Improvements relating to the Extraction of Carbonic Acid from Minerals, and to Apparatus therefor.
Year: 1891

page_text: Date of Application, 6th Aug., 1891-Accepted, 12th Sept., 1891
COMPLETE SPECIFICATION.
Improvements relating to the Extraction of Carbonic Acid from
Minerals, and to Apparatus therefor.
I, ADOLF LUDWIG HEINRICH KNoor, of Marienstrasse, Minden, Westphalia
in the Empire of Germany, Merchant, do hereby declare the nature of this inven-
tion 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 the extraction of carbonic acid from minerals and to
apparatus therefor.
In my improved process I make use of the property possessed by carbonates, that
when they are finely crushed they form a mass which flows with difficulty but when
heated will be changed into a powder which flows as freely as dry sand.
The minerals which have previously been finely crushed are conducted through
the space between two heated pipes placed concentrically one inside the other, the
supply or feed taking place from above, whilst the discharge of the heated mass
in consequence of the above mentioned property of the heated pulverulent minerals
can be effected, without the use of mechanical means, simply by opening the valve
or door of the heating space formed by the concentric pipes.
In the accompanying drawing the two pipes placed one inside the other are
designated by e and f. The former is closed at the top. The annular channel
formed by the said pipes communicates above the furnace with a feed device (not
shown) which must be hermetically closed.
g
The annular space i terminates at its lower end in the oblique channel which is
of flat form. By means of the valve or door the heating space is hermetically
closed at the bottom.
The heating of the two sides or walls e and takes place in such manner that the
heating gases are conducted from the fire place a, through the pipe b, upwards into
the heating pipe e and then pass downwards along the walls of the latter, and
through the coiled heating channels & round the second heated wall or side f.
Thus simultaneously an outer and inner heating of the layer of mineral powder
under treatment takes place.
The operation of my improved furnace is continuous, as the masses which have
been heated, upon opening the valve or door h, flow out like sand, whilst the masses
not yet sufficiently heated remain in the heating space on account of the power of
adhesion of their particles.
My improved furnace can also be used for such minerals yielding carbonic acid
which do not flow so freely when heated. In such cases it is only necessary to
facilitate the movement of the crushed or ground minerals by suitable mechanical
means. Such a mechanical means may be for instance a chain placed in the
furnace around the central pipe. By shaking or moving this chain the heated mass
can be set in motion in order to facilitate the flow of the same. Any other suitable
devices may be employed for the same purpose.
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 :-
First. The extraction of carbonic acid from minerals yielding carbonic acid
when heated, by causing the said minerals to flow down in a finely divided state
between two concentric heating walls or sides.
Second. In a furnace for the above described purposes the conducting of the
heating gases in such manner, that they pass upwards in the central pipe (b), then

page_text: downwards through the space (c) between the said pipe (b) and the inner heating
wall or side (e) and finally through the channel (d) surrounding the outer heating
wall or side (f).
Dated this 6th day of August 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.