A, Bohlen France and French company Ji Fuer electrical metallurgical iron alloy plant with a self-baking electrode 12000kWA production reduction furnace containing Si35%, Mn60% liquid high silicon manganese silicon alloy; other by ball milling manganese and coke powder Cooperate to prepare cold pellets, roast in a rotary kiln at 900~1000 °C, pour the burned pellets into a tilting electric furnace of 10000KWA, and melt the pellets after the pellets are completely melted. The mixture is mixed with a liquid high-silicon-silicon-silicon alloy iron ladle, repeatedly inverted with another ladle, and mixed with stirring, and an appropriate amount of lime is added to make the slag, and the finally obtained alloy is low-carbon ferromanganese. Using this method, the plant can produce 30,000 tons of low-carbon or ultra-low-carbon ferromanganese with low carbon, phosphorus and silicon each year.
Second, Udakang converter method In 1973, a ferroalloy plant in Sweden installed a 8t Uda Kang converter in its smelting workshop, and the lower part of the converter was equipped with 2500kW molten groove sensor. In the production, the liquid manganese-silicon alloy produced by the reduction furnace is firstly fed into the furnace, and the manganese ore and lime powder are sprayed into the alloy liquid by using nitrogen as a carrier. When the silicon content in the alloy is reduced to 7%, the lower content of MnO is lowered. The slag continues to be sprayed with manganese ore and lime powder. When the silicon content of the alloy is less than 1%, the molten metal is poured out, and the slag remains in the furnace, waiting for the liquid manganese-silicon alloy to continue to be smelted in the next furnace. The molten metal poured out from the converter is condensed and crushed to form a medium-low carbon ferromanganese product.
After the U-Takang converter was put into operation, it has been running smoothly. The consumption of one ton of medium-carbon ferromanganese containing Mn is 664kg of manganese-silicon alloy containing SiO20, 335kg of lime, electricity consumption of 260kWh, manganese recovery rate of 85%, utilization of silicon. The rate is above 90%.
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