The Manufacture of Ferric Chloride.
Year: 1892

page_text: Date of Application, 15th July, 1892
Complete Specification Left, 15th Apr., 1893-Accepted, 20th May, 1893
PROVISIONAL SPECIFICATION.
The Manufacture of Ferric Chloride.
I, JOHN HOWARD KIDD Engineer of Duke Street, Lower Broughton, Man-
chester do hereby declare the nature of this invention to be as follows:-
To
A nearly saturated solution of calcium chloride is made & mixed into a thin
paste with finely powdered ferric oxide (FeO3) prepared from any iron ore.
this mixture is added just sufficient sulphuric acid to decompose the calcium chloride
& liberate hydrochloric acid, this acid attacks the ferric oxide & forms ferric
chloride, while the calcium sulphate formed by the union of the calcium &
sulphuric acid, precipitates forming a hard cake.
If a strong solution of ferric chloride is required, the cake is placed in water &
the calcium sulphate remains insoluble as a spongy mass, this obviates the difficulty
of separating the bulky precipitate by settling.
Dated this 14th day of July 1892.
JOHN HOWARD KIDD.
COMPLETE SPECIFICATION.
The Manufacture of Ferric Chloride.
I, JOHN HOWARD KIDD, of 43 Victoria Buildings, Manchester, in the County
of Lancaster, Secretary, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to the manufacture of ferric chloride.
In proceeding according to my invention, I take a nearly saturated solution
of calcium chloride and mix it into a thin paste with finely powdered ferric
oxide (Fe2O3) or hydrated ferric oxide (Fe,HO) which may be prepared from
any suitable iron ore or derived from other suitable source. To this paste there
is added just sufficient sulphuric acid to decompose the calcium cliloride and
liberate its hydrochloric acid which then combines with the ferric oxide and forms
ferric chloride. Instead of the free sulphuric acid, I may, as will be obvious,
employ a suitable source of the acid such as acid sulphates.
The result of the reaction is a hard cake of calcium sulphate in which the ferric
chloride is locked or contained. If it be desired to obtain the ferric chloride in
solution, the cake may be placed in water which will dissolve out the chloride,
leaving the calcium sulphate as a spongy mass.
By proceeding as hereinbefore described, that is to say by taking a strong
solution of calcium chloride and mixing it to a thin paste with a ferric oxide or
hydrate, I avoid the difficulty of having to deal with a bulky precipitate which
would require to be separated by sedimentation or filtration, since immediately
upon adding the sulphuric acid, the thin paste is formed into a cake or solid mass
which may be easily dealt with and which may for example, be used in that form
for the purification of sewage.
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 :-
The manufacture of ferric chloride by reacting with sulphuric acid or a source

page_text: of sulphuric acid upon a thin paste composed of a strong solution of calcium
chloride and a powdered ferric oxide, substantially as hereinbefore described.
Dandhi with law of Al
בד
1802
WILLIAM E. HEYS,
Agent for the Applicant.