Method for injecting add-in material for molten metal and device for injecting add-in material for molten metal

A technology for adding materials and molten metal, which is applied in the field of adding materials for molten metal and adding materials for molten metal, and can solve the problems of time required for putting in insulation materials and limitations in operation methods, etc.

Inactive Publication Date: 2018-08-28
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of the method of inserting the insulating material by manual operation, the input of the insulating material takes time
In addition, the molten steel transferred from the converter to the container has a high temperature of 1,600°C or higher, so there is a limit to the method of working with personnel close to the molten steel.

Method used

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  • Method for injecting add-in material for molten metal and device for injecting add-in material for molten metal
  • Method for injecting add-in material for molten metal and device for injecting add-in material for molten metal
  • Method for injecting add-in material for molten metal and device for injecting add-in material for molten metal

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Experimental program
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Embodiment Construction

[0042] The present inventors conducted various experiments on a method of uniformly supplying a heat insulating material to the surface of molten steel in a container without a lid. First, a test was conducted in which a nozzle with a discharge port formed at the lower end was placed above the surface of molten steel in an uncapped container, and an insulating material was blown from the discharge port of the nozzle to the surface of molten steel with a carrier gas. The diameter of the opening of the container is 3.0 m or more. At this time, the discharge port of the nozzle is directed vertically downward.

[0043] As a result, when the distance in the height direction from the upper end of the container to the discharge port of the nozzle (hereinafter also referred to as "nozzle height") is greater than 1.2 m, it is as follows. That is, if the amount of heat insulating material used is increased to the extent that the heat insulating material can be uniformly supplied to the m...

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Abstract

Provided is a method for introducing an add-in material to a container containing molten metal, the method including a nozzle disposition step for disposing nozzles above the molten metal contained inthe container, and an add-in material ejection step for conveying the add-in material to the nozzles by means of a carrier gas and ejecting the add-in material from ejection ports of the nozzles, wherein the area of the ejection ports is greater than the area of introduction ports of the nozzles. As a result of the injection method, the add-in material is evenly supplied onto the surface of the molten metal contained in the container and both a sufficient additive effect due to the add-in material and a reduction in the usage amount of the add-in material can be achieved.

Description

technical field [0001] The present invention relates to a method for feeding additive materials such as thermal insulation materials into a container containing molten metal such as molten steel and an additive material feeding device in the manufacturing process of metal, for example, in the process of steelmaking. More specifically, it relates to the use of An additive material input method and an additive material input device for injecting additive material into a container from a nozzle. Background technique [0002] After appropriate preliminary treatment is performed on molten iron produced in a blast furnace, decarburization treatment and temperature raising treatment are performed using a converter so that it becomes molten steel at about 1600°C. The molten steel is subjected to component adjustment and degassing treatment using a secondary refining facility. The molten steel that has passed through such a steelmaking process is solidified using a continuous castin...

Claims

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Application Information

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IPC IPC(8): B22D27/06B22D1/00B22D11/108
CPCB22D1/00B22D11/108B22D27/06B22D1/005B22D27/003
Inventor 松永邦俊中切孝夫
Owner NIPPON STEEL CORP
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