Process for Obtaining a New Material from Bituminous Slate and its Application as a Filtering Medium and as a Colouring Matter.
Year: 1890

page_text: Date of Application, 28th Oct., 1890
Complete Specification Left, 15th July, 1891-Accepted, 15th Aug., 1891
PROVISIONAL SPECIFICATION.
Process for Obtaining a New Material from Bituminous Slate
and its Application as a Filtering Medium and as a Colouring
Matter.
I, JULIUS ZELLER, Manufacturing Chemist, of Eislingen, Württemberg, do
hereby declare the nature of this invention to be as follows:
This invention has for its object the better utilization of certain kinds of
bituminous slate, which have hitherto been employed for the manufacture of mineral
oil or of illuminating gas, while the residual coke from the retorts was allowed to
burn in the open air and was subsequently used as manure.
I have found, that certain kinds of bituminous slate (Posidonienschiefer), when
converted into coke in a special manner, forms an excellent filtering, and clarifying
medium and a colouring matter.
For this purpose, the said slate is ignited, either in the open air, or in suitable
furnaces, and as soon as the whole mass has been set aglow, it is slaked with water.
The coke thus obtained, is a mixture of very finely divided carbon or charcoal, with
the mineral constituents of the slate, that is chiefly clay and calcic carbonate. It
may be used either in small blocks or in the shape of a fine powder, crude or
washed, or after treatment with hydro-chloric acid, for purposes of filtration and
clarification, in water works and in chemical industries, for instance the manu-
facture of glycerine, spirit, vinegar, sugar, mineral oils, fatty oils, paraffin or
stearinc.
In many cases the coke thus produced is a complete substitute for boneblack or
is even superior to it, for instance in the manufacture of mineral oils and of
paraffin.
If the said coke is finely ground, it produces a quick-drying black colouring
matter, which is applicable in the manufacture of blacking for boots, instead of
boneblack, and in finishing black textile fabrics, instead of kaolin.
The heat produced in the burning of the slate for coke, may be utilized for
industrial purposes.
Dated this 28th day of October 1890
FAIRFAX & WETTER,
433, Strand, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Process for Obtaining a New Material from Bituminous Slate
and its Application as a Filtering Medium and as a Colouring
Matter.
I, JULIUS ZELLER, Manufacturer, of Eislingen, Württemberg, 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 :-
This invention has for its object, the better utilization of certain kinds of
bituminous slate, which have hitherto been employed for the manufacture of
mineral oil or of illuminating gas, for instance in Württemberg and Hohenzollern,
where the said slate is known as "Posidonienschiefer," while the residual coke from
the retorts was allowed to burn in the open air and was subsequently used as
manure.
I have found, that certain kinds of bituminous slate (Posidonienschiefer), when
Pine Al

page_text: converted into coke in a special manner, form an excellent filtering and clarifying
medium and a colouring matter.
For producing such a material, the said slate is ignited, either in the open air, in
stacks or piles, or in suitable ovens, and as soon as the whole mass has been set
aglow, it is slaked with water. The coke thus obtained, is a mixture of very finely
divided carbon or charcoal, with the mineral constituents of the slate, that is chiefly
clay and calcic carbonate. It may be used either in small blocks or in the shape of
a fine powder, crude or washed, or after treatment with hydro-chloric acid (in order
to remove the lime) for purposes of filtration and clarification, in water works and
in chemical industries, such as the manufacture of glycerine, spirit, vinegar, sugar,
mineral oils, fatty oils, paraffin or stearin.
In many cases the coke thus produced is a complete substitute for boneblack, or
is even superior to it, owing to its contents of clay, for instance in the manufacture
of mineral oils and of paraffin.
If the said coke is finely ground, it produces a quick-drying black colouring
matter, which is applicable in the manufacture of blacking for boots, as a substitute
for bone black, and in finishing black textile fabrics, as a substitute for kaolin.
The heat produced in the burning of the slate for coke, may be utilized for
industrial purposes, and the vapours and gases which escape are rendered innocuous
by combustion.
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 ;
1. The production of a special kind of coke, from bituminous slate, by igniting
the said slate, and after the entire mass has become aglow, slaking the same with
water, substantially as described.
2. The application of coke produced from bituminous slate in the manner
described, as a clarifying or filtering medium, as a colouring matter, or as a
substitute for kaolin, in the manner substantially as described.
Dated this 15th day of July 1891.
JULIUS ZELLER.
By Fairfax & Wetter,
433, Strand, London, Agents.