Improvements in or relating to the Precipitation of Gold from Chloride or Bromide Solutions Containing it.
Year: 1899

page_text: Date of Application, 7th Mar., 1899.
Complete Specification Left, 28th Aug., 1899-Accepted, 30th Sept., 1899:
Improvements in or relating to the Precipitation of Gold from
Chloride or Bromide Solutions Containing it.
We, FREDERICK WILLIAM MARTINO, of 107, Montgomery Road, Sharrow,
Sheffield, in the County of York, Manufacturer, and FREDERIC STUBBS, of "Edge-
gate," Osborne Road, Sheffield, in the County of York, Engineer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to improvements in the precipitation of gold from
chloride or bromide solutions containing it, the solutions referred to being such
as are produced in the well-known chlorination process and the less: known
permanganate" and ""bromide" processes.
"
The essential feature of this invention is the employment, for precipitating
gold from the above mentioned solutions, of metallic carbides, which, when
brought into contact with water, produce a hydrocarbon gas; or the employment
of such hydrocarbon gases however they may be manufactured.
Carbides of the metals of the alkaline earths-calcium and barium carbides,
for instance-produce acetylene when treated with water; and methane is pro-
duced in a similar manner, from aluminium carbide.
"
In the following specification the terms metallic carbide" and "hydrocarbon
are to be understood as referring respectively to the carbides and gases
above mentioned.
gas
In carrying out this invention, a hydrocarbon gas or a mixture of such gas
and oxygen, is passed through a chloride or bromide solution containing gold;
or a metallic carbide is added to the liquid, thus producing a nascent hydro-
carbon gas; in either case the chloride or bromide of gold is decomposed and the
metal precipitated.
If the chloride or bromide solution contains free chlorine or free bromine, it
may be found advisable, before treating the solution by the method herein
described, to remove the excess of chlorine or bromine by any convenient process,
preferably by passing a current of air through the solution, in order to avoid the
waste of metallic carbide or hydrocarbon gas which is necessary to neutralize these
elements before precipitation commences.
In the permanganate process the small quantity of permanganate present in
the solution of auric chloride is immediately decomposed by the metallic carbide
or hydrocarbon gas and precipitation of gold then proceeds rapidly.
Heat from any outside source may, if desired, be applied during any of the
stages constituting this improved process.
Doted thin th
1000

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to the Precipitation of Gold from
"
Chloride or Bromide Solutions Containing it.
We, FREDERICK WILLIAM MARTINO, of 107, Montgomery Road, Sharrow,
Sheffield, in the County of York, Manufacturer, and FREDERIC STUBBS, of "Edge-
gate," Osborne Road, Sheffield, in the County of York, 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:
This invention relates to improvements in the precipitation of gold from
chloride or bromide solutions containing it, the solutions referred to being such
as are produced in the well-known "chlorination" process and the less known
permanganate" and "bromido" processes.
66
The essential feature of this invention is the employment, for precipitating
gold from the above mentioned solutions, of metallic carbides, which, when,
brought into contact with water, produce a hydrocarbon gas; or the employment
of such hydrocarbon gases however they may be manufactured.
Carbides of the metals of the alkaline earths-calcium and barium carbides,
for instance-produce acetylene when treated with water; and methane is pro-
duced in a similar manner, from aluminium carbide.
"3
In the following specification the terms "metallic carbide" and "hydrocarbon.
gas are to be understood as referring respectively to the carbides and gases
above mentioned.
In carrying out this invention, a hydrocarbon gas is passed through a chloride
or bromide solution containing gold; or a metallic carbide is added to the liquid,
thus producing a nascent hydrocarbon gas; in either case the chloride or bromide
of gold is decomposed and the metal precipitated.
If the chloride or bromide solution contains free chlorine or free bromine, it
may be found advisable, before treating the solution by the method herein
described, to remove the excess of chlorine or bromine by any convenient process,
preferably by passing a current of air through the solution, in order to avoid the
waste of metallic carbide or hydrocarbon gas which is necessary to neutralise these
elements before precipitation commences.
In the permanganate process the small quantity of permanganate present in
the solution of auric chloride is immediately decomposed by the metallic carbide
or hydrocarbon gas and precipitation of gold then proceeds rapidly.
Heat from any outside source may, if desired, be applied during any of the
stages constituting this improved process; for instance the chloride or bromide
solution may be heated before or during treatment, by passing steam through
pipes immersed in it, or the vessels containing the solution may be steam
jacketed.
.
· Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:―
1. In the precipitation of gold from chloride or bromide, solutions the employ-
ment of a metallic carbide of the kind described.
2. In the precipitation of gold from chloride or bromide solutions, the employ-
ment of a hydrocarbon gas of the kind described.
Dated this Orth dow of Aroust 1800
FREDERICK WILLIAM MARTINO.
FREDERIC STUBBS.
Boult & Wade,
Agents for the Applicants.