Improvements in the Treatment of Blast Furnace Slag and other Slags, and in the Apparatus used therein.
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 used therein.
I, THOMAS HYDES, of Havelock Square, Sheffield in the County of York, Engineer,
do hereby declare the nature of my invention to be as follows:-
This invention relates to the mechanical treatment of slag direct from the blast
furnace. I propose to pass the molten slag between a set of specially constructed
rolls, each roll being provided with an inlet and outlet pipe for a constant supply of
cold water to keep them cool.
Conveniently placed on a lower level, another set of rolls of similar construction is
fixed and between the two sets of rolls I arrange an inclined plane, as the means of
transit between the two sets; this incline or shoot I prefer to make hollow with an
inlet and an outlet for cold water.
When the molten slag leaves the first set of rolls it is in a sheet like form, and
during its passage to the second set of rolls it becomes cool and brittle, so that on
passing through them it is reduced to powder or thereabouts, and is in an advanced
stage for further treatment as cement or other like purposes.
Instead of the beforementioned rolls having a smooth surface, I may have them
ribbed, or indented in various forms, so as to produce cubes or other forms of slag
suitable for road metal, structural purposes and the like.
If the molten slag as it leaves the blast furnace is too liquid to be passed through
the rolls before mentioned, I may pass it into an intermediate vessel or appliance
until it is of a suitable consistance for the rolls.
Dated the 4th day of July 1889.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Treatment of Blast Furnace Slag and other
Slags, and in the Apparatus used therein.
I, THOMAS HYDES of Havelock Square, Sheffield in the County of York, 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:
This invention relates to the mechanical treatment of slag in its molten state when
run from blast furnaces and the like, for various purposes of manufacture, or for
other purposes.
I have illustrated my invention in diagrams Nos. 1 and 2, on the accompanying
sheet of drawings.
Fig. 1, represents two pairs of slag_rolls, (the supports being omitted), with a
hollow intermediate guide plate.
Fig. 2, represents two similar pairs of rolls, placed so as to dispense with the guide
plate.
In carrying this invention into practice, I pass the slag in its molten state, directly
from a suitable shoot or conductor A, of any desired width of mouth, into a pair of
rolls B, made hollow and provided with an inlet and an outlet O, connected with
water pipes to allow of a constant or an intermittent supply of cold water being passed
through them.

page_text: I place on a lower level, a second pair of similarly constructed rolls C, all the said
pairs of rolls being suitably supported in bearings, and driven by gearing of any
suitable description.
In diagram No. 1, the second pair of rolls are not placed directly underneath the
first rolls, for convenience of examining the progress of the operation, and I therefore
arrange an inclined plane, or intermediate guide plate D, to receive the slag as it
leaves the rolls B, and conduct it to the second or lower pair of rolls C, from which
it falls into trucks, or any other vessel, or receiver, endless belt or traveller or the
like.
In the diagram Fig. 2, the lower rolls C' are placed directly under the upper
rolls B so that the slag as it leaves the upper pair will drop between the lower rolls,
thus dispensing with the inclined guide plate, which may be done in some cases if
found desirable.
The guide-plate I prefer to make hollow, and to provide it with an inlet and an
outlet for the passage of cold water, air, or steam as may be found desirable.
When the molten slag leaves the first pair of rolls, it assumes a sheet-like form,
and during its passage down the incline to the second rolls it cools and becomes
brittle, so that in passing through the second rolls it is pulverised and reduced to
powder or to a granular form, and is in an advanced stage for further treatment in the
manufacture of cement, or other material.
Instead of the rolls having a smooth cylindrical surface, I may have them ribbed.
recessed, or indented in any suitable manner, so as to produce cakes, slabs, nuts, or
other like forms of slag to be useful as road metal, or for structural purposes; these
ribs, hollows and the like may be made in any or all of the rolls, and I wish it to be
understood that although I believe the best results are to be obtained with two
pairs of rolls as described I do not bind myself to use two pairs of such rolls in all
cases.
If the slag when it leaves the furnace is in a too liquid condition, instead of running
it direct into the rolls, I pass it through some intermediate vessel or receiver, and
from that to the rolls.
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 slag for various purposes, passing the molten slag through
rolls, said rolls being made hollow to contain water, for the purpose of chilling and
disintegrating, pulverising, or granulating the slag substantially as hereinbefore
described and shown.
2 In the treatment and preparation of slag for various purposes, causing the
molten slag to pass through rolls, one or both of the rolls being ribbed, fluted,
recessed or indented, so as to form the slag as it passes through, into blocks, cakes,
nodules, or other like forms substantially as hereinbefore described.
Dated the 4th day of April 1890.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.