AN IMPROVED PROCESS FOR OXIDISING THE SULPHIDES OF SODIUM AND POTASSIUM IN ALKALINE SOLU- TIONS
Year: 1879

page_text: LETTERS PATENT to Julius Allmann, of Manchester, in the County of
Lancaster, Patent Agent, for the Invention of "AN IMPROVED PROCESS FOR
OXIDISING THE SULPHIDES OF SODIUM AND POTASSIUM IN ALKALINE SOLU-
TIONS." A communication from abroad by Philip Pauli, of Chemische,
Fabrik Rheinau, in the Grand Duchy of Baden, in the Empire of Germany,
Doctor of Philosophy.
Sealed the 1st July 1879, and dated the 18th April 1879.
PROVISIONAL SPECIFICATION left by the said Julius Allmann at the Office
of the Commissioners of Patents on the 18th April 1879.
JULIUS ALLMANN, of Manchester, in the County of Lancaster, Patent Agent.
"AN IMPROVED PROCESS FOR OXIDISING THE SULPHIDES OF SODIUM AND POTASSIUM
IN ALKALINE SOLUTIONS." [A communication from abroad by Philip_Pauli, of
Chemische, Fabrik Rheinau, in the Grand Duchy of Baden, in the Empire of
Germany, Doctor of Philosophy.]
The Invention is particularly applicable in the treatment of lyes or of solutions
of soda or potash for the oxidation of metallic sulphides. To this end a soluble
salt of manganese is added to the alkaline solution to be treated, and air is forced
into the body of the liquid. When carrying the Invention into effect the alkaline
solution is conveyed into a suitable tank, into which air can be forced. A amall
quantity of manganeso chloride or of any other suitable salt of manganese is added
to the contents of the tank, and air is forced into the body of liquid through a
perforated coil or through perforated pipes arranged at the bottom of the tank, or
air is otherwise delivered into the liquid. The added manganese salt is precipi-
tated as an oxide or as oxides of manganese, which take or takes up additional
oxygen from the air which is forced into the liquid and transfers or transfer this
excess of oxygen to the metallic sulphide or sulphides. This action and re-action
of the oxide or oxides of manganese continues until the whole of the metallic
sulphide or sulphides is or are oxidised. In the earlier stages of the process the
liquid is rendered of a milky appearance by the presence of the protoxide of man-
ganese, but when the oxidation of the sulphides is completed the liquid is of a
Pin1

page_text: black or blackish colour, and the process being then completed the treatment with
air is discontinued. The precipitate is then allowed to settle, and the clear super-
natant liquid is run off. A fresh charge of alkaline solution may then be run into
the tank, und the treatment with air may be resumed without any further addition
of the salt of manganese. A comparatively small proportion of the salt of man-
ganese is required, and this may be used in the treatment of a number of charges
of alkaline solution, so that the process is attended with great economy of materials.
When the manganese oxide is considered to be too slow in its action by reason of
the accumulation of impurities the tank is entirely emptied, and for the next
operation a quantity of fresh salt of manganese is added to the charge. The process
is facilitated by heating the alkaline solution to a temperature of about one hundred
and thirty degrees.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Julius Allmann in the Great Seal Patent Office on the 30th
August 1879.
JULIUS ALLMANN, of Manchester, in the County of Lancaster, Patent Agent.
"AN IMPROVED PROCESS FOR OXIDISING THE SULPHIDES OF SODIUM AND POTASSIUM
IN ALKALINE SOLUTIONS." (A communication from abroad by Philip Pauli, of
Chemische, Fabrik Rheinua, in the Grand Duchy of Baden, in the Eupire of
Germany, Doctor of Philosophy.)
This Invention is particularly applicable in the treatment of lyes or of solutions
of soda or potash for the oxidation of metallic sulphides. To this end a soluble
salt of manganese is added to the alkaline solution to be treated, and air is forced
into the body of the liquid. When carrying the Invention into effect the alkaline
solution is conveyed into a suitable tank, into which air can be forced. A small
quantity of manganese, chloride, or of any other suitable salt of manganese is added
to the contents of the tank, and air is forced into the body of liquid through a
perforated coil or through perforated pipes arranged at the bottom of the tank, or
air is otherwise delivered into the liquid. The added manganese salt is precipi-
tated as an oxide or as oxides of manganese, which take or takes up additional
oxygen from the air which is forced into the liquid, and transfers or transfer this
excess of oxygen to the metallic sulphide or sulphides. This action and reaction
of the oxide or oxides of manganese continues, until the whole of the metallio
sulphide or sulphides is or are oxidised. In the earlier stages of the process the
liquid is rendered of a milky appearance by the presence of the protoxide of man-
ganese, but when the oxidation of the sulphides is completed the liquid is of a
black or blackish colour, and the process being then completed the treatment with
air is discontinued. The precipitate is then allowed to settle and the clear super-
natant liquid is run off. A fresh charge of alkaline solution may then be run into
the tank, and the treatment with air may be resumed without any further addition
of the salt of manganese. A comparatively small proportion of the salt of man-
ganeso is required, and this may be used in the treatment of a number of charges
of alkaline solution, so that the process is attended with great economy of materials.
When the manganese oxide is considered to be too slow in its action by reason of
the accumulation of impurities the tank is entirely emptied, and for the next
operation a quantity of fresh salt of manganese is added to the charge. Tho
process is facilitated by heating the alkaline solution to a temperature of about ono
hundred and thirty degrees.
Having now set forth and indicated the nature of the said Invention, and the
manner in which I carry the same into practical effect, I would have it to be
understood in conclusion that I claim,-
First. The process, substantially as and for the purpose hereinbefore set forth and
indicated.
And, Secondly. The employment of a salt of manganese in conjunction with the
injection of air, substantially as and for the purpose set forth and indicated.
In witness whereof, I, the said Julius Allmann, have hereunto set my hand
and seal, this Twenty-eighth day of August, in the year of our Lord One
thousand eight hundred and seventy nine.
JULIUS ALLMANN. (LS)