Improvements in the Manufacture of Ferric Oxides.
Year: 1896

page_text: Date of Application, 16th June, 1896
Complete Specification Left, 16th Mar., 1897-Accepted, 17th Apr., 1897
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Ferric Oxides.
We, ATKINSON CROSSLEY, of Beili Glas, Cwmavon, in the County of
Monmouth, Manufacturing Chemist, and HOWARD ASTON ALLPORT, of
Dodworth Grove, near Barnsley, in the County of York, Colliery Proprietor,
do hereby declare the nature of this invention to be as follows:-
In the manufacture of ferric oxides, it is usual to obtain them by calcining
sulphate of iron in suitable furnaces, in the manner described in the Specification
of Letters Patent, No. 2618, A.D. 1894.
My present invention relates to a novel method of manufacturing such ferric
oxides, by the admixture of oxidizing agents with the sulphate of iron.
In order to put my invention in operation, I mix with the sulphate of iron,
either before or after the dehydration and grinding of the latter, a sufficient
quantity about one per cent., which however may be varied more or less to suit
varying circumstances, of nitrate of soda, or other like oxidizing agent-such as
nitrate of potash or chlorate of potash,-which will not injuriously affect the
scarlet, red, and purple colours resulting from the different methods of calcination.
I mix this oxidizing agent with the sulphate of iron previous to calcination, in a
wet state, and bring the mixture to the consistence of a stiff paste, which I charge
into the calcining furnace in the usual way.
By this improved process, the sulphuric acid is liberated at a much lower
temperature than in the ordinary method of manufacture, and the resulting colours
are improved both in brilliancy, body, and softness of texture.
Dated this 20th day of May 1900
EDWARDS & Co.,
65 and 66, Chancery Lane, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Ferric Oxides.
We, ATKINSON CROSSLEY, of Beili Glas, Cwmavon, in the County of
Monmouth, Manufacturing Chemist, and HowARD ASTON ALLPORT, of
Dodworth Grove, near Barnsley, in the County of York, Colliery Proprietor,
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, that is to say :-
In the manufacture of ferric oxides, it is usual to obtain them by calcining
sulphate of iron in suitable furnaces, in the manner described in the Specification
of Letters Patent granted to Atkinson Crossley, dated the 6th day of February,
A.D. 1894, and numbered 2618, for "Improvements in apparatus for producing
ferro-terric and ferric oxides."

page_text: The present invention relates to a new or improved method of manufacturing
such ferric oxides, by the admixture of suitable oxidizing agents with the sulphate
of iron.
In order to put the invention in operation, we mix with the sulphate of iron,
either before or after the dehydration and grinding of the latter, a sufficient
quantity, about one per cent., which however may be varied more or less to suit
varying circumstances, of nitrate of soda, or other like oxidizing agent-such as
nitrate of potash or chlorate of potash,-which will not injuriously affect the
scarlet, red, and purple colours resulting from the different methods of calcination.
We mix this oxidizing agent with the sulphate of iron previous to calcination, in
a wet state, and bring the mixture to the consistence of a stiff paste, which we charge
into the calcining furnace in the usual way.
By this improved process, the sulphuric acid is liberated at a much lower
temperature than in the ordinary method of manufacture, and the resulting colours
(used in the manufacture of paints) are improved both in brilliancy, body, and
softness of texture.
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 manufacture of ferric oxides the addition of an oxidizing agent, such
as nitrate of soda, nitrate of potash, or chlorate of potash, to the sulphate of
iron used in the manufacture, the mixture being then calcined in the usual way,
substantially in the manner and for the purpose described.
EDWARDS & Co.,
65 and 66, Chancery Lane, London, Agents for the Applicants.