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Efficient molten iron desulphurization spray gun

A high-efficiency technology for desulfurization of molten iron, which is applied to the field of desulfurization outside the furnace by injecting granular magnesium, and the field of high-efficiency molten iron desulfurization spray guns. Contact time, the effect of improving solubility

Pending Publication Date: 2018-08-14
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rapidly vaporized magnesium vapor floats up in a straight line, and the time spent in the molten iron is short. It is inevitable that the amount of magnesium vapor dissolved in the molten iron is not enough, or some of it escapes directly into the atmosphere, resulting in a decrease in desulfurization efficiency.

Method used

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  • Efficient molten iron desulphurization spray gun
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  • Efficient molten iron desulphurization spray gun

Examples

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Embodiment approach

[0041] As another preferred embodiment of the present invention, the high-efficiency molten iron desulfurization spray gun includes a pipe 2 and a number of nozzles 4, wherein the pipe 2 is a straight pipe (that is, only one outlet) set upright, and the immersion end or outlet passes through a multi-way connector They are respectively connected with a plurality of nozzles 4, and the nozzles 4 are arc-shaped tubes arranged horizontally.

[0042] Preferably, the nozzle 4 is an arc-shaped tube, and 2-4 nozzles 4 are used. In order to effectively diffuse the magnesium vapor into the molten iron, more preferably, the vertical distance between the outlet end of the nozzle 4 and the center line of the duct 2 is molten iron The bag cross-sectional radius is 1 / 3-1 / 2, and the central angle is 15°-20° (such as 16°, 17°, 18°, 19°).

[0043] In the preferred embodiment of the present invention, the nozzle 4 is a circular arc tube, preferably three nozzles 4 are used, the vertical distance betwe...

Embodiment 1

[0051] The high-efficiency molten iron desulfurization spray gun used in a factory includes a pipe 2 and a nozzle 4. The shape of the pipe 2 is a double-hole inverted T-shape, and the two outlets of the immersion end are respectively connected with two nozzles 4, see figure 2 , The nozzle 4 is a circular arc tube, the center line of the nozzle 4 is 2 / 3 of the ladle cross-sectional radius from the inner wall of the molten iron ladle, the central angle is 18°, the inner diameter of the nozzle 4 is 7mm, and the inner diameter of the conduit 2 is 16mm.

[0052] When working, insert the high-efficiency molten iron desulfurization spray gun to the designated 2.7m below the molten iron level, the distance between the nozzle 4 and the bottom surface of the desulfurization molten iron ladle is 0.25m, and start spraying. The spraying process parameters are as follows:

[0053] The nitrogen flow rate of the spray gun submerged into the molten iron is 120~140Nm 3 / h, pressure 0.75~0.86Mpa;

[00...

Embodiment 2

[0060] Except adopt image 3 Except for the spray gun of the structure shown, other injection process parameters are the same as in Example 1. The desulfurization effect of this embodiment is as follows: [S] in the molten iron is removed from 0.030% to 0.050% to less than 0.005%, and even reaches 0.001 to 0.002 %.

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Abstract

The invention provides an efficient molten iron desulphurization spray gun which comprises a guide pipe and a nozzle, wherein one end of the guide pipe is an immersing end which stretches into a ladle, and the guide pipe is immersed under the molten iron liquid level if being used; the other end of the guide pipe is located out of the ladle and is separately connected to a magnesium source and a pneumatic air source; the nozzle is an arc-shaped pipefitting and is connected to the outlet of the immersing end of the guide pipe for spraying magnesium steam out, so that magnesium steam moves spirally in the molten iron. The efficient molten iron desulphurization spray gun adopts the arc-shaped nozzle, so that particle magnesium rotates in the molten iron, and the magnesium ascends spirally inthe molten iron under the action of buoyancy force; under the same deep desulphurization condition, the contact time of the magnesium steam and the molten iron is prolonged greatly, and meanwhile, high pressure nitrogen carrying the magnesium steam ascends spirally to play a certain stirring role in the molten iron, too, so that the transfer speed of the magnesium steam is improved, the solubilityof magnesium is improved, and the desulphurization efficiency is further improved.

Description

Technical field [0001] The present invention relates to hot metal pretreatment technology, in particular to an out-of-furnace desulfurization technology of injecting particulate magnesium, and specifically provides a high-efficiency hot metal desulfurization spray gun, which can improve the desulfurization efficiency. Background technique [0002] The main properties of magnesium metal are as follows: atomic weight is 24.32, solid density is 1.74g / cm 3 (At 20℃), the melt density is 1.54g / cm 3 (At 700℃), the melting temperature is 650℃, and the boiling temperature is 1105℃. Magnesium has a very high affinity with sulfur. For low-temperature molten iron, magnesium is one of the most powerful desulfurizers. Compared with other desulfurizers, the amount of magnesium desulfurizer is small and the amount of slag generated is small, so it is desulfurized after desulfurization. The iron loss during slagging is small, the desulfurization process basically has no effect on the composition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02
CPCC21C1/02C21C7/064
Inventor 潘协田
Owner DAYE SPECIAL STEEL CO LTD
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