Year: 1894

page_text: Date of Application, 29th June, 1894
Complete Specification Left, 29th Mar., 1895-Accepted, 29th June, 1895
Communication Irom abroad by ALBERT GOULD DAVIS, Examiner, of
Middlesborough, State of Kentucky, one of the United States of America.
I, JOHN EDWARD LLOYD BARNES, of the Firm of Sloan & Lloyd Barnes,
of Castle Chambers, Castle Street, Liverpool in the County of Lancaster,
Patent Agent, do hereby declare the nature of this invention to be as follows:-
This invention relates to ore roasters of the Davis-Colby type, well known to
those skilled in the art, and consists particularly in taking the air for combustion
from the outside to a chamber, passing it from said chamber across the ore at the
lower part of the ore chamber, where it absorbs a part of the heat of the ore,
cooling the ore and heating the air. The air passes to a collection space directly
outside the outer wall of the ore chamber in a heated condition and thence passes
to the combustion space, the gas being supplied to this space at the same time.
Instead of thus directing the air, I may reduce the ore or magnetise it by directing
the gas supply in a Davis-Colby roaster to a chamber in the draft space of the
furnace and thence draw it across the ore to a chamber below the combustion
chamber, and from this chamber directly to the combustion chamber.
The Davis-Colby roaster may be stated generally to consist of a roasting chamber
into which the ore is fed, a draft space and a combustion chamber; the ore space
heing located between the draft space and combustion chamber with openings in
the walls thereof for the passage of the heat across the ore space and through the
ore contained therein. The ore as it is roasted and reduced gradually feeds
downward to a point of discharge. The roaster is intended to utilise gas and air
as a fuel and in my present invention I add to the roaster as above described,
a regenerator for the air, and, instead of passing the air directly to the combustion
chamber, I draw it into a chamber at the lower end of the draft space, thence it is
drawn through the lower part of the ore space to a receiving chamber and from
this receiver it passes to the combustion chamber mingling with the gas supply
introduced near the point of entrance of the air. The effect is that the air cools
the reduced and roasted ore at the point of discharge taking up this heat so that
when the air reaches the combustion chamber it is hot and thus the combustion of
the air and gas is promoted. Additional air may be admitted if found necessary
from the ordinary air openings in the outer wall of the roaster.
To magnetise or reduce the ore by the use of gas I may direct the gas in
substantially the same way instead of the air, drawing the gas into the chamber at
the lower end of the draft space, across the ore space to a receiving chamber
provided with openings to the combustion chamber. The gas main is also provided
with direct connections to the receiving chamber so that the gas supply may be
supplemented directly when found necessary. Air may be fed as usual to the
combustion space.
The combustion space and the collection space may be
separated from each other and connected with each other through a suitable port,
or the said spaces may be parts of the same chamber.
Dated this 28th day of June 1894.
SLOAN & LLOYD BARNES,
Castle Chambers, 26 Castle Street, Liverpool,
Agents for the Applicant.

