The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1909-05-16
NEW MILL METHODS
TO Be INSTALLED
United States Company Again
Determines TO Have Modern
Appliances.
INTERESTING CHANGE
PLANNED FOR MILL
Cleaner Separation and Better
Saving of Values Certain
to Accrue.

This is certainly an age of develop
meDt in the mining and mctallOrGical
field. Hard times of tho past year or
two have apparently been productive of
new devices for tho Turing of the metals
from the ores or ganguc in which they
are imbeddcd. The United States
Smelling company has at its plant near
Bingham junction concentration where
its Bingham lead suplhidcs are concen-
rrated INTO two products-lcnd concen-
trates and zinc concentrates. The sep
aration of lead from zinc as at present
accomplished at the conccntrator is not
entirely satisfactory.
The United States people have, there
fore, been experimenting for some
months TO find process that would
make n cleaner separation and 4 saving
of the values in tho tailings, They
have now satisfied themselves apparent
ly, for orders have been given for the
erection, with ali possible haste of n
tube mill for fine grinding and "A plant
for elcctrostatjc separation. TO cost ap.
proXlmateIy $4,000.
1t is expected that the savings there
by will be very large, enabling the com
panv TO market lis zinc at $40 per ton
Of 80 per cent zinc concentrates. where
rs the zinc heretofore, without com
plete separation has been too low to
make It's marketing commercially pos.
siblc.
The fine grinding mill has bcou
planned with all the known devices for
economical handling. The material is
raised by Premier pumps 10 shovel
wheel. where the excess water is re-
moved. From there il drops into bins
and is fed automatically TO a pair of
30xl2 rolls. After rolling the material,
ii passes into Il tube mill lined with
Slick brick and filled with flint peb.
bles, where it is ground TO desired fine
ness. Pumps again elevate it to screens
ut the top of the mill The oversize
returns to the tube mill and the under
size TO pulsatng classi6er. The six
products here made are concentrated on
tables into the lead and zinc coucen.
trates. The lead concentrates 90 to the
smclter, but the zinc concentrates arc
too low in zinc TO market and contain
iron which is valuable in the smelling
operations.
So the process now developed takes
up these lowgradc zine concentrates
and by the installation of machines spc
cially adapted it avails itself of the
fundamental laws of static electricity,
by which bodies charged with similar
kinds OF electricity tend to repcl one
another. and whilc charged with dis.
similar kinds they tcnd TO attract one
another. BY means of this principle a
machine has been constructed by which
an insulated metallic roll is charged 10
n high potential, aud upon this roll is
dropped a mixture of pyrite and zinc
bIcude. The pyritc being a good con
ductor. is Immediately charged and Wig
orously thrown away from the roll,
whilst ilp zinc i not similarly rcppllcI
and drops from Inc roll into bins pro
vided for it. This is IN substance the
process; but thc technical details arc
complicated. Its success is not oucs-
toned by the STAFF Of the smelling com
pany.
Following these new methods so close
ly upon its scheme for handling all the
gases of IFS lead smcltcr aud removing
ihcTefrom by process Of playhouse all
tho dust or fumc. arsenic and sulphuric
acid, so that nothing leaves the stack
of an injurious nature. 1T II TO be seen
that the United States company has
lost no time in adjusting It's operations
TO the conditions required of IL by the
decree of court and 10 install the verv
newest devices for the saving of values
in ITS ores to rccompcpSc 1t for the cx-
fra cost of these operations. The
United States company, III its opera.
lions in this valley. is very far in the
lead of all other smclters in tho con.
troll Of IFS fumes, aud cncoura cement is
its due for the energy and money IT
has expended in solving the problems by
which il can continue TO smelt ores IN
Salt Lake valley without damage. II
employs a large number of local men
distributing monthly payroll, and
consuming a very considerable amour
Of local supplies