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RH refining powder rotary-jetting and dephosphorizing method

A powder spraying and refining technology, applied in the field of iron and steel metallurgy, can solve the problems of slow mass transfer at the slag-steel interface, difficult diffusion of dephosphorization agents, and low utilization rate of powders, so as to improve kinetic conditions, increase residence time, and promote collisions. Effect

Inactive Publication Date: 2019-03-22
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method directly adds the dephosphorizing agent to the molten steel, which will cause the slow mass transfer rate at the slag-steel interface, and the dephosphorizing agent is not easy to diffuse in the molten steel, which makes the utilization rate of the powder low and the production cost is high.

Method used

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  • RH refining powder rotary-jetting and dephosphorizing method

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Experimental program
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Effect test

Embodiment 1

[0019] The implementation plan is carried out on a 180t molten steel tank, the diameter of the upper opening of the molten steel tank is 3200mm, the diameter of the bottom is 2620mm, and the inner height is 4300mm. The diameter of the vacuum chamber is 1760mm, the height of the vacuum chamber is 5120mm, the diameter of the ascending pipe is 600mm, and the diameter of the descending pipe is the same as that of the ascending pipe. Lift the gas injection hole to 630mm from the bottom of the vacuum chamber, and the number of injection holes is 10.

[0020] The total length of the rotary powder spray gun is 2600mm, the length of the inverted T-shaped rotary head is 560mm, the diameter of the stirring head is 220mm, the diameter of the spray hole is 10mm, and the diameter of the hollow tube is 90mm.

[0021] The main components of the described dephosphorization powder contain CaO55%, FeO25%, CaF 2 8%, MnO9%. The particle size of the dephosphorization agent is 0.05mm.

[0022] Th...

Embodiment 2

[0025] The implementation plan is carried out on a 180t molten steel tank, the upper diameter of the molten steel tank is 3120mm, the bottom diameter is 2600mm, and the inner height is 4280mm. The diameter of the vacuum chamber is 1750mm, the height of the vacuum chamber is 5100mm, the diameter of the ascending pipe is 610mm, and the diameter of the descending pipe is the same as that of the ascending pipe. The distance from the lifting gas injection hole to the bottom of the vacuum chamber is 650mm, and the number of injection holes is 12.

[0026] The total length of the rotary powder spray gun is 2750mm, the length of the inverted T-shaped rotary head is 600mm, the diameter of the stirring head is 260mm, the diameter of the spray hole is 11mm, and the diameter of the hollow tube is 100mm.

[0027] The main components of the dephosphorization powder used include CaO50%, FeO23%, CaF 2 12%, MnO 10%, the particle size of the dephosphorization agent is 0.055mm.

[0028] The de...

Embodiment 3

[0031] The implementation plan is carried out on a 180t molten steel tank, the upper diameter of the molten steel tank is 3130mm, the bottom diameter is 2580mm, and the inner height is 4280mm. The diameter of the vacuum chamber is 1750mm, the height of the vacuum chamber is 5100mm, the diameter of the ascending pipe is 580mm, and the diameter of the descending pipe is the same as that of the ascending pipe. Lift the gas injection hole to 650mm from the bottom of the vacuum chamber, and the number of injection holes is 10.

[0032] The total length of the rotary powder spray gun is 2650mm, the length of the inverted T-shaped rotary head is 580mm, the diameter of the stirring head is 290mm, the diameter of the spray hole is 9mm, and the diameter of the hollow tube is 110mm.

[0033] The main components of the dephosphorization powder used contain CaO53%, FeO25%, CaF 2 10%, MnO9%, the particle size of the dephosphorization agent is 0.06mm.

[0034] The dephosphorization steps of ...

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Abstract

The invention discloses an RH refining powder rotary-jetting and dephosphorizing method. The RH refining powder rotary-jetting and dephosphorizing method comprises the steps that (1) a powder rotary-jetting gun is inserted to the position 400-650 mm below the surface of molten steel, and starts rotary-jetting of powder; (2) the rotation speed of the powder rotary-jetting gun is 130-150 r / min, thecarrier gas flow of the powder rotary-jetting gun is 30-90 Nm<3> / h, the carrier gas pressure is 0.5-0.8 MPa, the powder jetting rate is 0.1-4.5 kg / s, and Ar is adopted as carrier gas; and (3) the spray-blowing time of the powder rotary-jetting gun is 10-20 min, the powder rotary-jetting gun is lifted out of the surface of the molten steel after spray-blowing is completed, the rotation speed is decreased to 5-10 r / min or below, and after the powder rotary-jetting gun is lifted to the position 300-500 mm above the surface of the molten steel, the powder rotary-jetting gun rotates at a higher speed of 50-80 r / min for 10-30 s.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, in particular to a method for dephosphorization by RH refining and rotary powder spraying. Background technique [0002] At present, the RH vacuum chamber injection technology sprays the refined powder into the molten pool in the vacuum chamber under high pressure rotation, the refined powder reacts with the chemical elements in the molten pool, and at the same time generates tiny microbubbles to capture and float the inclusions in the molten pool, which can play a role To purify molten steel while removing harmful elements in steel. [0003] Notification No. CN101323895B proposes a process for removing fine inclusions in molten steel. In this method, the prepared powder is sprayed into the molten steel, and micro-bubbles are generated by the reaction of the powder and elements in the molten steel to remove the inclusions in the molten steel. Purpose, the method is applied to LF, RH, VD ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/10
CPCC21C7/0068C21C7/0645C21C7/10
Inventor 赵亮廖相巍张晓光丁丽华曹祥孙群万雪峰曹东田勇康伟
Owner ANGANG STEEL CO LTD
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