Improved Process for the Manufacture of Litharge, Red Lead, and Cement from Galena or other Lead Ores; or from Sulphate: - of Lead.
Year: 1892

page_text: Date of Application, 21st Dec., 1892
Complete Specification Left, 20th Sept., 1893-Accepted. 16th Dec.. 1893
PROVISIONAL SPECIFICATION.
Improved Process for the Manufacture of Litharge, Red Lead, and
Cement from Galena or other Lead Ores; or from Sulphate:
- of Lead.
I, WILLIAM STIRLING KILPATRICK 21 Hopehill Road, Glasgow, Chemist, do
hereby declare the nature of this invention to be as follows:-
By this invention galena or other lead ores are either roasted or sublimed so as
to form a mixture of lead oxide and, sulphate.
The mixture thus obtained; or the sulphate of lead; is then mixed with the
necessary proportion of oxide or carbonate, of the alkalies, of the alkaline earths
or of any other metal. This is then calcined in a reverberatory furnace till the
mass consists of oxide of lead, and sulphate of the metal added.
The sulphate may then be separated by grinding and washing, if litharge is
required, or allowed to remain for cement.
The litharge thus obtained is ready for the market, or for converting into
red lead, in a colouring furnace by the action of heat and atmospheric air or
oxygen gas.
Oxygen gas may also be used in the roasting of the ore and in subliming, or
in the combustion chamber after subliming. Or in passing into or over molten
metallic lead to form oxide or in any part of the process where it may be found
useful.
Dated this Twentieth day of December 1892.
WM. S. KILPATRICK,
21, Hopehill Road, Glasgow.
COMPLETE SPECIFICATION.
Improved Process for the Manufacture of Litharge, Red Lead, and
Cement from Galena or other Lead Ores, or from Sulphate
of Lead.
I, WILLIAM STIRLING KILPATRICK of 21 Hopehill Road, in the City of
Glasgow, 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 :-
This invention relates to an improved process for the manufacture of litharge
red lead and cement from galena or other lead ores or from sulphate of lead and
under the invention the galena or other lead ores containing sulphide or sulphate
of lead are roasted in a reverberatory furnace so as to form a mixture of or a mass
consisting of oxide and sulphate of lead.
The roasted mass or mixture thus obtained or the sulphate of lead or lead fume
is then mixed with the theoretical quantity or proportion of an oxide or carbonate
of an alkali metal or the metal of an alkaline earth or of any other suitable metal
such as magnesium or zinc.
The mixture is then heated in a reverberatory furnace till the mass consists of
oxide of lead and sulphate of the metal added.
After cooling, the roasted mass is ground, washed and livigated.
The litharge thus obtained is ready for the market or for converting into red
lead in a colouring furnace by the action of heat and atmospheric air in the
usual way.

page_text: In order to make cement the mass consisting principally of oxide of lead and
sulphate of the metal added is ground to powder, and is then ready for the
market.
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 improved process for the manufacture of litharge and red lead, substantially
as herein before described.
2. The improved process for the manufacture of cement, substantially as herein-
before described.
Dated this 19th day of September 1893.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.