The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1895-08-03

care of the heavy shipments of ore be-
ing recel ID, the Hanauer smelter is to
DE at once equipped with new roasters
and one or more new stacks come
within the range of early probability.
Mr.. Hanauer returned to the city yes
terday morning after an absence of
three weeks. during which time he
has visited San Francisco, Denver and
Omaha. While in the former city the
gentleman visited the works of the
Selby Smelling & Lead company,
where he inspected the new ROpp
straight line roasting furnace. So
well pleased was he with its working
that a duplicate was ordered for the
11anauer and the shipment Of the ma
chine is 10 be made at a very early
date Plans and specifications are now
being prepared for the erection of the
furnace and the necessary buildings
and the construction is to be not long
delayed.
The furnace is the invention of Al
fred Ropp, superintendent of the Selby
works, and is being manufactured by
firm of San Francisco engineers.
1t consists of an ordinary reVerbera-
tory hearth, rectangular in form, in
the center of which is a longitudinal
Slot or channel. Through this slot an
arm, connected below with a four
wheeled truck extends upwards, and
across the upper end of this arm is
the supporting bar from which the
rabbles, or stirring teeth, project The
carriage runs upon d track below the
slot or channel in a chamber provided
for il, where it is accessible at all
times, and while the furnace is in Op-
Grafton. This chamber continues the
entire length OF the furnace and is
made sufficiently large to admit of Il
man going under the carriage and
making necessary repairs. Four of
these carriages are placed at equal
distances from each other and are at
tao he'd to the steel wire rope by which
they are propelled: and the rabble
arms are so constructed that each side
can be adjusted independently of the
other by means of screws and slots,
and can be set so that the rabbles
shall reach the ore on tie hearth to
The proper depth. The track, after
passing underneath the furnace
throughout its entire length, is con-
tinued parallel with the exterior of the
furnace, describing curve at each
end. The driving mechanism of the
furnace consists of two beVel gears
with their shafts, and horizontal
sheave on the vertical shaft, around
which a steel wire rope travels. A sim
liar sheave is mounted on a vertical
shaft at the opposite end of the fur
mace. All of this mechanism is out
side the furnace and easily accessible
for oiling and repairing. The rope does
not get hotter than the hand can bear,
and it is not necessary that it should
be taut. The ore IS automatically fed
into the furnace at the feed end
through Challenge feeders. and IS
moved along the hearth, al any speed
desired, by the rabies, which are car
ried by the moving carriages or trucks
and is automatically discharged by
gravity into a hopper or car at the
discharge end.
During the time required for the
carriages to pass over the length of
the track exterior to the furnace, from
the point of exit to the point of en-
trance, the rabbles become cooled and
in condition to again enter the fur
mace Three or more fireplaces are
used. depending upon the fuel and the
work done. These freplaces are shown
IN the accompanying illustration of the
horizontal section, and can be ar
ranged for either hand or automatic
firing BY adjusting the automatic
feeder the capacity of the furnace can
be increased or diminished, and an ore
can be roasted dead or il can be dis
charged from the furnace, retaining
: NJ portion of the original percentage
OF SUlDnUI. IN CLlDIlQlZlllS, Lu- salt
can be fed at any point, thereby saw
ing the loss of salt and silver common
to those forms of furnaces in which
salt is fed with raw ore. The furnace
may also be used as a cooling or dry
ing hearth.
The standard furnace is 105 feet long
and II feet wide in the clear, and has
proven capacity to roast thirty-siX
tons of ore, containing 20 per cent sui
phur. per cent. lead and 1712 per cent
zinc and iron pyrites down to per
cent sulphur, in twenty-fOur hours To
roast dead the furnace requires slow
feeding. and will handle from twenty
to twenty-five tons in twenty-four
hours. reducing the sulphur contents
TO less than one-half of ! per cent.
The total weight of the iron work of
the furnace is about $4,000 pounds, and
the price of this iron work is $500 de-
1ivered f. 0. b. San Francisco, which
{ncIdes the erection drawings and the
services of a superintendent of con-
struction, whose fares and expenses, !
however are to be paid by the pur-
chaser. In the construction of the
furnace about 1900 red and $4,000 fire
bricks are required. The cost of erect |
4o oA!snIox9 'hqI9S 4B 9oBuInJ 9Ul SUI
the cost of the iron work, was about
81 FOG. the price paid for red brick be-
ing 80 and friedrich S25 per thousand.