IMPROVEMENTS IN THE MANUFACTURE OF MAGNESIA
Year: 1881

page_text: LETTERS PATENT to Carl Scheibler, Doctor of Philosophy, of Berlin, Prussia,
German Empire, for an Invention of "IMPROVEMENTS IN THE MANUFACTURE
OF MAGNESIA."
PROVISIONAL SPECIFICATION left by the said Carl Scheibler at the
Office of the Commissioners of Patents on the 22nd January 1881.
CARL SCHEIBLER, Doctor of Philosophy, of Berlin, Prussia, German Empire.
"IMPROVEMENTS IN THE MANUFACTURE OF MAGNESIA."
My process or mode of manufacture depends upon the circumstance that burnt
(consequently caustic) lime dissolves in a water solution of sugar or molasses, while
magnesia is insoluble therein. The magnesia containing limestone, the dolomite or
the lime containing magnesite is burnt; when burnt so far that the carbonic acid
has been expelled I treat the material, by preference pulverized, with a water
solution of sugar or with a molasses solution.
The burnt material may be put into the solution of sugar or molasses, this is to
be preferred, or the solution of sugar or molasses may be poured over it. To reduce
the burnt material before mixing it with the solution it is best to slake it with
little water, producing thus a pulverulent hydrate of lime.
The dissolving of the lime in the solution of sugar or molasses is to be furthered
by stirring, which at the same time prevents the formation of lumps. The solution
of sugar or molasses may suitably be made so thin that it contains about ten to
fifteen per cent. of sugar by volume; this sugar percentage of the solution may
however range within wider limits.
The reaction of the sugar solution on the burnt material, that is the dissolving
of the caustic lime, is very quick, whilst the magnesia as well as the impurities in
the raw material, such as silicic acid, alumina or iron oxydes, remain undissolved.
These impurities will, because of their greater gravity, deposit on the bottom of the
clearing vessel, and are easily separated from the magnesia layer above them. The
undissolved magnesia is separated from the produced sugar lime solution in any of
the well known modes, such as by decanting, by filtration, by filter presses, or by
centrifugal extractors.

page_text: The dissolved caustic lime is next separated from the sugarlime solution either
by introducing carbonic acid or by any of the other known methods. If carbonic
acid is employed herefor it may by preference be obtained from a dolomite or lime
kiln. The gases from the blast furnaces may also be applied to the separation of
the caustic lime from the sugar solution.
The decalcined, that is regenerated, sugar solution obtained from the carbonate
of lime by filtration or otherwise is used over and over again for separating the
caustic lime from the burnt dolomite.
The hydrate of magnesia so produced is suitable for separating and purifying
beetroot and sugar juices, in a quite pure state, as well as when tainted with the
admixtures (impurities) in the raw material, or together with suitable_binding
materials from hydrocarbon containing bodies or the numerous known fluxes as
binding material; it is also suitable for the production of an excellent fireproof
basic lining substance and of fireproof basic bricks and other plastic forms.
my thus produced pure magnesia is used as a fireproof basic lining substance it
has, as against the lime containing fireproof basic furnace linings, the great
advantage that it is unaffected by water, and that the objects formed thereof
both in the air dried and in the burnt state do not crumble in the air or in water.
When

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Schreibler in the Great Seal Patent Office on the 22nd July
1881.
CARL SCHEIBLER, Doctor of Philosophy, of Berlin, Prussia, German Empire.
"IMPROVEMENTS IN THE MANUFACTURE OF MAGNESIA."
My process or mode of manufacture depends upon the circumstance that burnt
(consequently caustic) lime dissolves in a water solution of sugar or molasses, while
magnesia is insoluble therein. The magnesia-containing limestone, the dolomite, or
the lime-containing magnesite is burnt. When burnt so far that the carbonic acid
has been expelled I treat the material, by preference pulverized, with a water
solution of sugar, or with a molasses solution.
The burnt material may be put into the solution of sugar or molasses; this is to
be preferred; or the solution of sugar or molasses may be poured over it. To
reduce the burnt material before mixing it with the solution it is best to slake it
with little water, producing thus a pulverulent hydrate of lime.
The dissolving of the lime in the solution of sugar or molasses is to be furthered
by stirring, which at the same time prevents the formation of lumps. The solution
of sugar or molasses may suitably be made so thin that it contains about ten to
fifteen per cent. of sugar by volume; this sugar percentage of the solution
may however range within wider limits.
The reaction of the sugar solution on the burnt material, that is the dissolving
of the caustic lime, is very quick, whilst the magnesia as well as the impurities in
the raw material, such as silicic acid, alumina or iron oxydes, remain undissolved.
These impurities will, because of their greater gravity, deposit on the bottom of
the clearing vessel, and are easily separated from the magnesia layer above them.
The undissolved magnesia is separated from the produced sugar-lime solution in
any of the well known modes, such as by decanting, by filtration, by filter presses,
or by centrifugal extractors.
The dissolved caustic lime is next separated from the sugar-lime solution either
by introducing carbonic acid or by any of the other known methods. If carbonic
acid is employed herefor it may by preference be obtained from a dolomite or lime
kiln. The gases from blast furnaces may also be applied to the separation of the
caustic lime from the sugar solution.
The decalcined, that is re-generated, sugar solution obtained from the carbonate
of lime by filtration or otherwise is used over and over again for separating the
caustic lime from the burnt dolomite.
The hydrate of magnesia so produced is suitable for separating and purifying
beet root and sugar juices, in a quite pure state, as well as when tainted with the
admixtures (impurities) in the raw material, or together with suitable binding
materials from hydrocarbon containing bodies, or the numerous known fluxes as
binding material, it is also suitable for the production of an excellent fireproof
basic lining substance, and of fireproof basic bricks, and other plastic forms. When
my thus produced pure magnesia is used as a fireproof basic lining substance it has,
as against the lime containing fireproof basic furnace linings, the great advantage
that it is unaffected by water, and that the objects formed thereof, both in the air
dried and in the burnt state, do not crumble in the air or in water.
The novelty of the above described process consists therein that the well known
reaction of sugar solutions on caustic lime is made use of for separating the lime
from its combinations with magnesia for the purpose of producing magnesia or
hydrate of magnesia.
And having thus described and ascertained the nature of this Invention, and the
manner of carrying the same into effect, I declare that I do not claim as my

page_text: Invention the use of hydrate of magnesia or of magnesia for separating and
purifying beetroot and sugar juices, nor do I claim the manufacture of basic bricks
and linings from magnesia, but I claim as my Invention the manufacture of
magnesia or hydrate of magnesia from magnesiferous limestone, from magnesian
limestone, or from calciferous magnesite, using a water solution of sugar or molasses
in the manner herein described.
In witness whereof, I, the said Carl Scheibler, have hereunto set my hand and
seal, this Eighteenth day of July, in the year of our Lord One thousand
eight hundred and eighty one.
CARL SCHEIBLER. (L.S.)