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A method for generating tiny air bubbles in rh refining molten steel

A bubble and molten steel technology, applied in the field of generating tiny bubbles in RH refining molten steel, can solve the problems of harsh conditions and the effect of removing inclusions needs to be further improved, so as to achieve the effect of improving the removal effect and good removal effect.

Active Publication Date: 2020-12-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersed micro-bubbles have an excellent effect of adhering inclusions, but the conditions for generating micro-bubbles in molten steel are relatively harsh
The RH refining device realizes the circulating flow of molten steel, and the dynamic conditions are good, but the effect of removing inclusions in the RH refining device needs to be further improved

Method used

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  • A method for generating tiny air bubbles in rh refining molten steel
  • A method for generating tiny air bubbles in rh refining molten steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a 150tRH refining unit of a domestic steel plant, the inner diameter of the downcomer is 0.55m. Install 6 metal tubes on the side wall of the downcomer, the diameter of the metal tube is set to 0.8mm, and the gas flow rate of the upcomer is controlled to be 100m during the refining process 3 / h, the flow rate of molten steel at the outlet of the metal blowing pipe is 0.3m / s, and argon gas is blown into the molten steel through the metal pipe, and the flow rate is 1.2m 3 / h, 80% of the generated argon bubbles are small bubbles with a diameter of 2mm-4mm; the argon bubbles enter the ladle together with the downcomer molten steel, and during the downward movement, due to the increasing static pressure of the molten steel, the size of the bubbles further shrinks To 1.2mm-3.2mm; these small air bubbles move in the ladle with the molten steel, adhere to capture the inclusions in the steel, and finally float up into the ladle slag to promote the floating removal of inclusio...

Embodiment 2

[0032] In a 150tRH refining unit of a domestic steel plant, the inner diameter of the downcomer is 0.3m. Install 6 metal tubes on the side wall of the downcomer, the diameter of the metal tube is set to 0.8mm, and the gas flow rate of the upcomer is controlled to be 60m during the refining process 3 / h, the flow rate of molten steel at the outlet of the metal blowing pipe is 0.3m / s, and argon gas is blown into the molten steel through the metal pipe, and the flow rate is 1.2m 3 / h, 80% of the generated argon bubbles are small bubbles with a diameter of 2mm-4mm; the argon bubbles enter the ladle together with the downcomer molten steel, and during the downward movement, due to the increasing static pressure of the molten steel, the size of the bubbles further shrinks To 1.2mm-3.2mm; these small air bubbles move in the ladle with the molten steel, adhere to capture the inclusions in the steel, and finally float up into the ladle slag to promote the floating removal of inclusions...

Embodiment 3

[0034] In a 150tRH refining unit of a domestic steel plant, the inner diameter of the downcomer is 0.55m. Install 6 metal tubes on the side wall of the downcomer, the diameter of the metal tube is set to 0.8mm, and the gas flow rate of the upcomer is controlled to be 150m during the refining process 3 / h, the flow rate of molten steel at the outlet of the metal blowing pipe is 0.4m / s, and argon gas is blown into the molten steel through the metal pipe, and the flow rate is 1.2m 3 / h, 80% of the generated argon bubbles are small bubbles with a diameter of 1.6mm-3.6mm; the argon bubbles enter the ladle together with the downcomer molten steel, and during the downward movement, due to the increasing static pressure of the molten steel, the size of the bubbles Further narrowed to 1mm-2.9mm; these tiny air bubbles move with the molten steel in the ladle, adhere to capture the inclusions in the steel, and finally float up into the ladle slag to promote the floating removal of inclusi...

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Abstract

The invention provides a method for generating tiny bubbles in RH refined molten steel, and belongs to the field of steel making. A metal pipe or a direct-connection type air brick or a dispersion type air brick is arranged on the side wall of an RH refining device descending pipe, argon or argon and hydrogen or / and nitrogen mixed gas is used, and molten steel is blown in through the metal pipe orthe direct-connection type air brick or the dispersion type air brick; the gas flow is increased mainly by adjusting an RH ascending pipe, drag force is applied to the bubbles through the molten steel flowing in the descending pipe downwards, the diameters of most bubbles desorbed from air holes in the side wall of the descending pipe are controlled to be 1 mm-6 mm, and the bubbles enter a steelladle along with the molten steel in the descending pipe; and then the bubbles float into steel ladle slag, and inclusions in the molten steel adhere to the bubbles to be removed in the process. The sizes of the bubble generated with the method are small, the diameters of most bubbles are smaller than 6 mm, and the removal effect of the inclusions in the steel can be improved.

Description

technical field [0001] The invention belongs to the field of steelmaking, and relates to a technology for removing inclusions in molten steel, in particular to a method for generating tiny air bubbles in RH refining molten steel, which can significantly improve the effect of removing inclusions in molten steel. Background technique [0002] The quantity, size and distribution of inclusions in steel have a great influence on the quality of steel. Removing non-metallic inclusions in steel is one of the key technologies to improve the quality of steel products and produce clean steel. In the metallurgical process, most of the inclusions in molten steel are removed by floating up naturally under the action of buoyancy, and small inclusions usually cannot be removed naturally within one refining cycle. The removal of inclusions in the refining process is still a difficult problem. [0003] In recent years, the use of air bubbles to remove inclusions in steel has gradually become...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/072
CPCC21C7/072C21C7/10
Inventor 刘建华张硕何杨张杰
Owner UNIV OF SCI & TECH BEIJING