page_text: A communication from abroad by ALBERT GOULD DAVIS, Examiner, of
Middlesborough, State of Kentucky, one of the United States of America.
I, JOHN EDWARD LLOYD BARNES, of the Firm of Sloan & Lloyd Barnes,
of Castle Chambers, Castle Street, Liverpool in the County of Lancaster, Patent
Agent, 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:―
My invention relates to ore roasters of the Davis-Colby type, in which the ore is
contained in a narrow vertical space between two side walls and is subjected by a
continuous process to several operations or treatments.
The invention comprises a vertically extending ore roasting space, having an
upper inlet and a lower outlet; combustion and draft chambers located on opposite
sides of the upper part of the ore roasting space and communicating therewith ;,and
supply and collection cliambers arranged on opposite sides of the lower part
of the roasting space, and having openings leading thereto, whereby,. depending
upou the particular construction of the furnace, air may pass through the
ore space from the supply to the collection chamber, being heated in its. passage,
and diminishing the heat of the ore and from the collection chamber passing to the
combustion chamber, and thence with the gas passing again through the ore space
to the draft chamber. Or I may reduce the ore or magnetize it by directing the
gas supply to the said supply chamber, drawing it thence across the ore, reducing
it, to the collection chamber, and thence to the combustion chamber,, whence it is
again drawn across the ore space to the draft chamber..
The invention is illustrated in the accompanying drawings, in which:
Figure 1, is a central vertical section through a kiln on line - of Figure 2.
Figure 2, is a section on line y-y of Figure 1.
Figure 3, is a sectional elevation of a modified form.
Figure 4, is a half section on line z-z of Figure 3, and
Figure 5, is a sectional view illustrating a still further variation of form.
Figure 6-is a sectional view of a modified form of kiln of the magnetizer type.
Referring by letter to the drawings, in the upper part of the kiln the combustion
chamber is represented at A., Figures 1 and 2, and this may be supplied with hot
or cold gases or both from any suitable source and in any well known or desirable
manner. The space or chamber for the ore is represented at E, and consists of a
narrow vertical chamber having a flaring upper end to receive the ore as at E' and
a suitable delivery portion E³. In the upper part of the furnace directly opposite
the combustion chamber is located a draught chamber B connected by a pipe B¹
with any suitable draught source. The walls between the chambers A. and B and
the ore chamber are provided with ports or flues a, b, through which the products
of combustion pass directly across from the combustion chamber to the draught
chamber.
The lower part of the furnace consists of a pair of chambers C, D, arranged one
upon each side of the ore space or chamber in a manner similar to A and B, and
having ports c, d, communicating with the ore chamber.
One of the chambers is supplied with air or with some gas such as producer gas
and the other chamber acts as a collecting chamber for the gas after it has passed
through the ore.
The gas is supplied to the chamber C, and passing from this across the ore space
enters the collection chamber D and from here it may be passed to the combustion
chamber A or said chamber may have an independent supply leading thereto.

page_text: If desired, the kiln may be constructed in the form shown in Figures 3 and 4
about a centre B' in which case the ore chamber and the chambers A' and D¹
are in the form of annular chambers surrounding the central chambers B¹
and C¹.
In Figure 5, have shown a modification in which the combustion chamber A²
and the collecting chamber D2 are placed in the centre and the draft and gas
supply chambers B2 and 2 are arranged upon the outside.
As shown in Figure 6-I may modify the construction, and in this form I direct
the gas from the main A" through the conduit B³ to the supply chamber C1
located to one side-of-the-lower-part of the ore space. The gas is drawn across the
ore space reducing the ore and passes into a collection chamber E' and thence into
a combustion chamber G', and thence across the ore space again with an additional
supply of gas and air to the draft space and outlet. With this construction, the gas
main A is provided with direct connections to the collection chamber E' so that
the gas supply may be supplemented when found necessary. As shown the
collection space E' and the combustion space G¹ are separated from each other, and
connected by suitable ports.
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. An ore roasting furnace comprising the vertically extending ore roasting space
having an upper and a lower outlet, the combustion and draft chambers located on
opposite sides of the upper part and having openings communicating with the
roasting space whereby the gases may be passed across the roasting space, and
a second pair of chambers arranged on opposite sides of the lower part of the
roasting space and above the outlet therefrom, one of said lower chambers being a
supply and the other a collection chamber and having openings into the roasting
chamber, substantially as described.
2. An ore roasting furnace comprising the vertically extending ore roasting
space having an upper inlet and a lower outlet, the draft and supply chambers
located on one side of the ore roasting space and at the top and bottom thereof
respectively, and the combustion and collection spaces arranged on the opposite side
of the ore roasting space, and at the upper and lower parts thereof respectively,
said chambers being independent of each other and the collection and combustion
spaces communicating with each other and all communicating with the ore roasting
space, substantially as described.
3. The method of partially reducing metallic oxides which consists in passing
said ores in a practically continuous operation through a chamber, at the same time
maintaining in the upper portion of said chamber a high temperature by
continuously passing across said chamber a stream of gases at a high temperature,
and simultaneously maintaining in the lower portion of said chamber a reducing
atmosphere by passing across or through said lower portion a stream of reducing
gases; substantially as described.
4. The method of treating ores or other mineral substances which consists in
continuously drawing them through a narrow chamber by their own weight, and
passing a stream of gases across the lower portion of said chamber, taking said gases
to a combustion chamber and there burning them, and thence passing them across
the upper portion of said narrow chamber; substantially as described.
Dated this 28th day of March 1895
SLOAN & LLOYD BARNES,
Castle Chambers, Castle Street, Liverpool,
Agents for the Applicant.
SLOAN & LLOYD BARNES,
Castle Chambers, Castle Street, Liverpool,
Agents for the Applicant.