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Патент USA US2111032

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2,111,032
Patented Mar. 15, 1938
I UNITED STATES PATENT OFFICE
2,111,032
METHOD OF PURIFYING FUSED >METALS
Otto Nielsen, Ilsenbnrg at the Harz, Germany
No Drawing. Application December 20, 1934, Se
rial N02 758,476. In Germany December 20,
1933
5 Claims. (C1- ‘15-93)
The removal of certain impurities from fused
metals cannot be carried out by the known ordi:
nary purifying methods. Thus, for example, it-is
not possible economically to remove selenium
5
Having-now particularly described and ascer
tained the nature of my said invention and in
what manner the same is to be performed, I vde
clare that what I claim is:
from copper when melted. ' The puri?cation of
l. The process of purifying a fused non-ferrous
The .same applies also to other non-ferrous
selenium and tellurium, which consists in adding
metal from elements of the group consisting‘ of
copper containing selenium can be effected elec
selenium and tellurium, which consists in adding
trolytically; this process is, however, more ex
a mixture of a suitable alkali compound and a
pensive than re?ning in a furnace and is eco
nomical only with a recoverable content of noble reducing agent to the molten metal to form a 10
metal. Since it has hitherto been impossible to '- rediicing'slag, and avoiding oxidizing in?uences
10
remove selenium by re?ning in a furnace, it has while the metal to be puri?ed remains in the
been necessary to use the more expensive method . molten state and while the rnetal're'niainsv in-re
_
even with copper which is free from noble metals _ active contact with the slag.’ I
2. The process ofpurifying a fused non-ferrous
in order to remove the very detrimental impurity _ /
" metal from elements of the group consisting of 15
15 and thereby make the copper generally useful.
metals, especially‘ lead, zinc, etc.
-
>~
a mixture of a suitable alkali compound and a
reducing agent to the molten metal ‘thereby
By the new'method it is possible to remove- im ' forming
a reducing slag, and maintaining a non
purities such asselenium, tellurium etc., from ' oxidizing
atmosphere while the metal to be puri-,
fused metals in an economical manner without
?ed
remains'in
the molten ‘state and while the
electrolysis or other expensive lixivlation process.
The method consists in treating the fused metal
under non-oxidizing conditions with suitable
compoundstogether with reducing ‘agents.
It is very economical to use soda as the alkali
25
and carbon as the reducing agent but other al
kalies with other reducing agents will‘produce the
The
reactions which occur in the
0 method are verycomplicated. In the treatment
of - copper containing selenium, for example,
metal remains in reactive contact with the slag.
3. The process of purifying a fused non-ferrous
metal from elements of the group consisting of
selenium and tellurium, which consists in adding 25
a mixture of soda and carbon to the 'molten
metal thereby forming a reducing slag, and avoid:
ing oxidizing in?uences while the metal to be
puri?ed remains inthe molten state and while
the metal remains in reactive contact with the 30
slag.
'
'
4. The process of purifying a fused non-ferrous
alkali selenides and‘ selenites are formed _-which metal
from elements of the group consisting of
pass into the slag, from which'selenium ‘can be
recovered. It is necessary to ensure that there
35 is no return of the impurity which has been re
moved, by maintaining a reducing or neutral at
mosphere or ‘by avoiding oxidizing in?uences as
long as the fused metal remains'in contact with
. - the
slag.
'
.
'
The treatment of the metal bath with alkalies
and ‘reducing agents can be carried out either-by
throwing them‘on the metal .bath, by blowing in
selenium and tellurium, which consists in adding
a mixture of soda and carbon ‘to the molten metal 35
thereby forming a reducing slag, and‘maintain
ing a non-oxidizing atmospherelwhile the metal
to be puri?ed remains in the molten state and
while'the metal remains in reactive contact with
the slag.
_
-
'
.
40'
-5. The process of purifying a fused non-ferrous
metal from elements of the group consisting of
below the surface'oi the metal bath in powder selenium and tellurium, which consists infrittingv
form, by placing the treatment substances on the
'bottom of the container before pouring in‘the
together a mixture of soda and carbon to produce
a conglomerate and treating the molten'metal
metal and then‘ allowing the metal to run over ' with said. conglomerate thereby forming a re.
them, orby anyknown method forobtaining re _ ducing slag, avoiding oxidizing in?uences while
action between added substances and fused mate - the metal to'be- puri?ed remains inthe molten
i I
.
.
50
Itis very advantageous to heat a .mixture‘of ' state and while the metal remains in reactive
50
contact
with
the
slag.
sodaandmrbonuntilitformsa-frltandthento
carryoutthetreatmentinthemannerdcsciibed
,wlththis-frltted material
-
.
,
OTTO NIELSEN.
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