Improvements in and connected with the Utilization of Sulphate of Iron Galvanizing Pickle.
Year: 1889

page_text: Date of Application, 29th June, 1889
Complete Specification Left, 26th Mar., 1890-Accepted, 3rd May, 1890
PROVISIONAL SPECIFICATION.
Improvements in and connected with the Utilization of Sulphate of
Iron Galvanizing Pickle.
We, THOMAS PARKER of Newbridge Wolverhampton in the County of Stafford,
Electrical Engineer, and ALFRED EDWARD ROBINSON, of Commercial Road Wolver-
hampton in the County of Stafford, Technical Chemist, do hereby declare the nature
of this invention to be as follows:-
This Invention relates to the treatment and utilization of the waste pickle produced
by the cleansing of iron by means of sulphuric acid for galvanization.
According to these Improvements we evaporate the waste or exhausted pickle in
iron vessels and in contact with scrap iron (in order to neutralise any free acid) to a
specific gravity of about 14 to 1.5. To the concentrated pickle we then add in a
suitable vessel, a sufficiency of strong sulphuric acid to precipitate the iron. The
precipitate will be anhydrous sulphate of iron and after separation it may be utilized
in the manufacture of fuming or Nordhausen sulphuric acid or otherwise. After the
precipitation of the sulphate of iron the supernatant sulphuric acid may be decanted
or otherwise recovered and be again used in a subsequent similar operation.
ليمي
T
D 1000
WILLIAM E. HEYS,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in and connected with the Utilization of Sulphate of
Iron Galvanizing Pickle.
We, THOMAS PARKER of Newbridge Wolverhampton in the County of Stafford,
Electrical Engineer, and ALFRED EDWARD ROBINSON of Commercial Road Wolver-
hampton in the County of Stafford, Technical Chemist, do hereby declare the nature
of this invention, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-—
This Invention relates to the treatment and utilization of waste pickle produced in
the cleansing or preparation of iron by means of a sulphuric acid solution for galvanizing
and similar purposes.
According to these Improvements we evaporate the waste pickling solution in
contact with iron in order to neutralise any free or uncombined acid, to a specific
gravity of about 1.4 or 1.5.
The evaporation is preferably conducted in iron vessels in which scrap iron or
iron borings or turnings is or are contained and by means of artificial heat.
To the concentrated neutral pickle thus obtained there is then added a sufficiency of
strong sulphuric acid to precipitate the iron.
The supernatent solution may be drawn off or be otherwise separated as is well
understood and employed in the preparation of a second pickling solution or be
otherwise utilised.
The precipitate consists of anhydrous sulphate of iron and this we prefer to distil
and manufacture into fuming or Nordhausen sulphuric acid in the ordinary and well
known manner.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed, we declare that what we
claim is,
(1) In the treatment of waste sulphuric acid pickle which has been employed in

page_text: cleansing iron, evaporating the waste pickle in contact with metallic iron, and precipi-
tating anhydrous sulphate of iron from the concentrated solution by means of
sulphuric acid, substantially as and for the purpose hereinbefore described.
(2) In the treatment of waste sulphate of iron solutions, precipitating anhydrous
sulphate of iron suitable for use in the manufacture of fuming sulphuric acid from 5
the concentrated neutral solution, substantially as and by the means herein before
described.
1
WILLIAM E. HEYS,
Agent for the Applicants.