Improvements in the Utilisation of Waste Pickle from Tinning and Galvanizing Works where Hydrochloric Acid is Used for Pickling.
Year: 1888

page_text: Date of Application, 9th Nov., 1888
Complete Specification Left, 14th Mar., 1889
Complete Specification Accepted, 25th May, 1889
OITICATION,
Improvements in the Utilisation of Waste Pickle from Tinning
and Galvanizing Works where Hydrochloric Acid is Used for
Pickling.
I, HENRY JAMES KIRKMAN, of the Landore Alkali Works, Swansea, Analytical
Chemist, do hereby declare the nature of this invention to be as follows:-
In accordance with my Invention I run the waste Pickle (which consists essentially
of Chloride of Iron and free Hydrochloric Acid) into suitable vessels. Any dirt,
grit or other extraneous substances is then separated from the liquor either by filtration
or allowing it to settle. At this stage of the process, if any Sulphates are present in
the liquor and it is desirable to get rid of them, this can be effected now, before
settling or filtering takes place, by means of Calcium Chloride or Barium Chloride.
To the clear solution is then added any of the following compounds-Lime-(pre-
ferably as Milk of Lime) Limestone, Chalk, Oxide of Magnesia, Carbonate of
Magnesia, Gas Liquor, Ammonia, Sodium Hydrate, Sodium Carbonate-to neutralise
the free Acid and precipitate the Iron. The precipitate thus obtained is separated by
suitable means froin the liquor in which it was precipitated, and, having been washed
and dried, it can then be mixed with sawdust or such like material and used for-
amongst other purposes-purifying illuminating gas, (if used for Gas purification, it
is however unnecessary to separate the Sulphates, grit or other extraneous substances).
After being dried sufficiently, the precipitate is further subjected to heat, the action of
which converts the precipitate into a material suitable for making paint. The salts
contained in the liquor, from which the Iron was precipitated, can be obtained by any
of the well known suitable means.
י.ג.נ
31
AT
JAMES STEVENSON,
Gray's Inn Chambers,
20, High Holborn, W.C.,
Agent for Applicant.

page_text: 1, HENRY JAMES KIRKMAN of the Landore Alkali Works, Swansea, Analytical
Chemist, do hereby declare the nature of this invention and in what manner the
same is to be performed, to he particularly described and ascertained in and by
the following statement :-
My invention, which in its primary application relates to the utilisation of the
waste Pickle from tinning works in which hydrochloric acid is used in the process of
pickling, las for its object a cheap and efficient method of precipitating and recovering
the iron contained in the said waste pickle.
In accordance with my invention I run the waste pickle (consisting essentially of
chloride of iron and free Hydrochloric Acid) into suitable vessels; all dirt, grit or
other extraneous substances being separated from the liquor either by filtration or
allowing it to settle, and the clear liquor siphoned or otherwise drawn off. Should
any sulphates be present at this stage of the process, and their removal deemed
desirable, it can be effected before filtering or settling takes place, by means of Calcium
Chloride or Barium Chloride. To the clear solution is then added any of the following
compounds-Lime (preferably as Milk of Lime) Limestone, Gas liquor, Ammonia,
Sodium Hydrate, Sodium Carbonate, to neutralise the free acid and precipitate the
iron. The precipitate thus obtained is separated by suitable means from the liquor in
which it was precipitated, and, having been washed and dried it can then be mixed
with sawdust or such like material and used for-amongst other purposes-purifying
illuminating gas. If used in gas purification however, it is unnecessary to separate
the sulphates, grit or other extraneous substances. After being dried sufficiently, the
precipitate is further subjected to heat, the action of which converts said precipitato
into a material suitable for making pigments. The salts contained in the liquor from
which the iron was precipitated can be recovered by any of the well known suitable
means.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I wish it to be under-
stood that I am aware it has already been proposed prior to the date of my invention
to employ magnesia-referred to in my Provisional Specification-as a precipitating

page_text: agent for the separation of the iron from the waste pickle and I make no claim in
respect thereof, but what I claim is :—
In the utilization of waste pickle from tinning works the employment of Lime
(preferably Milk of Lime) Limestone, Chalk, Gas liquor, Ammonia, Sodium Hydrate,
or Sodium Carbonate, for the neutralization of the free Acid and precipitation of the
iron substantially as and for the purposes herein set forth.
JAMES
STEVENSON,
Gray's Inn Chambers,
20, High Holborn, London, W.C.,
Agent for Applicant.
Dated this 23rd day of February 1889.
JAMES STEVENSON,
Gray's Inn Chambers,
20, High Holborn, London, W.C.,
Agent for Applicant.