Improvements in Treating Residues (Seconds) from Zinc Smelting, Galvanized Iron Scrap, Flux Skimmings, and Acid Residues for the Purpose of Obtaining Products therefrom.
Year: 1892

page_text: Date of Application, 18th July, 1892
Complete Specification Left, 15th Apr., 1893-Accepted, 20th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Treating Residues (Seconds) from Zinc Smelting,
Galvanized Iron Scrap, Flux Skimmings, and Acid Residues for
the Purpose of Obtaining Products therefrom.
We ERNEST HENRY COOK, of 27 Berkeley Square. Bristol, Analytical
Chemist, and ALBERT EDWARD PETTER of 3 Moray Villas Fishponds near
Bristol, Analytical Chemist, do hereby declare the nature of this invention to be as
follows:-
Our invention consists in treating the seconds and galvanized iron scrap with the
spent acid from galvanizing and tinplate works so as to dissolve as much as
possible of the substances that can be dissolved, and at the same time to partially
or entirely neutralize the free acid. The mixture is then allowed to stand when
most of the lead separates out as chloride. The solution is then decanted and if
necessary the free acid nearly neutralized by the addition of lime. The residue is
treated with warm water which dissolves the lead chloride. The clear liquid is
then drained off and allowed to cool when the lead chloride separates out.
The flux skimmings are now heated with lime in a suitable furnace and the
ammonia thus given off passed into the solution which has been nearly neutralized.
This causes a precipitate of ferric hydrate which is allowed to settle, then collected
and roasted to form red oxide of iron. The clear liquid which is drained from the
hydrate of iron contains zinc chloride in solution together with ammonium chloride
and other substances. Lime is added to it and the mixture heated. Zinc hydrate is
thus precipitated and ammonia given off. This ammonia is passed into the
solution containing the iron with that obtained from the flux skimmings. The
precipitate containing the zinc is collected and dried and is then ready to be used
for any practicable purpose.
ERNEST H. COOK.
ALBERT E. PETTER.
COMPLETE SPECIFICATION.
Improvements in Treating Residues (Seconds) from Zinc Smelting,
Galvanized Iron Scrap, Flux Skimmings, and Acid Residues for
the Purpose of Obtaining Products therefrom.
ERNEST HENRY COOK, of The Clifton Laboratory, 27 Berkeley Square,
Bristol, Analytical Chemist and ALBERT EDWARD PETTER, of Moray Villas,
Fishponds, near Bristol Analytical Chemist, 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 :-
Our invention consists in treating the seconds and scrap iron with the spent acid
from galvanizing and tinplate works so as to dissolve as much as possible of the
substances that can be dissolved, and at the same time to partially or entirely
neutralize the free acid. The mixture is then allowed to stand when most of the
lead separates out as chloride.
After the fluid has been separated the residue is treated with warm water which
dissolves the lead chloride. The clear liquid is, then drained off and allowed to
cool when the lead chloride separates out.
The flux skimmings are now heated with lime in a suitable furnace and the
ammonia thus given off is passed into the spent acid which has been treated with

page_text: the seconds and galvanized scrap iron. This causes a precipitate of hydrate of
iron which is allowed to settle, separated from the liquid with which it is mixed and
roasted to form red oxide of iron.
The clear liquid which is drained from the hydrate of iron contains zinc chloride
in solution together with aminonium chloride and other substances. Lime is added
to it and the mixture heated. Zinc hydrate is thus precipitated and ammonia
given off. This ammonia is passed into the spent acid together with the ammonia
obtained by roasting the flux skimmings. The precipitate containing the zinc is
collected and dried.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the said is to be performed we declare that what we
claim is
First. The treatment of spent acid with seconds and galvanized scrap iron as a
means of entirely or partially neutralizing the spent acid.
Second. The treatment of seconds with spent acid for the purpose of obtaining
the whole or part of the lead, iron, and zinc which they contain.
Third. The treatment of galvanized scrap iron with spent acid and the recovery
from the liquid of the zinc and iron which it has dissolved.
Fourth. The employment of the ammonia obtained from flux skimmings for
causing a precipitation of the iron contained in spent acid.
Dated this 14th day of April 1893.
Witness to both signatures:
SAMUEL BAKER FROUDE.
ERNEST H. COOK.
ALBERT EDWARD PETTER.