IMPROVEMENTS IN SLAG-BOXES
Year: 1884

page_text: I, EDWARD PARKER JOHNSON of 13 Lennox Street Middlesbrough in the county
of York, Draughtsman do hereby declare the nature of my said invention for
"IMPROVEMENTS IN SLAG-BOXES," to be as follows:-
The object of this invention is to provide a box to be carried on any present
design of slag bogie or wagon for receiving and conveying away the slag from blast
or other furnaces in which the molten material will quickly cool, and from which
the solidified mass or "slag balls " may be discharged into river barges in small
pieces.
The slag box may be made of any suitable or required shape, but I prefer for
ordinary purposes to use one which is circular in cross section. The walls of this
box I make in a number of sections preferably four, connected and held together
by cotter bolts or the like. I then insert in the box, division plates, dividing it
internally into a number of separate spaces or compartments. These division
plates may be made of any shape, or in any number of pieces, with an air space
through them. Where two compartments are required, one division plate across
the box will be sufficient joined to the walls of the box at its ends with the
junction of the sections of the box. Where four compartments, which are the
number I consider best adapted for the purpose, are used, three or four division
plates may be employed to divide the interior of the box. These plates are cast or
otherwise formed with a projecting flange at the end, which comes in contact with
the walls of the box. This flange then fits between the edges of the segments of
which the box is formed, and is held tightly there by means of the bolts which
hold the box together. One of these plates may be placed across the box, and the
other two bolted to it in the centre, or the four may be formed each with flanges
on their inner ends and then bolted together. When a greater number than four
is required, a central support may be inserted to which all could be bolted. The
slag box is made tapering or conical to allow its easy removal from the slag to be
discharged, as also the division plates, making the compartments of the box smaller
or narrower at the top. A current of air circulating through the space in the
division plates cools them, and the mass of slag is more quickly cooled than when
in a solid mass in a slag box without divisions. The boxes will be placed on a
bogie or wagon and carried away from the furnace in the usual manner, and the
slag discharged from them into river barges in small pieces. To allow of a free
passage of air to the air spaces in the division plates, a number of holes are formed
in the bogie or wagon top. In this way the air passes from underneath the bogie
through the holes in its top to the air passages or spaces in the division plates,
which spaces are intended to keep the division plates cool, and at the same time
cool the slag as it is being run into the box.

