Method of melting magnesium and melting apparatus

A melting device and melting furnace technology, applied in the field of molten metal, can solve problems such as lack of reliability, and achieve the effect of automatic control of the supply of flame retardants

Inactive Publication Date: 2008-01-16
NIPPON SANSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, it is difficult to confirm the combustion of magnesium in a short time after the start of combustion in the detection of white smoke, the temperature rise of the molten metal, and the temperature rise in the melting furnace, and it is also lacking in reliability.

Method used

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  • Method of melting magnesium and melting apparatus
  • Method of melting magnesium and melting apparatus
  • Method of melting magnesium and melting apparatus

Examples

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experiment example

[0070] The setup shown in Figure 1 was used. The melting furnace 1 has an inner diameter of 300 mm and a height of 670 mm. The interior can be observed through the heat-resistant glass window installed on the furnace cover.

[0071] A crucible 2 having an inner diameter of 200 mm and a height of 300 mm is arranged in the melting furnace 1 . A molten metal obtained by melting 4.7 kg of a magnesium alloy (AD91D) was placed in the crucible 2, and its temperature was maintained at 680°C.

[0072] As the protective gas, 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone, which is a flame retardant, was diluted to 200ppm with carbon dioxide. . The shielding gas was supplied from the pipe 7 to the melting furnace 1 at a rate of 7.5 liters / minute.

[0073] The carbon monoxide concentration in the gas in the melting furnace 1 is measured by the sensor 4 and the carbon monoxide concentration meter 5 .

[0074] FIG. 3 shows the change with time of the carbon monoxide conce...

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Abstract

An object of the present invention is to provide a melting method for magnesium or a magnesium alloy which detects certainly and immediately combustion of a magnesium melt and emits alarm immediately based on the detection results, and extinguishes immediately the magnesium combustion, in order to achieve the object, the present invention provide a method for melting magnesium while supplying a cover gas containing carbon dioxide and a fireproof agent in a furnace for melting magnesium and obtaining a magnesium melt to cover the surface of the magnesium melt, wherein concentration of carbon monoxide in the furnace or gas discharged from the furnace is measured and magnesium combustion in the furnace is detected based on the concentration of carbon monoxide.

Description

technical field [0001] The present invention relates to a melting method and melting device for melting magnesium or magnesium alloy to obtain molten metal, capable of detecting combustion on the surface of molten metal of magnesium or magnesium alloy, and capable of rapidly extinguishing the burning. [0002] This application claims priority based on Japanese Patent Application No. 2005-012580 filed on January 20, 2005, the contents of which are incorporated herein by reference. Background technique [0003] So far, magnesium or magnesium alloys have been melted in a melting furnace (hereinafter, in the description of the present application, magnesium and magnesium alloys are combined and described as magnesium.) When obtaining a molten metal, in order to prevent the combustion of magnesium on the surface of the molten metal, use Protective gas (cover gas) covers the molten metal near the surface. [0004] As the shielding gas, a flame retardant such as sulfur hexafluorid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/16B22D21/04
CPCC22B9/003C22B9/006B22D21/007C22B26/22Y02P10/25B22D21/04C22B9/16
Inventor 讃井宏野村祐司加藤徹中村通
Owner NIPPON SANSO CORP
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