The blast furnace smelting low-silico-manganese iron an important technological advances in the production of high-carbon ferromanganese. On this technology, from both theoretical and practical aspects are described. 
 The reduction mechanism. According to relevant studies in recent years, silicon in the blast furnace to restore order step by step in accordance with the SiO2 → of SiO → Si. Silicon restore the process of entering the pig iron in blast furnace is dripping with, and SiO gas as an intermediary to restore the SiO2 in the ash transferred to molten iron outlet before the release of coke combustion to enter the slag, but basically was a free state, activity and large, good contact with the coke, the reaction (1) so easy, so easy to (SiO2) into the gaseous state of SiO. Gaseous SiO in molten iron dripping with volatile rise and decline in contact with the molten iron in the [C] to restore and into pig iron. Therefore, at the outlet of the high temperature zone and dripping with reaction (1), (2) the thermodynamic conditions and kinetic conditions are favorable, that the outlet plane growth process of silicon. Below the outlet plane due to reaction (3), (4), leaving the restored into the pig iron of [Si] Reoxidize showing a drop of silicon. The reduction process of this series has been confirmed for the blast furnace anatomy at home and abroad, and production practice. 
 Due to the oxidation off the Si role of ferromanganese in the blast furnace slag (MnO) content (FeO) content is much higher, obviously (MnO) than the (FeO), this is pig iron blast furnace significantly different. 
 Raw material and fuel conditions were stable: the fine material is the material basis of the blast furnace smelting, ferromanganese silicon content level is closely related to the level of concentrate. This is because the general volume of ferromanganese blast furnace (≤ 100m3 of the average volume, maximum volume ≤ 400m3), reserve less heat, lower silicon operating hearth heat even more tense, extremely sensitive to changes in external conditions, hearth volatile cause disorders. If you are using the original fuel composition fluctuations, furnace cooling of blast furnace operation risk. In order to prevent the furnace cooling, the operator is often forced to adopt a light load of the low air temperature, leaving more room for the unexpected, but ferromanganese silicon content is difficult to reduce. 
 Operating levels of management: smelting low-silicon high-carbon ferromanganese hearth Heat reserve in the furnace conditions allowed hot critical state for a long time, to withstand the volatility can not afford to furnace conditions. Anterograde destruction of the hearth to pay a huge calorie expenditure in the short term, is bound to bring such as a cold furnace, hearth freeze, the continuity of quality accidents serious consequences. Moreover, the low silicon in heavy coke load operation of blast furnace, anterograde destruction, due to its inertia, the need for thermal compensation, to restore to normal anterograde steady state, must pay higher than the light coke load The silicon content to operate a higher price. Clearly, the low level of operations management, mistakes, it is difficult to smelting low-silico-manganese iron. 
 Device Manager: "We must first For low-smelting silicon carbon ferromanganese, equipment management is another important prerequisite. Imagine if the equipment failure is frequent, unplanned break wind more often for a long time, then even the normal production can not hold more of the smelting of low-silico-manganese iron. 
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