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Патент USA US2135189

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52,135,189
~Patented Nov. 1,
UNITED ‘STATES PATENT OFFICE
2,135,189
. PROCESS FOR PRODUCING MOLYBDENUM
.
ALLOYS
.
Arthur Linz, New-York, N. Y., assignor to Climax
Molybdenum Company, New York, N. Y., a cor
poration of Delaware
No Drawing.’ Application April 28, 1937,
»
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Serial No. 139,504
3 Claims.- (Cl. 15-133)
The mechanical mixture of the . moybdenum
oxide and lime, or other volatilization-prevent-"
The present invention relates to‘ a novel and
- improved process of producing molybdenum con
taining alloy, and more particularly to the pro
duction of molybdenum containing ferrous alloys.
ing oxide when added to thecharge, ?rst com- »
bines to form the‘ corresponding molybdate which
- Objects and advantages of the invention will
then reacts and dissolves in the molten metal.
be set forth in part hereinafter and in partwill
be obvious herefrom, or may be learned by prac
tice with the invention, the same being realized
and ‘attained by means of the instrumentalities
10 and combinations pointed out in the appended
Preferably, ‘the mixture comprises the stoichio
metrical quantities 'of the substances although
where an excess of slag is not objectionable, an
excess of lime maybe employed.
A substantially complete list of ‘the various ox 1
ides and carbonates which may be employed in
claims.
combinationwith the molybdenum oxide includes
The invention consists’ in the novel composi
the-alkaline earth oxides (magnesium, calcium,
tions, steps, combinations and improvements
barium and strontium oxides), cupric oxide
-' herein shown and described.
It has heretofore been customary to' introduce ‘ .(CuO), beryllium oxide, lead oxide (PbO), ceric 15
oxide '(CeOz) and ferrous oxide (FeO) and the‘
molybdenum into a ferrous alloy by the addition
of ferro-rmolybdenum to the molten steel or other
metal, or by the addition of calcium molybdate,
or a similar salt of a molybdenum acid, to the
20 molten metal or furnacecharge, and ‘this pro
corresponding
carbonates.
-'
'
v
It is‘ also‘possible to use certain natural min-~v
erals in place of the lime, etc.; and natural fer
rous carbonate, siderite, spathic iron or chaly 20
cedure has been followed for blast furnace 'prac- ' bite may be used. Also certain silicides such as
tice as well as with electric furnaces and other barium or calcium silicide may be used.
Having thus described this invention in con
melting processes. Lower calcium salts of molyb
' dic acid have also been employed, and othersalts -' nection with illustrative embodiments thereof,
25 of molybdicyacid have been used successively, to the details of which I do not desire to be lim 25
but for economical production calcium molybdate ited, what is claimed as new and what is desired
has been favored. All of these processes are to secure by Letters Patent is set forth in the
\ characterized by the ,use of a less volatile form
,
of molybdenum than~the oxide and the usual
30 process involves the preparation'of molybdenum _
trioxide ‘from molybdenite, and the conversion
of the oxide into the salt by roasting or wetting
the oxide and calciumoxide.~
'
According to the present invention, the molyb
35 denum trioxide is not converted into a molybdate
appended claims.
.
\WhatI claim is:—\
_
,
*1. A process of producing molybdenum con 80
taining ferrous alloys which includes adding to
the metal to ‘be alloyed a mechanical mixture of
.a molybdenumoxide and an oxide which prevents
’volatilization of the molybdenum oxide, and'heat
ing to reduce the molybdenum.
_
-
before use, but is merely mechanically mixed ‘ 2. A process of producing molybdenum con
with_,an oxide or oxide producing salt and this taining ferrous alloys which includes adding to
mechanicalmixture is added to the blast‘furnace, the metal to be alloyed a mechanical mixture
‘ electric furnace or other apparatus ,by which
40 the ferrous metal is ‘to be melted. ~Thereby is
o_ a molybdenum oxide and a substance selected
from the group consisting of magnesium, cal 40
cium, barium, strontium, cupric; beryllium, lead,
vavoided the separate and distinct stepof roast
mg or otherwise reacting the molybdenum oxide 'cericand ferrous oxides ‘and carbonates, and
with the ?xative calcium or other oxide and a .heating to reduce the molybdenum and recover
.
-co_rresponding economy is effected without any ' it in the metal.
I
3. A process of producing molybdenum con
45 countervailing defect. By the process of the
present invention, the recovery of the molyb‘denum is at leastas great in the alloy as wit
calcium molybdate.
.
l
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According to extended tests of the present in
0 vention, recovery of the molybdenum is nearly
-quantitative or 100 per cent.
.
x
4.5
taining ferrous alloys which includes adding to
the metal, to be alloyed a mechanical mixture
’ of a‘ molybdenum oxide and an alkaline earth
oxide and recovering the molybdenum by heating
the metal-and mixture.
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