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Method for recycling manganese element of pour exceed steel ingot

A recycling method and steel ingot technology, which is applied in the field of manganese element recovery of surplus steel ingots for steelmaking, to achieve the effects of small footprint, low investment, and reduced steelmaking costs

Active Publication Date: 2012-03-21
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the existing methods for recovering manganese elements from excess steel ingots, the present invention provides a method for recovering manganese elements from excess injected steel ingots. This method effectively recycles The manganese element in the surplus steel ingot reduces the amount of manganese alloy added in the LF furnace, and at the same time avoids the difficult problems of decarburization and dephosphorization caused by the high manganese content of the surplus steel ingot added to the electric furnace

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  • Method for recycling manganese element of pour exceed steel ingot
  • Method for recycling manganese element of pour exceed steel ingot

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Embodiment 1

[0032] In this embodiment, the nominal capacity of the EBT electric furnace, LF furnace, and VD furnace is 60 tons, and the nominal melting capacity of the intermediate frequency induction furnace is 8 tons.

[0033] The intermediate frequency induction furnace melts 7 tons of LZ50 axle steel ingots with excess injection, and the mass percentage distribution ratio of the excess ingots is:

[0034] Mn 0.75%; C 0.50; Si 0.27; P 0.007; S 0.002;

[0035] Cr 0.05; Mo 0.01; Ni 0.02; Cu 0.02;

[0036] The rest is Fe and unavoidable impurities.

[0037] The smelting variety of LF furnace is: LZ50 variety (Mn percentage content requirement: 0.70% ~ 0.80%). Before melting, add lime (CaO) and fluorite (CaF 2 ) slag material (ratio: 4:1) 60Kg, then add 7 tons of remaining steel ingots, and melt the remaining steel ingots. After the temperature reaches 1610 ° C, all of them are poured into the refining ladle of the LF furnace, together with the 52 tons of molten steel smelted in the EBT...

Embodiment 2

[0054] In this embodiment, the nominal capacity of the EBT electric furnace, LF furnace, and VD furnace is 60 tons, and the nominal melting capacity of the intermediate frequency induction furnace is 8 tons.

[0055] The intermediate frequency induction furnace melts 5 tons of Mn13 steel ingots with excess injection, and the mass percentage distribution ratio of the excess injection ingots is:

[0056] Mn 13.5%; C 1.25; Si 0.20; P 0.009; S 0.003;

[0057] Cr 0.05; Mo 0.02; Ni 0.03; Cu 0.02;

[0058] The rest is Fe and unavoidable impurities.

[0059]The smelting variety of LF furnace is: LZ50 variety (Mn percentage content requirement: 0.70%-0.80%). Before melting, add lime (CaO) and fluorite (CaF 2 ) slag material (ratio: 4:1) 40Kg, then add 5 tons of remaining steel ingots, melt the remaining steel ingots, after the temperature reaches 1500°C, pour 3 tons of refining ladles into the LF furnace (3 tons of steel tapping), same as EBT The 53 tons of molten steel smelted in t...

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Abstract

The invention relates to a method for recycling manganese element from the pour exceed steel ingot. The method is based on the existing technological process which comprises the following steps: EBT electric furnace smelting, LF furnace smelting and VD furnace smelting and die casting; an additional medium frequency induction furnace is used in the method of the invention, after molten steel is used in the pouring of the die casting working procedure, the residual molten steel is solidified to form a pour exceed steel ingot, slagging is performed in the medium frequency induction furnace, the pour exceed steel ingot is molten; and after the melting step in the medium frequency induction furnace is completed and the tapping temperature and the tapping quantity are determined, and the molten steel is poured in an LF furnace refining ladle and performs refining treatment in the LF furnace with the molten steel after the BET electric furnace smelting. The recycling method of the invention has less investment and small floor space; manganese element in the pour exceed steel ingot can be effectively recycled, the amount of the LF furnace manganese alloy is reduced, the steelmaking cost is lowered; and the difficult problems of decarburization and dephosphorization can be avoided after the pour exceed steel ingot with high manganese content is added in the electric furnace.

Description

technical field [0001] The invention relates to a method for recovering manganese element of surplus steel ingot from steelmaking. Background technique [0002] At present, EBT electric furnace + LF furnace + VD furnace (RH furnace) + die casting is a process widely used in domestic steelmaking. If the smelted varieties of LF furnace only contain C, Si, Mn, P, S elements, and other elements such as Cr, Mo, Ni, etc. are residual elements (the percentage of elements shall not exceed 0.30%), after smelting and pouring, the remaining molten steel The waste steel ingot mold is injected into the mold to solidify, and after being solidified into a steel ingot (abbreviated as the remaining ingot), the particle size is reduced by cutting and processing, and then put into the electric furnace again as a scrap steel raw material for smelting. [0003] Yet the problem that adopts this kind of technological method to bring is: the surplus steel ingot is put into the electric furnace as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/00C21C7/00
CPCY02P10/20
Inventor 杨利忠郝旭明韩杰宇李学超陈政
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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