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Device and method for spraying carbon to deoxidize by using slag stopping system

A technology of carbon injection and slag blocking cone, which is applied in the direction of manufacturing converters, etc., can solve the problems of nozzle erosion, shorten the service life of the tapping hole, increase the tapping hole and other problems, so as to solve the construction difficulty, reduce the construction difficulty and ensure the The effect of reliability

Active Publication Date: 2021-01-15
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process, the contact between the nozzle and the high-temperature molten steel causes rapid erosion of the nozzle, shortens the service life of the tap hole, and increases the risk of steel leakage at the tap hole. Frequent replacement of the tap hole causes a decrease in the operation rate of the converter; After carbon spraying, the returning molten steel and steel slag will block the nozzle in the lower part, causing the carbon spraying system to fail to operate normally

Method used

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  • Device and method for spraying carbon to deoxidize by using slag stopping system
  • Device and method for spraying carbon to deoxidize by using slag stopping system

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Embodiment 1

[0044] like figure 1 , figure 2 As shown, a device for carbon spraying and deoxidation using a slag blocking system, including a slag blocking cone truck arm 1 and a slag blocking cone 6, and a powder delivery pipeline 2 and a clamping device are provided inside the slag blocking cone truck boom 1 pipeline 5. The position of the slag blocking cone 6 is fixed by the clamping device 5 , and the front end of the powder conveying pipeline 2 is connected to one end of the rotary joint 3 .

[0045] The center of the slag blocking cone 6 is a single-layer nozzle with a clamping slot 12. The slag blocking vehicle and the slag blocking cone pass through the powder delivery pipeline 2 in the middle of the boom and the spray pipe 14 at the center of the slag blocking cone. The joint 3 is closely matched, the cone head 13 is positioned by clamping the outer pipe 10 of the slag-stopping cone rod, and the head of the central pipe is connected with the outer pipe by spot welding.

[0046]...

Embodiment 2

[0055] In this embodiment, the method is applied to 100 tons of steelmaking. The inner diameter of the injection pipe in the slag blocking cone and cone rod is 16 mm. The deoxidizing powder uses carbon powder with a diameter of less than 1 mm. Kind of HRB400E, select the carrier gas as nitrogen, and the injection powder as carbon powder.

[0056] A method for deoxidizing by carbon spraying using a slag blocking system, comprising the following steps:

[0057] Step 1) According to the control of 0.07% carbon content at the end point of the converter end point prediction system, the oxygen content of molten steel according to previous data statistics is 530ppm. Calculated at 280ppm, the oxygen content to be removed is 250ppm, the amount of carbon powder to be injected is controlled at 1.4kg / t, and 140kg of carbon powder after weighing is added to the powder spray tank, combined with the effective time of spraying on the furnace and the injection material Volume, preset powder i...

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Abstract

The invention discloses a device for spraying carbon to deoxidize by using a slag stopping system. The device comprises an injection tank, a specially-made slag stopping cone vehicle and a specially-made slag stopping cone, a fluidistor is installed on the lower portion of the injection tank, powder is driven by main blowing gas after being fluidized and passes through a pipeline in the middle ofa large arm of the slag stopping cone vehicle and a rotary joint at the tail end of the pipeline, finally, the powder enters molten steel through an injection pipeline in the center of the specially-made slag stopping cone, a powder conveying pipeline in the middle of a large arm of the slag stooping cone is in close fit with the injection pipe in the center of the slag stopping cone through the rotary joint, and positioning is carried out on a slag stopping cone vehicle clamping head by clamping an outer pipe of a slag stopping cone rod, so that positioning of the slag stopping cone in the injection process is guaranteed. According to the method, online powder spraying deoxidation in the steelmaking and tapping process is realized, the initial oxygen content of the molten steel before reaching a steel ladle is reduced, the usage amount of deoxidized alloy and the generation of deoxidized inclusions are reduced, the yield of high-value alloy is increased, and a good foundation is laidfor improving the product quality.

Description

technical field [0001] The invention belongs to the technical field of steelmaking production, and in particular relates to a device and method for carbon spraying and deoxidation of a slag retaining system. Background technique [0002] The converter steelmaking process adopts oxygen supply technology for smelting, especially for smelting low-phosphorus steel. In order to control the phosphorus below 50ppm, it is necessary to add supplementary blowing in the later stage to strengthen dephosphorization, resulting in a sharp increase in the oxygen content in molten steel, even reaching more than 800ppm , resulting in severe peroxidation of molten steel. In order to control the oxygen content in molten steel and provide good conditions for refining, deoxidation is required during the tapping process of the converter. In the actual production process, most of them directly put block ferrosilicon alloy, silicon-manganese alloy, silicon-calcium-barium, etc. into the tapping ladle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/46C21C7/06
CPCC21C5/46C21C7/06C21C7/0043Y02P10/20
Inventor 魏国立朱青德胡绍岩李伟峰张英嘉妥建德蒋心泰
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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