Process for Extracting Aluminium from Substances Bearing Alumina and Combining the Aluminium with other Metals Directly from such Substances.
Year: 1888

page_text: Process for Extracting Aluminium from Substances Bearing Alumina
and Combining the Aluminium with other Metals Directly from
such Substances.
I WILLIAM AUGUSTUS BALDWIN residing at 195 La Salle Street, Chicago, State
of Illinois one of the United States of America, Metallurgist do hereby declare the
nature of this Invention and in what manner the same is to be performed to be
particularly described and ascertained, in and by the following statement :-
The Invention relates to a process for extracting Aluminium from substances
bearing alumina and combining it with other metals directly from such substances.
In carrying out my process, I first take preferably of dry pulverized clay one
part, of pulverized charcoal, one fourth part, and of sodium chloride three parts by
weight, and bring the mixture to a state of fusion in a crucible or melting pot.
The proportions of charcoal and sodium chloride herein above given may be varied
somewhat but I have found that the proportions mentioned give good results.
I pour into the fused mixture referred to a molten metal such as iron, or steel, or
copper, or other metal that I desire to combine with Aluminium, and allow it to
remain until the combination is effected.
One half hour or more is required for this purpose according to the amount of
aluminium desired to be combined with the metal and the amount of the charge.
During this time the contents of the crucible must be kept in a state of fusion
and sometimes I find it desirable to stir the charge.
Finally I discharge the combined metals into suitable moulds to form pigs or
bars.
It is obvious that the clay, charcoal and sodium chloride and the metal desired to
be combined with the aluminium may all be fused in the same crucible, at the same
time with like results, but metals which melt at low temperatures such as zinc and
tin should not be introduced until the contents of the crucible are fused.
It is also obvious that coal, coke, or other substance carrying carbon may be used
instead of charcoal, but I have found that the latter gives the best results.
The process I have described above refers to the combination of aluminium with
other metals directly from clay but there are substances that contain more alumina
than clay, such as beauxite and corundum, and such substances may be used in the
same manner as clay by increasing the proportions of coal of sodium chloride.

page_text: For convenience and brevity I call the process set forth, the process of aluminizing
metals.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is :
First. The process of aluminizing metals directly from clay or from like earth's
bearing alumina, which consist in fusing metals with sodium chloride, carbonaceous
matter and clay or like earths bearing alumina as specified.
Second. The process of aluminizing metals directly from clay or like earths bearing
alumina, which consists first, in fusing clay or like earths with carbonaceous matter
and sodium chloride in a melting receptacle, second in fusing the metal to bo
aluminized in a separate receptacle, and finally in pouring such melted metal into the
fused mass of carbonaceous matter, clay and the like and sodium chloride, the latter
being in quantity in excess of either of the other ingredients employed as specified.
Dated this 21st day of February 1888.
WILLIAM AUGUSTUS BALDWIN.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.
WILLIAM AUGUSTUS BALDWIN.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.