Shaking ladle premelting process for producing medium and low carbon ferromanganese

Abstract

The invention relates to a shaking ladle premelting process for producing medium and low carbon ferromanganese. Medium manganese pre-shaking slag with alkalinity of 1.2-1.3 and MnO content of 20-25% and liquid silicomanganese are mixed according to the weight ratio of 1.0:1-1.2:1, and the mixture is loaded into a shaking ladle. The capacity of the ladle is 15 m<3>, a desilication reaction is carried out in the shaking ladle, the revolution of the shaking ladle is 40-60 RPM, and the shaking smelting time is 15-20 min. The invention has the advantages that one shaking ladle is big enough to match a 5000 kVA electric refining furnace to produce because the capacity of the shaking ladle is enlarged, the production capability of the 5000 kVA electric refining furnace is fully exerted, the heat loss is small, and the desilication rate is high. By reasonably controlling the revolution of the shaking ladle and the shaking smelting time, an optimal desilication effect can be achieved, the consumption of secondary refining ore is reduced, the smelting time is shortened, manganese element in slag can be recovered to the maximum extent, and the production cost of medium manganese alloy is reduced.

Description

technical field [0001] The invention relates to a shake-bale pre-smelting process for producing medium and low-carbon ferromanganese. Background technique [0002] In the production of medium and low-carbon ferromanganese, the shaking bag method is widely used in China for shaking desiliconization, that is, shaking bag pre-smelting-electric silicon heating method. The specific process is: first pour the medium manganese slag into the shaking ladle, and then mix it into the liquid manganese-silicon alloy produced by the submerged arc furnace for desiliconization by shaking. After smelting, remove the scum on the alloy and put it into a 5000KVA medium manganese refining electric furnace for secondary refining to produce qualified medium and low carbon ferromanganese. [0003] For the production of medium-low and carbon ferromanganese alloys, the shaking ladle pre-smelting process can shorten the hot charging and smelting time, thereby increasing the output of medium-manganese...

AI Technical Summary

Problems solved by technology

At present, in China, 5000kVA refining electric furnaces are mostly used to cooperate with 5m 3 Shake ladles for production, and the design thermal charging capacity of the 5000kVA refining electric furnace is 15-17 tons of manganese-silicon alloy, requiring two 5m 3 Hot charging after shaken smelting results in high heat loss and lower desiliconization rate, resulting in high desiliconization pressure in the medium manganese refining electric furnace and high consumption of manganese ore