Improvements in Obtaining or Reforming Manganese Peroxide for Use in Obtaining Chlorine and otherwise.
Year: 1893

page_text: Date of Application, 24th June, 1893-Accepted, 19th Aug., 1893
COME LINIE SPECIFICATION.
Improvements in Obtaining or Reforming Manganese Peroxide for
Use in Obtaining Chlorine and otherwise.
We, ARCHIBALD CAMPBELL, of 42, Whittaker Road, Upton Park, in the
County of Essex, Technical Chemist, and WILLIAM BOYD, of The Fife Chemical
Works, Thornton, in the County of Fife, North Britain, 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, that is to say :-
Our said invention has principally for its object the reforming of manganese
peroxide which has been used in obtaining chlorine, in an improved and economical
manner, and for that purpose to treat manganese sulphate resulting as a bye
product in certain processes for obtaining chlorine. Our invention is however
also applicable to manganese sulphate however obtained, and the resulting manganese
peroxide which is very pure is applicable for various purposes besides obtaining
chlorine.
The
In carrying out our invention we may convert the manganese sulphate first into
carbonate and subsequently into peroxide, or we may convert it directly into
peroxide. According to one modification we form a solution of the manganese
sulphate of a strength of 1.30 to 1.35 specific gravity, and after settling out
impurities we mix therewith in equivalent proportions a solution of soda mono-
carbonate preferably obtained from crude soda bicarbonate in the ammonia-soda
process in the manner described in Patent Specification, No. 21,071 of 1890.
solutions are thoroughly mixed with agitation and heat is preferably applied to
facilitate settling and filtration. By this operation manganese carbonate and soda
sulphate are obtained in a state of great purity. The manganese carbonate may
be converted into peroxide by furnacing according to the Dunlop process; or it
may, in a series of bogies having shelves and travelling through a tunnel or flue
be subjected to a current of air travelling in the opposite direction and heated to a
temperature of 620 to 650 degrees Fahrenheit.
According to another modification we convert the solution of soda mono-carbonate
into one of caustic soda by means of lime, and having transferred the solution
to an ordinary Weldon oxidizer we cause air to be blown through it whilst slowly
running into it a concentrated solution of the manganese sulphate. The manganese
is rapidly oxidized whilst the mixture remains alkaline, but when neutrality has
been reached the blowing is to be continued for some time to insure a maximum
degree of oxidation.
The manganese peroxide is precipitated leaving soda
sulphate in solution to be separated by decantation or filtration and utilised in any
desired way.
We prefer to effect the oxidation in a rotational series of vessels,
the air being passed in succession through vessels in each following one of which
the solution has been under treatment for a shorter time.
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. Obtaining or reforming manganese peroxide for use in obtaining chlorine and
otherwise, by first converting manganese sulphate into manganese carbonate and
subsequently oxidizing the carbonate substantially as hereinbefore described.
2. Obtaining or reforming manganese peroxide for use in obtaining chlorine and

page_text: otherwise, by running manganese sulphate into a solution of caustic soda and
blowing air through the mixture substantially as herein before described.
Dated this Twenty-third day of June 1893.
EDMUND HUNT,
Applicants' Agent.