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A method for reducing chromium in electric arc furnace slag

A technology of electric arc furnace and slag, which is applied in the field of metallurgy, can solve problems such as chromium loss, low element utilization rate, and high chromium content, and achieve the effects of reducing chromium content, improving recovery, and reducing enterprise costs

Active Publication Date: 2017-01-11
ANHUI FUKAI STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for reducing the chromium element in the electric arc furnace slag, so as to solve the problem of high chromium content in the electric arc furnace slag, serious chromium loss and low element utilization rate in the electric arc furnace link of smelting stainless steel technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, taking the smelting process of austenitic stainless steel (304 steel) as an example, a method for reducing chromium in electric arc furnace slag is provided. According to the capacity of 30 tons of electric arc furnace, it includes the following steps:

[0020] (1) Ingredients: by weight, the amount of each element in the raw steel scrap into the furnace is: 1.5% carbon, 0.5% silicon, 18.3% chromium, and 7.9% nickel.

[0021] (2) Slagging: Put 800kg of lime at the bottom of the electric arc furnace first, then add the first can of raw materials for smelting, after the first can of material melts, then put in the second can of raw materials, and feed 5 cans in turn, the slag alkalinity is 1.4 ~2.0;

[0022] (3) Oxygen-controlled smelting: It is strictly forbidden to blow oxygen during the smelting process of the first tank of raw materials and the second tank of raw materials. The whole process is energized and the furnace door is kept closed. , addi...

Embodiment 2

[0028] In this embodiment, taking the smelting process of austenitic stainless steel (304 steel) as an example, a method for reducing chromium in electric arc furnace slag is provided. According to the capacity of 30 tons of electric arc furnace, it includes the following steps:

[0029] (1) Ingredients: by weight, the amount of each element in the raw steel scrap into the furnace is: 2.5% carbon, 0.8% silicon, 18.3% chromium, and 7.9% nickel.

[0030] (2) Slagging: Put 1000kg of lime at the bottom of the electric arc furnace first, then add the first can of raw materials for smelting, after the first can of material melts, then put in the second can of raw materials, and feed 8 cans in turn, the slag alkalinity is 1.4 ~2.0;

[0031] (3) Oxygen-controlled smelting: It is strictly forbidden to blow oxygen during the smelting process of the first tank of raw materials and the second tank of raw materials. The whole process is energized and the furnace door is kept closed. , add...

Embodiment 3

[0037] In this embodiment, taking the smelting process of austenitic stainless steel (304 steel) as an example, a method for reducing chromium in electric arc furnace slag is provided. According to the capacity of 30 tons of electric arc furnace, it includes the following steps:

[0038] (1) Ingredients: by weight, the amount of each element in the raw steel scrap into the furnace is: 1.8% carbon, 0.65% silicon, 18.3% chromium, and 7.9% nickel.

[0039] (2) Slagging: First put 900kg of lime into the bottom of the electric arc furnace, then add the first can of raw materials for smelting, after the first can of material melts, then put in the second can of raw materials, and feed 7 cans in turn, the slag alkalinity is 1.4 ~2.0;

[0040] (3) Oxygen-controlled smelting: It is strictly forbidden to blow oxygen during the smelting process of the first tank of raw materials and the second tank of raw materials. The whole process is energized and the furnace door is kept closed. , a...

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Abstract

The invention discloses a method for reducing chromium element in electric arc furnace slag. The method comprises the following steps: firstly controlling the alkalinity of the furnace slag to be 1.4-2.0 in a slag making process, staring to blow oxygen for assisting in dissolution from a raw material in a third tank, and adding silicon carbide into an electric arc furnace before blowing the oxygen for assisting in dissolution; further adding silicon carbide after the raw material in the electric arc furnace is totally molten, closing a furnace door, electrifying for 3-5min; and finally mixing molten steel and the furnace slag into a steel ladle, and putting silicon carbide into the steel ladle in the mixing process. Compared with the prior art, by adopting the method for reducing the chromium element in the electric arc furnace slag, under the situation of not increasing equipment investment, the chromium content in the furnace slag can be controlled at 6% by mass and below, and can be even reduced to 2.5% by mass sometimes, so that the recovery of the chromium element in the molten steel is greatly improved, the chromium content in the furnace slag is reduced, the cost of an enterprise is further reduced, and the utilization rate of resources is improved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a slag removal technology outside an electric arc furnace, in particular to a method for reducing the chromium element in the electric arc furnace slag. Background technique [0002] Due to its excellent performance, corrosion resistance, rust resistance and heat resistance, stainless steel should be widely used in various fields such as national construction and residents' daily use, especially in the automobile industry, water industry, environmental protection industry, home appliance industry, and major industries that have recently risen rapidly. The application in the field of industrial facilities has continuously increased the domestic stainless steel market demand, and more and more high-alloy steels have been continuously developed. Therefore, the demand for chromium-nickel elements for the production of stainless steel is increasing. However, my country is a country short of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 林立洲舒美良徐涛王中宏
Owner ANHUI FUKAI STAINLESS STEEL