Process for Coking Mineral Coal and Lignite.
Year: 1899

page_text: Date of Application, 27th July, 1899
1000
PROVISIONAL SPECIFICATION.
Process for Coking Mineral Coal and Lignite.
I, HERMANN SCHILD, of 1, Not Strasse, Bochum, in the Province of West-
phalia, German Empire, Mechanician, do hereby declare the nature of this
invention to be as follows:-
-
The means which hitherto have been employed to increase the capacity of
coking of mineral coal and lignite merely have been of mechanical nature. The
object of the present invention is to increase the capacity of coking of dry burn-
ing coals by chemical means.
To attain this end I mix the coal to be coked with a certain quantity of the
lye resulting from the sulphite cellulose manufacture. Generally 10% of lye
with respect to the quantity of the coal will suffice but it is advantageous to fix
this amount by trials, as the same according to the different kinds of mineral
coal must suitably be varied. When this mixture is coked, the ash percentage
of the obtained coke is increased of about 0.5%. The acting substance of the
lye being calcium lignine sulphonate, the increase of the ash percentage may be
prevented by the addition of ammoniac salt, for instance carbonate of ammonium
or sulphate of ammonium. The coking of a mixture of lye and mineral coal
or lignite can be effected alone or together with good fossil coal.
The process is effected as follows:
The coal to be coked is crushed or small coal is employed. The mass then
is mixed with the lye in proportion of 10:1. Hereafter the mass thus humected
is treated in the coke-oven in the manner known to everybody skilled in the
art, and according to the kind of the coal, it is carbonised during about 36-48
hours. Advantageously a mixture of equal proportions of anthracite or lignite
and of fat coal is employed, or also dry burning coal and fat coal in the propor-
tion of 2:1. Hitherto fat coal alone or when mixed with other coals only in
proportion of 20:1 could be coked, now each kind of coal can be employed when
humected with the sulphate lye; also anthracite mixed with fat coal in equal
proportions can be coked and good results obtained.
Experiments have shown that a very good coke is obtained from these coals,
which hitherto were unfit for coking purposes.
Process for Coking mineral Coal and Lignite.
I, HERMANN SCHILD, of 1, Not Strasse, Bochum, in the Province of West-
phalia, German Empire, Mechanican, do hereby declare the nature of this inven-
[Price 8d1l

page_text: tion, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
The object of the present invention is to increase the capacity of coking of
dry burning coals by chemical means.
To attain this 1 mix the coal to be coked with a certain quantity of the lye
resulting from the sulphite cellulose manufacture. By boiling wood in calcium-
sulphite the obtained liquid being neutralized by carbonate forms sulphite
cellulose lye according to Mitscherlich). Though the above mentioned Ive has
often a variable specific weight, it always solutes the same substances in water,
particularly here the most important calcium lignine sulphonate. Generally
a quantity of the lye amounting to 10 per cent. of the quantity of the coal will
suffice, but it is advantageous to fix the amount in trying from case to case, as
this amount must be varied according to the different kinds of mineral coal.
When this mixture is coked, the ash percentage of the obtained coke is increased
of about 0.5 per cent. The acting substance of the lye being calcium lignine
sulphonate, the increase of the ash-percentage may be prevented by the addition
of ammoniac salt, for instance carbonate of ammonium or sulphate of ammonium.
The amount of the ammoniac salt to be added is equal to the amount of the car-
bonate contained in the lye. The coking of a mixture of lye and mineral coal
or lignite can be effected alone or together with good fossil coal.
The process is effected as follows:
The coal to be coked is crushed or small coal pieces are employed. The mass
is then mixed with the lye in proportion of 10:1. Hereafter the mass thus
wetted is treated in the coke-oven in the manner known to everybody skilled
in the art, and according to the kind of the coal, it is carbonised about 36-48
hours. Advantageously a mixture of equal proportions of anthracite or lignite
and of bituminous coal is employed, or also dry burning coal and bituminous
coal in the proportion of 2:1. Hitherto bituminous coal alone, or when mixed
with other coals only in proportion of 20:1 could be coked, while now each kind
of coal can be employed when treated with the sulphite lye; also anthracite
mixed with bituminous coal in equal proportions can be coked giving good
results.
Experiences according to my new process have shown, that a very good coke
is obtained from these coals which hitherto were unfit for coking purposes, as
by the addition of lignine sulphonate the coking capacity of the coal is increased.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is: :-
Process for coking coal, consisting in mixing the small or the crushed coal
with about 10 per cent. of the lye resulting from the sulphite cellulose manufac-
ture, treating the mass with a salt of ammonium, such as carbonate or sulphite
of ammonium and coking the whole in the coke-oven, substantially as described.
Dated this 22nd day of March 1900.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester,
Agents for the Applicant.