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Semisteel pretreatment powder and preparation method thereof, and smelting method of vanadium-containing molten iron

A smelting method and pretreatment technology, which is applied in the field of semi-steel pretreatment powder and its preparation, can solve the problems of large corrosion of the furnace lining and affect the life of the converter, and achieve the effects of prolonging the process time, avoiding excessive erosion, and simple operation

Active Publication Date: 2015-04-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the methods in the above two patent documents all use sodium compounds as dephosphorization agents and carry out dephosphorization in the vanadium extraction converter. Although this can achieve a certain dephosphorization effect, the addition of sodium compounds into the converter Great corrosion to the furnace lining, affecting the life of the converter
In addition, the methods in the above two patent documents do not carry out desulfurization treatment

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0016] The method for preparing semi-steel pretreatment powder on the one hand of the present invention comprises the following steps: lime (also can be pure CaO powder), carbon powder (also can be pure C powder), calcium carbide (also can be pure calcium carbide powder), Iron oxide, sodium oxide and magnesium powder are ground into a powder with a particle size not greater than 2mm, and 45-70 parts of lime powder, 1-5 parts of carbon powder, 2-10 parts of calcium carbide powder, 5-15 parts of Iron oxide powder, 10-15 parts of sodium oxide powder and 5-15 parts of magnesium powder are uniformly mixed to obtain semi-steel pretreatment powder, wherein the semi-steel is molten iron containing vanadium after vanadium extraction and smelting. Preferably, the ratio of raw materials to form the semi-steel pretreatment powder is 50-65 parts by weight of lime powder, 2-4 parts of carbon powder, 4-8 parts of calcium carbide powder, 7-12 parts of iron oxide powder, 12-14 parts of sodium ...

example 1

[0025] Lime, carbon powder, calcium carbide, iron oxide powder, sodium oxide, and magnesium powder are used as raw materials. The mass ratio of each raw material is: lime 70%, carbon powder 3%, calcium carbide 5%, iron oxide powder 5%, sodium oxide 12% , Magnesium powder 5%. The preparation method is to grind the above-mentioned components into 0-2mm powder, and mix them in proportion to obtain semi-steel pretreatment powder. Subsequently, the prepared semi-steel pretreatment powder is packed into a woven bag with a waterproof lining and sealed for packaging. When in use, unpack the semi-steel pretreatment powder and put it into a dry nitrogen-sealed high-level silo, and use the blowing method for pretreatment.

[0026]The phosphorus content in semi-steel after vanadium extraction is 0.063%, the sulfur content is 0.054%, and the amount of semi-steel pretreatment powder used for pretreatment is 6.5kg / t semi-steel. After the pretreatment, the test shows that the phosphorus con...

example 2

[0028] Lime, carbon powder, calcium carbide, iron oxide powder, sodium oxide, and magnesium powder are used as raw materials. The mass ratio of each raw material is: lime 45%, carbon powder 5%, calcium carbide 10%, iron oxide powder 15%, and sodium oxide 15%. , Magnesium powder 10%. The preparation method is to grind the above-mentioned components into 0-2mm powder, and mix them in proportion to obtain semi-steel pretreatment powder. Subsequently, the prepared semi-steel pretreatment powder is packed into a woven bag with a waterproof lining and sealed for packaging. When in use, unpack the semi-steel pretreatment powder and put it into a dry nitrogen-sealed high-level silo, and use the blowing method for pretreatment.

[0029] The phosphorus content in semi-steel after vanadium extraction is 0.070%, the sulfur content is 0.081%, and the amount of semi-steel pretreatment powder used for pretreatment is 5.8kg / t semi-steel. After the pretreatment, it is tested that the phospho...

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Abstract

The invention provides a semisteel pretreatment powder and a preparation method thereof, and a smelting method of vanadium-containing molten iron. The preparation method comprises the following steps: grinding lime, carbon powder, carbide, iron oxide, sodium oxide and magnesium powder into powders with the particle size of not greater than 2mm, and uniformly mixing 45-75 parts of lime powder, 1-5 parts of carbon powder, 2-10 parts of carbide powder, 5-15 parts of iron oxide powder, 10-15 parts of sodium oxide powder and 5-15 parts of magnesium powder to obtain the semisteel pretreatment powder. The smelting method comprises the following steps: feeding the semisteel pretreatment powder into a stock bin, and sealing with a dry inert gas; and adding the semisteel pretreatment powder into semisteel subjected to vanadium extraction to carry out pretreatment. The semisteel pretreatment powder can simultaneously carry out desulfurization and dephosphorization pretreatment on the semisteel subjected to vanadium extraction; the method is simple to operate, does not need to additionally construct related facilities and equipments, and does not prolong the procedure time; and the semisteel pretreatment powder can lower the consumption of auxiliary materials for converting, avoid too fast erosion of the liner, and reduce the sodium content in the vanadium slag.

Description

technical field [0001] The invention belongs to the technical field of vanadium-containing hot metal smelting, and specifically relates to a semi-steel pretreatment powder and a preparation method thereof, and a method for using the semi-steel pretreatment powder to pretreat semi-steel obtained from vanadium-containing molten iron . Background technique [0002] Generally, phosphorus and sulfur are harmful elements in most steel types. In recent years, with the rapid development of science and technology, low-temperature steel, marine steel, hydrogen-induced cracking-resistant steel and steel for some thick plates require both extremely low sulfur content and phosphorus content in steel <0.01% or 0.005 %. As we all know, the sulfur content directly affects the performance of steel. Excessive sulfur content in steel will lead to deterioration of the hot workability of steel, resulting in "hot embrittlement" of steel; cracks; the plasticity of steel also significantly de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 陈炼陈永戈文荪王建曾建华蒋龙奎李龙杨森祥卓钧董克平
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP