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High-purity metal refining method for limiting molten zone by utilizing electromagnetic shielding

An electromagnetic shielding and melting zone technology, which is applied in the direction of improving process efficiency and energy efficiency, can solve the problems of lack of melting zone width and high-frequency electromagnetic field mutual interference, and achieve low cost, improved transmission efficiency, and simple production.

Active Publication Date: 2013-12-18
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you want to further improve the efficiency of regional melting, you need to consider the design of multiple melting zones, but there is still a lack of a means that can effectively limit the width of the melting zone and avoid mutual interference of high-frequency electromagnetic fields

Method used

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  • High-purity metal refining method for limiting molten zone by utilizing electromagnetic shielding

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Embodiment

[0025] According to the regional smelting method of the present invention, high-purity indium is refined, and its specific implementation steps are:

[0026] (1) Metal indium with a purity of 4N (99.99%) obtained by industrial electrolysis is smelted and cast into a metal rod, which is placed in a quartz boat 12 with a length of 370 mm and a clean surface.

[0027] （ 2) Place the quartz boat 12 in the quartz furnace tube 8 with a length of 700mm, and seal both ends of the quartz tube with a ground seal head to form an airtight structure; the seal is connected to the vacuum pump 7 and the high-purity argon gas with a vacuum hose The purification machine 3; the quartz furnace tube 8 is equipped with a quartz spiral cooling tube 6 for heat dissipation and auxiliary melting zone control.

[0028] （ 3) Connect the graphite separator 5 and the refractory ceramic bracket 4 together, place them on both sides of the induction heating coil 9 made of copper tubes, and keep the distance...

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Abstract

The invention discloses a high-purity metal refining method for limiting a molten zone by utilizing electromagnetic shielding. A zone melting device is of horizontal type, a heating power supply is a high-frequency induction power supply, a heat-resisting sealed tube quartz furnace tube is used as a furnace chamber, a metal raw material is placed in a quartz boat, a sealed isolation chamber is formed by adopting graphite clapboards for electromagnetic shielding, the width of the molten zone is strictly controlled, electromagnetic field interference among multiple molten zones is prevented simultaneously, and the zone melting device is allowed to be internally provided with two or more molten zone with adjustable width; heat dissipation of a cooling tube also plays a role in auxiliary control of the molten zones; a stepper motor numerical control platform is automatically controlled by adopting a computer to push the quartz furnace tube; and the combination of a high-purity argon purification machine and a vacuum pump is adopted to ensure an inert gas environment inside the quartz furnace tube and prevent pollution caused by atmosphere. The device adopted by the high-purity metal refining method is simple in structure, low in cost, stable to operate, and high in degree of automation, and the high-purity metal refining method is applicable to high-purity refining for low-melting-point metals such as indium, tin, bismuth, lead or zinc.

Description

technical field [0001] The invention relates to a high-purity metal extraction method using electromagnetic shielding to limit the melting zone, which is suitable for high-purity extraction of low-melting point metals such as indium, tin, bismuth, lead, and zinc. Background technique [0002] The purity of metals produced by industrial electrolysis is usually up to about 4N (99.99%), while metals meeting the needs of the electronics industry need to reach 6N (99.9999%) or even higher purity. The zone smelting method is a pyro-refining method that deeply purifies metals, metal compounds or changes the distribution of impurities in the metal ingot. Its essence is to form a narrow melting zone (referred to as the melting zone) by locally heating the long and narrow metal ingot. And make it move slowly along the ingot in a certain direction, and use the difference in the equilibrium concentration of impurities between the solid phase and the liquid phase to segregate the impurit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/00
CPCY02P10/25
Inventor 罗鲲李贻成章长生喻亮甘平乐卫和李小刚刘越
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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