The Sumpter miner. [volume] (Sumpter, Or.) 1899-1905, 1901-03-06
PNEUMATIC
PULVERIZER
Machine to Take the Place Of
Stamp Mill.

snort description OF device KNOWN as
the pneumatic pulverizer, designed to do
the work of a stamp mill. Its first public
test was given at Seattle last week. The
Mining Record of that city devoteS much
space to the subject. 1t aSyS that more
that 200 mining men from all over the
Northwest were present at the time, and
manifested much satisfaction over the re.
suits attained.
The great distinguishing feature Of the
pneumatic pulverizer Is that substances
are powdered by being shot against each
other at terrific velocity by means Of op.
posing jets Of steam or compressed air.
At a pressure Of 100 pounds to the square
inch superheated steam or compressed air
Is allowed to escape through two three.
eighth.inch nozzles, directly opposed to
each other and separated by an interveh
Ing space Of some eight inches. The jets
Of air or steam then pass respectively into
and through two funnel shaped apertures
that gradually reduce to five.eighth.
inch diameter at the inner opening. The
inner openings are three inches apart,
terminating In a bowl shaped cavity.
After being reduced to the size Of peas In
an ordinary rock crusher the material to
be pulverized Is fed, from two hoppers,
into an enclosed space surrounding the
ends Of the nozzles and tunnels.
Here the suction Of the two powerful
Jets Of steam or air catches the material,
and, drawing It into the end Of the fun.
nels, forces It In two compact streams Of
solid substance, through the five.eighth.
Inch orifces to meet each other midway In
the bowl.shaped receptacle. The velocity
Of each stream Of material Is 5000 feet per
second, speed equal to, or greater even.
then a Mauser bullet. This terrific i'm.
pact reduces the material to powder finer
than wheat flour.
A pneumatic elevator, vacuum stack,
removes this powder as fast as It Is pro-
duced, carrying 1t to bins, from which It
can be drawn off through gates or chuies.
The suction of the pneumatic elevator Is
so regulated that It will carry away only
powdered particles, coarser particles tall.
ing back to again be fed into the machine
by a simple device. After being reduced
to powder, ores are then treated as In 9th.
er reduction processes.
The pneumatic pulverizer works
equally we'll with superheated steam or
compressed air. Wherever water power
exists one or more Of these machines can
be operated successfully. The machine
does not weigh more than an upright
piano. Il can be taken apart, the heavi.
est piece weighing but AZ pounds; hence
It can be taken anywhere that a mule or
a man can carry small pack. The ad.
vantages Of the pneumatic pulverizer over
stamp mills and other machines may be
enumerated as follows:
They can be taken anywhere on the
shoulders Of men or pack mules.
They require no special foundation for,
there being not particle Of jar or strain,
they operate equally well resting on the
bare earth or on thin boards.
The first cost Is less than One.half the
cost Of stamp or other mills Of equal ca.
paeity.
The expense Of operating the new ma.
chine Is less than 80 per cent Of the cost
Of operating stamp mills.