Year: 1886

page_text: Date of Application, 9th Oct., 1886.
Complete Left, 13th Dec., 1886.
Complete Accepted, 14th Jan., 1887.
I, JOHN WARWICK, of No. 108 Rye Hill, in the City and County of Newcastle-
upon-Tyne, Lead Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention applies especially to the fumes containing lead which arise from
reverberatory furnaces and has for its object the recovery of the contained lead in
apparatus of a simple construction. The method usually employed at present for the
recovery of lead contained in considerably diluted fume, is to pass the fume through a
great length of flue of considerable size, where by its slow passage the suspended
particles of metalic matter may settle out, there is however always a great expense
and often a great difficulty in constructing such flues of adequate size and length in a
lead works.
There are other methods of collection of such suspended particles, such as washing
the fume in scrubbing towers, which however are troublesome and expensive and which
interfere very materially with the draught and efficiency of the furnace.
In consequence of these difficulties furnaces producing highly diluted fumes such as
the reverberatory furnace (altho' well adapted for smelting or other treatment of lead)
are often discarded in favor of furnaces producing a less diluted fume but which are
otherwise not so well adapted to the work.
My invention has for its object, to extract the whole or the greater part of the
valuable contents of diluted fume in a more convenient and economical apparatus and
at the same time to avoid interference with the draught of the furnace.
I employ a series of iron syphon pipes corrugated so as to increase the cooling
surface, or plain, and either surrounded with water or moistured with water or merely
exposed to a current of air like the condensing pipes used in a gas works. I fix these
pipes vertically on the upper side of two contiguous paralel flues leading from the
furnace to the chimney in such a way as that each pipe forms a communication
between the two flues and I prefer to make the pipes a good deal flattened in form
instead of round so as more effectually to cool the gases passing through them. The
arrangement of the before mentioned flues and pipes is such as that if one of the flues,
which for convenience of description I call flue A. was open to the furnace at the

page_text: gases
furnace end and closed by a damper or partition at the chimney end, and the other
flue, which for convenience of description I call flue B. was closed at the furnace end,
and open at the chimney end, the gases from the furnace passing into flue A. would
pass by the syphon pipes from flue A to flue B and so to the chimney; and if a series
of dampers or partitions are placed in the flues A and B. alternately the would
pass by the syphon pipes on the furnace side of the first partition in flue A. into B. and
from flue B by the second syphon pipe into flue A, and so on throughout the whole
range. The partitions may be alternated in the flues A. and B, so as to throw 2 or 3
pipes into the course of the flue, but for convenience I describe it as if for each pipe
seperately.
To explain further the action of the apparatus I will call the two limbs of the syphon
pipe the limbs A and B. The limb A being that of each syphon pipe receiving the
fume from the direction of the furnace, and the limb B that side of the syphon pipe
delivering the fume in the direction of the chimney. The furnace fumes invariable
ascend by the limb A, and descend by the limb B. As the fume becomes cooled its
density is increased as is well understood, and the result is that in every syphon
arranged as I have described there is a tendency in the contents to flow forward to the
chimney independently of any chimney draught and due to the greater density of the
gas in the limb B as compared with the density in limb A.
The particles of metalic compounds depositing in the pipes fall into the flues A
and B. and are cleaned out as occasion requires.
My invention may be combined with the use of any other appliances for further
treatment of the fumes and it may be used either with suction apparatus forced
draught in the furnaces or chimney draught or otherwise.
By means of the apparatus described I am enabled to use without inconvenience a
larger than usual quantity of air in the oxidizing stage of the lead smelting process,
and to use reverberatory furnaces instead of other forms of furnace for operations for
which that form of furnace is best adapted.
JAMESON & SCHAIFFE,
Agents for John Warwick.

page_text: Improvements in the Treatment of Fume in Lead Works.
I, JOHN WARWICK of No. 108 Rye Hill, in the City and County of Newcastle-on-
Tyne, Lead Manufacturer, do hereby declare the nature of my invention for
IMPROVEMENTS IN THE TREATMENT OF FUME IN LEAD WORKS, and in what manner
the same is to be performed, to be particularly described and ascertained in and by the
following statement
My invention applies especially to the fumes containing lead which arise from
reverberatory furnaces and has for its object the recovery of the contained lead in
apparatus of a simple construction. The method usually employed at present for the
recovery of lead contained in considerably diluted fume is to pass the fume through a
great length of flue of considerable size where by its slow passage the suspended
particles of metalic matter may settle out, there is however always a great expense and
often a great difficulty in constructing such flues of adequate size and length in a lead
works. There are other methods of collection of such suspended particles such as
washing the fume in scrubbing towers which however are troublesome and expensive
and which interfere very materially with the draught and efficiency of the furnace.
In consequence of these difficulties furnaces producing highly diluted fumes such as
the reverberatory furnace (although well adapted for smelting or other treatment of
lead) are often discarded in favor of furnaces producing a less diluted fume but which
are otherwise not so well adapted to the work.
Having thus described the nature of my invention I will proceed to more
particularly describe the manner in which the same is to be performed reference being
had to the drawings hereto attached in which Fig. 1 is a section through V. W.
Fig. 3; Fig. 2 is a section through X. Y. Fig. 1. and 3. and Fig. 3 is a section through
T. U. Fig. 1 and Fig. 2. S is a supporting bar to keep the pipes in position only.
My invention has for its object to extract the whole or the greater part of the valuable
contents of diluted fume in a more convenient and economical apparatus and at the
same time to avoid interference with the draught of the furnace. I employ a series of
iron syphon pipes corrugated so as to increase the cooling surface, or plain, and either
surrounded with water or moistured with water or merely exposed to a current of air
like the condensing pipes used in a gas works. For convenience of description I show
in the drawing hereto attached a series of pipes exposed only to the action of the
surrounding air which pipes are each marked with the letter P. I fix these pipes
vertically on the upper side of two contiguous parallel flues leading from the furnace
to the chimney in such a way as that each pipe forms a communication between the
two flues and I prefer to make the pipes a good deal flattened in form instead of round
so as more effectually to cool the gases passing through them. The contiguous paralel
flues are marked A and B. and the section of the pipes is shewn in Fig. 2. The
arrangement of the before mentioned flues and pipes is such as that if one of the flues
which for convenience of description I call flue A. was open to the furnace at the
furnace end and closed by a damper or partition at the chimney end, and the other
flue which for convenience of description I call flue B was closed at the furnace end
and open at the chimney end the gases from the furnace passing into flue A would pass

page_text: by the syphon pipes from flue A to flue B and so to the chimney and if a series of
dampers or partitions are placed in the flues A. and B. alternately the gases would
pass by the syphon pipes on the furnace side of the first partition in flue A-into B and
from Hue B by the second syphon pipe into flue A, and so on throughout the whole
range. In the flues A and B, I have shewn a series of partitions each marked C, so
arranged as that the course of the fume is through one pipe of the series at a time.
If the series was more extended and every alternate partition C. way omitted the
course of the fume would be through two pipes at a time and so on. The partitions
may be alternated in the flues A and B so as to throw two or three pipes into the
course of the flue, but for convenience I describe it as if for each pipe seperately. To
explain further the action of the apparatus I will call the two limbs of the syphon pipe
the limbs, a, and, b. The limb, a, being that of each syphon pipe receiving the fume
from the direction of the furnace and the limb, b, that side of the syphon pipe
delivering the fume in the direction of the chimney. The furnace fumes invariable
ascend by the limb a, and descend by the limb, b. As the fume becomes cooled its
density is increased as is well understood and the result is that in every syphon
arranged as I have described there is a tendency in the contents to flow forward to the
chimney independently of any chimney draught and due to the greater density of the
gas in the limb, b, as compared with the density in limb a. The course of the
fume in the arrangement. I have shewn is indicated in the drawing by arrows.
The particles of metalic compounds depositing in the pipes fall into the flues A,
and B, and are cleaned out as occasion requires.
My invention may be combined with the use of any other appliances for further
|_ treatment of the fumes and it may be used either with suction apparatus, forced
draught in the furnaces or chimney draught or otherwise.
By means of the apparatus described I am enabled to use without inconvenience a
larger than usual quantity of air in the oxidizing stago of the lead smelting process
and to use reverberatory furnaces instead of other forms of furnace for operations for
which that form of furnace is best adapted.
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 :-
The arrangement of a series of vertical cooling pipes for the treatment of lead fume
wherein cooling and condensation of fume is effected in small space and wherein the
different densities of heated and cooled fume are used to promote draught, substantially
as described.