IMPROVEMENTS IN THE TREATMENT OF THE WASTE LIQUOR PRODUCED IN PICKLING IRON
Year: 1883

page_text: LETTERS PATENT to Llewelyn Howell, of Taibach, Glamorganshire, for an
Invention of IMPROVEMENTS IN THE TREATMENT OF THE WASTE LIQUOR
PRODUCED IN PICKLING IRON,
PROVISIONAL SPECIFICATION left by the said Llewelyn Howell at the
Office of the Commissioners of Patents on the 15th February 1883.
LLEWELYN HOWELL, of Taibach, Glamorganshire, "IMPROVEMENTS IN THE
TREATMENT OF THE WASTE LIQUOR PRODUCED IN PICKLING IRON,"
My invention consists in utilizing the waste liquor produced in pickling iron.
I propose to run the waste liquor from the pickling trough to an evaporating pan
or pans, and there evaporate it until the residue is of a syrupy consistency or to
dryness. And in the case the waste liquor of hydro-chloric acid I pass it into a
suitable muffled furnace and subject it to a red heat by which the acid is expelled
from the compound (or base), leaving a residue of ferric oxide. The gas from the
muffled furnace is conducted to a condensing tower or other suitable condenser
and brought into contact with water, or the condensed solution of the evaporating
pan or pans, by which it is absorbed and forms hydro-chloric acid and is again ready
for use in pickling troughs-for treating iron or steel.
I propose to fix a condensing apparatus to the evaporating pan or pans in order
to condense the vapours arising which contain a quantity of hydro-chloric acid gas
and to use the resultant solution with or without the addition of steam in the
furnace to condense the gas from the furnace. The whole process from the
beginning of the evaporation until the whole of the hydro-chloric acid gas is
expelled and nothing remains but the ferric oxide, may be performed in the
vaporating pan or furnace or other suitable evaporating apparatus, but I prefer
o carry out the process as described above as being more economical and effective.
also propose to add a quantity of Sodium chloride to the waste liquor in the
vaporating pan or to the compound in the muffled furnace in order to make up for
he loss of acid which takes place in the process of pickling. The whole of the
vaste liquor may be simply evaporated to dryness and the residue made use of
vithout further treatment.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Llewelyn Howell in the Great Seal Patent Office on the 15th August
1883.
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LLEWELYN HOWELL, of Taibach, Glamorganshire, IMPROVEMENTS IN THE
TREATMENT OF THE WASTE LIQUOR PRODUCED IN PICKLING IRON,
My invention consists in utilizing the waste liquor produced in pickling iron.
I propose to run the waste liquor from the pickling trough to an evaporating pan
or pans, and there evaporate it and at the same time carefully skimming off the
surface matters formed until the residue is of a syrupy consistency or is dry. And
in the case of the waste liquor of hydro-chloric acid I pass it into a suitable muffled
furnace with or without steam or vapour of water and subject it to a red heat by
which the acid is expelled from the compound (or base), leaving a residue of ferric
oxide. If steam is not used in the furnace the resultant liquor is to be exposed to-
light. I add a quantity of Sodium chloride to the waste liquor in the evaporating
pan, or to the compound in the muffled furnace The gas from the muffled furnace
is conducted to a condensing tower or other suitable condenser and brought into
contact with water, or the condensed solution of the evaporating pan or paus, by
which it is absorbed and forms hydro-chloric acid and is again ready for use in
pickling troughs for treating iron or steel.
I propose to fix a condensing apparatus to the evaporating pan or pans in order
to condense the vapours arising which contain a quantity of hydro-chloric acid-gas
and to use the resultant solution with or without the addition of steam in the
furnace to condense the gas from the furnace. The whole process from the
beginning of the evaporation until the whole of the hydro-chloric acid gas is
expelled and nothing remains but the ferric oxide, may be performed in the
evaporating pan or furnace or other suitable evaporating apparatus, but I prefer to
carry out the process as described above as being more economical and effective.
In witness whereof I the said Llewelyn Howell have hereunto set my hand and
seal this 14th day of August A.D. 1883.
TT TWIN HOWELL. 170)