A Basic principle The total reaction of molybdenum oxidized roasting is: 
Reaction is a strong exothermic process
ΔH 298 = 1063kJ/mol
Since many compounds such as MoO 2 and Mo 2 S 3 are present in the Mo-SO system, the reaction is very complicated, and different reactions may occur under different conditions. Please refer to the relevant textbooks.
B Industrial Practice
The main processes and characteristics of molybdenum oxidized roasting are shown in the table:
Main Process and Characteristics of Molybdenum Oxide Roasting | |||||||
Process name | Product contains sulfur /% | 1t molybdenum standard coal consumption / kg | 铼 volatilization rate /% | Smoke rate /% | Flue gas SO 2 concentration /% | Recovery rate /% | other |
Multi-hearth furnace roasting | ≤ 0.1 | 70~90 | 40~60 | 10~20 | 0.8~3 | About 99 | Bed energy rate (calculated as molybdenum) 100kg / ( m 2 · d ) is currently the most important industrial method, the product is suitable for both steelmaking and wet processing to prepare molybdenum chemical products or molybdenum |
Fluidized furnace roasting | 2.0~2.5 (mainly SO 4 2- ) | 0 | About 90 | About 40% | 3~5 | >98 | Bed energy rate (calculated as molybdenum) 100kg / ( m 2 · d ), industrial production scale, the product is mainly used in wet chemical products |
Rotary kiln | ≤ 0.1 | 400~500 | 　 | 　 | 0.5~4 | About 98 | For industrial production, life expectancy is about 3~4 months |
Reverberatory furnace roasting | ≤ 0.1 | 2000~2200 | Can't recycle | 　 | <1 | 94~97 | For the ancient method, it is still used in China. |
Lime sintering | 　 | 　 | 98 is recovered by Ca ( ReO 4 ) 2 | 　 | 　 | 97~98 | Small-scale production, processing mines containing high |
Flash roasting | After wet treatment , <0.01 | 　 | 　 | 　 | 5~10 | 　 | High temperature volatile products contain MoO 3 98%~99.9% , no industrial production reports |
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