Process for the Extraction of Tin from Tin Slags or Tin Refuse by Founders' Ashes, Copper Salts, Carbonaceous Matter, and Fluor Spar or other suitable Fluxes.
Year: 1891

page_text: Date of Application, 27th June, 1891
Complete Specification Left, 25th Mar., 1892-Accepted, 14th May, 1892
PROVISIONAL SPECIFICATION.
A Process for the Extraction of Tin from Tin Slags or Tin Refuse by
Founders' Ashes, Copper Salts, Carbonaceous Matter, and Fluor
Spar or other suitable Fluxes.
I FRANCIS HERBERT MASON of Number 128 Gower Street in the Parish of
Saint Pancras in the County of Middlesex Metallurgist do hereby declare the
nature of this invention to be as follows:-
The tin slag or tin refuse is smelted in a furnace with copper oxide founders
ashes copper refuse or other suitable cuperous or cuperic salts carbon or carbonaceous
matter fluor spar lime or other suitable fluxes varying with the nature of the tin
slags or tin refuse. The result is an alloy of copper and tin (known as bronze)
with iron and other impurities (i.e. substances other than copper and bronze)
varying with the nature of the tin slag or tin refuse and the temperature at which
it is smelted.
This alloy is subjected to poling which gets rid of the impurities and leaves a
bronze which by the addition of copper tin or zinc can be made into a marketable
tin alloy.
Dated this 26th der of June 1891
FRANC. H. MASON.
COMPLETE SPECIFICATION.
A Process for the Extraction of Tin from Tin Slags or Tin Refuse by
Founders' Ashes, Copper Salts, Carbonaceous Matter, and Fluor
Spar or other suitable Fluxes.
I FRANCIS HERBERT MASON of No. 25 Margaretta Terrace Oakley Strect
Chelsea in the County of Middlesex 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 :-
I take tin slag or tin refuse and crush it so that the larger pieces do not exceed
the size of a walnut. I then thoroughly mix it with (1) founders ashes copper
oxide or other easily reducible copper salts in such proportion that the amount of
the copper in such founders ashes copper oxide or copper salts is about three times
the amount of tin contained in the quantity of tin slag or tin refuse treated.
(2) Anthracite or other carbonaceous matter in such a quantity as when the mass
is heated will reduce the whole of the tin contained in the slag or refuse and the
copper contained in the founder's ashes copper oxide or copper salts so added as
aforesaid to the metallic state and (3) fluor spar lime or other suitable fluxes, the
quantity and nature of such fluxes varying with the nature of the slag to be treated.
Inexi smelt the mass so mixed as above in a low blast or reverbatory furnace.
In the event of using a reverbatory furnace the heat is raised until the mass melts;
the mass is rabbled from time to time, and the heat kept up until bubbling ceases,
a little anthracite is then thrown on the top of the mass in the furnace and after
about half an hour the metal is tapped or run out, the metal which runs away
alloy of tin and copper and sometimes contains a little iron.
is an
If necessary this alloy may be subjected to poling to purifiy it from any iron it
may contain and to this alloy copper tin or zinc may be added to make it into a tin
alloy of any required standard.

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:
The reduction of tin from tin slags by fusion in a furnace crucible or by other
means with founders ashes copper oxide or other easily reducible salts of copper,
anthracite or other carbonaceous matter and suitable fluxes varying with the nature
of the slag, the result is an alloy of tin and copper, known as bronze and may
either go into the market as such or may be separated by one of the methods
already known.
Dated this 24th day of March 1905
FRANC. H. MASON.