Process for producing nodular graphite cast iron and gray cast iron with cast iron filings in cupola furnace

A technology for ductile iron and iron castings, which is applied in the field of casting to achieve the effects of easy technology mastery, rich iron scrap resources, and simple equipment

Inactive Publication Date: 2002-07-24
张德安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the above two existing technologies, cast iron shavings cannot directly enter the cupola to produce iron castings, but can only be smelted into cast iron blocks in the ironmaking furnace before entering the cupola to produce iron castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Put pure 2 tons of ductile iron scraps into the cupola, and use the cupola melting and casting technology to cast ductile iron parts. Although this embodiment is effective, the effect is the worst, which is mainly manifested in the blow-out of iron filings and severe oxidation of molten iron. If the temperature of the furnace is abnormal or even the phenomenon of freezing furnace often occurs, the quality of the molten iron will appear white. This embodiment is intended to support independent claim 1 and dependent claim 2.

Embodiment 2

[0015] Put 1.5 tons of gray cast iron scraps into the cupola, and use the cupola smelting casting technology to cast gray cast iron pieces. This embodiment can only achieve the effect of general castings that cannot be chipped. This embodiment is intended to support independent claim 1 and dependent claim 3.

Embodiment 3

[0017] Put 2.5 tons of ductile iron scraps into the cupola, and use the cupola smelting and casting technology to cast gray iron castings. Although the elements in this embodiment are stable, the blow-out and oxidation are very serious, causing certain difficulties in inoculation. This embodiment, like the second embodiment, is intended to support the independent claim 1 and the dependent claim 3.

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PUM

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Abstract

A process for producing nodular graphite iron casting and gray iron casting frame cast iron filings in cupola furnace includes mixing said cast iron filings, coagulant, antioxidizing agent, carbon increaser, flux and water together, stirring, shaping blocks, coagulating, drying and charging them into cupola furnace. Its advantage is very low cost.

Description

Technical field [0001] The invention relates to a process for producing ductile iron castings and gray iron castings by smelting cast iron scraps in a cupola, and belongs to the casting field. Background technique [0002] Background There are two main types of technology: (1) The process of using the cupola to produce ductile iron castings and gray iron castings is the process of putting the cast iron into the cupola; (2) The original recycling technology of cast iron scraps is through the recycling department The cast iron scraps are recycled to the ironmaking production unit for remelting treatment in the ironmaking furnace and smelted into cast iron blocks. From the above two existing technologies, cast iron scraps cannot directly enter the cupola to produce iron castings, but can only enter the cupola to produce cast irons after the cast iron scraps are smelted into cast iron blocks in the ironmaking furnace. Summary of the invention [0003] The technical problem to be sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C33/08
Inventor 张德安
Owner 张德安
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