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Патент USA US2133327

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‘Patented 0a." 18, 1938 ' V
2,133,327
‘UNITED STATES2,133,327PATENT OFFICE ,
PROCESS FOR REFINING LEAD'WHICH CON
,~
'
TAINS BISMUTH
'
Leon Eugene Jollivet, Marseille L’Estaque, France,
‘minor to Société Miniere ct Métallurgique de
Penarroya, Paris, France, a corporation ofv
- France
No Drawing. Application ‘November _30, 1937, Se
'
rial No. 177,301.
In France January 11, 1937
7 Claims. (01. 75-63)
The present invention relates to a \process for
re?ning lead which contains bismuth allowing the
whole of the bismuth to be extracted therefrom.
This process is based upon the simultaneous
action of magnesium and potassium which action
was the more incapable of being predicted since
potassium alone does not produce any elimina
tion of bismuth and magnesium alone only pro
the greater part of its other impurities before ap~
plying the process of the invention for the re
moval of bismuth.
I
The-invention is illustrated in the following
non-limiting examples.
Example 1
A lead‘ containing 1350 grams of bismuth per
duces a partial elimination of bismuth in alloys v metric ton is treated in the fused state with an
addition of magnesium equal to 1520 grams per 10
-,
10 containing a high contentthereof.
The process which forms the subject of the metric ton and an addition oil/potassium equal to
present invention thus consists essentially in add
975 grams per metric ton. After agitation and
ing to lead which contains bismuth and which has cooling to the neighbourhood of the temperature
been previously molten, magnesium and potas
of solidi?cation, the ?oating crust is separated.
sium in suitable quantities and then allowing the
The lead obtained only‘ contains 130 grams of 15
metal bath to cool' to near its temperature of
solidi'lcation.
~
#
'
bismuthl‘per metric ton.
'
;
There is thus formed'a ?oating crust contain
ing bismuth, magnesium, potassium and lead and
v
I
Example
2
'
-
A lead containing 590 grams of bismuth pe
20 which is separated from the bath of metal by any ' metric ton is treated as above with an addition 20
'
known process.
I
'
'
This ?oating crust will contain, according to
the proportions of magnesium and potassium
used, the desired part of the bismuth contained,
25 and up to the whole of the bismuth content, the
bismuth content of the fused metallic lead being
thus able practically to be brought to, 0.001%.
After this treatment the lead always vcontains
an excess of magnesium and potassium from
30 \ which it can be freed by any known treatment for
of magnesium equal to 2220 grams per metric
ton and an addition of potassium equal to 1240
grams per metric ton. After, cooling and separa
tion of the'?oating crust the lead obtained only
contains'14 grams of bismuth per metric ton.
What I claim is:
25
'
'1. Process for re?ning .lead which contains
bismuth, consisting in adding to the lead in‘ the
molten state magnesium and potassium, cooling
the metallic bath to the neighbourhood of its 30
example with chlorine or water vapour. ,.
solidi?cation point and‘ then separating there
For putting the process according to the in
vention into e?ect, the magnesium and potassium
collected.
may be employed in the state of pure metals or of
35 valloys with lead or with other metals, and be add- '
from the ?oating crust in which the bismuth has
_
2. Process for re?ning H lead ‘which contains
bismuth, consisting in adding simultaneously to
ed successively or simulteously to the bath of
the lead in the molten state magnesium and
impure metal to be trea 1'? .
potassium, cooling the metallic bath ,to ‘ the
_
v
If desired the proportion of magnesium or
potassium utilized maybe diminished and this
40 diminution be compensatedby an increase of
neighbourhood of its solidi?cation point and then
separating therefrom the ?oating crust in which
the bismuth has collected.
,
‘
'
40
potassium or magnesium taking care always to
3. Process for re?ning lead which contains bis
provide a simultaneous or successive addition of
potassiumand magnesium; one may thus in par
muth, consisting in adding successively in either‘
ticular confer upon the refining process ad
mum cost of the reagents employed, greater ease
nesium and potassium, cooling the metallic bath
to the neighbourhood of its soli'd?cation point and 45
then separating therefrom the floating crust in
in the treatment of the dresses, etc.’
which the bismuth has collected.
45 ditional advantages such for example as mini
‘
'
It should be noted that if thelead from which
the bismuth isto be removed contains, besides
50 bismuth, other impurities these may be partly or
wholly contained .in the dross with the bismuth.
However as at present there are e?icacious
means for the separation of ‘these other current
impurities from impure lead, it may be more
55 economical to separate from the lead to be treated
sequence to the lead in the molten state mag
7
4. Process for re?ning lead which contains
bismuth, consisting in adding to the lead in the
molten state magnesium and potassium. in the 50
state of alloys with lead, cooling the metallic bath
to the neighbourhood of its solidi?cation point
and then separating therefrom the ?oating crust
in which the bismuth has collected.
5. Process for re?ning lead which contains 55
2
2,133,827
bismuth, consisting in adding to the lead in the
molten state magnesium and potassium in the
state of alloys with other metals, cooling the
metallic bath to theneighbourhood of its solidi?
cation point and then separating therefrom the
?oating crust in which the bismuth has collected.
6. Process for re?ning lead which contains
bismuth consisting in adding to the lead in the
molten state magnesium and potassium, cooling
10 the/metallic bath to the neighbourhood of its
1 solidi?cation point, and then separating there
from the ?oating crustin which the bismuth has
collected, the proportions of magnesium and
potassium being coordinated in the sense that the
proportion of one may be varied within certain
limits, this variation being compensated by a
corresponding variation in the opposite sense in
the proportion of the other.
‘
r
‘7. Process for re?ning lead which contains
bismuth, consisting in bringing to simultaneous
action on the lead in molten state magnesium
and potassium, cooling the metallic bath to the
neighbourhood of its solidi?cation point and then
separating therefrom the ?oating crust in which
the bismuth has'collected.
LEON EUGENE JOLLIVET.
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