Method for online rapid cleaning of converter lance bonded steel slag

A converter oxygen lance and oxygen lance technology, which is applied in the manufacture of converters, etc., can solve the problems of reduced converter life, converter lining erosion, etc., and achieve the effects of prolonging converter life, reducing impact time, reducing labor intensity and maintenance costs

Inactive Publication Date: 2016-04-20
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can clean the steel slag attached to the oxygen lance, it will also cause a certain amount of erosion to the converter lining while cleaning the steel slag attached to the steel pipe on the outer layer of the oxygen lance, resulting in a reduction in the life of the converter.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After the blowing was completed, the steel was tapped directly from the shaking furnace. The tapping temperature was 1615°C. During the process of lifting the lance to the upper limit, the tension of the steel wire rope of the oxygen lance was greater than the overweight alarm value, and the oxygen lance automatically stopped; The gun was stuck under the small flue, so immediately arrange an empty slag tank to prepare for quick slag dumping; after tapping, immediately shake the furnace to pour out all the slag in the furnace, and ensure that the slag is poured out within 10 minutes. After quick slag dumping, lower the oxygen lance to a position 2.25m away from the furnace bottom, confirm that the tension value of one of the steel wire ropes is 5.92t, and check the records to confirm that the initial tension value of the steel wire rope is 5.75t, and bake in the furnace After 5 minutes, manually open the oxygen valve, the oxygen supply intensity is 2.8Nm 3 / min.t, the pr...

Embodiment 2

[0025] After the blowing is finished, the steel is tapped directly from the shaking furnace, and the tapping temperature is 1644°C. In the process of lifting the gun to the upper limit, the tension of the steel wire rope of the oxygen gun is greater than the overweight alarm value, and the oxygen gun stops automatically. After observation, it was found that the oxygen lance was seriously stuck to steel slag, and the oxygen lance was stuck under the small flue. Therefore, immediately arrange for empty slag tanks to be ready for quick slag dumping. After tapping, immediately shake the furnace to pour out all the slag in the furnace, and ensure that the slag is poured out within 10 minutes. After quick slag dumping, lower the oxygen lance to a position 2.25m away from the furnace bottom, confirm that the tension value of one of the steel wire ropes is 6.05t, and check the records to confirm that the initial tension value of the steel wire rope is 5.75t. After baking in the oven...

Embodiment 3

[0027] After the blowing is completed, the steel is tapped directly from the shaking furnace, and the tapping temperature is 1677°C. In the process of lifting the gun to the upper limit, the tension of the steel wire rope of the oxygen gun is greater than the overweight alarm value, and the oxygen gun stops automatically. After observation, it was found that the oxygen lance was seriously stuck to steel slag, and the oxygen lance was stuck under the small flue. Therefore, immediately arrange for empty slag tanks to be ready for quick slag dumping. After tapping, immediately shake the furnace to pour out all the slag in the furnace, and ensure that the slag is poured out within 10 minutes. After quick slag dumping, lower the oxygen lance to a position 2.25m away from the furnace bottom, confirm that the tension value of one of the steel wire ropes is 6.11t, and check the records to confirm that the initial tension value of the steel wire rope is 5.75t. After baking in the ove...

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PUM

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Abstract

The invention relates to a method for online rapid cleaning of converter lance bonded steel slag. The method comprises the following steps: after steel tapping of a converter is ended, rapidly pouring all slag in the converter, descending a lance into a hearth, adjusting the position of the lance, baking the lance bonded steel slag by utilizing the temperature in the converter hearth, opening oxygen, controlling the intensity of oxygen supply at 2.6 to 3.0 Nm<3>/min.t, scouring the red and hot steel slag on a lance body by virtue of high-speed oxygen sprayed by the lance and reflected by the converter bottom, and adding an appropriate amount of auxiliary materials such as light-burnt dolomite or green dolomite to avoid a slag scoured splash layer or a furnace liner refractory having mobility formed in the converter, so that on the premise of not damaging the converter liner, a purpose of melting and stripping the steel slag bonded to the lance body can be realized. By adopting the method, the converter lance bonded steel slag can be rapidly cleaned in an online manner, so that the influence time of a lance bonded accident is greatly reduced, the technical problem that the converter liner is eroded when the steel slag bonded to an outer layer steel pipe of the lance is cleaned can be effectively prevented, the labor intensity and the maintenance expense for repairing the lance are reduced, and the service life of the lance and the converter is prolonged.

Description

technical field [0001] The invention relates to an online method for rapidly cleaning steel slag stuck in a converter oxygen lance, and belongs to the technical field of converter steelmaking technology. Background technique [0002] Oxygen lance is one of the important equipment of top-blowing or top-bottom combined blowing converter. Its main function is to dephosphorize, decarburize, heat up and supply nitrogen to the molten pool after blowing is completed by supplying oxygen to the molten pool of the converter at a high speed. Splash slag to protect the lining of the converter; during blowing or slag splashing of the oxygen lance to protect the furnace, it is inevitable that steel slag will adhere to the steel pipe on the outer layer of the oxygen lance due to poor slag melting and metal splashing. Remove the adhered steel slag in time. With the increase of smelting furnaces, the slag on the outer steel pipe of the oxygen lance will become more and more, which will det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/46
CPCC21C5/462
Inventor 贾国生董进强高福彬唐文明肖步庆程迪范佳刘红艳
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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