A NEW OR IMPROVED PROCESS FOR SEPARATING THE TIN AND IRON CONTAINED IN TIN- PLATE SCRAP AND WASTE TINS
Year: 1879

page_text: LETTERS PATENT to Walter Francis Reid. of 52. Crawshay Road, Brixton, in
the County of Surrey, Civil Engineer, for the Invention of "A NEW OR
IMPROVED PROCESS FOR SEPARATING THE TIN AND IRON CONTAINED IN TIN-
PLATE SCRAP AND WASTE TINS."
Sealed the 14th May 1880, and dated the 19th November 1879.
PROVISIONAL SPECIFICATION left by the said Walter Francis Reid at the
Office of the Commissioners of Patents on the 19th November 1879.
WALTER FRANCIS REID, of 52, Crawshay Road, Brixton, in the County of Surrey,
Civil Engineer. "A NEW OR IMPROVED PROCESS FOR SEPARATING THE TIN AND
IRON CONTAINED IN TIN-PLATE SCRAP AND WASTE TINS."
This Invention relates to a novel process for separating tin from iron, with a view
to utilizing tin plate scrap & other tinned iron waste, more especially the tins
which have been used for preserving articles of food. In carrying out my Invention
I heat or roast the tin plate scrap or waste tins in any suitable furnace at a red
heat, allowing free access to the oxygen of the atmosphere. The whole of the tin
& part of the iron are thus oxidised, forming a thin brittle coating upon the
surface of the metallic iron which constitutes the bulk of the tin plate. This coating.
which consists of a mixture of ferric & stannic oxides, I separate by mechanical
means from the metallic iron remaining unoxidised. For this purpose I pass the
roasted scrap through edge runners, rollers, or other suitable apparatus. The mixed
ferric & stannic oxides are thus detached & converted into a powder, which I
separate from the metallic iron by means of sieves or in any other suitable manner.
After this operation the metallic iron will be found to be clean & fit for the
market. I recover the tin from the mixture of ferric & stannic oxides by any of
the usual methods adopted for reducing tin from its ores, or I reduce the two metals
in combination at a temperature not sufficient to fuse the iron, & I then extract.
the tin in the wet way by means of acid or alkaline solutions.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Walter Francis Reid in the Great Seal Patent Office on the
14th May 1880.
WALTER FRANCIS REID, of 52, Crawshay Road, Brixton, in the County of Surrey,
Civil Engineer. "A NEW OR IMPROVED PROCESS FOR SEPARATING THE TIN AND
IRON CONTAINED IN TIN PLATE SCRAP AND WASTE TINS."
My said Invention relates to a novel process for separating tin from iron, with a
view to utilising tin-plate scrap and other tinned iron waste, more especially the
tins which have been used for preserving articles of food. In carrying out my
Invention I heat or roast the tin-plate scrap or waste tins in any suitable furnace
at a dull red heat, allowing free access to the oxygen of the atmosphere.
temperature, which I have found to give good results in practice is a temperature
slightly above the melting point of lead. The whole of the tin and part of the iron
are thus oxidised, forming a thin brittle coating upon the surface of the metallic
iron which constitutes the bulk of the tin-plate or other tinned iron waste.
The
This coating, which consists of a mixture of ferric and stannic oxides, 1 separate
by mechanical means from the metallic iron remaining unoxidised. For this
purpose I pass the roasted scrap through edge runners, rollers, or other suitable
apparatus. The mixed ferric and stannic oxides are thus detached and converted
into a powder, which I separate by means of sieves or in any other suitable manner
from the metallic iron which has not been oxidised.
After this operation the metallic iron will be found to be clean and fit for the
market.
I recover the tin from the mixture of ferric and stannic oxides by any of the
usual methods adopted for reducing in from its ores, or I reduce the two metals in
combination at a temperature not sufficient to fuse the iron, and I then extract the
tin in the wet way by means of acid or alkaline solutions.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried into
effect. I would observe in conclusion that what I consider to be novel and original,
and therefore claim as the Invention secured to me by the hereinbefore in part
recited Letters Patent is,--
The peculiar process for separating the tin and iron contained in tinned iron
waste of all kinds, substantially as hereinbefore described.
In witness whereof. I, the said Walter Francis Reid, have hereunto set my
líand and seal, this Thirteenth day of May, in the year of our Lord One
thousand eight hundred and eighty.
WALTER F. REID. (L.S.)
Witness,
EDWIN P. ALEXANDER,
Consulting Engineer and Patent Agent,
14, Southampton Buildings,
Chancery Lane, W.C.