Substances, and in the Linings therefor.
Year: 1884

page_text: Substances, and in the Linings therefor.
I, PIULIP MIDDLETON JUSTICE of 55 and 56 Chancery Lane, in the County of
Middlesex, Fellow of the Institute of Patent Agents do hereby declare the nature
of said invention for "IMPROVEMENTS IN FURNACES FOR BURNING CEMENT AND
OTHER SUBSTANCES AND IN THE LININGS THEREFOR a communication to me
from abroad by Carl Dietzsch of Malstatt in the Empire of Germany cement
manufacturer, to be as follows:—
"
According to this invention the furnace contains a cooling space, a burning space,
a pre-heating space and a connecting passage between the pre-heating and burning
spaces. In the burning space the heat can be so augmented as to cause the
material to pass over in a soft viscous state. In order to prevent the viscous
material from cooling and remaining fixed in a suspended position to the walls it is
necessary to allow the burnt material to sink down at the proper time or to move
it forward by artificial means. As the intervals of time for the sinking down of
the material are limited the contents of the furnace are best and most regularly
burnt when the furnace walls are not too far apart. Circular furnaces are therefore
limited to a certain size, and large furnace spaces can be best obtained in the
oblong form. This oblong form should only vary slightly as regards width but
may be increased or decreased considerably in its length without destroying the
efficiency of the furnace. The dimension will unturally vary somewhat according
to the properties of the material to be burnt. The furnace as described i prefer
to line with basic material which will stand the action of the fire and of the
material being burnt better than the acid lining generally employed. I therefore
propose to form the lining of the furnace in the following manner.
Marlstone of the dolomite formation which contains from 60 to 85 per cent of
lime and magnesia, is highly burnt so that it forms a silicate soluble in muriatię

page_text: acid. This silicate is mixed with burnt dolomite in such proportion that the
material after the burning operation will neither break up upon exposure to the air
nor expand.
The material is then moistened with water and pressed into the form of bricks.
After exposure to the air for some time these bricks become hard and are then
suitable for use in lining the furnace or they may be first burnt before being so
used, or the bricks may be formed of Portland or like cement mixed with lime or
dolomite, and pressed into shape when they may be exposed to the air to harden
and then built into the furnace or burnt before using, or a mixture of crude lime
magnesia and clay may be used for the lining.

page_text: Substances, and in the Linings therefor.
I PHILIP MIDDLETON JUSTICE of 55 and 56 Chancery Lane in the County of
Middlesex Fellow of the Institute of Patent Agents do hereby declare the nature
of the said invention for IMPROVEMENTS IN FURNACES FOR BURNING CEMENT AND
OTHER SUBSTANCES, AND IN THE LININGS THEREFOR, & communication to me from
abroad by Carl Dietzsch of Malstatt in the Empire of Germany, Cement Manu-
facturer and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The Invention relates to an improved form of the furnaces employed in burning
cement and also to the linings therefor. To clearly explain the construction of the
furnace employed reference is made to the accompanying drawings in which,
Fig. 1. is an elevation partly in section of the improved furnace.
Fig. 2. is an end elevation partly in section, and
Fig. 3. is a plan of Fig. 1, the left hand portion being a section taken through
the passage D of Fig. 1.
In the drawings A is the cooling space; B the burning space; C the pre-heating
space and D the connecting passage between the pre-heating and burning spaces.
In the burning space B, the heat can be so augmented as to cause the material to
pass over in a soft viscous state. In order to prevent the viscous material from
cooling and remaining fixed in a suspended position to the walls it is necessary to
allow the burnt material to sink down at the proper time or to move it forward by
artificial means. As the intervals of time for the sinking down of the material are
Jimited, the contents of the furnace are best and most regularly burnt when the
furnace walls are not too far apart. Circular furnaces are therefore limited to a
certain size, but it has been found that large furnace spaces can be best obtained in
the oblong form as shown in the drawings. This oblong form should only vary
slightly as regards width but may be increased or decreased considerably in its
length without destroying the efficiency of the furnace. The dimension will
naturally vary somewhat according to the properties of the material to be burnt.
The furnace as described it is preferred to line with basic material which will
stand the action of the fire, and of the material being burnt, better than the acid
lining generally employed.
I therefore propose to form the lining of the furnace in the following manner.
Maristone of the dolomite formation which contains from 60 to 85 per cent of
lime and magnesia, is highly burnt so that it forms a silicato soluble in muriatic
acid.
This silicate is mixed with burnt dolomite in such proportion that the material
after the burning operation will neither break up upon exposure to the air nor
expand. The material is then moistened with water and pressed into the form of
bricks. After exposure to the air for some time, these bricks become hard, and
are then suitable for use in lining the furnace, or they may be first burnt before
being so used or the bricks may be formed of Portland or like cement mixed with

page_text: lime or dolomite, and pressed into shape, when they may be exposed to the air
to harden and then built into the furnace or burnt before using; or a mixture of
crude lime magnesia, and clay may be used for the lining.
Having now particulary described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to me
by my foreign correspondent I declare that what I claim is
1. The improvement in the construction of furnaces for burning cement, and like
materials, which consists in giving the burning and cooling spaces an oblong form
substantially as described and for the purposes set forth.
2. The improved furnace for burning cement, as described said furnace being
lined with basic materials substantially as set forth.