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RH refining rotary powder-spraying desulfurization method

A powder spraying and refining technology, which is applied in the field of iron and steel metallurgy, can solve the problems of poor control of desulfurization reaction kinetic conditions, low powder utilization rate, and high production cost, and achieve the goal of improving kinetic conditions, increasing residence time, and improving purity. Effect

Inactive Publication Date: 2019-04-16
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 inserts the spray gun into the molten steel, which has poor control over the dynamic conditions of the desulfurization reaction, and the desulfurization powder 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 rotary powder-spraying desulfurization method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 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 2580mm, and the inner height is 4300mm. The diameter of the vacuum chamber is 1780mm, the height of the vacuum chamber is 6810mm, 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.

[0020] The total length of the rotary powder spray gun is 7500mm, the length of the inverted T-shaped rotary head is 580mm, the diameter of the inverted T-shaped rotary head is 230mm, the diameter of the spray hole is 10mm, and the diameter of the hollow tube is 90mm.

[0021] The spray powder used is desulfurization powder, and its main components contain CaO78%, CaF 2 11%, CaCO 3 8%. The particle size is 0.02mm.

[0022] The desulfurization steps of m...

Embodiment 2

[0025] The implementation plan is carried out on a 180t molten steel tank, the upper diameter of the molten steel tank is 3150mm, the bottom diameter is 2600mm, and the inner height is 4300mm. The diameter of the vacuum chamber is 1750mm, the height of the vacuum chamber is 6850mm, the diameter of the ascending pipe is 580mm, 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 680mm, and the number of injection holes is 12.

[0026] The total length of the rotary powder spray gun is 7120mm, the length of the inverted T-shaped rotary head is 600mm, the diameter of the inverted T-shaped rotary head is 280mm, the diameter of the spray hole is 11mm, and the diameter of the hollow tube is 100mm.

[0027] The spray powder used is desulfurization powder, and its main components contain CaO68%, CaF 2 13%, CaCO 3 10%. The particle size is 0.025mm.

[0028] The desu...

Embodiment 3

[0031] The implementation plan is carried out on a 180t molten steel tank, the upper diameter of the molten steel tank is 3150mm, the bottom diameter is 2600mm, and the inner height is 4300mm. The diameter of the vacuum chamber is 1750mm, the height of the vacuum chamber is 7100mm, the diameter of the ascending pipe is 580mm, 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 680mm, and the number of injection holes is 12.

[0032] The total length of the rotary powder spray gun is 7800mm, the length of the inverted T-shaped rotary head is 580mm, the diameter of the stirring head is 280mm, the diameter of the spray hole is 10mm, and the diameter of the hollow tube is 110mm.

[0033] The spray powder used is desulfurization powder, and its main components contain CaO65%, CaF 2 15%, CaCO 3 13%. The particle size is 0.02mm.

[0034] The desulfurization steps o...

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Abstract

The invention discloses an RH refining rotary powder-spraying desulfurization method. The RH refining rotary powder-spraying desulfurization method comprises the following steps that (1) a rotary powder-spraying gun is inserted into the position 400-650 mm below a molten steel liquid surface to start rotary powder-spraying; (2) the rotating speed of the rotary powder-spraying gun is 100-140 r / min,the carrier gas flow of a rotary powder-spraying device is 30-90 Nm<3> / h, the carrier gas pressure is 0.5-1.1 MPa, the powder-spraying rate is 0.1-4.5 kg / s, and adopted carrier gas is Ar gas; and (3)the injection-blowing time of the rotary powder-spraying device is 10-20 min, the rotary powder-spraying gun is lifted out of the molten steel liquid surface after injection-blowing, the rotating speed is decreased to be 5-10 r / min or below, the rotary powder-spraying gun is lifted out of the molten steel liquid surface by 300-500 mm or above, rotating is accelerated again for 10-30 s, and the rotation number is 50-80 r / min.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a desulfurization method for 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, ...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/00C21C7/064
CPCC21C7/0037C21C7/0645C21C7/10
Inventor 赵亮廖相巍张晓光曹祥孙群万雪峰曹东田勇丁丽华
Owner ANGANG STEEL CO LTD
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