IMPROVEMENTS IN THE TREATMENT OF PHOSPHATIC SLAGS FOR THE PRO- DUCTION OF PHOSPHATES OF EARTHS AND MANGANESEOUS OXYDES OF IRON
Year: 1883

page_text: LETTERS PATENT to Carl Pieper, Civil Engineer and Patent Agent resident
at 109-110 Gneisenaustrasse, Berlin, S.W., Prussia-for an Invention of
"IMPROVEMENTS IN THE TREATMENT OF PHOSPHATIC SLAGS FOR THE PRO-
DUCTION OF PHOSPHATES OF EARTHS AND MANGANESEOUS OXYDES OF IRON ""
A communication to him from Carl Scheibler, Professor of Chimistry at Berlin,
Kingdom of Prussia, German Empire"
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office
of the Commissioners of Patents on the 15th May 1883.
CARL PIEPER, Civil-Engineer and Patent Agent, resident at 109/110, Gneisenau-
strasse, Berlin, S.W., Prussia, "IMPROVEMENTS IN THE TREATMENT OF PHOSPHATIC
SLAGS FOR THE PRODUCTION OF PHOSPHATES OF EARTHS AND MANGANESEOUS
OXYDES OF IRON," a communication to me from Carl Scheibler, professor of .
chemistry, residing in Berlin, kingdom of Prussia, German Empire,
This invention relates to improvements in the method of treating slags to obtain
therefrom phosphates of earths and manganeseous oxydes of iron described in the
specifications of the British Letters patent No 5835 A.D 1882 and No 1602
A.D. 1883
According to the aforesaid specifications the slag is first reduced to a fine powder
by mechanical means, and the powdered slag roasted in an oxydizing flame in
order to convert the protoxydes of iron and manganese into sesquioxydes and
combinations of sesquioxydes with protoxydes.
The present invention has for its object to obtain the finely powdered oxydized
slag without the use of any special disintegrating apparatus in a much simpler
manner.
For this purpose the slags are roasted in lumps of about a fist's thickness in
oxydizing flame, and the so roasted lumps are exposed to the action of water or
steam. This has the effect that the caustic lime contained in the slag combines
with the water to hydrate of lime, and the reaction will make the lumps break up
in fine powder.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Pieper in the Great Seal Patent Office on the 10th November
1883.
:
CARL PIEPER, Civil-Engineer and Patent Agent, resident at 109/110. Gneisenau-
strasse, Berlin S.W., Prussia "IMPROVEMENTS IN THE TREATMENT OF PHOSPHATIC
SLAGS FOR THE PRODUCTION OF PHOSPHATES OF EARTHS AND MANGANESEOUS
OXYDES OF IRON," a communication to me from Carl Scheibler, doctor of philosophy,
of Berlin, Prussia
This invention relates to improvements in the method of treating slags to obtain
therefrom phosphates of earths and manganesous oxydes of iron, described in the
specifications of the British letters patent No. 5835 A.D. 1882, and No 1601
A.D. 1883.
.
According to the aforesaid specifications the slag is reduced to a fine powder by
mechanical means, and the powdered slag roasted in oxydizing flame in order to
convert the protoxydes of iron and manganese into sesquioxydes and combinations
of sesquioxydes with protoxydes. The present invention has for its object to
obtain the finely powdered oxydized slag without the use of any special
disintegrating apparatus in a much simpler and therefore cheaper manner.
The inventor has found that the purpose of roasting the slags in finely subdivided
state viz. the complete conversion of the protoxydes of iron and manganese into
sesquioxydes and combinations of sesquioxydes with protoxydes as well as the
transition of the phosphoric acid and the decomposition of the sulfides-is also
attained by roasting the slags in the form of coarse lumps under abundant
admission of air. When the roasted lumps are now exposed to the action of water
or steam, they break up in a fine powder. This is owing to the caustic lime
contained in the slag, combining with the water to hydrate of lime and causing a
chemical reaction which has the effect that the lumps break up in very fine
powder.
The slags are roasted preferably in lumps of about a fist's thickness.*
Having thus described the nature and object of this invention, and the manner
in which it is to be carried out in practice, as communicated to me by my
correspondent, I hereby claim as new and essential feature of the same:
The transformation of phosphatic slags into a fine powder in which the
protoxydes of iron and manganese are converted into sesquioxydes and combinations
of sesquioxydes with protoxydes, by reducing the slags to lumps, roasting the
lumps in oxydizing flame, and then exposing the same to the action of steam or
water, substantially as and for the purpose stated.
In Witness whereof I, the said Carl Pieper, have hereunto set my hand and
seal this thirty-first day of October in the year of our Lord One thousand eight
hundred and eighty-three.
CADT DIGDED
CARL DIEDED
(LS)