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

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...

AI Technical Summary

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 melting point elements, easily oxidized elements, Quantity and hazard of inclusions and gases

The conventional way to produce high-grade cast iron is to choose iron-containing raw materials and auxiliary materials with higher purity. At present, the traditional cast iron industry has no more effective way to solve the above problems

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