IMPROVEMENTS IN THE MANU- FACTURE OF WHITE LEAD AND IN THE GRANULATION OF METALLIC LEAD 333 MRR TRAKDAMEAU
Year: 1882

page_text: LETTERS PATENT to William Virgo Wilson, Colour Manufacturer Jubilee
Street Mile End London for an Invention of IMPROVEMENTS IN THE MANU-
FACTURE OF WHITE LEAD AND IN THE GRANULATION OF METALLIC LEAD
333
MRR
TRAKDAMEAU
AS
PROVISIONAL SPECIFICATION left by the said William Virgo Wilson at the
Office of the Commissioners of Patents on the 8th September 1882.
WILLIAM VIRGO WILSON Colour Manufacturer Jubilee Street Mile End London
IMPROVEMENTS IN THE MANUFACTURE OF WHITE LEAD AND IN THE GRANULATION
OF METALLIC LEAD FOR THE PRODUCTION OF THE SAME
This Invention has for its object the improvement of the body or covering
property of White Lead especially that which has been prepared by the precipitation
of Oxide of Lead from its Salts, by means of Carbonic Acid Gas
I treat the White Lead by preference in the wet state with Caustic Potash Soda
or Ammonia the causticised Alkaline earthis may also be used, but on account of
their forming insoluble precipitates I do not advise their employment generally
In practice I find about seven per cent of Caustic Soda to the White Lead
(calculated as being in the dry state) or its equivalent in the other reagents
specified to yield very good results but I do not confine myself to these
proportions
This treatment may be effected either by passing the solution of one or more of
the bodies above mentioned through the filter press in which the White Lead is
sometimes collected or in a closed or open vessel in which the White Lead has been
deposited, with or without the application of heat
For the purpose of preparing the Metallic Lead for its solution in Acetic Acid
Acetate of Lead or other Lead Salts, I blow it from a convenient orifice, made in
the lower part of the vessel in which it has been melted by a current of heated
steam or atmospheric air by which a very complete granulation can be effected
The Metal so treated may be conveniently received in a vessel through which
water may be allowed to flow

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Virgo Wilson in the Great Seal Patent Office on the
7th March 1883,
WILLIAM VIRGO WILSON of Jubilee Street Mile End in the County of
Middlesex Colour Manufacturer IMPROVEMENTS IN THE MANUFACTURE OF
WHITE LEAD AND IN THE GRANULATION OF METALLIC LEAD FOR THE PRO-
DUCTION OF THE SAME
This invention has for its object the improvement of the body or covering
property of White Lead especially that which has been prepared by the pre-
cipitation of oxide of Lead from its salts by means of Carbonic Acid Gas
I treat precipitated White Lead, by preference in the wet state, with Caustic
Potash, Soda or Ammonia, the causticized Alkaline earths may also be used but on
account of their forming insoluble precipitates I do not advise their employment
generally
In practice I find about seven per cent of Caustic Soda to the White Lead, the
latter calculated as being in the dry state or the equivalent of the Caustic Soda, in
the other reagents specified, to yield very good results but I do not confine myself to
these proportions-This treatment may be effected either by passing the solution of
one or more of the bodies above mentioned through the filter press in which the pre-
cipitated White Lead is sometimes collected or into a closed or open vessel in which the
White Lead has been deposited either with or without the application of heat-For
the purpose of preparing the Metallic Lead for its solution I blow it from a
convenient orific emade in the lower part of the Vessel in which the metal has been
melted, by a current of heated steam or atmospheric Air by which a very complete
granulation can be effected-The Metal so treated may be conveniently received in
a vessel through which water is allowed to flow
Having thus described the nature of my invention and the method of carrying
out the same, 1 would have it understood that what I claim is the treatment of
White Lead and Metallic Lead in the manner above described
In witness whereof I the said William Virgo Wilson have hereunto set my
hand and seal this fifth day of March in the year of our Lord One thousand
eight hundred and eighty three.
WILLIAM VIRGO WILSON (L.S.)