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Method for producing ductile cast iron by taking iron slag taken out by molten iron when pretreating slag skimming as material

A technology of molten iron pretreatment and ductile iron, applied in the field of metallurgy to achieve the effect of reducing energy consumption

Inactive Publication Date: 2010-08-25
INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the existing production method, the present invention provides a method for producing nodular cast iron by using the slag and iron taken out by pretreatment of molten iron as raw material

Method used

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  • Method for producing ductile cast iron by taking iron slag taken out by molten iron when pretreating slag skimming as material
  • Method for producing ductile cast iron by taking iron slag taken out by molten iron when pretreating slag skimming as material
  • Method for producing ductile cast iron by taking iron slag taken out by molten iron when pretreating slag skimming as material

Examples

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Effect test

example 1

[0018] Use this method to produce 1t of ductile iron with the designation QT500-7. The melting equipment adopts 450kVA, 1.5t industrial frequency induction furnace. The iron slag is smelted in an induction furnace. The composition of the iron slag used is C: 3.5%, Si: 0.8%, Mn: 0.35%, S: 0.033%, P: 0.03%, Mg: 0.025%, and the balance For Fe. The melting temperature is 1550°C, and the melting time is 40 minutes. 15kgCaC 2 Put it into the bottom of the ladle with 17kg75SiFe at the same time and wait for the molten iron to rush in. After pouring into molten iron, inoculation and desulfurization treatment are carried out. The treatment temperature is 1430°C and the treatment time is 10 minutes. After the inoculation treatment, the wire feeding method is used for spheroidization treatment. The wire feeding equipment is a single-head wire feeding machine, the nodulizer is QRMg8RE3, the core wire diameter is 10mm, the wire quality is 169g / m, and the wire feeding speed is 100m / min ...

example 2

[0020] Use this method to produce 1t of ductile iron with the brand name QT400-15. The melting equipment adopts 450kVA, 1.5t industrial frequency induction furnace. The slag iron is smelted in an induction furnace, and the composition of the slag iron used is C: 2.8%, Si: 0.5%, Mn: 0.45%, S: 0.023%, P: 0.04%, Mg: 0.03%, and the balance For Fe. The melting temperature is 1530°C, and the melting time is 30 minutes. 12kgCaC 2 Put it and 25kg75SiFe into the bottom of the ladle at the same time and wait for the molten iron to rush in. After pouring into molten iron, inoculation and desulfurization treatment are carried out. The treatment temperature is 1400°C and the treatment time is 8 minutes. After the inoculation treatment, the wire feeding method is used for spheroidization treatment. The wire feeding equipment is a single-head wire feeding machine, the nodulizer is QRMg8RE3, the core wire diameter is 12mm, the wire quality is 172g / m, and the wire feeding speed is 120m / min...

example 3

[0022] Use this method to produce 1t of ductile iron with the designation QT700-2. The melting equipment adopts 450kVA, 1.5t industrial frequency induction furnace. The iron slag is smelted in an induction furnace, and the composition of the iron slag used is C: 3.0%, Si: 0.9%, Mn: 0.5%, S: 0.019%, P: 0.03%, Mg: 0.022%, and the balance For Fe. The melting temperature is 1500°C, and the melting time is 40 minutes. 7kgCaC 2 Put it into the bottom of the ladle with 16kg75SiFe at the same time and wait for the molten iron to rush in. After pouring into molten iron, inoculation and desulfurization treatment are carried out. The treatment temperature is 1400°C and the treatment time is 15 minutes. After the inoculation treatment, wire feeding method is used for spheroidization treatment. The wire feeding equipment is a single-head wire feeding machine, the nodulizer is QRMg8RE3, the core wire diameter is 13mm, the wire quality is 230g / m, and the wire feeding speed is 100m / min ,...

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Abstract

The invention relates to a method for producing a ductile cast iron by taking iron slag taken out by molten iron when pretreating a slag skimming as material, which comprises the steps as follows: (1) iron slag is melted in an induction furnace, the smelting temperature ranges from 1500 to 1550 DEG C, and the smelting time is 30 to 60 minutes; (2) CaC2 and 75SiFe are added in a foundry ladle, wherein, CaC2 is 0.7 to 1.8 percent of the original molten iron quantity, and 75SiFe is 1.0 to 2.5 percent of the original molten iron quantity; then molten iron is poured into the foundry ladle for desulfurization treatment and inoculation treatment, the treatment temperature ranges from 1400 to 1450 DEG C, and the time is 8 to 15 minutes; (3) globularizing is performed in a wire feeding manner, a core wire is fed when the desulfurization treatment and the inoculation treatment are about to be completed, and the addition quantity of a nodulizing agent is regulated according to the original molten iron component; and (4) the molten iron which is processed through the globularizing is cast to obtain the ductile cast iron, and the casting temperature ranges from 1350 to 1370 DEG C. The method provides a new approach for producing the ductile cast iron, makes the best use of metallurgical scraps, produces the ductile cast iron through simple working procedures by utilizing the advantage of higher Mg content, and has great significance to recycle waste materials and reduce energy consumption.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for producing nodular cast iron by using the slag and iron taken out by pretreatment of molten iron as raw material. Background technique [0002] Ductile iron has high strength and good toughness, and its mechanical properties are almost close to steel. Therefore, its application range is expanding day by day, and its output is increasing. Metal structural materials. [0003] At present, the production of ductile iron parts at home and abroad mainly uses cast pig iron plus scrap steel and an appropriate amount of ferrosilicon as raw materials. After secondary smelting in cupola or electric furnace, nodularization and inoculation are carried out by punching method to obtain nodular cast iron. This method of production has the following disadvantages: one is that the price of raw materials (pig iron) is higher, and the other is that the composition is unstable. The ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C21C1/10C21C7/04C21C7/06C22C37/10
Inventor 孙中强沈卓
Owner INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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