IMPROVEMENTS IN A communication SEPARATING TIN FROM TIN PLATE SCRAP OR TINNED ARTICLES
Year: 1882

page_text: LETTERS PATENT to Walter Alfred Barlow of 6 St. Paul's Churchyard
London Patent Agent and Engineer for an invention of IMPROVEMENTS IN
A communication
SEPARATING TIN FROM TIN PLATE SCRAP OR TINNED ARTICLES
from abroad by Louis Bourau of Paris, France
PROVISIONAL SPECIFICATION left by the said Walter Alfred Barlow at
the Office of the Commissioners of Patents on the 31st March 1882.
"
WALTER ALFRED BARLOW of: 6 St. Pauls Churchyard London Patent Agent and
Engineer IMPROVEMENTS IN SEPARATING TIN FROM TIN PLATE SCRAP OR TINNED
ARTICLES A communication from abroad by Louis Bourau of Paris France.
"
When it is desired to recover the metals which compose tin plate it is necessary
not only to separate thein but to do so in such manner that the tin is completely
removed from the iron and that on the other hand no iron salts are found mixed
with the tin salts.
The process which is employed is as follows:-
A cylinder made of oak is placed on two supports. This cylinder has a door
which closes hermetically by means of a pressure screw.
The tin plate to be treated is introduced into this cylinder wherein is placed a
quantity of chloride of tin that is to say hydrochloric acid saturated with almost
sufficient to fill the cylinder then a quantity of hydrochloric acid is added sufficient
to convert the tin under operation into chloride of tin the acid being slightly in
excess. A. lentiform vessel where steam arrives permits the liquid to be heated
during the operation.
During the working the cylinder has a rotary movement which shakes the metal
on which the acid operates.
When all the tin has been dissolved the chloride of tin is allowed to run off
through a tap placed on the cylinder for which care must be taken in turning
properly into a reservoir placed below the cylinder
Then the cylinder is turned in such way that the door is below which door is
then opened and all the iron resulting from the operation falls into a vessel or

page_text: cart which is placed underneath the cylinder which said cart or vessel then empties
itself into a bath which contains an alkaline substance or pure water forming a
sort of Irish river.
This bath carries at its bottom an endless cloth which slowly carries off the
metal outwardly which falls into a cart or vessel placed at the extremity of this
bath and when said cart is full it is replaced by another and so on.
The chloride of tin thus formed may be treated by water in excess in such a
manner as to transform it into oxychloride which after convenient filtration and
treatment by the usual process, is mixed with charcoal and gives by fusion
chemically pure tin.
The chloride of tin may also be treated by zinc and converted into chloride of
zine. The tin then put at liberty in the chloride zinc is collected and freed, either
by heat or by energetic pressure, from the acid which it is mixed with then it is
melted in a convenient oven.
. It can afterwards be cast in moulds for the market.
The iron resulting from the operation is brittle and valueless thus it ought only
to be employed to make sulphides under the treatment by sulphuric acid.
The apparatus is constructed as follows:-A cylinder is provided made of wood
or copper mounted on two pivots of large enough diameter said pivots being
hollow and communicating with the interior of the cylinder. This said cylinder is
provided with a door along the whole of its length which is kept closed by means
of a pressure screw carried on a piece of wood or metal or any hard substance said
screw pressing firmly on a band of thick copper thereby assuring the perfect closing
of the door said door working on an india-rubber hinge which serves to keep the
apparatus steam tight.
On one side of said cylinder is provided a pipe in connection with the heating
apparatus said tube terminating in a copper collar piece perfectly polished and is
supported against a projecting piece set completely up to the right hand pivot.
A spiral spring serves to assure the perfect contact of the said collar and
projecting piece.
The pivot on the right hand side of the cylinder' carries a tube which is in
communication with a lentiform vessel placed at the end. The rotation of the
cylinder will not prevent the perfect communication of the steam.
On the other side is a second pipe which is terminated in a similar manner to
the first mentioned pipe by a collar piece which comes in contact with another
collar piece by means of a spiral spring. Another pipe is fixed in the left hand
pivot. It is set vertically and is always in place at the top of the cylinder. The
aforesaid second pipe carries three branches each provided with a cock-the first
branch ought to be open during the whole operation to allow of the escape of the
gases and oxide vapours. A suitable retort receives these vapours and separates
the acid therefrom by condensation-the second branch serves for the introduction
of the chloride of tin or the bydrochloric acid-and the third serves for the
washing if it is desired in the cylinder directly; either an alkaline liquid or pure
water being introduced by this branch. A tap is fixed on the cylinder for
emptying the liquids therefrom".

