Three electric furnace methods for producing high carbon ferromanganese
High carbon ferromanganese can be divided into electric furnace high carbon ferromanganese and blast furnace high carbon ferromanganese according to the different processing technology. Among them, electric furnace high carbon ferromanganese is mainly used as deoxidizer, desulfurizer and alloy additive in steelmaking process. Today, the high carbon ferromanganese supplier will take you to understand the three kinds of electric furnace method used by the high iron ferromanganese manufacturer.
Solvent method is a method of smelting high carbon ferromanganese. In addition to manganese ore and coke, there is also lime and smelting with high alkalinity slag operation alkalinity, B=1.3-1.4, using enough reducing agent to reduce the content of manganese in the waste slag and improve the recovery rate of manganese.
No flux method, for the rich manganese ore containing manganese oxide is higher, can use without flux method smelting ferromanganese, smelting furnace charge in not add lime, equipment and operating similar ferrosilicon, and is under the condition of insufficient reductant by acidic slag operation, the furnace temperature is about 1320-1400 ℃ lower than the flux method, in this way both to obtain qualified high carbon ferromanganese production, In addition, low phosphorus and low iron manganese rich slag with more than 35% manganese content for smelting manganese alloy should be obtained. The process of smelting high carbon ferromanganese by solvent free method is continuous. The charge is added to the furnace continuously along with the melting process. The batch can be composed of 300kg manganese ore, 60~70kg coke and 15~20kg steel chips. Solvent-free smelting, the product consumes very little power per unit, and it is easy to produce high carbon ferromanganese with low silicon because most of the silicon is concentrated in the slag.
Less solvent method, between the solvent method and solvent-free method between the so-called "weak acid residue method" to operate. The method is to add an appropriate amount of lime or limestone to the charge, the slag alkalinity m (CaO) /m (SiO2) or m (CaO+MgO) /m (SiO20) ratio control between 0.6-0.8, so as to not only improve the recovery of manganese, but also can obtain 25%~30% of manganese and an appropriate amount of CaO containing slag, By adding the slag into the smelting charge of silicon manganese alloy, the lime can be saved, and the dust content of the charge can be reduced due to the deliquesce of lime, so as to improve the air permeability of the charge.
