Bath smelting side-blowing jet flow gush type enhanced stirring method

A molten pool smelting and stirring method technology, applied in the field of metallurgy, can solve the problems affecting the rate of slagging reaction in the molten pool, the difficulty of blowing through the slag layer with oxygen-enriched air, and the short residence time of oxygen-enriched air, so as to increase the effective smelting area, prevent air bubbles from adhering to the wall and floating up, and the effect of good dynamic conditions

Inactive Publication Date: 2017-03-29
KUNMING UNIV OF SCI & TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

The oxygen-enriched side-blowing smelting technology used in the past belongs to the bubbly flow zone system, and the bubble volume under the bubbly flow zone system is large, the residence time of oxygen-enriched air in the molten pool is short, and the stirring of the molten pool is insufficient, which affects the molten pool. The rate of the slagging reaction makes the bed capacity of the side-blown furnace at a low level, and it is difficult for the oxygen-enriched air to blow through the slag layer, which limits the further expansion of the furnace body, resulting in a small amount of smelting in the side-blown furnace, while the oxygen-enriched air Sticking to the wall and floating up also caused a certain degree of erosion and corrosion on the furnace wall

Method used

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  • Bath smelting side-blowing jet flow gush type enhanced stirring method

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Experimental program
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Effect test

Embodiment 1

[0017] like figure 1 As shown, the side-blowing furnace in the copper smelting workshop of a certain smelting plant adopts the side-blowing jet flow intensified mixing method for melting pool smelting, the diameter of the nozzle is reduced from 5cm to 3cm, the wind pressure is increased from 0.1MPa to 0.25MPa, and the outlet flow rate It can reach 200m / s to ensure that the oxygen-enriched air (the oxygen content in the oxygen-enriched air is 23wt%) is blown into the molten pool in the form of a jet. The downward inclination angle of the nozzle is set to 25°, which further enhances the lateral penetration depth of the gas jet, reduces the erosion and corrosion effect of the bubbles on the furnace wall, and increases the service life of the furnace wall from 1 year to 2 years. The gas rate and turbulent kinetic energy are increased by more than 20%, which promotes the rapid and sufficient desulfurization and slagging reaction in the molten pool, and the bed capacity is increased...

Embodiment 2

[0019] The side-blowing furnace in the copper smelting workshop of a smelting plant adopts the side-blowing jet spring type enhanced mixing method for smelting the molten pool, the diameter of the nozzle is reduced from 5cm to 2cm, the wind pressure is increased from 0.1MPa to 0.3MPa, and the outlet flow rate can reach 250m / s, to ensure that the oxygen-enriched air (the oxygen content in the oxygen-enriched air is 99.9wt%) is blown into the molten pool in the form of a jet. The downward inclination angle of the nozzle is set to 20°, which further enhances the lateral penetration depth of the gas jet, reduces the erosion and corrosion effect of the bubbles on the furnace wall, and increases the service life of the furnace wall from 1 year to 2 years. The gas rate and turbulent kinetic energy are increased by more than 20%, which promotes the rapid and sufficient desulfurization and slagging reaction in the molten pool, and the bed capacity is increased from 20t / m 2 ·d increase...

Embodiment 3

[0021] The side-blowing furnace in the copper smelting workshop of a smelting plant, after adopting the side-blowing jet spring type intensified mixing method for melting pool smelting, the diameter of the nozzle is reduced from 5cm to 1cm, the wind pressure is increased from 0.1MPa to 0.2MPa, and the outlet flow rate can reach 150m / s, to ensure that the oxygen-enriched air (the oxygen content in the oxygen-enriched air is 40wt%) is blown into the molten pool in the form of a jet. The downward inclination angle of the nozzle is set to 5°, which further enhances the lateral penetration depth of the gas jet, reduces the erosion and corrosion effect of the bubbles on the furnace wall, and increases the service life of the furnace wall from 1 year to 1.5 years. The gas rate and turbulent kinetic energy are increased by more than 20%, which promotes the rapid and sufficient desulfurization and slagging reaction in the molten pool, and the bed capacity is increased from 20t / m 2 ·d ...

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Abstract

The invention relates to a bath smelting side-blowing jet flow gush type enhanced stirring method, belonging to the technical field of metallurgy. Firstly a nozzle is inclined to the bottom of a hearth with an inclination angle of 5 to 40 degrees; by reducing the diameter of the nozzle 1 to 1.0 to 3.0cm, and setting wind pressure in an air flue communicated with the nozzle to 0.2 to 0.4MPa, and enabling oxygen-rich air to blow into a bath from the side in a jet flow way, thus generating bath stirring like gush. The body of a side-blowing furnace can be enlarged to increase an effective smelting area, thus further improving smelting intensity of the side-blowing furnace, generating a scale effect, and reducing the unit production cost of the side-blowing furnace.

Description

technical field [0001] The invention relates to a side-blown jet flow spring type intensified stirring method for molten pool smelting, which belongs to the technical field of metallurgy. Background technique [0002] As the largest energy consumer and the largest carbon dioxide emitter, China is facing environmental problems characterized by "high carbon" and "high pollutant emissions". As a typical high-energy-consuming and high-emission industry, the metallurgical industry has received national attention. my country's "Twelfth Five-Year Plan" development plan clarifies the binding targets for energy conservation and emission reduction in the metallurgical industry, and intensifies efforts to eliminate backward production capacity. Therefore, independent innovation and development of new smelting energy-saving technologies will be accompanied by technological transformation and elimination of outdated processes and equipment, becoming the key to energy conservation and emi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/00
CPCC22B15/003
Inventor 王华刘泛函
Owner KUNMING UNIV OF SCI & TECH
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