Smelting method for producing high-silicon low-carbon manganese-copper alloy at a time through submerged arc furnace

Abstract

The invention belongs to the technical field of ferroalloy preparation and particularly relates to a smelting method for producing high-silicon low-carbon manganese-copper alloy at a time through a submerged arc furnace. Raw materials comprise manganese ore, extra silicon, a copper raw material, dolomite and fluorite, and are continuously added into the submerged arc furnace to be heated till being molten, the molten liquid alloy is injected into a double-step ladle for standing for 5-10 minutes, then deslagging is carried out, and after slagging-off treatment is carried out, the liquid alloy in the ladle is subjected to ladle-to-ladle casting so that the high-silicon low-carbon manganese-copper alloy can be obtained; and the obtained high-silicon low-carbon manganese-copper alloy comprises 55-63% of Mn, 20-25% of Si, 5-8% of Cu, 0.5-2.5% of P, 0.02-0.05% of S and 5-10% of Fe. The technological method is simple, convenient to implement, low in energy consumption and capable of saving electric energy, meanwhile, the electrode insertion depth can be controlled, the surface temperature of the submerged arc furnace is decreased, and the production cost is reduced.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of ferroalloy preparation, and in particular relates to a smelting method for producing high-silicon and low-carbon manganese-copper alloy with a one-time submerged arc furnace. [0003] Background technique: [0004] At present, the silicon in the silicon-manganese alloy generally can only reach about 20%, carbon about 2%, and sulfur 0.04%-0.06% without special processing. In addition, manganese ore has a large amount of manganese loss and high carbon content, so carbon reduction treatment is required in the later stage. If the silicon in the silicon-manganese alloy is increased to a content of 25%-31%, the carbon in the alloy will naturally be reduced to 0.1%-0.2%. In this process, the amount of coke used to increase the temperature in the furnace must be increased to 28%-32%, thus causing the electrode to lift up, the surface temperature of the submerged arc furnace is too high, the temperature of...

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Problems solved by technology

If the silicon in the silicon-manganese alloy is increased to a content of 25%-31%, the carbon in the alloy will naturally be reduced to 0.1%-0.2%. In this process, the amount of coke used to increase the temperature in the furnace must be increased to 28%-32%, thus causing the electrode to lift up, the surface temperature of the submerged arc furnace is too high, the temperature of the bottom of the furnace is lowered, and the bottom of the furnace rises, which affects the normal smelting and increases the cost. It is difficult for workers to operate the furnace at high temperature, and the carbon consumption is high. unstable

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