Improvements in Means or Apparatus for the Purification of Molten Tin or its Alloys.
Year: 1889

page_text: Date of Application, 23rd Mar.. 1889
Complete Specification Left, 21st Dec., 1889-Accepted, 25th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in Means or Apparatus for the Purification of Molten
Tin or its Alloys.
I DAVID OWEN of Brookfield House, Morriston near Swansea in the county of
Glamorgan, Tin Plate Manufacturer, do hereby declare the nature of this invention to
be as follows:
==
This invention relates to means or apparatus for separating more solid matters
from molten tin or its alloys, particularly in the manufacture of plates coated
therewith.
According to my present invention I employ a vessel containing the molten tin
or its alloys which is divided, the molten tin or its alloys being placed in one division
and having to pass through a reticulate surface constituting the whole or a part or
parts of the division wall whereby only the molten metal is permitted to pass and
scruff or other impurity is detained by the reticulate wall and the cleansed metal can
be drawn off or removed from the secondary division or divisions, or further purified
if requisite by being permitted to pass to another chamber or vessel through a passage
protected by reticulate work, and so on to other chambers if required.
A convenient form of apparatus consists of a chamber or chambers which may be
approximately square and of considerable area, containing a quantity of metal
introduced in ingot form or otherwise which is kept molten by a furnace or other heat
beneath, from this larger chamber is a communication with a tinning pot in which
the tinning or like operation may be carried on, the molten metal from the larger
chamber having to pass to the tinning pot through a wall or division consisting of
reticulate work.
Or the first chamber may be of any convenient size and shape and communicate
through a strainer with an intermediate chamber and thence through another strainer
to the tinning pot.
The reticulate work may consist of woven wire of fine mesh, or other suitable
straining material, the degree of filtration being regulated by multiplication of the
number of sheets of woven wire net, as well as by variation in the size of mesh.
The divisional divisions and straining means may be removable.
The molten metal in the tinning pot may from time to time as it becomes impreg-
nated with any impurities be returned to the larger vessel and be made again to pass
the filtering screen.
Dated the 02nd day of Mars 1850
COMPLETE SPECIFICATION.
Improvements in Means or Apparatus for the Purification of Molten
Tin or its Alloys.
I, DAVID OWEN of Brookfield House, Morriston near Swansea in the County of
Glamorgan, Tin Plate Manufacturer 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 means or apparatus for separating scruff or other
impurities or more solid matters from molten tin or its alloys, particularly in the
manufacture of plates coated therewith.

page_text: DESCRIPTION OF THE DRAWINGS.
Fig. 1 shows a longitudinal vertical section.
Fig. 2 shows a transverse vertical section taken at right angles to Fig. 1.
Fig. 3 shows a plan view!
Figs. 4, 5, 6, 7, 8, 9, 10 and. 11 show details illustrative of various filtering inedia 5
and modes of packing the same in the filtering chambers.
7
Figs. 12 and 13 show by side view and plan view a perforated retaining plate i.
Fig. 14 shows by vertical section a modification of the apparatus shown by
Figures 1, 2 and 3 taken on the line A, A of Fig. 15.
Fig. 15 shows a plan view of Fig. 14...
.ff i
Fig 16 is a detail showing a.modification in the form of the filtering media
consisting in a plate of iron or other suitable metal or suitable refractory materiali
(to be one of a packed series) having long slits therethrough, or it may, be a series
of punctures, which in practice are so arranged as to break sequence with each
other?
1
Fig. 17 shows a plan view of a modification of the previous arrangement, in that
the chamber is arranged in a line with the filtering chambers a, b, c, d, e, f, gti 10
Referring' to Figs. 1, 2 and 3, a is a pot or vessel having a longitudinal dividing
wall' a land other cross walls a
Jeep cross walls, a, a, a, a, a forming a series of chambers, b, c, d,
ef*gh.
r
6°
་ - t "f}
1
In theso chambers 6-inclusive I pack filtering media of one or more of the t
descriptions hereinafter referred to. In these Figures have shown the chamber, i
packed with thin metal plates arranged at I vertically, side by side, and transversely
of the greater length of the pot, at 2 other plates are arranged. vertically, longi-
tudinally of the pot, at 3 again in the same direction as at 1. is a plate, having
perforations through which the molten metal introduced to the upper part of tho
chamber percolates; and, thence, through the filtering plates at 1, 2 and 3. is ad
handle for removing the plate. The chambers c, d and e are shown packed with;
plates substantially in the same manner as the chamber. The chamber is supposed.,
to be packed with woven wire plates is another chamber which may be packed,,30
with filtering media, or not. is the dipping chamber. is a cross bar for
keeping down the plates in the chamber which bar is secured to the side walls
thereof by the screw studs These cross bars of their equivalent may, be multiplied,,
or not as found convenient.
bar
19.7, i
Fig 4 shows the upper part of a chamber with such a cross bark, and screw,35
studs in position. In this illustration, as also in
filtering media are packed horizonially ältetäátélf with to: 5. the plates forming then
in the same plane as the greater length of the pot, but in this case it is convenient
other plates, packed vertically
to form the dividing walls with perforations.com
od asitizungu,
ten
Fig. 6 shows the filtering media composed of shot 5
viar la fused of shot 5 which may be divided by-woven 14
40
plates.6.
Fig. 7 shows the filtering media composed of rods of iron or other metal or
suitable refractory material in groups crossed at right angles to each other. Fig. 8
shows one of the plates in plan, and edge view, Fig9 one of the rods in plan and
end view, Fig. 10 one of the shot, and Fig. 11 a small piece of the woven wire. 45
Or the filtering media may, be made up of modifications, or combinations of the
arrangements of any of the preceding forms of media.
The tin from the chamber bypasses by the opening in the direction of the arrow
up c to the openings c¹, thence into d, and by the opening d¹ into e, by the opening e¹
into by the opening into g, by the opening into 'h; which will then contain 50
the clarified tin. 1o a lot od ultima
In Figs. 14 and 15, only four chambers are shown although the number may be
multiplied or varied. The molten .tin is poured in atropasses throughi the filter at 60
into the chamber c, thence by the filter, & into the chamber d, thence by the chamber d
into the chamber, which may be the tiuning
24 Pot bil or to citizym 55
Atif Petite to steb
41

