IMPROVEMENTS IN TREATING AND UTILIZING WASTE SULPHATE OF IRON SOLUTION ARISING FROM THE CLEANSING. OF IRON SURFACES IN THE MANUFACTURE OF TIN PLATES
Year: 1868

page_text: LETTERS PATENT to Frederick Braby, of Camberwell, in the County
of Surrey, for the Invention of "IMPROVEMENTS IN TREATING AND
UTILIZING WASTE SULPHATE OF IRON SOLUTION ARISING FROM THE CLEANSING.
OF IRON SURFACES IN THE MANUFACTURE OF TIN PLATES."
Sealed the 26th January 1869, and dated the 19th August 1868.
PROVISIONAL SPECIFICATION left by the said Frederick Braby at
the Office of the Commissioners of Patents, with his Petition, on.
the 19th August 1868.
I, FREDERICK BRABY, of Camberwell, in the County of Surrey, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
TREATING AND UTILIZING WASTE SULPHATE OF IRON SOLUTION ARISING FROM THE
CLEANSING OF IRON SURFACES IN THE MANUFACTURE OF TIN PLATES," to be
as follows:-
In the manufacture of tin plates the iron surfaces or sheets are
cleansed by means of sulphuric acid and water, and a crude solution
of sulphate of iron is thus produced and commonly thrown to waste.
Now in my Invention I treat this solution in such a way as to produce
certain useful products, which vary according to the means employed.

page_text: 1st. I add ammonia derived from any source to the waste solution
above named till complete decomposition results and I prefer to effect
this by blowing through a solution of ammonia, and then conducting the
blast loaded with the volatile alkali through the solution to be decom-
posed as above, in accordance with a Patent, No. 2067, for which
Provisional Protection was granted to Isham Baggs and Frederick Braby
on the 27th of June 1868. In this decomposition the results are oxide
of iron, which falls and must be washed and dried at a low red heat for
commercial uses; and sulphate of ammonia, which must be filtered,
boiled down, and crystallized..
2nd. I add carbonate of ammonia, or blow carbonic acid and ammo-
niacal gases through the crude solution of sulphate of iron, in accordance
with the plan of action described under the same Patent, No. 2067.
The results of decomposition in this case are carbonate of iron and
sulphate of ammonia, which are treated in the same way as the products
last mentioned.
3rd. To the crude solution of sulphate of iron I add a further. portion
of sulphuric acid, and then blow air through the mixture, or cause air
to come in intimate contact with it, whereby persulphate of iron is
produced, applicable to various useful purposes.
4th. I neutralize the crude solution of sulphate of iron by any con-
venient means, as by adding thereto scrap iron or finely powdered oxide
of iron, and boiling or digesting at lower temperatures. I then mix this
solution with a soluble salt of baryta, lime, or lead, whereby useful
results are produced, the sulphate being precipitated, and the salt of
iron, as the chloride, acetate, or otherwise, remaining in solution.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Frederick Braby in the Great Seal Patent Office
on the 10th February 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FREDERICK 3
BRABY, of Camberwell, in the County of Surrey, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of August, in the year of
our Lord One thousand eight hundred and sixty-eight, in the thirty-

page_text: second year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Frederick Braby, Her special licence that
I, the said Frederick Braby, my executors, administrators, and assigns,
or such others as I, the said Frederick Braby, my executors, adminis-
trators, and assigns, should at any time agree with, and no others, from
time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN TREATING
AND UTILIZING WASTE SULPHATE OF IRON SOLUTION ARISING FROM THE CLEANSING
OF IRON SURFACES IN THE MANUACTURE OF TIN PLATES," upon the condition
(amongst others) that I, the said Frederick Braby, my executors or
administrators, by an instrument in writing, under my, or their, or one
of their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date
of the said Letters Patent.
NOW KNOW YE, that I, the said Frederick Braby, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement, that is to say :-
In the manufacture of tin plates the iron surfaces or sheets employed
are cleansed by means of diluted sulphuric acid, and a crude solution of
sulphate of iron is thus produced which is commonly thrown away as
being useless. My present Invention consists in treating this solution
in such a way as to produce certain useful products, which vary in their
nature according to the means employed.
I will describe seriatim the processes which I employ.
First. I add ammonia derived from any source to the waste product
above mentioned until complete decomposition takes place, and I prefer
to effect this by blowing air through a solution of ammonia, and then
conducting the blast loaded with the volatile alkali through the solution
to be decomposed, in accordance with an Invention for which a Patent
bearing date the Twenty-seventh day of June One thousand eight
hundred and sixty-eight, Number 2067, was granted to Isham Baggs
and myself. The results of this decomposition are oxide of iron, which
falls and must be washed and dried at a low red heat for commercial

page_text: uses; and sulphate of ammonia, which must be filtered, boiled down, and
crystallized.
Second. I add carbonate of ammonia, or blow carbonic acid and
ammoniacal gases through the crude solution of sulphate of iron, also in
accordance with the plan described in the Specification of the Invention
before referred to. The results of decomposition in this case are
carbonate of iron and sulphate of ammonia, which latter is treated
in the same way as the product resulting from the first-mentioned
process.
Third. I neutralize the crude solution of sulphate of iron by any
convenient means, as, for instance, by adding thereto. scrap iron or finely
powdered oxide of iron, and boiling or digesting the same at a low
temperature; I then mix the solution with a soluble salt of baryta,
lime, or lead, whereby useful results are obtained, the sulphate being
precipitated and the salt of iron, as the chloride, acetate, or other com-
pound, remaining in solution.
Having thus declared and ascertained the nature of the said Invention,
and the manner in which it is to be performed, I would observe in
conclusion that what I consider novel and original, and therefore claim
às constituting the Invention secured to me by the said herein-before
in part recited Letters Patent are, the methods herein-before described
and set forth of utilizing the waste sulphate of iron solution resulting
from the cleansing of iron surfaces in the manufacture of tin plates,
or any mere modifications thereof.
In witness whereof, I, the said Frederick Braby, have hereunto
set my hand and seal, this Twenty-eighth day of January,
in the year of our Lord One thousand eight hundred and
sixty-nine.