Obtaining or Recovering Small Coal in Coal Washing.
Year: 1891

page_text: Date of Application, 16th May, 1891
Complete Specification Left, 1st June, 1891-Accepted, 25th July, 1891
PROVISIONAL SPECIFICATION.
Obtaining or Recovering Small Coal in Coal Washing.
We, HEINRICH KOEHL, Metallurgical Works Manager, and JACOB SIMON,
Washing Foreman, both of Walstatt-Burbach, Germany, do hereby declare the
nature of this invention to be as follows:-
In the mud produced by the wet treatment of coal, there is still contained a
considerable quantity of valuable small coal which has hitherto been wasted.
The present invention has for object to obtain or recover this fine coal from the
said mud.
For this purpose the washing water passing off from the coal washing, with the
slate and the box sand ("Kastensand ") consisting chiefly of particles of slate and
pyrites is separated from that which carries the coal mud, by allowing the former
to run into clarifying or settling channels or sumps provided for this purpose.
The waters carrying the coal mud are, before their entry into the clarifying sumps,
conducted over one or more movable sieves; the fine coal is then retained by
the sieves.
The wash water passing through the sieve contains only mud of no value, and is
conducted to the clarifying sump. The fine coal thus obtained is poor in ashes..
The kind, number, size and width of mesh of the sieves, and the transport
of the small coal obtained, to the places of utilization, depend on the local
circumstances.
The arrangements above mentioned will now be briefly described with reference
to the accompanying drawings, in which,
Fig. 1 is a transverse section, and
Fig. 2 a longitudinal part section of an arrangement according to this invention.
Fig. 3 being a detail view to a larger scale.
The arrangement illustrated in the drawings is here only given by way of example,
and may vary considerably as to construction without affecting the nature of
the process.
The coal bearing mud waters are conveyed by means of the channel b on to the
shaking sieves a. The worthless mud passes with the water through the sieves into
the clarifying sumps K S. The fine coal which remains behind on the sieves a
passes by reason of the shaking motion of the sieves, into the common outflow
channel and thence into the bucket elevator d which is furnished with perforated
buckets. The bucket elevator lifts the fine coal obtained into a storage tower.
с
The horizontal movement of the shaking sieve may be effected by means of
eccentrics e, and the vertical movement is effected by means of the tappets f the
eccentrics and tappets being mounted on rotary shafts driven by a suitable motor.
Dated this 16th day of May 1891.

page_text: COMPLETE SPECIFICATION.
Obtaining or Recovering. Small Coal in Coal Washing
We, HEINRICH KOEHL, Metallurgical Works Manager, and JACOB SIMON,
Washing Foreman, both of Walstatt-Burbach, Germany, 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 the mud produced by the wet treatment of coal, there is still contained a
considerable quantity of valuable small coal which has hitherto been wasted. The
present invention has for object to obtain or recover this fine coal from the
said mud.
..
For this purpose the washing water or muddy liquid which carries with it both
the small coal to be separated and also the slate and the box sand ("Kastensand ").
consisting chiefly of slate and pyrites is caused to pass first into a clarifying sump
in which the specifically heavier slate "Kastensand" etc. is deposited, and whence it
is withdrawn by means of a bucket elevator. The small coal continues to float in
the muddy liquid and is carried thereby from the sump into an arrragement of sieves
and bucket elevators as hereinafter described.
The washing water that passes through the sieve or sieves contains in suspension
only mud or earthy impurities of no value, and is conducted to other clarifying sumps.
The fine coal thus obtained yields very little ash when burnt. The kind, number and
size of the sieves used, the size of mesh thereof, and the mode of transporting the
small coal obtained as described, to the place where it is to be utilized or stored,
depend on the local circumstances.
-
In order that the nature of the invention may be fully understood we will now
more particularly explain the same by reference to the drawings filed with our
Provisional Specification in which
Fig. 1 is a transverse section; and
Fig. 2 a longitudinal part section of apparatus for carrying out our invention.
Fig. 3 is a detail view to a larger scale.
The arrangement illustrated in the drawings is given by way of example only,
and may vary considerably as to construction without affecting the nature of the
invention.
1:
The washing water or muddy liquid containing small coal, together with the slate
pyrites etc. to be separated passes first into the settling channel or sump N in which
the heavier slates, pyrites etc. are deposited and whence they are removed by a
bucket elevator. From this settling channel or sump the washing waters containing
small coal and mud in suspension are conveyed by means of the channel 6 on to the
shaking sieves a. The worthless mud passes with the water through the sieves into
the clarifying sumps K S. The small coal which remains behind on the sieves a,
passes by reason of the shaking motion of the sieves, into the common outflow
channel c and thence into the bucket elevator d which is furnished with perforated
buckets. The bucket elevator lifts the small coal obtained into a storage tower.
The horizontal movement of the shaking sieves is effected by means of eccentrics, e,
and the vertical movement; by means of the tappets f, the eccentrics and tappets
being mounted on rotary shafts driven by a suitable motor.
C
Having now particularly.described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
The herein described method of obtaining or recovering small coal from the mud
produced in coal washing, consisting in causing the washing waters containing small
coal and mud in suspension, to flow, previous to their entry into the clarifying or

page_text: settling sumps or channels, over one or more moving sieves, by which the small coal
is arrested and by the movement thereof is caused to pass into an outflow channel
substantially as described.
HEINRICH KOEHL,
By L. W., per F. B.
JACOB SIMON,
By L. W., per F. B.