Improvements relating to the Treatment of Slag and to the Removal thereof from Furnaces.
Year: 1890

page_text: Date of Application (in United Kingdom), 27th Sept., 1890
Complete Specification Left, 27th Sept., 1890-Accepted, 14th Mar., 1891
COMPLETE SPECIFICATION.
Improvements relating to the Treatment of Slag and to the
Removal thereof from Furnaces.
I, ORRIN BURTON Peck, of 162, 34th Street, Chicago, Illinois, United States
of America, Mining Engineer, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The object of my invention is to provide for granulating the slag of smelting-
furnaces and withdrawing the same or carrying it away after it is granulated;
and the said invention consists in the method hereinafter described.
The accompanying drawing shows a side elevation, partly in section, of an
apparatus adapted to carry out my process of granulating and pumping away smelting
furnace slag.
V represents a vessel by means of which the molten slag is granulated; A, a
shaft by which the vessel is supported and rotated; B journal boxes or bearings ;
C a centrifugal or force pump; D, a pipe or conduit for introducing water; E, a curb
forming a chamber around the slag-vessel; F, a passage between the chamber and
pump, and H a spout or conduit for carrying away the slag and water from the
pump.
Various forms of mechanism may be used for carrying out my process, one of
which I have shown in the drawing. This apparatus consists, essentially, of a
centrifugal machine having a revolving vessel or receptacle adapted to receive the
molten slag or product to be granulated and to discharge the same in small or
divided particles; a pipe or conduit for introducing water and spraying it on the
molten slag as the slag is discharged in particles from the receiving vessel or
receptacle; a surrounding curb forming a chamber for arresting the water and
granulated slag; a centrifugal or other force-pump for pumping away the granu-
lated slag and water, and suitable pipes or passages for connecting the pump with
the machine and for carrying away the granulated slag and water.
In operation the molten slag is introduced into the receiving vessel in any con-
venient way, but preferably from the top. The rapid revolving of this receptacle,
causes the slag to be thrown off or out of it, preferably from the top, in a granulated
state, or rather in finely-divided particles which in cooling are solidified in a granu-
lated state. Most of the separated particles, thrown off or out from the receptacle
are of a spherical form, so that when cooled most of the slag is in little round
particles, something like shot. This enables them to be pumped out with the least
possible wear or injury to the machinery.
I prefer to divide or separate the molten slag into particles by a centrifugal
machine, or by subjecting the slag to the action of centrifugal force; but it be
separated in other ways.
may
I prefer to introduce the water used for cooling the slag in a spray; but it may
be introduced in any other convenient way. In some cases, also, it may be found
advisable to introduce steam in place of or in addition to water, for the purpose of
i

page_text: cooling or hardening the divided slag. My object in thus using water is to quicken
the solidifying of the particles of molten slag to keep them from again uniting
or sticking together in mass and to enable them to be readily carried or pumped
away.
I prefer to employ a centrifugal pump for forcing or conducting away the water
and granulated slag; but any other suitable pump capable of doing the work may
be used for this purpose. The pipe or spout for carrying away the slag and water
from the pump may be made in any form and extended to any distance desired ; but
it will generally be found advisable to extend it to the point of final deposit for the
slag.
As the essential feature of my invention consists in granulating and watering the
slag and then pumping it away while in a granulated state, it will of course be
understood that I intend this application to be generic, and that I do not limit
myself to the special forms or steps above described.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
:-
First. The method of carrying away or removing smelting-furnace slag, which
consists in finely dividing it while in a molten state, mixing it with water, and
pumping it out to a place of deposit, substantially as described.
Second. The method of carrying away smelting-furnace slag, which consists in
finely dividing the molten slag, mixing it with water while finely divided and pumping
the particles and water away, substantially as described.
Third. The method of carrying away smelting-furnace slag, which consists in
finely dividing it while in a molten state by the action of centrifugal force, subjecting
the divided particles to the action of a cooling medium, and then pumping them out
to a place of deposit, substantially as described.
Dated this 24th day of Santambar 1800
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agers for the Applicant.