Improvements in Indestructible Refractory Compositions.
Year: 1899

page_text: Date of Application, 17th Mar., 1899-Accepted, 6th Jan., 1900
COMPLETE SPECIFICATION.
Improvements in Indestructible Refractory Compositions.
I, ALEXANDRE PARRETTI, of 26, Cours Belzunce, Marseille, in the Republic of
France, Civil Engineer, 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 daily springing up of new industries and new discoveries has led to a great
demand for highly refractory substances whether for building furnaces in which
aluminium, calcium carbide and the like may be manufactured, or for manufacturing
crucibles in which the fusion of platinum and the like may be safely carried on.
have undertaken experiments with a view to producing an indestructible refractory
composition or paste and after many efforts I have succeeded in producing a paste
which is at once infusible, insoluble and indestructible and which is capable of
withstanding the very high temperatures required for the manufacture of fire bricks,
furnaces, crucibles and the like.
This composition or paste consists of highly refractory substances, chief amongst
them being that known as mica. This ore, which is very abundant in Europe, is
infusible and insoluble, being moreover a good insulator, while its cost price is low on
account of its abundance. The chemical properties of this substance although well
known to chemists have not yet been utilized to their full extent.
As above stated, I have been led to discover the mode of utilizing this ore by using
it in connection with other substances foreign to its origin, and hence I mix it with
porphyrized asbestos which is also an infusible substance, and I add to this mixture
graphite, tale, and silicate of magnesia.
This paste is prepared specially for the construction of fire bricks, furnaces, and
crucibles having to withstand a very high temperature; the mica, asbestos, graphite
tale and silicate of magnesia are mixed together in variable proportions according to
the usual practice obtaining in brick, pottery or other similar works. These variable
proportions are rendered necessary on account of the use to which such bricks are to
be put; as bricks used in the construction of calcium carbide, aluminium or platinum
furnaces will require to withstand a much higher temperature than those intended for
ordinary furnaces requiring only an average high temperature, and hence will be used
a somewhat different composition.
The following are the proportions 1 generally prefer to employ :-

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1). The process whereby a refractory and indestructible composition or paste is
prepared by mixing together mica and asbtestos with other refractory earths for the
manufacture of bricks for the building of furnaces, crucibles and other like purposes,
substantially as herein described.
2). A composition or paste substantially as and for the purposes herein set forth.
2). A composition or paste substantially as and for the purposes herein set forth.
JOHN P. O'DONNELL, Fel. Chart. Inst. P.A.,
Agent for said Applicant, 70 and 71, Palace Chambers, Westminster, S.W.