Investigation of the Reactions in the Shaft Type Ferromanganese Smelting Furnace

The reactions in the shaft type Ferromanganese smelting furnace operated in stream on 24 June 1985 at Mizushima Ferro Alloy Co. were investigated by use of vertical sonde and shaft gas sampler. The results obtained are as follows ; 1) High coke ratio of high carbon ferromanganese operation is attributable to high direct reduction ratio, high amount of heat of MnO reduction, high heat loss and low blast temperature. 2) The Boudouard reaction is nearly in equilibrium in the temperature above 700°C. 3) Mn, K2O and SiO2 are enriched in fume dust and its diameter is 0.30.7 μm. 4) 1030% of fume dust generated at hearth is discharged from the top of the furnace and the rest is trapped by charged materials and circulates in the furnace. 5) Fume dust trap mainly occurs when the dust is melt in the temperature above 1 200°C.