Unlock instant, AI-driven research and patent intelligence for your innovation.

A converter steelmaking method

A converter steelmaking and steel slag technology, applied in the field of metallurgy, can solve the problems of high consumption of auxiliary materials, poor dephosphorization effect, large discharge of steel slag, etc., and achieve the effect of reducing consumption of auxiliary materials, reducing consumption of auxiliary materials, and reducing discharge of steel slag

Active Publication Date: 2022-05-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of steelmaking productivity and steel output, the auxiliary material consumption of this smelting method is still high, the discharge of steel slag is large, and the dephosphorization effect is not good

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A converter steelmaking method
  • A converter steelmaking method
  • A converter steelmaking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A 120t converter in a factory uses semi-steel for steelmaking, and the smelting steel type is HRB500.

[0085] S1. Single slag smelting in the first furnace: After the converter is mixed with semi-steel (semi-steel temperature 1280°C), the top-blown oxygen lance starts to blow oxygen, and at the same time, slagging materials are added to the furnace for slagging, and the basicity of the slag is controlled to be 3. End blowing at the end of blowing and tap steel; after that, slag splashing is carried out, and all slag remaining after slag splashing is recycled for the next furnace smelting.

[0086] in:

[0087] Oxygen supply strength is 3.0m 3 / (min tons of steel).

[0088] The slagging materials are: active lime 15kg / t steel, high magnesium lime 15kg / t steel, acid composite slagging agent 8kg / t steel.

[0089] The end point of blowing is: the temperature of molten steel is 1620°C, the carbon content of molten steel is 0.05%, and the phosphorus content of molten stee...

Embodiment 2

[0108] A 120t converter in a factory uses semi-steel for steelmaking, and the smelting steel type is HRB400.

[0109] S1. Single slag smelting in the first furnace: after the converter is mixed with semi-steel (the temperature of semi-steel is 1350°C), the top-blown oxygen lance starts to blow oxygen, and at the same time, slagging materials are added to the furnace for slagging, and the basicity of the slag is controlled to be 3. End blowing at the end of blowing and tap steel; after that, slag splashing is carried out, and all slag remaining after slag splashing is recycled for the next furnace smelting.

[0110] in:

[0111] Oxygen supply strength is 3.5m 3 / (min tons of steel).

[0112] The slagging materials are: active lime 20kg / t steel, high magnesium lime 10kg / t steel, acid composite slagging agent 12kg / t steel.

[0113] The end point of blowing is: the temperature of molten steel is 1660°C, the carbon content of molten steel is 0.20%, and the phosphorus content of ...

Embodiment 3

[0133] A 120t converter in a factory uses semi-steel for steelmaking, and the smelting steel type is HRB400.

[0134] S1. Single slag smelting in the first furnace: after the converter is mixed with semi-steel (the temperature of semi-steel is 1300°C), the top-blown oxygen lance starts to blow oxygen. 3. End blowing at the end of blowing and tap steel; after that, slag splashing is carried out, and all slag remaining after slag splashing is recycled for the next furnace smelting.

[0135] in:

[0136] Oxygen supply strength is 3.5m 3 / (min tons of steel).

[0137] The slagging materials are: active lime 18kg / t steel, high magnesium lime 12kg / t steel, acid composite slagging agent 10kg / t steel.

[0138] The end point of blowing is: the temperature of molten steel is 1640°C, the carbon content of molten steel is 0.12%, and the phosphorus content of molten steel is 0.012%.

[0139] S2. Second furnace single slag smelting: smelting is carried out according to the smelting meth...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a converter steelmaking method. In the converter steelmaking method provided by the present invention, the first furnace and the second furnace are smelted with single slag, and from the third furnace all adopt double slag smelting, and from the fourth furnace, the smelting of the previous furnace is carried out before smelting. The phosphorus content of the slag is tested, and then, according to the phosphorus content in the slag, it is determined whether to dephosphorize the slag and what kind of dephosphorization treatment is to be performed, and the steel slag is dephosphorized and reused through a certain cascade dephosphorization system, and multiple furnace cycles are realized. Utilization, the effective components and heat of steel slag are effectively used, the consumption of auxiliary materials is significantly reduced, the recycling of hot steel slag is realized, the purpose of reducing steel slag discharge is achieved, and the dephosphorization effect of molten steel is guaranteed. The above-mentioned steelmaking method provided by the present invention has fast slagging speed, can ensure dephosphorization effect under the condition of low auxiliary material consumption, can significantly reduce the auxiliary materials added in each furnace, realize the recycling of steel slag, and reduce the discharge of steel slag.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a converter steelmaking method. Background technique [0002] Steel slag refers to the slag discharged during the steelmaking process, which is mainly brought in by the oxides formed after the oxidation of various elements in the metal furnace lining material during the blowing process, the eroded furnace lining material, furnace repair material, and metal furnace charge. Impurities, and slagging materials specially added to adjust the properties of steel slag; its main chemical components are: CaO, SiO 2 、Al 2 o 3 , FeO, Fe 2 o 3 , MgO, MnO, P 2 o 5 Wait. The amount of steel slag is generally 8% to 15% of steel output, which is a relatively large amount of emissions. Different iron and steel production technologies will produce steel slag, such as converter smelting, electric furnace smelting and refining furnace smelting, etc. my country mainly uses converter steelmaking, so m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/36
CPCC21C5/35C21C5/36Y02P10/20
Inventor 陈均曾建华梁新腾
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP