Improvements in the Means or Method of Manufacturing Ferric . Sulphate.
Year: 1897

page_text: Date of Application, 1st Apr., 1897
Complete Specification Left, 3rd Jan., 1898-Accepted, 19th Feb., .1898
PROVISIONAL SPECIFICATION.
Improvements in the Means or Method of Manufacturing Ferric .
Sulphate.
We, WILFRID WYLD, of Frizinghall Chemical Works, Bradford, in the County
of York, Chemist, and JOHN HENRY Cox, Member of the Institute of Civil
Engineers and Borough Surveyor, Town Hall, Bradford, aforesaid, do hereby
declare the nature of this invention to be as follows:-
This invention relates to improvements in the means or method of manufacturing
persulphate of iron or ferric sulphate by the combination of sulphuric acid with oxide
of iron, and its object is to facilitate the process.
When sulphuric acid is manufactured in the ordinary way the process of manu-
facture leaves it at a high temperature and we find that if at approximately this
temperature it is mixed in proper proportions with "burnt" pyrites or other suitable
oxide of iron that the temperature is sufficient to enable the acid and oxide to
combine and form ferric sulphate.
The sulphurous fumes thrown off during the process may be collected and
condensed.
If we use the oxide of iron forming the residuum when sulphuric acid is manu-
factured from sulphuretted oxide used for purifying gas we prefer to treat it whilst
still in a heated state. In this case cold acid may be used as the heat of the oxide
is sufficient to enable the chemical combination to take place but we prefer to use
hot acid.
Dated this 21at dov of March 1897
DRACUP & NOWELL,
Patent Agents, Bradford.
COMPLETE SPECIFICATION.
Improvements in the Means or Method of Manufacturing Ferric
Sulphate.
We, WILFRID WYLD, of Frizinghall Chemical Works, Bradford, in the County
of York, Chemist, and JoпN HENRY Cox, Member of the Institute of Civil
Engineers and Borough Surveyor, Town Hall, Bradford, aforesaid, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to improvements in the means or method of manufacturing
persulphate of iron or ferric sulphate by the combination of sulphuric acid with a
suitable oxide of iron, and its object is to facilitate the process.

page_text: When sulphuric acid is manufactured in the ordinary way the process of manu-
facture leaves it at a high temperature and we find if at approximately this tempera-
ture it is mixed in proper proportions with "burnt' iron pyrites ground or
powdered to a fine state or other suitable oxide of iron prepared by grinding it
necessary, that the temperature is sufficient to enable the acid and oxide to combine
and form ferric sulphate.
The sulphurous fumes and dust thrown off during the process may be "draughted"
to a flue or flues and be collected in a tower or its equivalent.
<<
"
If we use the oxide of iron forming the residuum when sulphuric acid is manu-
factured from sulphuretted oxide used for purifying_gas, we prefer to treat it as
it leaves the furnaces whilst still in a heated state. In this case cold acid may be
used, as the heat of the oxide is sufficient to enable the chemical combination to
take place, but we prefer to use hot acid.
•
To carry out our invention we take say five cwts. (560 lbs.) of sulphuric acid of
commerce (144° Twaddle or thereabouts) in a heated state direct from the Glover
tower or other apparatus in which it is manufactured, and convey it to an iron pan
of suitable dimensions and preferably of circular form: Into this we add about
2 cwts. of oxide of iron. The admixture of the oxide may be carried out in from 7
to 10 minutes and the mass should be thoroughly stirred until it begins to thicken
and bubbles of gas appear at the surface. Then it is allowed to remain until action
ceases when the pan may be emptied and recharged.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed; we declare that what
we claim is;-
-
1. The method of forming ferric sulphate by the combination with sulphuric acid
in the heated state as delivered from the apparatus in which it is manufactured, of
oxide of iron in the heated state in which it leaves the sulphuric acid manufacturing
apparatus, substantially as herein shown and described.
2. The method of forming ferric sulphate by the combination with sulphuric acid in
the heated state as delivered from the apparatus in which it is manufactured, of a
suitable oxide of iron, substantially as herein shown and described.
3. The method of forming ferric sulphate by the combination with oxide of iron
in the heated state in which it leaves the sulphuric acid manufacturing apparatus,
of sulphuric acid, substantially as herein shown and described.
Dated this 31st day of December 1897.
DRACUP & NOWELL,
Patent Agents, Bradford.