Improvements in Treating Liquid Acid Residues Containing Iron to Obtain Products therefrom.
Year: 1889

page_text: Date of Application, 28th Aug., 1889
Complete Specification Left, 28th May, 1890-Accepted, 28th June, 1890
PROVISIONAL SPECIFICATION.
Improvements in Treating Liquid Acid Residues Containing Iron to
Obtain Products therefrom.
I MICHEL NICHOLAS D'ANDRIA of Windsor Road Levenshulme in the County of
Lancaster Chemical Manufacturer do hereby declare the nature of this invention to
be as follows:-
My invention relates to the treatment of liquid acid residues obtained as a bye
product in cleaning iron previous to tinning, galvanizing, wire drawing or like
purposes, such liquid acid residues consist principally of a solution of free sulphuric
acid and sulphate of iron. The object is to separate the iron from solution as oxide
of iron suitable for use as pigment or otherwise and to utilize the sulphuric acid to
form sulphate of magnesium.
My invention consists in adding to the liquid acid residues magnesia or magnesia
and lime the latter preferably obtained from dolomite and mixed with water to
form milk of magnesia and lime until the acid is neutralized and the iron precipi-
tated as oxide of iron. Air is blown through the magma to further oxidise the iron,
which is afterward filtered washed and dried.
The solution of sulphate of magnesia is evaporated concentrated and crystalized
or otherwise obtained in solid form in suitable vessels.
Datad ibis 07th dov of August 1880
Per pro J. T. KING,
J. Johnson,
Agent.
COMPLETE SPECIFICATION.
Improvements in Treating Liquid Acid Residues Containing Iron to
Obtain Products therefrom.
I, MICHEL NICHOLAS D'ANDRIA, of Windsor Road, Levenshulme, in the County of
Lancaster Chemical Manufacturer, 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 :-
My invention relates to the treatment of liquid acid residues obtained as a bye
product in cleaning iron previous to tinning, galvanizing, wire drawing or like
purposes, such liquid acid residues consist principally of a solution of free sulphuric
acid and sulphate of iron. The object is to separate the iron from solution as oxide
of iron suitable for use as pigment or otherwise, and to utilize the sulphuric acid to
form sulphate of magnesium. My invention consists in adding to the liquid acid
residues magnesia or magnesia and lime, the latter preferably obtained from dolomite
and mixed with water to form milk of magnesia and lime until the acid is
neutralized and the iron precipitated as oxide of iron, air is blown through the
magma to further oxydise the iron which is afterwards filtered, washed, dried roasted
and treated in manner usually employed to obtain oxide of iron suitable for use as
pigment.
The solution of sulphate of magnesia is evaporated concentrated and crystalized or
otherwise obtained in solid form in suitable vessels.

page_text: 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 :-
:-
The treatment of residual solutions of sulphate of iron to obtain oxide of iron and
sulphate of magnesia substantially in manner and for the purpose set forth.
Dated the 27th May 1800
Per pro J. T. KING,
J. Johnson,
Agent.