Composite gun body, stainless steel smelting system and ladle top blowing reduction and desulfurization process

A stainless steel and process technology, applied in the field of stainless steel smelting, can solve the problems of increased slag viscosity and reduced desulfurization effect, and achieve the effects of reduced quality defects, good economic benefits, and reduced oxidation loss

Active Publication Date: 2021-10-26
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the alkalinity is too high, the viscosity of the slag will often increase, which will reduce the desulfurization effect

Method used

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  • Composite gun body, stainless steel smelting system and ladle top blowing reduction and desulfurization process
  • Composite gun body, stainless steel smelting system and ladle top blowing reduction and desulfurization process
  • Composite gun body, stainless steel smelting system and ladle top blowing reduction and desulfurization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] This embodiment provides a composite gun body, its structural schematic diagram is as follows Figure 1-Figure 2 as shown, figure 1 The enlarged schematic diagram of H in image 3 as shown, figure 2 The enlarged schematic diagram of M in Figure 5 shown, from Figure 1-Figure 3 and Figure 5 It can be seen from the figure that the composite gun body includes the upper part 0 of the gun body and the lower part 9 of the gun body. The first casing 5 and the upper section 6 of the sealing flange, such as Figure 8a-Figure 8b As shown; the outer wall of the first seamless steel pipe 3 is fixed with a fixed plate 4 along the circumferential direction near its closed end, the first sleeve 5 is sleeved outside the first seamless steel pipe 3, and the first seamless steel pipe 3 One end of the casing 5 is fixed under the fixing plate 4, and the other end of the first casing 5 is fixed on the upper section 6 of the sealing flange; between the first seamless steel pipe 3 an...

Embodiment 2

[0144] This embodiment provides a stainless steel smelting system, including an electric arc furnace, a ladle, an AOD furnace, and a slag removal station, the slag removal station is provided with a mobile smoke hood, wherein the stainless steel smelting system also includes the above-mentioned embodiment 1. The composite gun body of the composite gun body, the composite gun body passes through the moving fume hood and is inserted into the molten soup contained in the ladle;

[0145] In this embodiment, the system further includes a lifting device for lifting the composite gun body;

[0146] In this embodiment, the clearance of the ladle is greater than 500mm.

Embodiment 3

[0148] This embodiment provides a stainless steel ladle top blowing stirring reduction and pre-desulfurization process, wherein the process is carried out using the stainless steel smelting system provided in Example 2, which includes:

[0149] (1) Put the slag-containing soup (the amount is 9-11 tons) from the electric arc furnace into the ladle, and the temperature of the slag-containing soup from the electric arc furnace is 1550-1600°C; then insert the composite gun body In the molten soup in the ladle, nitrogen or argon gas is blown into the ladle through the composite gun body and stirred to make the molten soup vortex; then add a reducing agent to the ladle to reduce the slag in the molten soup treating to reduce chromium oxides in said slag;

[0150] (2) Carry out the slag removal operation on the ladle after the reduction treatment, after the slag removal operation, the residual slag amount is ≤500kg;

[0151] (3) Continue to blow nitrogen or argon into the ladle throug...

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Abstract

The invention provides a composite gun body, a stainless steel smelting system and a ladle top blowing reduction and desulfurization process. The composite gun body includes an upper part of the gun body and a lower part of the gun body. The upper part of the gun body includes a first seam steel pipe, the first casing and the upper section of the sealing flange; the lower part of the gun body includes the lower section of the sealing flange, the second seamless steel pipe, the second casing, an isolation plate, a support rod and a number of injection pipes; close to the first The outer wall of the second end of the second seamless steel pipe is provided with a number of downward blowing pipes, and several of the blowing pipes communicate with the second seamless steel pipe; The outer walls of the support rods are all coated with refractory materials, and the refractory materials cover several of the spray pipes, and the gas outlets of the several spray pipes are exposed outside the refractory materials.

Description

technical field [0001] The invention relates to a composite gun body, a stainless steel smelting system and a ladle top blowing reduction and desulfurization process, belonging to the technical field of stainless steel smelting. Background technique [0002] At present, the equipment used in stainless steel smelting is divided into two categories: primary smelting equipment and refining equipment. Primary smelting equipment includes: electric arc furnace (EAF), non-vacuum induction furnace (generally used for small-scale production), submerged arc furnace, and converter. Refining equipment mainly includes ladle-type refining equipment (such as VOD, SS-VOD, VOD-PB, etc.), converter-type refining equipment (such as AOD, VODC, VCR, CLU, KCB-S, KOBMS, K-BOP, MRP-L, GOR, etc.) and RH function-extended refining equipment (such as RH-OB, RH-KTB, RH-KPB, etc.) [0003] Generally speaking, when the smelting raw material is scrap steel, the primary smelting equipment adopts the short...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C7/064C21C7/072C21C7/10C21C7/076
CPCC21C5/005C21C7/0645C21C7/072C21C7/076C21C7/10Y02P10/20
Inventor 林卫华黄华平金雄杰
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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