Steel-making method using waste pig iron as raw material

A raw material, pig iron technology, applied in the field of steelmaking with waste as raw material, can solve the problems of inability to meet low cost and high quality, underutilized iron filings, rising scrap prices, etc. The effect of shortening smelting time and reducing smelting cost

Inactive Publication Date: 2005-08-03
师尚智
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This steelmaking method not only consumes electricity, but also has very high requirements for raw materials. With the continuous reduction of resources, the following phenomena have appeared in the current raw material market: on the one hand, the price of scrap steel has risen, and pig iron resources are seriously in short supply.
On the other hand, a large amount of iron-containing waste, such as high-sulfur and high-phosphorus iron, sand-containing iron in iron ditch or slag ditch, iron filings, etc. are not fully utilized, resulting in waste of resources
As far as the existing smelting technology is concerned, when using the above-mentioned iron-containing waste, firstly, the amount of slagging is large; secondly, the smelting time is long; steel requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical composition of some raw materials is as follows:

[0032] Special pig iron: C3.43%, P0.176%, S0.336%,

[0033] 1. Put the following raw materials into the iron furnace: 240Kg coke, 1200Kg pig iron, 600Kg special pig iron, 360Kg chicken tail iron, 240Kg steelmaking pig iron, 70Kg limestone,

[0034] Smelting for 1 hour at a temperature of 1400-1500°C, the chemical composition of the obtained pig iron is:

[0035] C3.74%, P0.17%, S0.184%;

[0036] 2. Transfer 6300Kg of the above-mentioned molten iron into a semi-steel furnace, add 146Kg of lime, and smelt with oxygen blowing for 27 minutes at 1580-1650°C to obtain semi-steel, whose chemical composition is: C1.81%, P0.093%, S0 .157%;

[0037] 3. Transfer 6300Kg of the above semi-steel molten steel into the electric furnace, add 2615Kg of steel slag, 1310Kg of iron filings, and smelt at 1620-1640°C for 1.5 hours, wherein the melting period is 50 minutes, the oxidation period is 15 minutes, and the reduction ...

Embodiment 2

[0039] 1. Batch of iron furnace charge:

[0040] a: Coke 220Kg b: Coke 220Kg

[0041] Dam ash 600Kg Iron filings 500Kg

[0042] 600Kg bread iron, 200Kg nodules

[0043] Limestone 60Kg Cocktail Iron 500Kg

[0044] Limestone 60Kg

[0045] Two batches of materials a and b are fed in turn, and smelted for 2 hours at a temperature of 1400-1500 ° C, the obtained

[0046] The chemical composition of pig iron is: C3.78%, P0.081%, S0.166%;

[0047] 2. Transfer 5800Kg of the above molten iron into a semi-steel furnace, add 124Kg of limestone, and smelt it with oxygen blowing for 24 minutes at 1580-1650°C to obtain semi-steel. The chemical composition is: C1.75%, P0.053%, S0 .134%;

[0048] 3. Transfer 5800Kg of the above-mentioned semi-steel molten steel into the electric furnace, add 1270Kg of slag steel, 1000Kg of scrap piano, 600Kg of steamed bun cold iron, and smelt for 1.32 hours at 1620-1640°C, wherein the melting period is 48 minutes and the oxidation period is 26 minutes. ...

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PUM

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Abstract

The present invention provides steel making method with inferior pig iron, tail iron, iron grain, slag steel and other iron-containing leftover as material. The steel making process includes slagging, desulfurizing and dephosphorizing smelting in iron melting furnace; slagging, desulfurizing and dephosphorizing smelting in semi-steel furnace; and fluidized slag oxidizing, dephosphorizing and desulfurizing smelting in electric furnace to obtain finished steel. The present invention utilizes iron-containing leftover in making steel, and smelts steel in both semi-steel furnace and electric furnace, and has low steel producing cost and raises the production efficiency of electric furnace.

Description

technical field [0001] The invention relates to a steelmaking method, in particular to a steelmaking method using waste such as slag iron or high-sulfur, high-phosphorus out-of-standard iron or sand-containing iron as raw materials. Background technique [0002] Most of the traditional electric furnace steelmaking raw materials are scrap steel, and then mixed with a small amount of scrap iron and qualified pig iron to directly smelt qualified steel grades. This steelmaking method not only consumes electricity, but also has very high requirements for raw materials. With the continuous reduction of resources, the following phenomena have appeared in the current raw material market: on the one hand, the price of scrap steel has risen, and pig iron resources are seriously in short supply. On the other hand, a large amount of iron-containing waste, such as high-sulfur and high-phosphorus iron, sand-containing iron in iron ditch or slag ditch, and iron filings have not been fully ...

Claims

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Application Information

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IPC IPC(8): C21C5/00C21C5/52
CPCY02P10/20
Inventor 师尚智
Owner 师尚智
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