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

A method for reducing sulfur return in semi-steel steelmaking converter

A steel-making converter and converter technology, applied in the direction of manufacturing converters, improving process efficiency, etc., can solve problems such as low furnace temperature, unfavorable sulfur content, and large temperature drop of molten iron, so as to reduce the amount of sulfur returned and benefit sulfur content, beneficial to the effect of control

Active Publication Date: 2015-11-18
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when vanadium-titanium-magnetite is used as raw material for ironmaking, it is difficult to control the process of sulfur. There are significant differences between the molten iron smelted from vanadium-titanium-magnetite blast furnace and ordinary molten iron: if the furnace temperature level is low (generally, the temperature difference is about 40~50℃), the desulfurization ability of the blast furnace is poor, and the [S] content of the molten iron smelted by the blast furnace is 0.030-0.040 percentage points higher than that of the molten iron without vanadium-titanium magnetite on average, etc.
Therefore, during the desulfurization of vanadium-titanium molten iron, the temperature drop of molten iron is relatively large, the state of slag is not good, and the iron loss is relatively large. Especially after the desulfurization process of vanadium-containing molten iron, the unit consumption of desulfurizer and iron loss are even more Significantly increased, desulfurization capacity decreased
In addition, vanadium extraction by converter is required after desulfurization of molten iron. Adding coolant such as pig iron block during the process of extracting vanadium by converter will cause serious resulfurization of semi-steel, which is not conducive to the control of sulfur content in steelmaking production. Therefore, it is necessary to extract vanadium Optimizing Sulfur Control in Titanium Hot Metal Steelmaking Process

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The vanadium-containing molten iron comprises 4.6% C, 0.22% Si, 0.18% Mn, 0.32% V, 0.17% Ti, 0.065% S, and the balance of Fe and unavoidable impurities by weight percentage, and The weight of the vanadium-containing molten iron is about 240t.

[0033] Vanadium-containing molten iron is treated by top-bottom combined blowing converter vanadium extraction method, and 35kg / t is added to the converter in the top-bottom combined blowing converter vanadium extraction method Fe oxide scale, and set the oxygen lance position at 1.8m ~ 2.0m, with 1.88Nm 3 / t·min top-blown oxygen supply intensity to the converter for 6 minutes, with 0.35Nm 3 The flow rate of / t·min is to blow nitrogen at the bottom of the converter, and the semi-steel is obtained after vanadium extraction, and the temperature of the semi-steel is 1367°C. Add semi-steel into semi-steel tank for desulfurization treatment, use KR desulfurization method for desulfurization treatment, add 22.5kg / t Fe The desulfuriz...

Embodiment 2

[0035] The vanadium-containing molten iron comprises 4.4% C, 0.23% Si, 0.16% Mn, 0.33% V, 0.18% Ti, 0.075% S, and the balance of Fe and unavoidable impurities by weight percentage, and The weight of the vanadium-containing molten iron is about 240t.

[0036] Vanadium-containing molten iron is treated by top-bottom combined blowing converter vanadium extraction method, and 36kg / t is added to the converter in the top-bottom combined blowing converter vanadium extraction method Fe Iron oxide scale, and set the oxygen gun position at 1.6m ~ 2.2m, with 2.15Nm 3 / t·min top-blown oxygen supply intensity to the converter for 5 minutes, with 0.15Nm 3 The flow rate of / t·min is to blow nitrogen at the bottom of the converter, and the semi-steel is obtained after vanadium extraction, and the temperature of the semi-steel is 1378°C. Add the semi-steel into the semi-steel tank for desulfurization treatment, and use the injection desulfurization method for desulfurization treatment, spray...

Embodiment 3

[0038] The vanadium-containing molten iron comprises 4.3% C, 0.20% Si, 0.16% Mn, 0.26% V, 0.22% Ti, 0.071% S, and the balance of Fe and unavoidable impurities by weight percentage, and The weight of the vanadium-containing molten iron is about 240t.

[0039] Vanadium-containing molten iron is treated by using the vanadium extraction method of the top-bottom combined blowing converter. In the vanadium extraction method of the top-bottom combined blowing converter, add 44kg / t to the converter Fe Iron oxide scale, and set the oxygen gun position at 1.6 ~ 1.8m, with 2.2Nm 3 / t·min top-blown oxygen supply intensity to the converter for 4 minutes, with 0.30Nm 3 The flow rate of / t·min is to blow nitrogen at the bottom of the converter, and the semi-steel is obtained after vanadium extraction, and the temperature of the semi-steel is 1388°C. Add the semi-steel into the semi-steel tank for desulfurization treatment, and use the spray desulfurization method for desulfurization treatm...

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 discloses a method for reducing the resulfurization of a semisteel-making converter. The method comprises the following steps of carrying out vanadium extraction treatment on vanadium-containing molten iron by using a top-bottom combined blowing converter vanadium extraction method: adding a 18-45kg / tFe coolant into a converter, setting an oxygen lance at a 1.6-2.2m position, blowing oxygen towards the converter at the top blowing oxygen intensity of 1.5-2.2Nm<3> / t.min for 4-6min, carrying out nitrogen bottom blowing on the converter at the flow of 0.10-0.35Nm<3> / t.min, and extracting vanadium to obtain smeisteel; carrying out desulfuration treatment on the semisteel; carrying out converter steel-making on the desulfurated semisteel. By using the method disclosed by the invention, the resulfurization quantity in the vanadium-containing molten iron steel-making process can be controlled at less than 0.002% so as to effectively reduce the resulfurization quantity in the vanadium-containing molten iron steel-making process. In addition, the method can be used for controlling the resulfurization quantity in the vanadium-contained molten iron at less than 0.011% so as to be beneficial to the control for the sulphur content in the steel-making process.

Description

technical field [0001] The invention relates to a method for controlling the sulfur return of a semi-steel steelmaking converter, in particular to a method for reducing the sulfur return of a semi-steel steelmaking converter by changing the smelting process. Background technique [0002] The sulfur content in steel directly affects the performance of steel. Excessive sulfur content in steel will lead to poor thermal processing performance of steel, resulting in "hot embrittlement" of steel; in addition, it will also significantly reduce the welding performance of steel, causing high temperature Cracks; at the same time, the plasticity of steel also significantly deteriorates with the increase of sulfur content; in pure iron or silicon steel sheets, the high sulfur content increases the hysteresis loss. So desulfurization is also one of the main goals in iron and steel smelting. Pre-desulfurization before converter steelmaking is an essential technical means for smelting low...

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): C21C5/35C21C7/064C21C7/072C21C7/076
CPCY02P10/20
Inventor 熊开伟张龙超陈炼朱鹏徐涛龚洪君
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD