High carbon ferromanganese can be divided into electric […]
High carbon ferromanganese can be divided into electric furnace high carbon ferromanganese and blast furnace high carbon ferromanganese according to different processing techniques. Among them, the electric furnace high carbon ferromanganese is mainly used as a deoxidizing agent, a desulfurizing agent and an alloy additive in the steelmaking process. Today's high-carbon ferromanganese suppliers take you to understand the three electric furnace methods used by high-iron ferromanganese manufacturers.
1. The solvent method is a method for smelting high-carbon ferromanganese. In addition to manganese ore and coke in the composition of the furnace charge, there are also lime and smelting using high-basicity slag to operate the alkalinity, B = 1.3-1.4, using sufficient reduction Agent to minimize the manganese content in the waste residue and improve the recovery rate of manganese.
2. Flux-free method. For the manganese-rich ore containing high manganese oxide, the flux-free method can be used to smelt ferromanganese. Lime is not added to the furnace charge during smelting. The equipment and operation are similar to ferrosilicon, and it is used under the condition of insufficient reducing agent. For acid slag operation, the furnace temperature is about 1320-1400 ℃ lower than that of the flux method. The production of this method requires not only qualified high-carbon ferromanganese, but also low-phosphorus, low Iron-rich manganese slag. The solvent-free smelting process of high-carbon ferromanganese is continuous. The furnace charge is continuously added to the furnace during the melting process. The batch can be composed of 300 kg of manganese ore, 60 to 70 kg of coke, and 15 to 20 kg of steel scrap. When solvent-free smelting, the unit power consumption of the product is very low, and low-silicon high-carbon ferromanganese is easy to produce, because most of the silicon is concentrated in the slag.
3. The low-solvent method uses the so-called "weak acid residue method" between the solvent method and the solventless method. The method is to add an appropriate amount of lime or limestone to the furnace charge, and control the ratio of the basicity m (CaO) / m (SiO2) or m (CaO + MgO) / m (SiO20) of the slag between 0.6-0.8, thereby It can not only improve the recovery rate of manganese, but also obtain slag containing 25% ~ 30% of manganese and appropriate amount of CaO. Mixing this slag into the charge of smelting silicon-manganese alloy can save lime and reduce lime deliquescence. Increased amount of charge dust, thereby improving the permeability of the charge.