IMPROVEMENTS IN CRUCIBLES AND REFRACTORY VESSELS USED IN THE RED
Year: 1880

page_text: 46
LETTERS PATENT to Adolf Landsberg, of Stoberg, near Aachen, in the
Kingdom of Prussia, Engineer, for an Invention of IMPROVEMENTS IN
CRUCIBLES AND REFRACTORY VESSELS USED IN THE REDUCTION
AND
PROVISIONAL SPECIFICATION left by the said Adolf Landsberg at the
Office of the Commissioners of Patents on the 31st December 1880.
ADOLF LANDSBERG, of Stoberg, near Aachen, in the Kingdom of Prussia,
Engineer. "IMPROVEMENTS IN CRUCIBLES AND REFRACTORY VESSELS USED IN
THE REDUCTION AND DISTILLATION OF ZINC, AND IN MELTING OTHER METALS
AND ALLOYS."
This Invention has for its object improvements in crucibles and refractory
vessels used in the reduction and distillation of zinc, and in melting other metals
and alloys.
For the reduction of zinc ores and the distillation of the reduced zinc in the
zinc smelting furnaces, for the distillation of zinc, whether the other metals
contained in the alloys of zinc are recovered or not, and for melting metals and
alloys of metals, as copper brass or yellow brass, there are employed generally retorts
or crucibles of fire clay or of a mixture of graphite and fire clay. These crucibles
when made of fire clay do not resist for any length of time the corrosive action of
the materials therein treated, and when made of graphite they are speedily
destroyed by the action of the fire.
I manufacture for use in the above named and like operations crucibles that
resist the action of the fire and of the matters treated therein for a longer time than
those composed of fire clay, or than those composed of graphite mixed with fire
clay, that is to say, I employ crucibles formed with an exterior layer of fire clay
and an interior one of graphite mixed with fire clay.
It is sufficient however instead of forming the inner layer of a mixture of
graphite and fire clay to make the crucible simply of fire clay, and to cover with a
mixture of graphite and fire clay the inner parts of it on those places that are
specially liable to be corroded by the contact of the materials treated in them.
Charcoal, coke, or coal may be substituted either in part or wholly for the
graphite.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Adolf Landsberg in the Great Seal Patent Office on the 29th June
1881.
ADOLF LANDSBERG, of Stoberg, near Aachen, in the Kingdom of Prussia,
Engineer. " IMPROVEMENTS IN CRUCIBLES AND REFRACTORY VESSELS USED IN
THE REDUCTION AND DISTILLATION OF ZINC, AND IN MELTING OTHER METALS
AND ALLOYS."
This Invention has for its object improvements in crucibles and refractory
vessels used in the reduction and distillation of zinc, and in melting other metals
and alloys.
For the reduction of zinc-ores and the distillation of the reduced zinc in the zinc
smelting furnaces, for the distillation of zinc, whether the other metals contained
in the alloys of zinc are recovered or not, and for melting metals and alloys of
metals, as copper brass or yellow brass, there are employed generally retorts or
crucibles of fire clay or of a mixture of graphite and fire clay. These crucibles
when made of fire clay do not resist for any length of time the corrosive action of
the materials therein treated, and when made of graphite they are speedily
destroyed by the action of the fire.
I manufacture for use in the above named and like operations crucibles that
resist the action of the fire and of the matters treated therein for a longer time
than those composed of fire clay, or than those composed of graphite mixed with
fire clay, that is to say, I employ crucibles formed with an exterior layer of fire clay
and interior one of graphite mixed with fire clay.
It is sufficient however instead of forming the inner layer of a mixture of
graphite and fire clay to make the crucible simply of fire clay and to cover with a
mixture of graphite and fire clay the inner parts of it on those places that are
specially liable to be corroded by the contact of the materials treated in them.
Charcoal, coke, or coal may be substituted either in part or wholly for the
graphite.
What I claim is, the manufacture and use, as described, of crucibles and
refractory vessels composed of an exterior layer of fire clay and an inner layer of
graphite and fire clay, or of charcoal, coke, or coal and fireclay, whether with or
without graphite.
In witness whereof, I, the said Adolf Landsberg, have hereunto set my hand
and seal, this Twenty third day of June, in the year of our Lord One
thousand eight hundred and eighty one.
ADOLF LANDSBERG. (L.S.)