Improvements in the Treatment of Blast Furnace Slag and other Slags, and in the Apparatus therefor.
Year: 1889

page_text: Date of Application, 5th July, 1889
Complete Specification Left, 5th Apr., 1890-Accepted, 10th May, 1890
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of Blast Furnace Slag and other
Slags, and in the Apparatus therefor.
I, THOMAS HYDES of Havelock Square, Sheffield in the County of York, Engineer,
do bereby declare the nature of my invention to be as follows:-
This invention relates to the treatment of Blast Furnace Slag whilst in a molten
state direct from the furnace, for the purpose of reducing it to a granular or other
like disintegrated condition, for commercial purposes.
For this purpose I propose to conduct the molten slag as it leaves the furnace into
a funnel shaped receiver, over which and in a central position I fix the nozzle of a
jet of steam or compressed air.
Under the funnel shaped receiver, at some little distance from it, I fix a conical, or
other suitably shaped block, or spreader; the said spreader may vary in size and
form, as may be found necessary from time to time.
The operating blast is brought by a pipe to the underside of the spreading block
and escapes vertically through an annular orifice surrounding the spreader at or near
its top edge.
The above described mechanical parts of the apparatus are placed at or within the
lower entrance of a vertical refrigerating tube of considerable height, and which is
surmounted by an inverted conically shaped cover, supported in such a manner that
although the cone enters the tube, sufficient space is left between the cover and the
top edge of the tube for the purpose required. The cover is of larger diameter than
the tube, and its edge is curved downwards, for the purpose of deflecting the
disintegrated slag into cooling chambers, or passages, hereafter mentioned.
When the molten slag runs into the receiver, it is blown through by the jet before
mentioned, and falls upon the conical spreader causing it to fly off radially in a thin
sheet-like form, or in fine streams. At the edge of the spreader it meets the vertical
blast, by which it is disintegrated, carried up the refrigerating tube, and turned by
the curved surface of the cover into a series of descending chambers, pipes, or
passages, surrounded by cold water, down which it passes in a comparatively cool
state to the outlet, for removal.
In some cases instead of using a fixed or stationary spreading block, I introduce
a revolving table or disc, upon which the molten slag would fall from the receiver,
and from which it would be thrown by its rotary action meeting the blast as before
described.
As a modification, I dispense with the central jet, and the funnel shaped receiver,
and in place thereof, I allow the molten slag to drop from a conductor through a short
vertical tube upon a conical spreader.
The bottom edge of the said tube is turned over outwardly, its diameter not
exceeding that of the conical spreader, so as not to interfere with the course of the
blast.
The short tube is supported by a second blast pipe which forms a chamber round
it, and its exit is into the turned over lip before described, and which by its con-
figuration produces a second annular blast of smaller diameter inside the other, or
larger one thereby inducing a powerful current or auction through the tube and
drawing the molten metal into position to be acted upon by the blast.
Deted the 4th day of Inle 1889

page_text: COMPLETE SPECIFICATION.
Improvements in the Treatment of Blast Furnace Slag and other
Slags, and in the Apparatus therefor.
I, THOMAS HYDES, of Havelock Square Sheffield in the County of York, Eugineer
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:
This invention relates to the treatment of Blast Furnace Slag and other slags whilst
in a molten state, running direct from the furnace, for the purpose of reducing
it to a granular or other like disintegrated condition, suitable for commercial
purposes.
In order to illustrate my invention, I annex a sheet of drawings, showing the
method in which the treatment of the slag is or may be effected; like letters of
reference indicate like parts.
Fig. 1, is an elevation in section, of an apparatus capable of carrying out the
treatment above mentioned.
:
Fig. 2, is another arrangement of apparatus.
Fig. 3, sectional elevation of blast nozzle in Fig. 1.
Fig. 4, plan of same.
In carrying out my invention with the apparatus shown in Fig. 1, I run the
molten slag from the furnace into a conductor A, having an opening (or tube) B,
placed exactly over the centre of a spreader C, which may have a flat face as shown,
or may be conical as indicated by the dotted lines, or of other configuration that may
be found to be best adapted for spreading the molten slag on all sides.
The spreader C is supported centrally inside the mouth of a blast pipe D leaving
an annular oriface D' for the escape of the blast, which is preferably air under pressure.
Outside this annular oriface is a second annular opening of smaller area marked E¹,
and which is connected with the steam pipe E.
The blast nozzle is supported at the top, or thereabouts, of an air inlet tube F,
open at the bottom to the atmosphere, the whole being enclosed or surrounded by a
refrigerating. tube or jacket G, with a cold water space H, and descending passages
or pipes I passing through the water space, to the outlet J.
Thus when the molten siag falls upon the face of the spreader C, and runs over
the edge of same, it is spread into a thin sheetlike form, where it meets with the
vertical blast of air alone, or of air and steam combined, by which it is disintegrated
and carried upwards, falling backwards into the mouth of the descending passages or
pipes I, down which it passes in a comparatively cool state, to the outlet J, for
removal by any ordinary means.
Fig. 2, is a modification of apparatus to produce the same result; K is a blast
receiver or nozzle; supplied with air under pressure from pipe L, or steam from
pipe M, or a combination of both.
It is provided with a mouth N, of the full breadth or thereabouts of the shoot S,
which conveys the molten slag from the furnace to the apparatus.
As the molten slag leaves the end of the shoot it is blown forward and upward by
the blast issuing from the mouth of the nozzle, and carried forward in a disintegrated
state on to an inclined face of a refrigerator R, and passes by gravitation through
similar passages or tubes surrounded with cold water as described with reference to
Fig. 1.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In the treatment of molten slag for various purposes, blowing the whole of the
1
1
of bleat of nom

page_text: pressed air, or steam and air combined; iuto a disintegrated form, and in such a
manner that it will drop into, and by its gravity pass through cooling passages
or tubes surrounded with water, substantially as described and as shown in
Figs. 1 & 2.
2. In apparatus for treating molten slag, the construction of a blast nozzle with
one or more annular openings or mouths, having a central spreading block,
substantially as herein before described and shown in Fig. 3 & 4.
T T
• 100
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.