page_text: By the use of my invention the slag may be tipped direct down shoots into
barges, and not onto the ground as at present, to be loaded up again after it has
cooled and been broken in pieces. As soon as my improved slag box is filled, it is
allowed to stand for about one hour for the slag to set sufficiently to allow of box
and divisions being drawn off, when so done the slag is left standing on bogie in
pieces as required, which will cool rapidly (a great advantage) and lose its tenacious
property, which when tipped on heavy cast iron shoot plates will again break into
smaller pieces, the cooler the slag being tipped the smaller pieces it will break into.
To facilitate discharging the boxes, the bolts which hold the segments together
may be loosened.
COMPLETE SPECIFICATION.
I, EDWARD PARKER JOHNSON of 18 Lennox Street, Middlesbrough in the
County of York, Draughtsman do hereby declare the nature of my said invention
for "IMPROVEMENTS IN SLAG BOXES "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 a box or mould to be carried on a slag
bogie or wagon preferably such as is at present in use for receiving and conveying
away the slag from blast or other furnaces in which the molten material will
quickly cool, and from which the solidified mass or "slag balls" may be discharged,
in small pieces into river barges or elsewhere.
It consists broadly of a box the walls of which are made in a number of sections,
and divided internally into a number of compartments by division plates or
partitions each of which is provided with an air space through which a current of
air passes to keep it cool.
The invention is best described by aid of the accompanying drawings with
reference to which it will be described in detail.
Figure 1 sectional elevation on line x-x.
Figure 2 sectional elevation on line y-y.
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page_text: walls of the box are made in a number of pieces or sections A connected or held
together by cotter bolts a or similar mechanical appliance which are easily fastened
or unfastened as may be required. Into the box so formed, partition or division
plates B B are inserted dividing it internally into a number of spaces or compart-
ments. The division plate B extends across the centre of the slag box from side
to side fitting in between the sections A and is secured firmly in position by means
of the bolts a which pass through the lugs b. Where but two divisions or
compartments in the box are required, the one division plate B will be sufficient,
but when the box is required to be divided into four compartments the number
which I consider best adapted for the purpose, two additional division plates B¹
are inserted, each secured at one end between the sections A of the box as shown,
and at the other end bolted to the division plate B. Instead of one of these plates
being placed across the box and the other two bolted to it in the centre, four
plates may be employed, formed each with flanges on their inner ends and then
bolted together. When a greater number than four is required, a central support
may be inserted to which all could be bolted, and the outer ends of the plates.
instead of being secured between the joints of the several sections, may be made
with flanges and bolted thereto, but I consider the method shown the best.
The sides of the box are made to converge slightly towards the top so that the
box and division plates may be easily lifted together and removed from the slag
when set. For the same purpose the division plates Band B¹ are tapered or wedge-
shaped, the narrow or thinnest end being at the bottom, thus making the compart-
ments in the box smaller at the top. Each of the partitions or division plates is
hollow provided with two walls or faces connected together by ribs C with a
space D between them through which a current of air passes. The partitions B B¹
may be each cast or otherwise formed in one piece, or may be in two pieces, the
opposite ribs C abutting against each other. I prefer however to make the
partitions in separate pieces as being less expensive to manufacture than in ono
piece. A current of air passing or circulating through the space in the division
plates cools them, and the slag is more quickly cooled than when in a solid mass,
in a slag box without being divided up by partitions. A further advantage arises
from the use of the cooling partitions, not only is the "slag ball" divided by means
of the partitions into separate pieces or so divided as to be easily reduced to pieces
corresponding to each compartment, but being coiled with greater rapidity it is
more brittle and easily broken so that the pieces from the slag box or mould
corresponding to the size of the compartment can be still further broken and
reduced without much labour. Each of the partition or division plates is cut
away or formed arch shape at that portion which comes over the centre of the
bottom of the box, as clearly shown at E in Figures 3 and 4, the object being to
connect all the compartments in the box, so that each may be filled on the liquid
slag being run into one of them without the necessity of turning the box until
each compartment is brought under the spout of the furnace. In forming this
archway under the division plates it is necessary to enclose that part of the air
space which covers it to prevent the slag filling this also. To allow of a free
passage of air to the air spaces in the division plates, a number of holes are formed
in the bogie or wagon top. In this way the air passes from underneath the bogie
through the holes in its top to the air passages or spaces in the division plates,
which spaces are intended to keep the division plates cool, and at the same time
cool the slag as it is being run into the box. The boxes will be placed on a bogie
or wagon, and carried away from the furnace in the usual manner, and the slag
discharged from them in small pieces down shoots into river barges or elsewhere.
Or instead of being tipped into shoots the "
slag balls may after the removal of
the box or mould be discharged from the bogies by means of a steam or hand
power jib crane having a pair of dogs at the end of the lifting chain by which each
slag ball is lifted separately from the bogie.
.
"
It is not necessary that the hollow partitions or division plates should in each
case extend down to the level of the bottom of the box as in some instances it may

page_text: bo found more convenient and perhaps less costly in the course of construction, to
place them to extend to about three thirds the depth of the box or mould. In
such case the partition may be made of V or U shape covered in or not on top,.
and preferably opened at the ends to allow the passage or circulation of a current
of air. The top part of the box would be divided into two or more compartments,
as horeinbefore described.
By the use of my invention the slag may be tipped direct down shoots into
barges, and not onto the ground as is at prosent the case requiring to be re-loaded
after it has cooled and been broken in pieces. As soon as my improved alag box is
filled it is allowed to stand for about one hour for the slag to sot sufficiently to
allow of box and divisions boing drawn off, when so done, the slag is left standing
on the bogie divided into pieces corresponding with the compartments in the slag
box, which will then cool rapidly (a great advantage) and lose its tenacious
property, which when tipped on heavy cast iron shoot plates will again break into
smaller pieces, the cooler the slag when being tipped the smaller will be piecos into
which it will break. To facilitate discharging the boxes, the cotter bolts which
hold the segments together may be loosened.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed I wish it to be
understood that the invention is not limited to the exact details shown, as the
construction and contour of the partitions or division plates may be altered if
required by making them angular or otherwise, I declare that what I claim is
1st. The manufacture and use of slag boxes constructed with the sides or walls
in sections bolted or fastened together and having one or more partitions or intornal
division plates forming a number of separate compartiments, substantially as and
for the purposes described. *
2nd. A slag box having one or more division plates partitions or hollow metallic
cores projecting into the slag space with air spaces or channels in their interior
through which a current of air passes or circulates, substantially as and for the
purposes described.
3rd. The use in a slag box of a hollow partition or of a division plate having
walls or faces oach fronting a compartment of the box, with an air space between
the said walls, substantially as described and shown.
Dated this 26th day of June 1885.
WP. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
and 323, High Holborn, London,
Patent Agents for the Applicant.