A Process for the Production of Double Aluminium Sulphides (or Sulphurets) with Alkaline Metals, or Metals of (the nature of) Alkaline Earths.
Year: 1896

page_text: Date of Application (in United Kingdom), 21st Mar., 1896
Complete Specification Left, 21st Mar., 1896-Accepted, 20th June, 1896
COMPLETE SPECIFICATION.
A Process for the Production of Double Aluminium Sulphides (or
Sulphurets) with Alkaline Metals, or Metals of (the nature of)
Alkaline Earths.
I, DMITRY PÉNIAKOFF, of Rue Baudiun, Pierre Huy in the Kingdom of
Belgium, Chemist, 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 object of this invention is to facilitate the production of double aluminium
sulphides (or sulphurets) with other light metals, by the employment, as raw
material, of alkaline aluminates, or aluminates of alkaline earths.
The production of sulphide of aluminium by the direct treatment of alumina in
vapours of sulphuret of carbon cannot be carried on upon a scale sufficiently
large for manufacturing purposes, by reason of the excessively high temperature
required for the reaction.
According to Reichel, when sulphuret of carbon acts upon alumina, the following
reaction is the result

page_text: If therefore, a triple base aluminate be used in the reaction, instead of alumina,
the reaction, from being extremely endothermic (141), becomes exothermic, so
that it may be expressed thus, for example:-
(1855-141) - 44°5
that is to say, be converted into a heat-generating process.
My process is carried out in the following manner :-
The aluminate to be employed is preferably obtained by treating red bauxite
and alkaline sulphate, mixed with iron pyrites or alkaline sulphide.
According to the method of operation adopted in the performance of this process,
a more or less basic aluminate is obtained.
The aluminate thus produced on being mixed with tar or some other agglutinant
material, is thoroughly calcined, so that the material becomes more or less porous.
The mixture is broken up into small lumps or pieces and, in an air-tight space,
subjected to the action of vapours of sulphur, or oxy-sulphuret of carbon, or
sulphuret of carbon, until sulphurous acid or carbonic acid gas is set free.
According to the temperature adopted, and the amount of coal derived from the
tar, which has been added, either a baked or a melted product will be obtained.
In the former case, it may be converted into aluminium, in the form of metal, or
into alloys thereof, by a chemical process, i.e. by means of reducing gases, in the
latter case, the same conversion may take place by electrolysis.
Having now particularly described and ascertained the nature of the inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The process hereinabove described for producing, for manufacturing or com-
mercial purposes, double sulphides (or sulphurets) of aluminium and alkaline
metals, or metals of (the nature of) alkaline earths, by causing sulphuret of carbon,
or oxysulphuret of carbon, or sulphur vapours to act upon alkaline aluminates,
or aluminates of alkaline earths, with a view to obtaining aluminium in the form
of metal, or alloys thereof by means of either gases or electrolysis.
Dated this 19th day of March 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.