IMPROVEMENTS IN APPARATUS FOR FACILITATING THE DISSOLUTION OF OXIDE OF LEAD AND OTHER SUBSTANCES USED FOR MAKING LEAD SALTS FOR THE MANUFACTURE OF WHITE LEAD AND OTHER COMPOUNDS OF LEAD
Year: 1885

page_text: I, ALEXANDER WILLIAM ANDERSON, of Ossory Road, Old Kent Road, in the
County of Surrey, Colour Manufacturer, do hereby declare the nature of my said
invention for "IMPROVEMENTS IN APPARATUS FOR FACILITATING THE DISSOLUTION
OF OXIDE OF LEAD AND OTHER SUBSTANCES USED FOR MAKING LEAD SALTS FOR
THE MANUFACTURE OF WHITE LEAD AND OTHER COMPOUNDS OF LEAD," to be as
follows:-
My invention relates to apparatus for facilitating the dissolution more especially
of oxide of lead, such as litharge for example, by the action of acetic or other
suitable solvent acid or chemical, in the manufacture of white lead by the process
of precipitation by carbonic acid gas, but it is also applicable to the dissolution of
other substances used for making lead salts for the manufacture of white lead and
other compounds of lead, such as sulphate of lead for example.
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For these purposes, I employ a hollow cylindrical drum, closed at both ends, and
made of wood, or other suitable material which is not acted upon by the solvent
solution employed. This hollow drum is laid horizontally, and is furnished with a
shaft or axis passing through a stuffing box at the centre of one or both ends.
this shaft or axis are mounted a series of stirrers or paddles, the outer ends of
which are made to approach as closely as possible to the inner circumferential
surface of the drum. Rotary motion is imparted to these stirrers or paddles by
means of pullies, toothed gearing, or other suitable mechanical appliances connected
to the shaft or axis. The hollow drum is filled up more or less completely with
the solvent solution, and the litharge or other oxide of lead or other substance it is
desired to dissolve, and the stirrers or paddles are set in motion at a suitable speed.
The result is that the litharge or other substance is thereby agitated and brought
into intimate contact with the whole of the solvent solution in the hollow drum
and is rapidly dissolved thereby. When the complete dissolution of the oxide or

page_text: other substance is effected, the solution charged therewith is drawn off through a
suitable outlet at the bottom of the hollow drum, and a fresh charge of solution
and oxide, or other substance, is placed therein.
I prefer that the hollow drum shall remain stationary while the stirrers or
paddles revolve therein, but if preferred, the drum made be made to rotate slowly
at the same time as the stirrers or paddles.
By the employment of the above described arrangements, the stirrers or paddles
are enabled to sweep through the whole contents of the drums, so as to effect a
complete admixture of all parts of the contents, the shape and position of the drum
tending to facilitate the attainment of that object.

page_text: Improvements in Apparatus for Facilitating the Dissolution of
Oxide of Lead and other Substances Used for Making Lead
Salts for the Manufacture of White Lead and other Com-
pounds of Lead.
I, ALEXANDER WILLIAM ANDERSON, of Ossory Road, Old Kent Road, in the
County of Surrey, Colour manufacturer, do hereby declare the nature of my
invention for "" IMPROVEMENTS IN APPARATUS FOR FACILITATING THE DISSOLUTION
OF OXIDE OF LEAD AND OTHER SUBSTANCES USED FOR MAKING LEAD SALTS FOR
THE MANUFACTURE OF WHITE LEAD AND OTHER COMPOUNDS OF LEAD
and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the accompanying sheet
of drawings and to the letters and figures marked thereon :-
"
My invention relates to apparatus for facilitating the dissolution more especially
of oxide of lead, such as litharge for example, by the action of acetic, or other
suitable solvent acid or chemical, in the manufacture of white lead by the process
of precipitation by carbonic acid gas, but it is also applicable to the dissolution of
other substances used for making lead salts for the manufacture of white lead, and
other compounds of lead, such as sulphate of lead for example.
In the drawings hereto annexed, Figure 1 is a transverse, and Figure 2 &
longitudinal section of an apparatus constructed in accordance with my invention.
A is a hollow cylindrical drum closed at both ends, and made of wood or other
suitable material which is not acted upon by the solvent solution employed. This
hollow drum is laid horizontally in cast iron chairs, as shown, or is otherwise
supported, and is furnished with a revolving shaft or axis B, the main portion of
which may preferably be composed of wood fitted with gun metal, copper or other
suitable metallic ends B¹ B¹ which pass through stuffing boxes C C fixed at the
centre of the ends of the hollow drum. If preferred, the end of the shaft or axis,
opposite to that at which the driving pullies are placed, may revolve in a bearing
fixed on the inside of the end of the drum, instead of passing through a stuffing box,
as shown. On the shaft or axis B, are mounted a series of stirrers or paddles D D,
the outer ends of which are made to approach as closely as possible to the inner
circumferential surface of the drum. Rotary motion is imparted to the shaft or
axis B, and the stirrers or paddles D D, by means of a pulley E, toothed gearing,
or other suitable mechanical appliances connected to the shaft or axis. The hollow
drum A is filled up more or less completely with the solvent solution and the
litharge or other oxide of lead, or other substance it is desired to dissolve, through
the manhole F, and the stirrers or paddles D are set in motion at a suitable speed.
The result is that the the litharge or other substance is thereby agitated and
brought into intimate contact with the whole of the solvent solution in the hollow
drum and is rapidly dissolved thereby. When the complete dissolution of the
oxide or other substance is effected, the solution charged therewith is drawn off
through a suitable valve or outlet G at the bottom of the hollow drum, and a fresh

page_text: charge of solution and oxide, or other substance, is placed therein through the
manhole F, or through other suitable opening.
I prefer that the hollow drum shall remain stationary while the stirrers or
paddles revolve therein, but if preferred, the drum may be made to rotate slowly
at the same time as the stirrers or paddles, and in the same or in opposite
directions; and for this purpose, the said drum may be arranged to rotate on
bearing rollers, or on trunnions, supported in suitable bearings.
By the employment of the above described arrangements, the stirrers or paddles
are enabled to sweep through the whole contents of the drum so as to effect a
complete admixture of all parts of the said contents, the cylindrical shape and
horizontal position of the drum tending to facilitate the attainment of that object.
I am aware that attempts have been made to dissolve metallic lead and oxide
of lead in cylindrical drums placed horizontally and made to revolve on their
horizontal axes, such revolving drums being provided with internal shelves secured
to their internal peripheries, or to an internal axis for the purpose of raising up
the lead, or lead oxide, out of the solvent liquid, and then allowing it to fall back
thereinto, but I have ascertained by practical experience that apparatus constructed
in that way is not suitable for the purpose, and I wish it to be understood that
I make no claim in this specification to apparatus of that kind,
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
In the manufacture of white lead and other compounds of lead, the improved
apparatus for facilitating the dissolution of oxide of lead and other substances used
for making lead salts, consisting of a horizontal cylindrical stationary or revolving
drum provided with an internal revolving shaft or axis fitted with stirrers or
paddles, the whole combined, arranged, and operating as herein-before described,
and illustrated in the drawings hereto annexed.