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Spheroidizing method of nodular cast iron

A technology of spheroidizing treatment and spheroidizing agent, which is applied in the field of spheroidizing treatment of the flush-in-bag method, which can solve the problems of low absorption rate of effective elements and violent reaction.

Inactive Publication Date: 2013-12-11
TIANJIN WANLU LTD CO OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide an easy-to-operate nodular cast iron spheroidizing treatment method which can be carried out continuously. The chemical treatment method solves the problems of violent reaction and low absorption rate of effective elements during the spheroidization process of flushing into the bag, precisely controls the spheroidization reaction time, improves product quality, reduces production costs, is easy to operate, and fully utilizes and utilizes resources. Significantly improve the production environment of nodulizer production process and use process

Method used

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  • Spheroidizing method of nodular cast iron
  • Spheroidizing method of nodular cast iron
  • Spheroidizing method of nodular cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Carry out under cold wind cupola smelting conditions, adopt the reaction chamber structure of the spheroidizing treatment bag 1 shown in the accompanying drawing, first put the integral rare earth magnesium silicon iron spheroidizing agent without outer lining square steel pipe into the spheroidizing treatment bag Put the 72 ferrosilicon inoculant into the reaction chamber in the feeding port of the reaction chamber. The weight of each bag of molten iron is 1000kg. The red hot bag is used for continuous operation. The overall rare earth magnesium ferrosilicon nodulizer for square steel pipe without outer lining contains 14.5% of Mg, 1.3% of RE and 63.25% of Si. Accounting for 0.8% of the weight of molten iron to be processed, the amount of 72SiFe inoculant added in the reaction chamber is 0.8%, and iron filings and perlite are not covered in the bag during the spheroidizing reaction. 0.10%, the spheroidization reaction time is 2 minutes and 35 seconds, the...

Embodiment 2

[0035] Embodiment 2: carried out under the conditions of intermediate frequency electric furnace smelting, using the reaction chamber structure of the spheroidizing treatment package 1 shown in the accompanying drawing, and adopting the integral rare earth magnesium silicon iron spheroidizing agent without outer lining steel pipe to be loaded into the reaction chamber of the spheroidizing package , the weight of molten iron per package is 1000kg, the temperature of the molten iron from the electric furnace is 1588°C, the sulfur content of the original molten iron is 0.025%, and the overall rare earth magnesium silicon ferrosilicon nodulizer for square steel pipes without outer lining contains Mg14.5%, RE1% and Si58%, the weight of the rare earth magnesium silicon iron nodulizer added as a whole square steel pipe without outer lining accounts for 0.50% of the weight of the molten iron to be processed, and 0.8% 72SiFe inoculant is added in the reaction chamber, and the particle si...

Embodiment 3

[0036] Example 3: Carried out under the smelting conditions of an intermediate frequency electric furnace, using the reaction chamber structure of the spheroidizing treatment package 1 shown in the accompanying drawing, processing 917Kg of molten iron, spheroidizing treatment at 1483°C, adding no outer lining to the reaction chamber of the spheroidizing package The overall nodulizer for the square steel pipe contains Mg14%, RE1% and Si63.5%. The weight of the unlined square steel overall rare earth magnesium silicon iron nodulizer added accounts for 0.48% of the weight of the molten iron to be processed; 0.8% 72SiFe inoculant, its particle size ≤ 25mm; the total reaction time of the spheroidization reaction is 101 seconds, and it is a smokeless boiling reaction after 30 seconds of reaction. The width of the white mouth is 2-3mm, the top depression is obvious, and the absorption rate of Mg is high.

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Abstract

The invention relates to a spheroidizing method for producing nodular cast iron. According to the spheroidizing method, a melted whole rare earth ferrosilicon magnesium alloy spheroidizing agent containing not more than 20% of Mg, not more than 70% of Si and not more than 3% of RE is put into a reaction chamber built in the spheroidizing ladle and carrying out an inter-ladle pouring process, wherein the addition amount of the spheroidizing agent is only 0.4%-0.8% of the weight of the melted iron to be processed; the spheroidizing reaction time is controlled accurately, the temperature of the melted iron in the spheroidizing and pouring processes is less reduced, absorption rates of Mg, RE and Si after spheroidization are high, the addition amount of the spheroidizing agent is only one third of that of the traditional process, and thus the spheroidizing cost can be reduced by 50%; the production environment in the production and use processes of the spheroidizing agent is improved, and the product quality is improved. Compared with the traditional rare earth ferrosilicon magnesium alloy spheroidizing agent with rare earth element RE of 2-8%, the use amount of the rare-earth element RE is reduced by 50-75% by using the spheroidizing method for producing nodular cast iron for spheroidization.

Description

technical field [0001] The invention relates to a spheroidizing treatment method for the production of nodular cast iron, more specifically a spheroidizing treatment method in which a spheroidizing agent is placed in a spheroidizing reaction chamber built in a spheroidizing treatment package and carried out by flushing into the package. Background technique [0002] Rare earth magnesium ferrosilicon alloys are widely used as nodularizers in enterprises producing ductile iron castings. Rare earth magnesium ferrosilicon alloy nodulizer is currently the largest nodulizer at home and abroad, but in its traditional production process, it consumes a lot of energy, has large melting loss, and causes serious environmental pollution. Due to the low absorption rate of magnesium, the traditional nodulizer The amount added is larger. For a long time, technical personnel at home and abroad have made unremitting efforts to study the spheroidization treatment technology of the in-package ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/00C22C33/10C21C1/10
Inventor 刘年路刘昌晨
Owner TIANJIN WANLU LTD CO OF SCI & TECH
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