Year: 1888

page_text: Date of Application, 18th Jan., 1888
Complete Specification Left, 17th Oct., 1888
Complete Specification Accepted, 23rd Nov.. 1888
I MICHAEL NICHOLAS D'ANDRIA of West Egerton Street Salford in the county of
Lancaster Chemical Manufacturer, do hereby declare the nature of this invention to be
as follows:-
The object of my invention is to recover tin from tinned metal such as scrap or refuse
tinned iron.
My process consists in dipping the tinned iron in a bath of chloride of zinc.
heated to a temperature suitable for readily dissolving the tin from the surface of the
iron.
The heated iron is afterwards washed in water and the chloride of zinc adhering
thereto dissolved and recovered.
The reduced activity of the chloride of zinc. in dissolving tin is revivified from
time to time by adding acid chloride of zinc to the said bath.
When the bot bath of zinc chloride contains a sufficient quantity of tin, I dissolve
the said chlorides of zinc and tin in water and precipitate the tin in metallic condition
by means of metallic zinc placed in the said solution.
After the separation of the tin, I concentrate the solution of chloride of zinc and...
again use it for dissolving tin as above set forth.
Dated this 17th day of January 1888

page_text: COMPLETE SPECIFICATION.
Improvements. in Recovering Tin from: Tinned Metal.
I MICHAEL NICHOLAS D'ANDRIA of West Egerton Street Salford 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 :--
The object of my invention is to recover tin from tinned metal such as scrap or
refuse tinned iron.
My process consists in dipping the tinned iron in a bath of chlorido of zinc heated
to a temperature suitable for readily dissolving the tin from the surface of the iron.
This I find to be easily accomplished when the chloride of zinc is heated to any
convenient temperature above the melting point of the chloride of zinc.
The heated iron is afterwards washed in water and the chloride of zinc adhering
thereto dissolved.' The thin pieces of sheet iron may be heated by a non oxidizing
flame in a suitable furnace and hammered together to form thick pieces of iron to be
used for any suitable purpose.
The reduced activity of the chloride of zinc in dissolving tin is revived from time
to time by adding acid chloride of zinc (or its equivalent liquid hydrochloric acid
passed underneath the surface of the bath of chloride of zinc) to the said bath.
When the hot bath of chloride of zinc contains a sufficient quantity of tin I
dissolve the said chlorides of zinc and tin in water and precipitate tlie tin in metallic
condition by means of metallic zinc placed in the same solution to which a small
quantity of hydrochloric acid has by preference previously been added.
After separation of the tin I concentrate the solution of chloride of zinc and again
use it for dissolving tin as set forth, after being revived by addition of acid chloride
of zinc or equivalent acid.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
2.
First. Treating tinned iron for removal and recovery of tin therefrom in a bath of
hot chloride of zinc and reusing the said chloride of zinc substantially as set forth.
Second. Precipitation of metallic tin by means of metallic zinc from solutions of
chlorides of zinc and tin obtained substantially as described.
Dated this 16th day of October 1888.