An Improved Apparatus for Filtering Potters' Slip.
Year: 1896

page_text: Date of Application, 18th Sept., 1896-Accepted, 19th Dec., 1896
COMPLETE SPECIFICATION.
An Improved Apparatus for Filtering Potters' Slip.
1, OTTO SCHALLER, of Saaz, Bohemia, Hungary, Inventor, 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 has for its object to extract the particles of kaolin, clay, and
other minerals suspended in water, without making use of separators and filter--
presses, and without motive power.
This new method for the extraction of slimy substances consists chiefly
in the use of sand in the filtering apparatus, the use of separators, filter-presses,.
pumps (mud pumps), as well as the motive power required for pressing operations,.
being, as above mentioned, rendered unnecessary.
According to my invention the cost of extracting or separating the slime.
is brought down to a minimum, and the slime can be separated in large or small
quantities.
In order that my invention may be better understood and more readily carried
into effect I will describe it with reference to the accompanying drawings, in
which,
Figure 1 is a vertical section of my improved kaolin filter on line X--X of
Figure 2.
Figure 2 is a plan of the filter.
Figure 3 illustrates a slime box in vertical section on line Y-Y of Figure 4.
Figure 4 is a plan of the slime box.
The filter consists of a box or casing of suitable size and material, having sides.
or walls a, b, c, d, and a bottom e, the top of the box being open. In the bottom e
is an outlet for the water, upon which is placed a cover or lid g. Three layers
of sand S', S, S³, are placed in the box, the lowermost layer ST of coarse sand
being about 8 inches deep, the layer S which is of finer sand being about
10 inches deep, and the uppermost layer of the finest sand is also about 10 inches.
deep. The depth or thicknesses of these layers of sand may be varied.
Above
these layers of sand a sack or filter cloth of cotton material is suspended said
cloth being attached to the frame k which is placed in a suitable position in the
box or casing. The sack or filter cloth h occupies the whole area of the box and
has for its object to prevent slime from permeating the uppermost layer of sand S³,.
which would render the latter impervious to water and the apparatus useless after a
short time; it further prevents fine particles of sand from reaching the lower layer
of the precipitated slime. In order to raise the latter in a suitable manner, there
are placed on the bottom of the sack h, which as before mentioned is above the
uppermost layer of sand S, a number of boxes or trays (in the drawing numbered
1 to 16), made of sheet zinc or other suitable material; the bottoms of these boxes or
trays are formed of porous or easily permeated fabric, t Figure 4.
The action of my invention is as follows:-
When the apparatus is filled the water permeates after a certain time through.
the layers of sand S, S, S', and runs off through the outlet (Fig. 1) to a
suitable receptacle and can be again used for elutriating purposes. The slime mud
is deposited in the zinc boxes or trays and is removed with the latter in order to
be laid on drying ground or in a drying shed. When the slime is sufficiently dried
the hoxes are turned over and on being tapped or knocked on the ground a cake of
the dried material is obtained.

page_text: 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 :-
A kaolin filter consisting of a box, casing, or receptacle partly filled with
sand S', S', S' and containing a filtering fabric which separates the sand from
the filter space and upon which zinc frames or boxes with bottoms of permeable
material to receive the kaolin are placed, substantially as described with reference
to the accompanying drawing.
Dated this 18th day of September 1896
JOHN P. O'DONNELL, Fel. Chart. Inst. P.A.,
70 & 71 Palace Chambers, Westminster, S.W.
Agent for the said Applicant.