www.Chemengonline.Com
Chemical Engineering June 2020

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