Improvements in the Treatment of Galvanizer's Flux Skimmings.
Year: 1895

page_text: Date of Application, 15th Aug., 1895
Complete Specification Left, 15th May, 1896 Accepted, 20th June, 1896
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of Galvanizer's Flux Skimmings.
We ALFRED WOLF, Doctor of Philosophy and WILLIAM STEWART BLYTHE,
Manufacturing Chemist, both of Church near Accrington in the County of
Lancaster do hereby declare the nature of this invention to be as follows :-
This invention consists in improvements in the treatment of galvanizers flux
skimmings.
The soluble portions of the skimmings are dissolved or washed out with water
and treated with an alkaline carbonate.
The precipitant, hydrated oxycarbonate of zinc is collected, and washed free
from chloride of ammonium and then treated with water and chlorine until a clear
solution of hypochlorite of zinc is obtained. This is evaporated with chloride of
potassium or chloride of sodium, in equivalent quantities, to the required con-
centration, and at the required temperature.
The chlorate of potassium or sodium is crystallized out and chloride of zinc
remains in solution.
Or the chloride of potassium or sodium may be added to the hydrated zinc
precipitant in equivalent quantities prior to the treatment with chlorine and the
subsequent concentration and crystallization of the chlorate of potassium or
sodium.
The mother liquors from which the oxycarbonate of zinc has been precipitated
is treated in the usual way well known to chemists for the recovery of the
ammonia.
1
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Treatment of Galvanizer's Flux Skimmings.
We ALFRED WOLF, Doctor of Philosophy, and WILLIAM STEWART BLYTHE,
Manufacturing Chemist, both of Church near Accrington, in the County.of
Lancaster, 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:-
This invention consists in improvements in the treatment of galvanizer's flux-
skimmings whereby we are enabled to obtain or recover therefrom certain useful
and valuable products.
Our improved treatment is as follows:
1. The flux-skimmings, being first ground, are placed in a vessel fitted with an
agitator, and then boiled with water to dissolve the soluble portion of the same.
The solution thus obtained is filtered, and the residue is washed free from soluble
salts, and the solution and washings are then freed from iron by the known
means for effecting this purpose.

page_text: The further treatment of the solution consists in decomposing the zinc ammonium
chlorides, or free zinc chloride which may be present with an excess of an alkaline
carbonate, in a vessel fitted with an agitator, the precipitated oxycarbonate of zinc
(or so called basic carbonate of zinc) is filtered off, and the liquor so obtained is
treated with an excess of lime, in a manner well-known to chemists, for the recovery
of ammonia.
2. The oxycarbonate of zinc, or neutral carbonate of zinc, mixed with a sufficient
quantity of water, to which has been added a solution of equivalent quantities of
chloride of potassium, or chloride of sodium as the case may be, must then be
heated nearly to boiling point in a vessel suitably constructed and fitted with an
agitator, and then through this mixture, chlorine gas is passed, the said mixture
being constantly agitated till the precipitate is dissolved.
The solution so obtained is filtered, evaporated to the required strength, and
then run into crystallisers; the zinc chloride remains in solution, and the chlorate
of potassium, or chlorate of sodium as the case may be, crystallises out.
3. The residue of the skimmings is treated in a manner well-known for producing
oxycarbonate of zinc, or neutral carbonate of zinc, and used for the last above
described process (No. 2).
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 :-
:―
The treatment of galvanizer's flux-skimmings in the manner herein before.
described for the production therefrom of oxycarbonate of zinc, or neutral
carbonate of zinc, from which may be obtained chlorate of potassium, or chlorate
of sodium, and chloride of zinc.
11906
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.