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Walter Alfred Barlow in the Great Seal Patent Office on the
30th September 1882.
WALTER ALFRED BARLOW of 6 St. Pauls Churchyard in the city of London
Patent Agent and Engineer. IMPROVEMENTS IN SEPARATING TIN FROM TIN-PLATE
SCRAP OR TINNED ARTICLES A communication from abroad by Louis Bourau of
Paris France
"
When it is desired to recover the metals which compose tin-plate it is necessary
not only to separate them but to do so in such manner that the tin is completely
recovered from the iron and that on the other hand no salts of iron be found in
mixture with the salts of tin.
The process employed is as follows:-A cylinder made of oak is placed on two
supports by means of trunnion ends in such way that it can at will be turned on
these supports. This cylinder has a door which closes hermetically by means of a
copper band and a pressure screw.
The tin-plate to be treated is introduced into this cylinder wherein is placed a
quantity of chloride of tin that is to say with hydrochloric acid saturated with tin
almost sufficient to fill the cylinder then a quantity of hydrochloric acid is added
sufficient to convert the tin under operation into chloride of tin the acid being
slightly in excess.
A steam vessel provided internally of the cylinder permits of the liquid to be
heated during the operation.
During the working the cylinder has a rotary movement which shakes the
metal on which the acid operates.
When all the tin has been dissolved the chloride of tin is allowed to run off
through a tap into a reservoir placed below the cylinder. Then the cylinder is
turned in such way that the door is below which door is then opened and all the
iron resulting from the operation falls into a vessel or cart placed underneath the
cylinder said cart or vessel then emptying itself into a bath which contains an
alkaline substance or pure water.
This bath carries at its bottom an endless cloth or creeper which slowly carries
off the metal outwardly, which falls into la cart or vessel placed at the extremity
of this bath and when said cart is full it is replaced by another and so on.
The chloride of tin thus formed may be treated by water in excess in such a
manner as to transform it into oxychloride which after convenient filtration and
treatment by the usual processes is mixed with charcoal and gives by fusion
chemically pure tin.
The chloride of tin may also be treated by zinc and converted into chloride of
zinc.
The tin then put free in the chloride of zinc is collected and freed from the acid
which it is mixed with then either by heat or by energetic pressure it is melted in
a convenient oven.
The iron resulting from the operation is brittle and valueless thus it ought
only to be employed to make sulphides under the treatment by sulphuric acid.
In the accompanying drawings:
=
Fig 1 shows one of the rotary cylinders employed in this invention.
Fig 2. a cross section of Fig 1.
Fig 3. shows the spiral spring for assuring the contact between the collar piece
and projecting piece.
A cylinder A made of wood or copper is mounted on two hollow trunnions H H³
of sufficiently large diameter said trunnion ends communicating with the interior

page_text: "
of the cylinder A, said cylinder being provided with a door B along the whole of
its length which door is kept closed by means of a thick copper band E firmly
pressed down into position by means of a pressure screw D said pressure screw D
being carried or mounted on a piece of wood metal or any other hard substance.
Said door E is provided with an india rubber hinge F thereby making the apparatus
steam-tight buttons or stud pieces G being provided for purpose of opening and
closing the door.
On one side of said cylinder A is a pipe I in connection with the heating
apparatus said pipe terminating in a perfectly polished copper colar piece M
supported by a projecting piece N set completely up to the trunnion end H.
A spiral spring R serves to assure the perfect contact of the said collar piece M.
and projecting piece N (see Fig 3)
The trunnion end H carries a tube I' which is in communication with a lentiform
vessel 12 placed at the end thereof. The rotation of the cylinder A will not prevent
the perfect communication of the steam. On the other side is a second pipe K
which is terminated in a similar manner to the first mentioned pipe I by a similar
collar piece M which comes in contact with another collar piece N by means of a
spiral spring R. Another pipe K' is fixed in the trunnion end 'H' it is set
vertically and is always in place at the top of the cylinder. The pipe K carries
three branches each provided with a cock-the first branch 1 ought to be open
during the whole operation to allow of the escape of the gases and acid vapours.
A suitable retort receives these vapours and separates the acid therefrom by con-
densation. The second branch 2 serves for the introduction of the chloride of tin
or the hydrochloric acid and the third 3 serves for the washing if it is desired in
the cylinder directly; either in alkaline liquid or pure water being introduced
by this branch. A tap Z is fixed on the cylinder for emptying the liquids
therefrom.
Having thus described the nature and particulars of the said Invention I
claim:
'
Firstly. The treatment of tin plate scrap by a chloride of tin containing only a
quantity of acid which correspond to the quantity of tin to be dissolved as set
forth.
Secondly. The mode of operating which consists in treating by heat the tin
plate scrap by means of the apparatus and process herein described.
Thirdly. The apparatus as herein described.
Fourthly. The transformation from chlorides into oxychlorides as herein
described.
Fifthly. The treatment of the chloride of tin by the zinc for the recovery of the
tin and the employment of heat and of compression to eliminate the acid, mixed
with it as herein described.
.
Sixthly. The combination of.an apparatus with a column of condensation per-
mitting of the collection of the acid vapours which without that would be carried
away as herein described.
Seventhly. The combined method of treatment of process hereinbefore described
for the purpose of recovering the metals composing the tin-plate scraps as set forth.
In witness whereof I the said Walter Alfred Barlow have hereunto set my
hand and seal this 28th day of September in the year of our Lord one
thousand eight hundred and eighty two.
WALTER A. BARLOW. (L.S.)