Year: 1888

page_text: 1, EBENEZER BOWEN of Pontardulais, in the County of Carmarthen, Chemist, do
hereby declare the nature of this invention to be as follows:-
My Invention relates to the treatment of the spent liquor used in pickling iron and
steel plates.
This liquor consists of-after it has done its work in cleaning the plates-sulphate of
iron in solution, with free sulphuric acid.
The usual process for the utilization of this spent liquor being to crystalize the
sulphate of iron out. The mother liquor however always retains a certain quantity of
sulphate of iron and this is allowed to run to waste. The disposal of this residual
liquor is also a source of trouble. My improved treatment consists of bringing
together the amonia liquor,-the by product of gas manufacture-and the spent liquor
above mentioned.
The result being that the amonia combines with the free sulphuric acid and also.
reacts on the sulphate of iron forming sulphate of amonia and precipitating the iron in
the form of hydrate. The supernatant liquor now consisting of sulphate of amonia in
solution, is evaporated to dryness leaving sulphate of amonia-I have now two
products of good marketable value the sulphate of amonia being a valuable manure
and the hydrate of iron may by proper treatment be converted into oxide and employed
for the manufacture of paints or otherwise utilized.
يمي
TI
1000

page_text: COMPLETE SPECIFICATION.
Improved Economic Treatment of Certain By-products of Gas and
Tin-plate Manufactures.
I EBENEZER BOWEN of Pontardulais in the County of Carmarthen, Chemist, do
hereby declare the nature of my invention for IMPROVED ECONOMIC TREATMENT OF
CERTAIN BY-PRODUCTS OF GAS AND TIN-PLATE MANUFACTURES and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
"
My Invention relates to the treatment of the liquor, used in cleaning or pickling
iron and steel plates in the process of the tin plate manufacture, after it has done its
work, or is "spent" for the purpose of utilizing its constituants.
39
In the process of the tin plate manufacture the plates of iron or steel are prepared
for tinning, by what is called "pickling a process for the removal of the scale
formed during the heating and rolling. This pickling consists of immersing the plates
in an acid solution; usually dilute sulphuric acid. When this solution has done a
certain amount of work, it becomes unfit for further use, and now consists of water,
sulphuric acid, and sulphate of iron in solution. Hitherto the usual treatment of this
spent liquor has been, to obtain the sulphate of iron-which has some commercial
value out of the solution by crystallization the remaining liquor having been
allowed to run to waste. This residual liquor, besides giving trouble with reference
to the manner of its disposal;-as it is very injurious to rivers and streams when
allowed to flow into them-carries with it a quantity of sulphate of iron which
cannot, by the above treatment, be economically crystallized out.
My improvement consists in chemically treating the spent liquor in such a way, that
this waste does not occur; besides in obtaining products of a more valuable kind.
It consists in chemically treating the spent liquor, with the amoniacal liquor, the
by-product of the coal gas manufacture, the result being that the amonia combines
with the free sulphuric acid; and also reacts on the sulphate of iron; forming sulphate
of amonia, and precipitating the iron, in the form of hydrate and carbonate of iron.
course ammonia from any other cheap source may be substituted for that obtained from
the gas liquor.
Of
The supernatant liquor, now consisting of sulphate of amonia in solution, is
evaporated and crystallized, leaving sulphate of amonia. There are now two products
of value-sulphate of amonia and hydrate of iron, the first a good manure and the
second may be converted into oxide of iron, and used in the manufacture of paint, or
otherwise.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner, the same is to be performed, I declare that what I
claim is
Treating chemically the spent pickling liquor--of the tin-plate and similar
manufactures, with the amonia got from coal distillation for the production of sulphate
of amonia, and hydrate of iron."
لمد
T
1000