Idaho County free press. [volume] (Grangeville, Idaho Territory) 1886-current, 1890-07-04

excess of magnetic oxide is necessary to
offset the reducing action of the blast
furnace gases during the smelling. The
presence of magnetic oxide in the Stag
may be taken as proof of the complete
suiphuration of silver, etc, and the
presence OF metallic iron in the matte, a
proof of loss.
Where sulphur is to be got rid of, the
snper-sulp hurous ores should be charged
first and roasted in the usual manner
for oxidation, when they may be treated
like, or with, the oxidized ores. Enough
of sulphur should, of course, remain to
effect the reduction of the iron oxides
for the formation of Stag without the
use of coal), and Also to keep enough of
iron su'phurised for production of the
proper proportion OF matte.
Finally, the temperature of the charge
should be increased, as before stated. to
produce agglomeration; and the whole
may then be Withdrawn from the fur
mace and delivered to the brickiny rolls.
From these it may be elevated" into
an elevated, covered. brick bin, where
it should be mixed with portion of
pyritous ore, which should be reserved
for this purpose, and which will be
needed for obvious causes.
From the bottom of this soaking
bin," the roast-suT may be Withdrawn
for smelling; and, by this arrangement
much heat can be saved. as the stuff
will remain hot The ore, when pre-
pared in this way, should smelt very
rapidly, and with but small fuel re-
quirment. A low furnace will give the
best results. In any case, the Jumps of
prepared ore should be as large as is
consistent with complete fusion before
reaching the tuere region.
The stuff, when charged hot, NAV give
trouble by softenng and "gobbing" be-
fore fnsion. This d. hiculty NAV be OBJ
waited believe by mixing the fuel and
the ore charges together. ] think there
would be but little danger from reduc-
ton OF iron; as the Incipient fusion in
the rooster will have coated the particles
with Stag, which will serve as protec-
ton against reducing gases, and also
against oxidizing influences rs well.
The adaptation of roasting furnace
and plant to the practical requiiments
of this process Is matter yet to be
worked out. "Bruckner's Cylinder"
would need better firing arrangements
and some means for dischargng the
plastic contents and delivering the same
to the bricking machine; also means of
aflording easy access TO The interior of
furnace for removal of "gobs" which
will stick 20 the walls, etc. etc. The
"Siemens' Rotary,"t as designed for the
direct iron making process" is far
mace which may be found apple ,ble, by
some notifications, to this process.
Brucknel's Cylinder was, as limited in
the beginning Of this paper, the first
thought that came into my mind.
The bricking rolls, for the hot stuff.
may be simply futed with semi-cvlin.
drical depressions, and gearcd together
so AS to produce compres.ed cylinders
Of tie stuff. This arrangement would
give the surest feed, and free delivery.
The stuff need not be very far adj
vanced in the FITTING process in order
to cohere by compression.
This series will be concluded by one
more paper, which will be DEVOTED to
'reverberatory smelling" Several at
tacks of illness, from IL malay of which
it is the writer's misfortune 10 be vic
TIM, have been the cause of the long
delay in the preparation of these papers.
The readers Of the L. L. will please
accept his apology.
[fFor description of this furnace
and its workings, see Howe's Metal
urgy of Steel."]