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Патент USA US2134616

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~ Arthur
New York, n. 11., assignor to Climax
Molybdenum Company,‘ New
York, N. Y., a cor
1 . .poration of Delaware
No Drawing‘ Application Jan ' ‘
33 Claims.
‘ ,
, ‘‘ fful improvements in alloying molybdenum with
‘ ‘
‘ ‘18,1938,
(01.15-3) ,
, matter for the "introduction of molybdenum into
‘The present invention relates to‘ new and use
ferrous alloys, and also provides a novel and‘im- '
'nd improved molybdenum‘ addition agent“ i I ~
proved form of molybdenum trioxide.
In ‘accordance with the present invention, the,
‘have‘been, produced by the addition of molybde
the form of briquettes composed" ‘of roasted
ferrousjmetals and ‘more‘particularly' toja novel
Heretofore, molybdenum-bearing ferrous alloys‘ '‘ molybdenum ‘is added to‘thefurnace, or ladle in 5‘
molybdenite‘ concentrates or ‘ molybdenum tri-' H
num to the iron or steel either as calcium molyb
‘ ‘date, some ‘other molybdic acid salt, or as ferro» oxide intimately mixed with a relatively small
‘amount of still pitch; so as to form‘a hard, com- ‘
pact ‘mass of relatively high speci?c _ gravity. 10 '
molybdenunn However, each of these materials
‘ has its limitations and cannot be‘used universally
briquettes are suitable for the production
"for, onefreason or another. Calcium \molybdateq These
‘and other equivalent molybdic acid salts are‘ of ferrous molybdenum alloys either in the blast,
of satisfactory for the production of a .widerange of furnace, electric furnace, or by the addition of
ferrous alloysin the blast furnace as well as in ‘ the briquettes to the molten metal in the ladle.
By the use of these briquettes, molybdenum may 15
l5 ‘theladle‘; but are‘not satisfactoryfor the produc
be introduced into the ferrous alloy practically
without‘lossup to 1% molybdenum in the ?nal
alloy, and with only relatively‘ small losses of
tion of‘ a11oys,~ as in the‘ electric furnace, where
, slag is objectionable. “ Ferroémolybdenum‘is con
iderably‘ more costly‘ than {calcium ‘molybdate
molybdenum even where the alloy contains as
, and its use is generally-restricted to those alloys
, much as 15% molybdenum.
for which calcium “molybdate is] notsuited, al
Specifically, the briquettes of the present in
though,,except for the costof the material it is of ‘
‘ ventionare preferably formed from roasted mo- ‘
quite ‘general ‘application. Calcium molybdate,
.lybdeniteconcentrates, which are the technical
, pound from‘ roasted molybdenite, eitherby mix-v ‘ grade of molybdenumtrloxide and contain from
, however, requires , the, production of the com-‘
'19gto 90% ofmolybdenum trioxide. This roasted 25‘
‘ng‘a'nd heating to high temperatures, or by mix
mg, wetting jandbriquetting.
, .
molybdenite is' mixed with ,a-quantity of‘ ‘still-‘ 7
a binder for the roasted
Theprior patents ‘and literature describe other pitch whichservestheas proportions
‘are such that
processesiof producing‘molybdenum alloys which molybdenitafand
the briquettes contain-from 88 to 90% roasted
ihave‘ not come into commercial use, or are of very
30 limited commercialv application, and in‘several
of them, themolybdenum is described as being
I‘ added‘ to" the blast furnace, or to the molten
, ,, ferrousmetal, in the form of roasted molybdenite
molybdenite and from 10% to 12% ofstill-pitch. 3o
9 These briquettes are preferably cylindrical‘ and
may conveniently contain a_ predetermined'and .
uniform amount of molybdenum.v In practice, it
or molybdic, trioxide. These ‘processes have ‘is convenient for them, to have a molybdenum
“35 proved to be of. no, commercial value, due to the g content of 2.50 pounds, as this size makes for easy 35
high loss of, molybdenum through volatilization handling, and‘ these briquettes are of, sufficient
and entrainment, as molybdic trioxide ‘is a very ‘ size andweight to sink readily through the slag
or into the molten ferrous metal. The uniform
‘light powder and has a relatively low volatiliza
molybdenum content of these briquettes expedites. ‘
, q ‘ tion point.‘ Consequently, these processes will
Y, 40 produce a commercially satisfactory recovery of the addition of the ‘correct amount’ of molyb- 40
i-“molybdenum ‘only where the“ molybdenum tri
The use of pitch as a binder for the roasted
oxide, or roastedmolybdenite, is buried in the
charge. and will be“ trapped or absorbed. by the molybdenite is particularly desirable as itgener
“upper ‘layers of the charge before it escapes from ' ally contains more than 90% carbon, and the
quantity speci?ed not only‘ serves to bind ‘the 45 .
‘ ‘45 the furnace. However, when the furnace is
’ charged in thismanner, only one alloy can be, roasted concentrate ?rmly together into a hard
, produced from the ‘charge and it is generally not compact mass, but also approximately‘ provides
desired to ‘produce solarge an amount of any the correct stoichiometrical quantity of carbon
p ‘ particularmolybdenum alloy.
Where the molyb-, ‘to combine with the oxygen in the roasted con
‘5,0 'denumtrioxide or roasted molybdenite is thrown ' centrate; thereby preventing a change inthe ‘car- 50
in on top of "the‘ slag, it is generally volatillzed bcn content of the ?nal ferrous alloy. The briquettes of‘ the present invention are ex;
‘‘ before itmixes withjfthe slag] and only ‘a small
] tremely economical due to the low cost and small
‘ portion is recovered in the‘alloy.‘
, The‘present invention has for its object the amount of. the added material and also to the
55 provision of a novel and improved composition of fact that they can be manufactured simply and, 55 " “
without the elaborate equipment necessary for
the production or calcium molybdate either by
heat or by the wet process, and they provide an
inexpensive and easily used form of molybdenum
which is 01' more general application than any
01' the previously proposed or used forms.
The invention in its broader aspects is not
limited to the specific compositions described but
departures may be made therefrom within the
scope of the accompanying claims without de~
parting from the principles or the invention and
without sacri?cing its chief advantages.
What I claim is:
1. An alloying briquette comprising a solid
mass of about 90% roasted molybdenite concen
trates and about 10% pitch binder.
2. An alloying briquette comprising a solid
mass of roasted molybdenite concentrates and a
relatively small amount of pitch intimately mixed
therewith and serving as a binder. '
3. A composition of matter for use in producing
ferrous-molybdenum alloys consisting of an inti
mate mechanical mixture of roasted‘ molybdenite 10
concentrates and a relative small amount of
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