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Electric-arc furnace converter process for smelting steel and iron slag

A technology of smelting slag and electric arc furnace, which is applied in the direction of electric furnace, process efficiency improvement, furnace, etc., can solve the problems of large consumption of refractory materials, long smelting time, high production cost, etc., and achieve shortening of smelting time, short smelting time, and low The effect of smelting power consumption

Active Publication Date: 2015-05-20
RUI STEEL INDAL OF PANZHIHUA GANGCHENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the smelting time is long and the power consumption is high, resulting in the consumption of electrodes, alloys and refractory materials, which generally makes the production cost too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058] Furnace charge charging system: Load scrap steel so that the tapping amount of scrap steel accounts for 2% to 5% of the total furnace charge tapping amount; load molten iron so that the molten iron tapping amount accounts for 30% of the total furnace charge tapping amount; load slag steel and slag iron The tapping amount of slag steel and slag iron accounts for 65% to 68% of the tapping amount of the whole charge. The steel slag and iron slag are loaded in two times, and the steel slag and iron slag and steel scrap are loaded for the first time with a total of 50 tons. Among them, the large pieces of steel slag and iron slag are loaded on the bottom of the furnace, and the steel scrap is placed on the iron slag and steel slag. After electrification and smelting, after the charge is in a red state, 25t of molten iron is loaded into the furnace at a speed of 2.5t / min to 5t / min. After the molten iron is loaded, open the furnace door to supply oxygen to the self-consumption...

example 2

[0063] Furnace charge charging system: load scrap steel so that the tapping amount of scrap steel accounts for 2% to 5% of the total furnace charge tapping amount, load molten iron so that the molten iron tapping amount accounts for 40% of the total furnace charge tapping amount, and load slag steel and slag iron The tapping amount of slag steel and slag iron accounts for 55% to 58% of the tapping amount of the whole charge. The slag-steel-slag-iron is loaded in two times. For the first time, 40t of slag-steel-slag-iron and steel scrap are loaded, among which bulk raw materials are loaded at the bottom of the furnace, and steel scrap is placed on the slag-steel-slag-iron. After electrification and smelting, after the charge is in a red state, 35t of molten iron is loaded into the furnace at a speed of 2.5t / min to 5t / min. After the molten iron is loaded, open the furnace door self-consumption oxygen lance and the furnace wall cluster oxygen lance to supply oxygen. After the sla...

example 3

[0066] Furnace charge charging system: load scrap steel so that the tapping amount of scrap steel accounts for 2% to 5% of the total furnace charge tapping amount, load molten iron so that the molten iron tapping amount accounts for 50% of the total furnace charge tapping amount, and load slag steel and slag iron The tapping amount of slag steel and slag iron accounts for 45% to 48% of the tapping amount of the whole charge. A total of 50 tons of steel slag and steel scrap are loaded, of which large pieces of steel slag are placed on the bottom of the furnace, and steel scrap is placed on the steel slag. After electrification and smelting, after the charge is in a red state, 45t of molten iron is loaded into the furnace at a speed of 2.5t / min to 5t / min.

[0067] Oxygen supply system: equipped with a furnace door self-consumption oxygen lance and three furnace wall cluster oxygen lances for oxygen supply.

[0068] Furnace material turns red and opens the furnace door to supply...

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Abstract

The invention discloses an electric-arc furnace converter process for smelting steel and iron slag, belongs to the field of metallurgy, and aims to solve the technical problem about providing the electric-arc furnace converter process for smelting steel and iron slag with short duration of heat and low power consumption. In order to solve the technical problem, the invention provides the following technical scheme: furnace burden comprises molten iron, steel and iron slag, and steel scrap; molten iron is put into the furnace to enable the tapping of the molten iron accounts for 30-60% of that of all furnace burden; steel and iron slag is put into the furnace to enable the tapping of the steel and iron slag accounts for 35-70% of that of all furnace burden; when the steel scrap is put into the furnace for the first time, the tapping of the steel scrap accounts for 0-5% of that of all furnace burden; when the steel and iron slag is put into the furnace for the first time, the steel scrap is also put into the furnace, and the steel scrap is distributed on the steel and iron slag. With adoption of the process, the physical and chemical heat brought about by the molten iron is fully utilized to accelerate furnace burden melting and formation of the furnace burden in the furnace hearth, shorten melting time, reduce smelting power consumption, improve productivity and reduce production cost.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to an electric arc furnace smelting slag steel slag iron converter process. Background technique [0002] Under the condition of surplus molten iron in the blast furnace, mixing the molten iron into the electric furnace, making full use of the physical heat and chemical heat brought by the hot charging molten iron to increase the temperature of the molten steel, supplemented by oxygen blowing to support combustion, can realize the conversion of the electric furnace operation. At present, the electric converter technology is mainly applied in some large-scale electric furnace steelmaking enterprises in China, mainly using scrap steel and pig iron as raw materials to hot charge part of the molten iron for electric arc furnace steelmaking production. [0003] Since the slag steel slag iron raw material has the characteristics of large lumpiness, large slag content, many impuritie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 李文波刘新雷建许立志张建磊王和奇付成波刘怀辉
Owner RUI STEEL INDAL OF PANZHIHUA GANGCHENG GROUP
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