Electric furnace high voltage and large oxygen quantity foam slag smelting method

A smelting method and foamed slag technology, applied in electric furnaces, furnaces, furnace types, etc., can solve the problems of low production efficiency, long smelting time, low power supply voltage, etc., and achieve the effect of improving production efficiency and shortening smelting time

Inactive Publication Date: 2005-06-22
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of electric furnace steelmaking is that its smelting time is relatively long, which is 2-3 times that of converter smelting time, and the production efficiency is low
The reason for this phenomenon is that when the existing electric furnace is working, considering factors such as decarburization, slagging and reasonable matching of power supply, it is necessary to adopt different power supply modes in different periods, which are divided into several levels of power supply. The power supply voltage is low and the power is small. , resulting in long smelting time

Method used

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  • Electric furnace high voltage and large oxygen quantity foam slag smelting method
  • Electric furnace high voltage and large oxygen quantity foam slag smelting method
  • Electric furnace high voltage and large oxygen quantity foam slag smelting method

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: A method for smelting foamy slag in an electric furnace with high voltage and large oxygen content, comprising the following steps: 1. Keeping the reactive power of the electric furnace rectifier unchanged, moving its trigger angle forward, increasing the DC side voltage of the electric furnace rectifier and then increasing The output power of the electric furnace transformer adopts high voltage throughout the smelting process of the electric furnace except for the well penetration period; for a 70-ton electric furnace, the voltage can be increased to 595 volts, which is lower than the maximum voltage of the electric furnace (776V). 2. Oxygen blowing: put into the electric furnace door fast chemical material composed of bituminous coal and pitch coke, control the amount of steel remaining in the electric furnace to be 10% of the tapping amount, and leave hot slag in the furnace, 2 minutes after the electric furnace is powered on, Screw in the carbon-oxygen ...

Embodiment 2

[0037] Embodiment 2: A method for smelting foamy slag in an electric furnace with high voltage and large oxygen content, comprising the following steps: 1. Keeping the reactive power of the electric furnace rectifier unchanged, moving its trigger angle forward, increasing the DC side voltage of the electric furnace rectifier and then increasing The output power of the electric furnace transformer adopts high voltage throughout the smelting process of the electric furnace except for the well-piercing period of the electric furnace. For a 70-ton electric furnace, the voltage can be increased to 595 volts. 2. Oxygen blowing: put into the electric furnace door fast chemical material composed of bituminous coal and pitch coke, control the amount of steel remaining in the electric furnace to be 20% of the tapping amount, and leave hot slag in the furnace, 2 minutes after the electric furnace is powered on, Screw in the carbon-oxygen gun, increase the oxygen pressure to 5300Nm 3 / h ...

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Abstract

The invention discloses an electric furnace high voltage and large oxygen quantity foam slag smelting method which comprises, keeping the reactive power of the electric stove rectifier unchanged, forward leading the triggering angle, increasing the voltage on the D.C. side of the rectifier, applying a high voltage during the total procedure of electric stove smelting, charging furnace door quick smelting material into the electric stove, delivering power to the electric stove, oxygen blowing to melt the scrap steel, then inserting into molten pool for oxygen blowing, then charging a second batch of the material, delivering power, blowing oxygen immediately, adjusting scrap steel batching and molten iron proportion as well as furnace slag alkalinity, spraying carbon into the electric furnace, keeping the foam slag, measuring temperature and taking samples.

Description

technical field [0001] The invention belongs to the improvement of the electric furnace steelmaking method, in particular to the electric furnace high voltage and large oxygen foam slag smelting method. Background technique [0002] The current steel mills use smelting equipment such as electric furnaces or converters when making steel. The greenhouse effect gases (CO2) emitted by electric furnaces during smelting 2 ) amount is 1 / 4 of the emission amount when using the converter, so it is in line with the direction of sustainable development of the steel industry. However, the disadvantage of electric furnace steelmaking is that its smelting time is relatively long, which is 2-3 times that of converter smelting time, and the production efficiency is low. The reason for this phenomenon is that when the existing electric furnace is working, considering factors such as decarburization, slagging and reasonable matching of power supply, it is necessary to adopt different power s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 宋维兆王领莹王新成侯小平狄明军穆保安
Owner XINJIANG BAYI IRON & STEEL
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