Improvements in Utilization of Tin Plate Scrap.
Year: 1891

page_text: Date of Application, 30th July, 1891
Complete Specification Left. 28th Apr., 1892-Accepted, 23rd July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Utilization of Tin Plate Scrap.
I FRANK WILLIAM HARBORD Metallurgist, of Penn Fields, Wolverhampton
& I WILLIAM HUTCHINSON Junior, Clerk of "The Ferns" Penn Fields
Wolverhampton do hereby declare the nature of this invention to be as follows:-
-
The object of our invention is to separate the tin from the iron with which it
is alloyed & to recover the greater part of the tin in the form of oxide &
convert the iron into merchantable iron or steel.
We first treat the tin scrap in a cupola or other suitable furnace by melting it
with pig iron, cast, or wrought iron scrap at very high temperature by which
means the greater portion of the tin is volatilized & we recover it in suitable
condensers & at same time we obtain the iron alloyed with small portions of tin
which will vary according to the conditions of previous melting. This alloy we
subject to a further treatment with other pig iron, scrap, &c. in a basic Bessemer
converter, basic Siemens, puddling or other suitable reverberatory furnace.
Lime additions & oxidizing agents such as oxide of iron being added in
usual way:
By this means the tin is sufficiently removed & passes away
into the slag & iron or steel is obtained equal to that obtained from ordinary
pig iron.
In some cases we dispense with preliminary melting in cupola & treat tin
scrap direct in basic Siemens furnace with pig iron & other scrap, iron ore &
lime when a portion of the tin is volatilized & recovered in condensers & a
portion passes into the slag in form of stannate of lime in same way as when
cupola alloy is treated.
Dated this 29th day of July 1891
FRANK WILLIAM HARBORD.
WILLIAM HUTCHINSON, JUNIOR.
COMPLETE SPECIFICATION.
Improvements in Utilization of Tin Plate Scrap.
I, FRANK WILLIAM HARBORD, Metallurgist, of Penn Fields, Wolverhampton
& I, WILLIAM HUTCHINSON Junior, Clerk of "The Ferns" Penn Fields,
Wolverhampton do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described & ascertained
in and by the following statement:-
The object of our invention is to separate the tin from the iron with which it is
alloyed and to recover the greater part of the tin in the form of oxide & convert
the iron into merchantable form or steel.
We first treat the tin scrap in a cupola or other suitable furnace by melting it
with pig iron, cast or wrought iron scrap at very high temperature by which means
a portion of the tin is volatilized which we recover in suitable coudensers at same
time we obtain the iron alloyed with some tin which will vary according to the
conditions of previous melting as described in Letters Patent No. 11,190 of the
year 1891.
The amount of scrap used varies with the composition of the pig or scrap iron
used with it and with the quality of iron required, thus if grey iron required only
30% of scrap is used, if white as much as 70% can be used especially in making
basic pig. This alloy we subject to a further treatment either alone or with other
pig iron, scrap &c. in a basic Bessemer converter, basic Siemens or other suitable

page_text: furnace. Lime additions and oxidising agents such as oxide of iron being added in
usual way. By this means the tin is sufficiently removed & passes away into the
slag the iron or steel obtained being equal to that obtained in the ordinary way of
working.
In some cases we dispense with preliminary melting in cupola and treat tin or
galvanized scrap, varying from 30% to 70% of charge direct in basic Siemens
furnace with pig iron and other serap iron, ore, and lime, when a portion of the tin
is volatilized and recovered in condensers and a portion passes into the slag in
form of stannate of lime in same way as when cupola alloy is treated.
We find that about 2 cwt. of iron ore and one to one and a half cwt. of lime is
required to each ton of steel produced and we use about from 30% to 70% of scrap
as in ordinary work with Siemens furnace. When galvanized scrap is used the
whole of the zinc is volatilized.
Having now particularly described and ascertained the nature of our said inven-
tion & in what manner the same is to be performed we declare that what we
claim is.
1. The improvement in the utilization of tin plate or galvanized scrap which
consists in melting the said scrap with a suitable proportion of cast or pig iron &
utilizing the product so produced in the manufacture of iron & steel substantially
as described.
2. The improvement in the utilization of tin plate scrap which consists in melting
same with a suitable quantity of cast or pig iron in a suitable furnace, condensing
the tin oxide volatilized & removing the tin in the resulting iron by a subsequent
treatment in a basic lined furnace or vessel substantially as described.
3. The treatment of tin or galvanized scrap in basic open hearth furnace & basic
Bessemer converters substantially as described.
Dated this 26th day of April 1892.
FRANK WILLIAM HARBORD.
WILLIAM HUTCHINSON, JUNIOR.