Year: 1889

page_text: Date of Application, 22nd Oct., 1889-Accepted, 25th Jan., 1890
One (1) part Tungstate of Sodium.
Those skilled in the art to which this invention relates will understand that the
compound is chiefly a flux and detergent, and will determine by trial what quantity of
the mixture to use for any given charge.
In applying my invention I use this method for making what I call "Silicated
Copper,"
"Silicated Brass" or "Silicated Bronze."
On the hottom of the crucible, or on the bed of a reverberatory furnace I place from
one to ten per cent. of the said mixture according to character and weight of metal
charged; when all is molten I stir the bath thoroughly, allow it to remain quiet for a
few moments, skim off the scoria or dross, then proceed in the usual manner; or, I
place from one per cent. to ten per cent. of the mixture, carried in paper bags, into the
already molten metal, stir thoroughly, and then proceed as usual.
However, I would not confine myself to any fixed proportion of the parts in the
mixture, or to the use of any limited quantity of the mixture. Or to any one special
way of applying it to the metal. These must vary with different conditions.
What may be the influence of these several elements, separate or combined, what
chemical reactions may take place in the high temperature of crucible or furnace, are
problematic questions belonging to scientific theory, and have not yet been settled by
adequate investigation. But, as practical and important economical results I have
noted that this treatment with said compound flux or detergent makes the whole charge
more fusible, causes the adulterant material in the bath to rise quickly to the top,
while the cleansed metal subsides, dissolves and removes the oxides, and thus enables
the several metals to combine chemically and form a true alloy, which they cannot do
so long as any oxidized substance is present. It removes porosity, toughens, and
adds greatly to the tensile and resilient strength of copper, and of copper alloyed with
other metals. This special mixture and process for the treatment of copper and its
alloying metals is the result of study and experiment through many years.
aware that artificial Silicate, such as crushed glass, and that Fluor spar has been
used for certain purposes by copper and brass workers. But I do not know that
either the mixture of powdered pure native Silica and Fluor spar, or the compound of
Silica, Fluor spar, Carbonate of Potash and Tungstate of Sodium has ever been used
by any one else for said purpose, in metallurgy.
I am

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to he performed, I declare that what I
claim is,
1. The improvement in the process of cleaning, refining, and purifying copper and
its alloys, which consists in adding to the metal a mixture of Silica, Fluor spar,
Carbonate of Potash and Tungstate of Sodium, in about the proportions set forth,
commingling them by melting, skimming off the dross and then proceeding in the
usual manner, as set forth.
2. The mixture of Silica, Fluor spar, Carbonate of Potash and Tungstate of Sodium,
in substantially the proportions set forth, to be used to cleanse, refine and improve
copper and its alloys.
30
100A
ALLISON BROS.,
Agents for the Applicant.