Improvements in Obtaining Compounds of Cobalt from Solutions Containing the same.
Year: 1886

page_text: Date of Application, 28th Jan., 1886.
Complete Left, 28th Oct., 1886.
Complete Accepted, 28th Jan., 1887.
Sydney, New South Wales.]
Improvements in Obtaining Compounds of Cobalt from Solutions
Containing the same.
1 GEORGE PERRY of Harwell Steventon in the County of Berks Gentleman do
hereby declare the nature of this Invention :-
The Invention relates to a simple method of precipitating a pure salt or compound
of Cobalt from solutions containing Cobalt together with Nickel, Manganese and Iron
or one or more of them. It has hitherto been found difficult to precipitate the
Compounds of Cobalt in a pure state from solutions particularly from Nickel.
According to this Invention the solution is first cleared by filtration or
settling and
then is brought to the boiling point and while boiling a boiling alkaline solution
preferably of caustic soda of 8 or 10 per cent strength is added in sufficient quantity
to precipitate the Cobalt as oxide. At first the Cobalt so precipitated is a hydrated oxide
but by further and continuous boiling it becomes a basic sulphate. After the Cobalt
is precipitated if there be reason to suppose that any nickel manganese or iron has
been precipitated with it the bulk of the supernatant liquor can be poured or drawn
off and more boiling mother liquor containing Cobalt added when the nickel manganese
or iron so precipitated with the Cobalt will go again into solution and will be replaced
by Cobalt precipitated from the added liquor. From this it will be seen that freshly
precipitated hydrated oxide of Nickel will precipitate the oxide of Cobalt and return into
solution but it will only do so when the process is conducted at the boiling teinperature
and when the solution kept free from exposure to the atmosphere.
When a boiling solution of Caustic soda is added to a boiling solution containing
sulphate of Cobalt with nickel manganese and Iron or one or more of them each metal
is precipitated as a hydrated oxide in its turn, Cobalt being first precipitated but if the
precipitation be not conducted at the boiling point the Cobalt becomes mixed and
precipitated with the other metals. In purifying the precipitate (when necessary) the
liquid in which the precipitate is mixed should be boiling before being mixed with the
boiling mother liquor otherwise the impurities will not be replaced by Cobalt.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.,
Agent for the said George Perry.

page_text: improvements in Obtaining Compounds of Cobalt from Solutions
Containing the same.
I, GEORGE PERRY of Harwell, Steventon in the County of Berks Gentleman do
hereby declare the nature of this Invention which has been communicated to me from
Abroad by Michael Perry M.R.C.S. L.S.A. of Petersham, Sydney, New South Wales,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:—
The Invention relates to a simple method of precipitating a pure salt or compound of
Cobalt from solutions containing Cobalt, together with nickel, manganese and iron or
one or more of them. It has hitherto been found difficult to precipitate the compounds
of Cobalt in a pure state from solutions, particularly from nickel.
According to this Invention, the solution is first cleared by filtration or settling and
then is brought to the boiling point and while boiling a boiling alkaline solution,
preferably of Caustic Soda, of 8 or 10 per cent. strength is added in sufficient quantity
to precipitate the Cobalt as Oxide. At first, the Cobalt so precipitated is a hydrated
oxide, but by further and continuous boiling, it becomes a basic sulphate, or other salt
corresponding to the solution treated. After the Cobalt is precipitated, if there be
reason to suppose that any nickel manganese or iron has been precipitated with it, the
bulk of the supernatant liquor can be poured or drawn off and more boiling Mother
liquor containing Cobalt added when the nickel, manganese or iron, so precipitated
with the Cobalt will go again into solution and will be replaced by Cobalt precipitated
from the added liquor. From this, it will be seen that freshly precipitated hydrated
oxide of nickel will precipitate the Oxide of Cobalt and return into solution but it will
only do so when the process is conducted at the boiling temperature and when the
solution is kept free from exposure to the atmosphere.
When a boiling solution of Caustic Soda is added to a boiling solution, containing
Sulphate of Cobalt, (for example) with nickel, manganese and iron, or one or more of
them, each metal is precipitated as a hydrated Oxide in its turn, Cobalt being first
precipitated, but if the precipitation be not conducted at the boiling point, the Cobalt
becomes mixed and precipitated with the other metals. In purifying the precipitate
(when necessary) the liquid in which the precipitato is mixed should be boiling before
being mixed with the boiling mother liquor, otherwise the impurities will not be
replaced by Cobalt.
Having now particularly described and ascertained the nature of this Invention and
in what manner the same is to be performed I declare that what I claim is :-
--
The obtainment of compounds of Cobalt from solutions containing the same by
treatment as hereinbefore described.