for Apparatus or Appliances in Combination with Furnaces Roasting Pyrites and other Minerals Containing Sulphur for Cooling the Sulphurous Gases given off therefrom.
Year: 1888

page_text: for
Apparatus or Appliances in Combination with Furnaces
Roasting Pyrites and other Minerals Containing Sulphur for
Cooling the Sulphurous Gases given off therefrom.
We, HEINRICH ALBERT, of Biebrich on the Rhine Germany, Manufacturer, and
CHRISTIAN FELLNER, and CARL ZIEGLER, both of Bockenhein, Frankfort on the
Maine, Germany, Engineers, 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 :-
"
In roasting pyrites and other minerals containing sulphur the resulting sulphurous
acid gases generally pass off at such a high temperature as to injure the "Glover
Towers or other apparatus, such as lead chambers, in which they are further treated,
or converted into sulphuric acid, thus entailing considerable expenso for frequent
repairs and otherwise seriously impeding the manufacture of sulphurous or sulphuric
acid, and the salts that may be directly produced therefrom.
According to the present invention we obviate this defect and at the same time
utilize the considerable heat contained in such sulphurous gases by causing them on
leaving the roasting chamber to pass through apparatus either in close proximity to or
directly upon the furnace, where they are brought into contact with pipes or channels
through which currents of cold air, or other suitable fluid such as water, is made to
pass, so as to effectually take up the heat from the gases before these pass away to the
Glover Tower or other apparatus, while the heat taken up by the air or other fluid
may be further utilized for heating, drying or evaporating purposes. The air current
is made to flow in the contrary direction to that in which the gases flow, so as to cause
the heat to be taken up in the most efficient manner.
"
Figs. 1 and 2 of the accompanying drawings shew respectively a vertical section and
a sectional plan of one construction of the above described apparatus in which this is
arranged at the end of the roasting furnace A.:

page_text: "
The apparatus consists of a brickwork chamber communicating at C with the
roasting furnace and at D with the flue E leading to the "Glover Tower
or other
apparatus in which the gases are to be treated, both openings being provided with
valves F F by means of which they can be regulated or closed. In the chamber B
are two main pipos G G' connected together by a series of smaller bent pipos G² G²
so that cold air forced by a fan or other blast through the pipe G will pass thence
through the pipes G² to G¹.
The hot gases entering the chamber B at C from the roasting furnace are caused by
a partition B¹ first to descend and then to ascend again on their way to the
opening D, and are thereby brought into intimate contact with the outer surfaces of
the pipes G³ through which the air is flowing in the contrary direction, as indicated by
the arrows.
By this means the heat of the gases will be most effectually given off to the air so
that the temperature of the former, which on entering is from 400° to 500° C, will
have been reduced to about 200° C by the time they reach the escape opening D, and
this temperature can be maintained approximately constant by regulating the
flow of the air through the pipes and of the gases through the chamber by the
valves F F
By oponing the valve H commiunicating with the flue E and closing the valves F F¹
the whole of the gases can be made to pass directly through the flue E to the "Glover
Tower" when the chamber B requires to be cleared of any deposit of dust.
The furnace A may be provided with two such before described cooling chambers,
so that the gases can be passed through the one while the other is being cleared, or
both may be used simultaneously if required.
As a number of the roasting furnaces A are usually arranged side by side, the
pipes G G¹ may be arranged to pass continuously through the chambers B of all the
furnaces, so that the cold air is made to pass simultaneously from the pipe G to the
pipe G through the pipes G2 of all the cooling apparatus, the highly heated air
passing from the ond of the pipe G¹ being then conducted whereever required
for carrying out heating, evaporating or drying processes, or for supplying the
requisite hot air for combustion in furnaces, and thus offecting a considerable economy
in fuel.
J
By reducing the temperature of the sulphurous gas to a moderate degree as above
described, not only is the "Glover Tower" preserved from injury to a great degree,
but it may in certain cases be replaced by comparatively inexpensive apparatus with
earthenware tubes.
The roasting furnace A may be of any known construction, and requires no further
description ; II are the charging hoppers.
Figs. 3 and 4 shew respectively a vertical section and a sectional plan of an arrange-
ment in which the cooling apparatus is constructed upon the top of the roasting
furnace A. B is a long narrow horizontal chamber communicating at C with the
furnace, and at D with the flue E leading to the "Glover Tower." G G are as before
the main cold and hot air pipes, and G2 are the connecting pipes, with which the gases
are brought into intimate contact on their way to the outlet D.
Having now particularly described and ascertained the nature of this in-
vention and in what manner the same is to be performed, We declare that what
we claim is :-
""
1. The combination with a furnace for roasting pyrites or other minerals containing sul-
phur, of apparatus for cooling the sulphurous gases passing off from the furnace, consisting
of a chamber communicating at one end with the furnace and at the other end with a
flue leading to the "Glover Tower or other apparatus, in which chamber are pipes
or passages through which cold air or other cold fluid is made to flow, while the
gases are made to flow in the opposite direction in contact with the outer
surfaces of such pipes or passages, substantially as and for the purposes herein
described.

page_text: 2. The combination with a furnace for roasting pyrites or other minerals
containing sulphur, of apparatus for cooling the sulphurous gases given off.
constructed and operating as herein described with reference to Figs. 1 and 2 of the
drawings.
3. The combination with a furnace for roasting pyrites or other minerals containing
sulphur, of apparatus for cooling the sulphurous gases given off, constructed and
operating as herein described with reference to Figs. 3 and 4 of the drawings.
Dated this 5th day of November 1888.
ABEL & IMRAY,
Agents for the Applicants.