Slit type ladle bottom blowing powder injection process and apparatus

A slit-type, powder-spraying technology, used in the manufacture of converters, etc.

Inactive Publication Date: 2006-06-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] Aiming at the deficiencies of existing iron and steel refining processes and devi...

Method used

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  • Slit type ladle bottom blowing powder injection process and apparatus
  • Slit type ladle bottom blowing powder injection process and apparatus
  • Slit type ladle bottom blowing powder injection process and apparatus

Examples

Experimental program
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Embodiment 1

[0121] Embodiment 1 further describes the slit-type ladle bottom blowing powder device of the present invention, and Embodiments 2-6 specifically describe the slit-type ladle bottom blowing powder process implemented under different equipment parameters and different process conditions.

[0122] Example 1

[0123] Such as figure 2 As shown, the slit-type ladle bottom blowing powder spraying device of the present invention includes a slit-type air-permeable brick 5 , a pipeline 6 , and a powder spraying tank system 7 . The slit-type air-permeable brick 5 is installed at the bottom of the ladle 4, and the slit-type air-permeable brick 5 is connected with the powder spray tank system 7 through the pipeline 6.

[0124] There is a slit in the middle of the slit-type air-permeable brick, which is symmetrically distributed, and the slit width should be limited to 0.1mm to 0.3mm.

[0125] The powder spray tank system 7 includes 8 storage bins, 9 manual sliding door, 10 feed valve, ...

Embodiment 2

[0144] Cold state implementation, the implementation conditions are as follows:

[0145] Ventilation bricks: slit-type ventilation bricks used on 30-ton ladles. The outlet diameter of the ventilation bricks is 73mm, the slit width is 0.15mm, and the number of slits is 18.

[0146] Powder: passivated lime, particle diameter less than 45μm

[0147] Delivery gas: compressed air after drying

[0148] The velocity of gas in the pipeline: 10m / s

[0149] Temperature: room temperature

[0150] Contact medium: atmosphere

[0151] Gas pressure: 0.3MPa

[0152] Powder volume percentage: φ=0, 10, 20, 30, 40

[0153] Implementation process: In this embodiment, the gas powder flow is directly injected into the atmosphere. Before powder spraying, the drainage gas is first opened until the predetermined pressure is 0.3MPa, and then the feeding valve is opened to start powder spraying. After the lime injection is completed, the feeding valve is closed. , the drainage gas continues to wor...

Embodiment 3

[0156] For hot implementation, the implementation conditions are as follows:

[0157] Ventilation bricks: slit-type ventilation bricks used on 30-ton ladles, the outlet diameter of the ventilation bricks is 73mm, and the slit width is 0.15mm. In order to be suitable for working on a small induction furnace, the number of slits of the ventilation brick is reduced from 18 to 8.

[0158] Powder: carbon powder, the particle diameter is less than 30μm

[0159] Delivery gas: compressed air after drying

[0160] The velocity of gas in the pipeline: 7m / s

[0161] Temperature: 1500°C

[0162] Contact medium: molten iron

[0163] Gas pressure: 0.45MPa

[0164] Container: 200kg induction furnace

[0165] Powder volume percentage: φ=10, 30

[0166] Implementation process: In this embodiment, carbon powder is sprayed into a 200kg induction furnace equipped with molten iron. Before powder spraying, the drainage gas is first opened until the predetermined pressure of 0.45 MPa is reached...

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Abstract

The invention relates narrow slit type ladle bottom-blown dusting technology, comprising the following steps: conveying fluidized dust to narrow slit type air brick by dusting pot system, then spraying the dust into molten steel with narrow slit type air brick. The narrow slit type ladle bottom-blown dusting device comprises pipe line, dusting pot system, narrow slit type air brick which is set in the bottom of ladle and connected with dusting pot system. The invention comprises the following steps: easy to realize; safety and high reliability, avoiding the stoppage, meeting all requirements of gas content in many conditions; immediately removing the desulfurization product to clean the molten steel; good stirring effect; saving the up-down device and low cost of technical innovation.

Description

technical field [0001] The invention belongs to the technical field of iron and steel refining, and in particular relates to a slit type ladle bottom blowing powder spraying process and a device. Background technique [0002] Improving the purity of steel can significantly improve the mechanical properties of steel. The development of high-clean steel production technology and equipment is one of the key points in the structural optimization of my country's iron and steel enterprises. With the development of society, the requirements for steel are getting higher and higher, and even mass-produced common products have higher requirements due to the deterioration of service conditions. Table 1 shows the development trend of the control level of impurity elements in steel. [0003] Table 1 Development trend of control level of impurity elements in steel (×10 -6 ) [0004] [0005] It can be seen from Table 1 that users' requirements for sulfur in steel are becoming more ...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C5/34
Inventor 朱苗勇周建安潘时松沙骏
Owner NORTHEASTERN UNIV
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