A New Method of Dealing with Blast-furnace and other Slag, and Apparatus therefor.
Year: 1892

page_text: Date of Application, 19th Aug., 1892
Complete Specification Left, 18th May, 1893-Accepted, 24th June, 1893
PROVISIONAL SPECIFICATION.
A New Method of Dealing with Blast-furnace and other Slag, and
Apparatus therefor.
I, THOMAS DENNIS ROCK, of 62 Leadenhall Street in the City of London,
Mercantile Engineer, do hereby declare the nature of this invention to be as
follows:-
The object of the invention is to provide means for dealing with the slag from
blast furnaces and other sources in a more economical and convenient manner than
heretofore.
I break up the slag by passing it between a suitable pair of crushing rolls
immediately after or during the process of subjecting it to the disruptive effect of
streams or sprays of water directed on to it in any suitable manner.
I may direct
sprays of water on to the slag both during the crushing and previous thereto, and
I prefer that the slag should pass through the rolls and fall into a tank or vessel
containing water.
My apparatus consists of a strong roll of suitable dimensions, driven in any
suitable manner: also a second roll, preferably of larger diameter than the first
and having its bearings free to slide upon inclined guides in such a way that the
weight of the second roller keeps it constantly pressing against the first roll, or
against the material between the two rolls. The second roll is driven by friction
with the first roll, or with the material between them. It will be desirable to
provide adjustable stops for the purpose of limiting the approach of the second
roll to the first roll, and thereby regulating in some measure the size of the pieces
into which the slag will be broken. The bearings of the free roll being upon
guides which are inclined downwards towards the first roll, it will, by virtue of its
weight, exert a constant pressure against the first roll, while it will readily yield
to any excessive pressure arising from the passage of iron, steel, or hard slag. The
pressure between the rolls may be varied by varying the angle of inclination of the
bearing guides of the free roll.
I provide a vessel or tank of water in such position, and with the water
maintained at such level, that the broken slag will fall into it and the rolls revolve
with their lower parts immersed in it. I constantly change the water in this
tank by means of pumps or otherwise. I may form such cavities within the rolls
as appear desirable, in order that the water from the tank may flow into and out of
them and prevent any undue heating of the rolls.
The slags runs from a spout or shoot on to one of the rolls, preferably the
smaller and fixed one, while by means of suitable pipes, streams or sprays of water
are directed on to the stream of slag on its way to the roll. The spout or shoot
is preferably made hollow in order that water may circulate through it and prevent
its destruction by the hot slag.
I assist the disruptive action of the water spray by delivering the stream of
slag on to the roll at a line as far removed as is practicable from its line of contact
with the other roll, so that it may remain as long as possible in contact with the
surface of the roll before it is crushed.
After passing through the rolls the broken up slag falls into the water tank and
is thereby thoroughly and finally cooled. I provide an elevator or dredger, driven
and operated as desired, for raising the slag from the bottom of the tank and
depositing it upon a conveyor, or into storage hoppers or trucks. The tank may
advantageously be provided with a diaphragin and shutter so situated and arranged,
that the part of the tank in which the dredger works may be separated at will
from the other part, and emptied, and repairs to the dredger or elevator thereby

page_text: rendered possible without emptying the whole tank or raising the elevator out
of it.
D
1
1000
T. DENNIS ROCK.
COMPLETE SPECIFICATION.
A New Method of Dealing with Blast-furnace and other Slag, and
Apparatus therefor.
I, THOMAS DENNIS ROCK, of 62 Leadenhall Street, in the City of London,
Mercantile Engineer do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The object of this invention is to provide means for dealing with the slag from
blast-furnaces and other sources, in a more convenient and economical manner than
heretofore.
I break up the slag by passing it between a suitable pair of crushing rolls
immediately after or during the process of subjecting it to the cooling and
disruptive effect of streams or sprays of water directed on to it in any suitable
manner. may direct streams or sprays of water on to the slag both during the
crushing and previous thereto, and I prefer that the slag should pass through the
rolls and fall into a tank or vessel containing water, from which tank or vessel it is
conveniently raised by a power driven mechanical elevator.
An important part of my invention consists in subjecting the slag to a mechanical
breaking up process immediately after or even during the time that it is being
subjected to the thermal disintegrating action due to cooling by water; and I
therefore do not confine myself particularly to any form of rolls. I have, in fact,
found that a revolving shaft carrying strong arms which strike the slag and break
it up as it comes into contact with the water, acts very well in some cases.
supply of water is delivered on to the slag by pumps, gravitation, or other means,
as said slag falls on to the rolls or other mechanical breaking up devices, and the
excess of such water falls into the tank with the broken slag.
A
In describing the manner in which I carry my invention into practice, I make
reference to the accompanying drawings, in which
Fig. 1 is a sectional elevation of one arrangement of rolls, water supply, cooling
tank, and elevator.
Fig. 2 is a plan of the same.
Fig. 3 is a general elevation of plant for treating slag, showing the manner in
which said slag is economically and conveniently treated by the aid of my
invention.
Fig. 4 is a sectional elevation of part of one form of my apparatus, showing the
manner in which 1 employ a revolving shaft with arms, which may be termed a
paddle, to break up the slag at the moment of its contact with the water.
a is a spout or shoot from which the molten slag runs on to the roll b, (Figs. 1
and 2), or paddle c, (Fig. 4). b and d are rolls, which are hollow and revolve in
close proximity to each other as shown: they are geared together by the toothed
wheels e and f, and are driven by a suitable engine through the driving chain h.
By means of a water pipe with jets i, water is delivered in streams to meet the
slag as it falls on to the roll b or paddle c, thereby partially cooling the slag and
rendering its mechanical treatment by the rolls or paddle a comparatively light
work. The slag afterwards passes into the tank j, together with any excess of water
from the nozzles i, and thereby becomes finally cooled. It will be seen that the
tank is of such form that the broken slag will gravitate towards the mechanical
elevator k, which sweeps the lowest part of the tank. By this elevator the slag
is raised out of the tank and deposited on a conveyor or otherwise. For the
purpose of keeping the water in the tank at a suitably low temperature, I provide

page_text: a water inlet and a water outlet m, so that by pumps, gravitation, or other means,
I can constantly circulate water through the tank. n is a grid or grating for the
purpose of preventing any undue overcrowding of, or injury to, the elevator k.
The tank is conveniently made to serve as a supporting frame for the bearings
of the spindles of the rolls, paddles, or elevator drums. I prefer that the distance
between the rolls should be adjustable in some measure, in order to control the
degree of crushing to which the slag is subjected. The amount of this adjustment
will in many cases be so small that no change will be required in the toothed
wheels e and f; but, if a greater amount of adjustment be found necessary, I can
employ toothed wheels of slightly different diameters. The roll d may be driven
in some cases by friction with the roll b, or by friction with the material between
the two rolls, said roll d being kept against the roll b, or against said material, by
virtue of the fact that its end bearings are, in such a case, left free to slide on
guides p, inclined downwards towards the roll b. When the rolls are geared
together as shown in Fig. 2, the roll d will have its bearings firmly fixed to the
frame or tank.
I prefer that the rolls should be partially immersed in water, and that the water
should be allowed to flow freely into and out of their hollow interiors through
holes formed in their ends. By this means the rolls are kept cool and their
efficiency is increased.
The paddle shown in Fig. 4, besides assisting in the breaking up of the slag,
Sweeps the broken slag towards the elevator. I may use a paddle in addition to the
rolls, in order to feed the broken slag towards the elevator.
Whenever it is desired to effect repairs to the foot of the elevator, or to gain
access to the tank for any other purpose, I close the water inlet and remove the
water from the tank by the outlet m.
Fig. 3 illustrates the general utility of my invention. j is the tank, carrying the
rolls or other mechanical breaking device s, and dredged by the elevator k.
The elevator raises the slag and deposits it upon a conveyor t, by which it is
conveyed to a storage hopper w, or otherwise deposited. From the storage
hopper it is conveniently passed into ordinary trucks by gravitation, for conveyance
to any place required.
Having now particularly described and ascertained the nature of this my inven-
tion, and the manner in which the same is to be performed, I declare that what I
claim is:-
1. Apparatus for dealing with slag from blast furnaces or other sources, in
which the slag is subjected to a mechanical breaking or crushing by rolls or
otherwise, immediately after or during the thermal disintegrating action due to the
slag coming into contact with water whilst in a heated condition.
2. In apparatus for dealing with slag from blast-furnaces or other sources, the
use of rolls, paddles, or other mechanical breaking devices, working over a tank or
receptacle of water, and having a supply of water so arranged in regard to them
that the said supply of water assists by its cooling and disruptive effect, the
mechanical action of the rolls or other breaking devices.
3. In apparatus for dealing with slag from blast furnaces or other sources, the
combination of the mechanical breaking or crushing device, the water supply,
the cooling tank, and the elevator, substantially as described in reference to
Figures 1, 2, and 4.
101 1
1000
T. DENNIS ROCK.