page_text: The filtering media is shown as being removeable by being drawn out bodily.
In Fig. 17 the only difference from Fig. 1. is in the arrangement of the chambers
in one line.
According to my present invention I employ a vessel containing the molten tin or
its alloys which is divided, the molten tin or its alloys being placed in one division
as b, and being caused to pass through a reticulate surface or filtering mass con-
stituting the whole or a part or parts of the separating media or division wall or walls
whereby only the molten metal is permitted to pass and scruff or other impurity is
detained by the reticulate intervening mass or wall and the cleansed metal can be
drawn off or removed from the secondary division or divisions, or further purified if
requisite by being permitted to pass to another chamber or vessel through a passage
protected by reticulate work, and so on to other chambers if required.
A convenient form of apparatus shewn by Figs. 1, 2, 3 consists of a chamber or
chambers which may be approximately oblong or square and of considerable area,
containing a quantity of metal introduced in ingot form or otherwise as 6 which is in
usual manner kept molten by a furnace or other heat, not shown, beneath, and from
this larger chamber is a communication through soparating media with a tinning
pot ash in which the tinning or like operation may be carried on, the molten metal
from the chamber as having to pass to the tinning pot h through a wall or
division or walls or divisions and masses of filtering media consisting of reticulate
work or masses of plates, wires, shot, or woven wirework. Or the first chamber
may be of any convenient size and shape and communicate through a strainer with
an intermediate chamber or intermediate chambers and thence through another
strainer to the tinning pot as shown by Figs. 14 and 15.
The reticulate work may consist of woven wire of fine mesh, wire gauze, or fibre
or other suitable straining material or of assembled plates, sheets, wires of any
suitable section, bricks, cubes, balls, or like bodies of iron or other suitable metal,
asbestos, or other suitable and refractory materials capable when assembled or
arranged as set forth of giving sufficiently fine filtering passages; the desired
degree of filtration being regulated by multiplication regulation and arrangement of
the number of sheets, plates or thicknesses of woven wire net or metal surfaces as well
as by variation in the size of mesh or spacing.
The divisional partitions and straining means may be removeable.
The molten metal in the tinning pot may from time to time as it becomes
impregnated with any impurities be returned to the larger vessel and be made again
to pass the filtering screen.
I am aware that it has been proposed to filter molten tin through a mass of
scruff from a previous melting contained in a vessel protected above by bars and
then passing through interstices formed by an assemblage of vertical wires packed in
orifices from said vessel but I make no claim to such arrangement.
Having now particularly described and ascertained the nature of my said inven-
ion and in what manner the same is to be performed, I declare that what
I claim is
In apparatus for the purification of tin or its alloys a vessel having divisions from
ne to the other of which the molten metal is caused to pass through reticulate or
iltering masses formed of assemblages of plates, wire, shot, or woven wirework, fibre,
r other forms, of iron or other metal or suitable refractory material, as set
orth.
BALCH
the 21st day of December 1009.
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicant.