Improvements in Treating Waste Liquor from Galvanizing Works and other similar Liquors to Obtain Ferric Chloride.
Year: 1891

page_text: Date of Application, 16'h Apr., 1891
Complete Specification Left, 16:h Jan., 1892-Accepted, 20th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Treating Waste Liquor from Galvanizing Works
and other similar Liquors to Obtain Ferric Chloride.
We JOHN WILLIAM WILSON of Manchester Corporation Health Depot Holt
Town in the County of Manchester Manager and CHARLES HENRY GARNET
HARVEY Sanitary Engineer of 29 Lorn Road Brixton in the County of London
do hereby declare the nature of this invention to be as follows:-
Our invention has for its object the treatment of waste pickle from galvanizing
works and other liquors of a similar ferrous composition, and in the apparatus
employed therefor. For this purpose we apply heat to the liquor in the manner
and in the apparatus hereafter to he explained. In carrying out our invention we
use a reverbatory blast or other suitable furnace, made of fire brick or fire tile, set
in fire clay mortar or oxyhydrate of iron. The furnace is fitted with pipes or flues
passing through the upper part of the furnace for carrying away the acid fumes to
be condensed together with the whole products of combustion and evaporation.
The furnace being heated by a jet of petroleum creosote, tar, coal or any other
suitable hydrocarbon compound in conjunction with an air blast. The waste liquor
is introduced from above through a suitable pipe or pipes passing through the roof
or sides of the furnace. The liquor is run in slowly, and gradually permentes
the material used for the furnace bottom and naturally forms a hard impervious
solid mass, capable of resisting the action of the acid liquor. When a sufficient
thickness of this crust has been formed the supply of acid liquor may be stopped
for a time so as to raise the temperature of the furnace in order to crystallise
the ferrous chloride, when caked it is then broken up and heated to a temperature
not exceeding a bright red heat, the ferrous chloride crystals in accordance with
the well known principle, on the application of heat are converted into brown
fumes of ferric chloride, steam and ferric oxide. The brown fumes of ferric
chloride together with the acid vapours and the whole of the products of evaporation
and combustion are then passed through and condensed in hydrochloric acid in
tanks or other suitable vessels, by this means the temperature of the hydrochloric
acid is raised. When the evaporation is sufficiently advanced to convert the
ferrous liquor into ferric chloride & ferric oxide, or both, a sufficient quantity of
the beforementioned ferric oxide or ferric chloride is introduced while hot into the
beforementioned heated hydrochloric acid which if necessary can be raised to
the boiling point by any suitable means in order to again dissolve the ferric oxide
or ferric chloride beforementioned and convert the whole into a super saturated
solution of ferric chloride, care being taken to have an excess of ferric oxide
present.
Any acid fumes given off by the hydrochloric acid, during the beforementioned
reaction may be condensed in a suitable vessel containing hydrochloric acid or in
ordinary condensing towers, to be re-used in the same manner as hereinbefore
described.
In cases where the air blast is not sufficient to force the products of combustion
and evaporation through the beforementioned apparatus, the draught is assisted, by a
steam jet, fan or exhauster previous to passing up a chimney shaft. In some cases
we pass the products of combustion and evaporation through an ordinary scrubber
or condenser previous to their being passed into the acid tank.
Dated this 16th day of April 1891.
JOHN WILLIAM WILSON.
CHARLES HENRY GARNET HARVEY.

page_text: COMPLETE SPECIFICATION.
Improvements in Treating Waste Liquor from Galvanizing Works
and other similar Liquors to Obtain Ferrio Chloride.
We Jons WILLIAM WILSON of the Corporation Sanitary Depot Hillhouse
Huldersfield in the County of York Manager and CHARLES HENRY GARNET
HARVEY Sanitary Engineer of 29 Lorn Road Brixton in the County of London
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 has for its object the treatment of waste pickle from galvanizing
works and other liquors of a similar ferrous composition and in the apparatus
employed therefor. For this purpose we apply heat to the liquor in the manner
and in the apparatus hereafter to be explained. In carrying out our invention we
use a reverbatory, blast or other suitable furnace; but we prefer to use a rever-
batory furnace, either muffled or open, made of fire brick or fire tile set in fire clay
mortar or oxyhydrate of iron. The furnace is fitted with pipes or flues passing
through the upper part of the furnace for carrying away the acid fumes to be
condensed; should direct heat be used together with the whole products of
evaporation and combustion. The furnace being heated, in conjunction with a hot
air blast, by a jet of petroleum, creosote or tar, coal or any other suitable hydro-
carbon compound not evolving an abnormal quantity of sulphurous acid which being
a deoxidising agent would present an insuperable difficulty in carrying out the
process. The waste liquor is introduced from above through a suitable pipe or
pipes passing through the roof or sides of the furnace. The liquor is run in slowly
and gradually permeates the material used for the furnace bottom, and naturally
forms a hard impervious solid mass, capable of resisting the action of the acid
liquor. When a sufficient thickness of this crust has been formed, the supply of
acid liquor may be stopped for a time so as to raise the temperature of the furnace,
in order to crystallise the liquid ferrous chloride, when caked it is then broken up
and heated to a temperature not exceeding a bright red heat, the ferrous chloride
crystals, on the application of heat are converted into brown fumes of ferric
chloride, steam and ferric oxide, the brown fumes of ferric chloride together with
the acid vapours and the whole of the products of evaporation or combustion or
both are then passed through and condensed in hydrochloric acid in tanks or other
suitable vessels, by this means the temperature of the hydrochloric acid is raised.
When the evaporation is sufficiently advanced to convert the ferrous liquor into
ferric chloride or ferric oxide or both, a sufficient quantity of the beforementioned
ferric oxide or ferric chloride is introduced while hot into the beforementioned
hydrochloric acid which if necessary can be raised to the boiling point by any
suitable means, in order to again dissolve the ferric oxide or ferric chloride before-
mentioned, and convert the whole into a super saturated solution of ferric chloride,
care being taken to have an excess of ferric oxide present, any acid fumes given off
by the hydrochloric acid during the beforementioned reaction, may be condensed
in a suitable vessel containing hydrochloric acid or in ordinary condensing towers
to be reused in the same manner as hereinbefore described. In the event of the hot
air Mast not being sufficient to force the products of combustion or evaporation or
hoth through the beforementioned apparatus the draught is assisted by a steam jet,
fin or exhauster previous to passing up a chimney shaft. In some cases we pass
the products of combustion or evaporation or both through an ordinary scrubber or
condenser previous to their being passed into the acid tank.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what
we claim is
1. The improvements in the treatment of waste pickle from galvanizing works

page_text: and other similar liquors for the purpose of manufacturing concentrated ferric
chloride and in the apparatus employed therefor substantially as herein set forth.
Dated this 15th day of January 1892.
JOHN WILLIAM WILSON.
CHARLES HENRY GARNET HARVEY.