Introduction of ferromolybdenum smelting process

Introduction of ferromolybdenum smelting process

Molybdenum is one of the important elements of industrial steel, iron alloy, added molybdenum steel accounted for a tenth of world steel output.
The alloying additive for steel is the most important use of molybdenum. In recent years, 83% to 85% of the world's total consumption is used as a steel alloy additive.
When molybdenum is added to steel, it is usually in the form of ferromolybdenum, calcium molybdate and molybdenum compacts, especially in the form of ferromolybdenum.
Molybdenum and iron can be alloyed in any proportion. Shenha believes that the molybdenum-iron solid compound is usually MoFe (it is stable at 1180~1540 °C), Mo 2 Fe 3 (it is stable to 1480 ° C), MoFe 2 (it goes to 950 °C is stable). In the ferromolybdenum alloy, in addition to Mo, MoFe, Mo 2 Fe 3 , and MoFe 2 , the other component is Fe.
Molybdenum is a refractory metal with a melting point of 2622 ° C ± 10 ° C. The melting point of the ferromolybdenum alloy increases with the increase of the molybdenum content. The melting point of ferromolybdenum containing more than 50% molybdenum is relatively high, and the melting point of ferromolybdenum containing 60% molybdenum is about 1800 °C. Therefore, it is difficult to release molten liquid ferromolybdenum during smelting.
Ferroalloy smelting is usually a process in which metal oxides are reduced to metals, and smelting of ferromolybdenum is a reaction in which molybdenum oxide is reduced to molybdenum. The raw material is molybdenum calcine - industrial (coarse) molybdenum trioxide powder.
Among the molybdenum oxides, whether it is molybdenum trioxide or molybdenum dioxide. They can all be easily reduced to metallic molybdenum by carbon, silicon or aluminum .
The reducing agent used in the ferromolybdenum smelting may be carbon or silicon or silicon plus aluminum. The smelting methods, processes and equipment vary depending on the reducing agent used. The ferromolybdenum product standards are shown in the table below
Table ferromolybdenum quality standard
standard
grade
Content (%)
Remarks
Mo≥
W
Si
S
P
C
Cu
As
Sb
Sn
Pb
≤
China
GB3649-87
FeMo70
65~75
1.5
0.10
0.05
0.10
0.5
The largest block 10kg <1mm small 5%
FeMo60
60.0
2.0
0.10
0.05
0.15
0.5
0.04
0.04
FeMo55A
55.0
1.0
0.10
0.08
0.20
0.5
0.05
0.06
FeMo55B
55.0
1.5
0.15
0.10
0.25
1.0
0.08
0.08
American ASTMA
132-64
A
55~70
1.5
0.25
0.10
2.0~2.5
1.0
B
60.0
1.0
0.15
0.05
0.10
1.0
0.010
0.01
US Claymax 1971 standard
60.0
1.0
0.15
0.05
0.10
0.2
Former West Germany
DIN17561
FeMo70
60~75
1.0
0.10
0.10
0.10
0.5
FeMo62
58~65
2.0
0.10
0.10
0.5
1.0
Japan JISG
2307-1967
FMoH
55~65
3.0
0.20
0.10
6.0
0.5
FMoL
60~70
2.0
0.08
0.06
0.1
0.5
Former Soviet Union ROCT4759-69
¢M1
58.0
0.6
0.8
0.10
0.05
0.05
0.5
0.03
0.02
0.015
¢M2
55.0
1.0
1.5
0.15
0.10
0.10
1.5
0.05
0.05
0.050
¢M3
55.0
1.0
2.0
0.20
0.20
0.20
2.5
0.10
0.10
0.100
The other main component is mainly Fe.

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