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A method for increasing the yield of chromium in a stainless steel AOD converter

A stainless steel and yield technology, applied in the manufacture of converters, etc., can solve the problems of low chromium yield and high cost, and achieve the effects of reducing smelting costs, adding more accurately, and increasing yield

Active Publication Date: 2022-02-11
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is: in order to solve the problem of low chromium yield and high cost in the existing stainless steel smelting process, the present invention provides a method for improving the chromium yield of a stainless steel AOD converter with simple method, easy operation and control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for improving chromium yield in 304 stainless steel AOD converter

[0031] Including the following steps:

[0032] Step 1, ferrochrome sieving: use a 5mm sieve to sieve the ferrochrome raw material, collect ferrochrome with a particle size ≥ 5mm and ferrochrome with a particle size ≤ 5mm respectively for subsequent use;

[0033] Step 2. Pelletizing ferrochrome powder: mix clay, magnesium chloride, water and ferrochrome with a particle size ≤ 5mm obtained in step 1 in proportion, and stir at 450 rpm for 25 minutes, and then under the condition of a pressure of 0.5MPa Press down into a spherical shape, and dry under the condition of 40°C to obtain a spherical ferrochromium with a particle size of 6mm;

[0034] Among the above, the mass percentages of the raw materials in clay, magnesium chloride, water and ferrochrome with a particle size of ≤5mm are: 20.0% of clay, 1.0% of magnesium chloride, 5.0% of water, and 74.0% of ferrochrome with a particle size of ≤5mm;...

Embodiment 2

[0042] A method for increasing chromium yield in 430 stainless steel AOD converter

[0043] Including the following steps:

[0044] Step 1, ferrochrome sieving: use a 5mm sieve to sieve the ferrochrome raw material, collect ferrochrome with a particle size ≥ 5mm and ferrochrome with a particle size ≤ 5mm respectively for subsequent use;

[0045] Step 2, pelletizing ferrochrome powder: mix clay, magnesium chloride, water and the ferrochrome with particle size ≤ 5mm obtained in step 1 in proportion, and stir for 15min at a rate of 650 rpm, and then under the condition of a pressure of 1.5MPa Press down into a spherical shape, and dry under the condition of 45°C to obtain a spherical ferrochromium with a particle diameter of 9mm;

[0046] Among the above, the mass percentages of the raw materials in clay, magnesium chloride, water and ferrochrome with particle size ≤ 5mm are: 25.0% clay, 0.5% magnesium chloride, 4.0% water, 70.5% ferrochrome with particle size ≤ 5mm; among them,...

Embodiment 3

[0054] A method for improving chromium yield in 410S stainless steel AOD converter

[0055] Including the following steps:

[0056] Step 1, ferrochrome sieving: use a 5mm sieve to sieve the ferrochrome raw material, collect ferrochrome with a particle size ≥ 5mm and ferrochrome with a particle size ≤ 5mm respectively for subsequent use;

[0057] Step 2. Pelletizing ferrochrome powder: mix clay, magnesium chloride, water and ferrochrome with particle size ≤ 5mm obtained in step 1 in proportion, and stir at 550 rpm for 20 minutes, and then under the condition of pressure 1.0MPa Press down into spherical shape, and dry under the condition of 43 ℃ to obtain particle diameter as spherical ferrochrome of 8mm;

[0058] Among the above, the mass percentages of the raw materials in clay, magnesium chloride, water and ferrochrome with particle size ≤ 5mm are: 22.5% clay, 0.5% magnesium chloride, 4.5% water, 72.5% ferrochrome with particle size ≤ 5mm; among them, silicic acid in clay T...

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Abstract

The invention discloses a method for increasing the yield of chromium in a stainless steel AOD converter, relates to the technical field of stainless steel smelting, and is used to solve the technical problems that the chromium yield is too low and the smelting cost is high in the current stainless steel smelting process. The stainless steel AOD converter of the invention The methods to increase the yield of chromium include ferrochrome sieving, pelletizing of ferrochrome powder and AOD converter smelting. In the method for improving the yield of chromium in the stainless steel AOD converter of the present invention, at first ferrochrome is screened, the ferrochrome with large particle size is directly added to the AOD converter, and the ferrochrome powder with small particle size is added to the AOD converter after pelletizing to avoid particle size The small ferrochromium powder is sucked away by the dust removal fan during the AOD converter smelting process, which increases the yield of chromium and reduces the cost of stainless steel smelting.

Description

technical field [0001] The invention relates to the technical field of stainless steel smelting, and more specifically relates to a method for improving the yield of chromium in a stainless steel AOD converter. Background technique [0002] Due to its excellent corrosion resistance and excellent comprehensive performance, stainless steel is increasingly widely used in various industrial and civil fields. Although my country's stainless steel production started relatively late, with the rapid development of industrial economy, my country has gradually become a big consumption and production country of stainless steel. At present, the development direction of my country's stainless steel production is mainly to improve quality, reduce costs, save energy and reduce emissions, while continuously optimizing the matching of raw materials and technical equipment. [0003] By studying the smelting process of various types of stainless steel, it is found that with the increase of ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C5/28C21C7/00
CPCC22C33/06C21C5/005C21C7/0006
Inventor 李振钢陈兴润
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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