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Final slag modifier and converter semisteel steelmaking final slag modification method

A modifier and final slag technology, applied in the field of metallurgy, can solve the problems affecting the cost of steelmaking and the age of the converter, high oxygen content of molten steel, strong fluidity, etc., to improve the effect of slag splashing, reduce oxygen content, and improve flow. sexual effect

Inactive Publication Date: 2019-08-16
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a final slag modifying agent and a method for modifying the final slag of converter semi-steelmaking, aiming to solve the problem of high oxygen content in molten steel and high iron oxide content in slag after converter semi-steelmaking operation. The slag is relatively dilute and fluid, which is a technical problem that affects the cost of steelmaking and the life of the converter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] Production of steel grade SS400, semi-steel weight 170 tons, scrap steel 16 tons, semi-steel temperature 1372°C, semi-steel chemical composition weight percentage: C: 3.68%, Si: 0.005%, Mn: 0.03%, P: 0.123%, S : 0.036%, Ti: 0.009%, the target composition at the end of the converter is [C] 0.06-0.10%, [S] ≤ 0.035%, [P] ≤ 0.025%.

[0034] Step 1: During the blowing process, add lime 25.1Kg / t, lightly burned dolomite 13.8Kg / t, machine-burned ore 5.2Kg / t, the blowing process is stable, oxygen supply is 39.5 liters / t, and the auxiliary gun is used to measure after blowing The temperature is 1635°C.

[0035] Step 2: After blowing, the oxygen content at the end point of the molten steel is 425ppm, the test results [C]: 0.067%, [S]: 0.027%, [P]: 0.021%.

[0036] Step 3: Pour the converter to the large surface to take the unmodified final slag sample for analysis, the content of TFe is 23.1%, and the content of MgO is 7.4%.

[0037]Step 4: Put the converter upright, add 1.5Kg / ...

example 2

[0042] Production of steel type SPHC, semi-steel weight 167 tons, scrap steel 19 tons, semi-steel temperature 1365°C, semi-steel chemical composition weight percentage: C: 3.61%, Si: 0.004%, Mn: 0.02%, P: 0.119%, S : 0.021%, Ti: 0.007%, the target composition of the converter end point is [C] ≤ 0.04%, [S] ≤ 0.020%, [P] ≤ 0.015%.

[0043] Step 1: During the blowing process, add 29.1Kg / t of lime, 14.4Kg / t of lightly burned dolomite, and 2.3Kg / t of mechanically burned ore. The temperature is 1623°C.

[0044] Step 2: After blowing, the oxygen content at the end point of molten steel is 869ppm, the test results [C]: 0.036%, [S]: 0.016%, [P]: 0.012%.

[0045] Step 3: Pour the converter to the large surface to take the unmodified final slag sample for analysis, the content of TFe is 24.3%, and the content of MgO is 7.9%.

[0046] Step 4: Put the converter upright, add 4.3Kg / t final slag modifier into the converter, the particle size is 30mm, the final slag modifier includes: 55% Mg...

example 3

[0051] Production of steel type Q235B, semi-steel weight 169 tons, scrap steel 17 tons, semi-steel temperature 1374°C, semi-steel chemical composition weight percentage: C: 3.71%, Si: 0.004%, Mn: 0.02%, P: 0.121%, S : 0.032%, Ti: 0.008%, the target composition at the end of the converter is [C] 0.07-0.10%, [S] ≤ 0.035%, [P] ≤ 0.025%.

[0052] Step 1: During the blowing process, add 24.6Kg / t of lime, 12.9Kg / t of lightly burned dolomite, and 4.3Kg / t of machine-burned ore. The blowing process is stable, and the oxygen supply is 40.1 liters / t. After blowing, use an auxiliary gun to measure The temperature is 1632°C.

[0053] Step 2: After blowing, the oxygen content at the end point of molten steel is 423ppm, and the test results [C]: 0.069%, [S]: 0.026%, [P]: 0.020%.

[0054] Step 3: Pour the converter to the large surface to take the unmodified final slag sample for analysis, the content of TFe is 22.3%, and the content of MgO is 7.9%.

[0055] Step 4: Put the converter uprigh...

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Abstract

The invention provides a final slag modifier and a converter semisteel steelmaking final slag modification method, and belongs to the technical field of metallurgy. The final slag modifier comprises 50%-55% of MgO, 1%-6% of Si02 and 12%-18% of C. According to the final slag modifier, the deoxygenization can be conducted on the final slag, and the content of MgO in the final slag and the viscosityof the final slag can be adjusted. The converter semisteel steelmaking final slag modification method comprises the following step of adding the final slag modifier into the final molten steel after melt blowing and before steel tapping. According to the converter semisteel steelmaking final slag modification method, the converter semisteel steelmaking final slag is modified, the oxygen content ofthe molten steel is reduced, the content of TFe in the final slag is reduced, the content of MgO of the final slag is increased, and the viscosity of the final slag is improved, the fluidity of the final slag is improved so that the later slag splashing effect is improved, thus prolonging the service life of the furnace lining.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically relates to a final slag modifying agent and a method for modifying the final slag of converter semi-steelmaking. Background technique [0002] The molten iron is subjected to vanadium extraction treatment, and the molten iron after vanadium extraction is called semi-steel, and the semi-steel is put into the converter again for smelting to become qualified molten steel. Due to traces of silicon, titanium and manganese heating elements in converter semi-steelmaking, insufficient heat for steelmaking, difficulty in slag melting, and unreasonable iron-calcium slag system lead to high oxygen content in molten steel after steelmaking operations and relatively high iron oxide content in slag. High, while iron oxide can significantly reduce the viscosity of slag in alkaline slag, resulting in thinner semi-steelmaking final slag of converter and strong fluidity, which affects the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C22C37/10C22C38/02C22C38/04C22C38/14
CPCC21C5/36C22C37/10C22C38/002C22C38/02C22C38/04C22C38/14
Inventor 韩德文吴雨晨张文彪梁静召仇军郭盈伟
Owner HEBEI IRON AND STEEL