Method for producing cast iron by adopting remelting furnace blowing smelting and purification, and apparatus thereof

A technology for remelting furnace and cast iron, which is applied in the field of iron and steel smelting, can solve the problems of difficulty in reducing the amount and harm of low-melting element inclusions and gases, and difficulty in removing impurities.

Inactive Publication Date: 2014-11-26
襄阳康捷飞龙机械制造有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The traditional induction furnace remelting process is based on the physical process of remelting. It is difficult to remove various impurities that exist in iron-containing raw materials and auxiliary materials and generated during the production process, and it is difficult to reduce low melting point elements, high mel

Method used

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  • Method for producing cast iron by adopting remelting furnace blowing smelting and purification, and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Gas Blowing Process of Acid Induction Furnace Oxidation

[0036]In the induction furnace, ceramic tubes, cermet tubes, and high-temperature metal tubes are used to blow gas into molten steel from the top or the furnace door, or open at the bottom, bury the blowing tube and the breathable brick that isolates the melt, and lay water circulation cooling protection The gas blowing system enables the traditional remelting induction furnace to have the function of bottom blowing gas. Oxygen is blown in from top to bottom or top blowing to oxidize some easily oxidizable elements, and the artificially added iron oxide and FeO generated by oxygen blowing are used to fully oxidize impurities, and FeO is reduced by C to produce CO gas, a large amount Floating to clean impurities. Use bottom or top blowing, blowing in N 2 , CO 2 , Ar, to eliminate harmful gases, and some of them float up to carry impurities. It can reduce the presence of iron-containing raw materia...

Embodiment 2

[0073] Example 2: Non-oxidizing Gas Blowing Process in Acid Induction Furnace

[0074] Oxygen is not blown in and iron oxides are not added. Others are the same as the oxidation blowing process, and the effect of removing impurities is lower than that of the oxidation blowing process.

[0075] 1) Furnace repair

[0076] With embodiment 1.

[0077] 2) Loading ingredients

[0078] Iron-containing raw material is packed into induction furnace, with embodiment 1. The amount of auxiliary materials added before slag removal in the charging and batching period and the melting period is 1.5-10% (W) of the total amount of iron-containing raw materials; in the charging and batching period, the auxiliary materials are mixed in the iron-containing raw materials, and the input auxiliary materials are auxiliary materials 20-50% of the total amount of feed; add the remaining auxiliary materials before slag removal in the melting period or in batches. The auxiliary materials are lime-ba...

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Abstract

The invention relates to a method for producing cast iron by adopting remelting furnace blowing smelting and purification, and an apparatus thereof. The method comprises the following steps: 1, adding an iron-containing raw material and auxiliary materials into a remelting furnace with a blowing function in a charging proportioning stage; 2, heating and slagging in a melting stage; 3, blowing a gas to the above obtained melt and making reducing slag in a blowing purification and reduction stage; and 4, carbonizing iron or graphitizing. The method aims to effectively remove impurities in the iron-containing raw material and the auxiliary materials through a blowing purification process, or/and an oxidation and reduction chemical reaction in high temperature blowing smelting, or/and a refining furnace blowing purification process and a vacuum process, substitutes physical remelting processes which cannot remove impurities through blowing smelting in traditional cast iron remelting induction furnaces in order to eliminate the harms of low melting point elements, high melting point elements, nonmetal inclusions and gases, stabilizes the product consistence, and matches with elements required by the production of various cast irons to produce the various cast irons through addition, generation and inoculation of iron carbide and various forms of basic structures of graphite required by the cast iron.

Description

technical field [0001] The invention relates to the iron and steel smelting industry, and specifically belongs to the category of producing cast iron through a smelting purification process. Background technique [0002] In 2012, the output of iron castings in China was about 35 million tons, about 3,000 iron casting enterprises, and nearly 10,000 induction furnaces. Induction furnaces are divided into industrial frequency furnaces, intermediate frequency furnaces, and high frequency furnaces according to the working frequency of electricity, alkaline furnaces and acidic furnaces according to the furnace lining, and smelting furnaces, remelting furnaces, and holding furnaces according to their uses. Smelting induction furnace refers to an electric furnace that mainly removes impurities and heats up through chemical reactions of oxidation and reduction and blowing. The equipment includes top and bottom blowing functions. Remelting induction furnace refers to an electric furn...

Claims

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Application Information

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IPC IPC(8): C21C1/08C21C7/076C21C7/072C22C33/08
CPCY02P10/20
Inventor 徐忠民卢峰万仁芳
Owner 襄阳康捷飞龙机械制造有限公司
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