Method for smelting and purifying metal in electro-magnetism composite field and device thereof

Abstract

The present invention relates to process and apparatus for zone metal melting purification under composite electromagnetic field, and belongs to the field of technology of separating and purifying metal under electromagnetic field. The present invention features that metal or alloy containing mixed metal element is set inside one electromagnetic field comprising parallel magnetic field and electric field in electrically migrating zone melting apparatus, and under the cooperation of the magnetic field and the electric field, the mixed metal element migrates in phase grain form toward the negative pole and the metal or alloy in the lower end is purified. The present invention adopts magnetic field intensity of 0.1-20 T, and DC current density of 10-100 A / aq cm.

Description

technical field [0001] The invention relates to a method and a device for purifying metal under an electromagnetic composite parallel static magnetic field, belonging to the technical field of metal separation and purification under the action of an electromagnetic field. Background technique [0002] Because electromigration technology can change the solute distribution coefficient in the solidification process, it can make the impurities in the metal with a solute distribution coefficient close to 1 directional migration after combining with the zone smelting technology, so it has always been regarded as one of the effective methods for preparing high-purity metals . However, it can only be used to purify a small amount of precious materials for a long time. One of the main reasons is that to obtain the effect of electromigration, the required current density usually reaches 10 3 A / cm 2 Above, this will lead to significant Joule heating effect, which will bring inconveni...

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Problems solved by technology

However, it can only be used to purify a small amount of precious materials for a long time. One of the main reasons is that to obtain the effect of electromigration, the required current density usually reaches 10 3 A / cm 2 Above, this will lead to significant Joule heating effect, which will bring inconvenience to the operation and process control of sample purification; in addition, due to the current-induced magnetic field and the formation of inhomogeneous electromagnetic force in the metal melt, turbulence is generated in the melt, This will significantly deteriorate the directional migration effect of impurity atoms; moreover, when purified by electromigration, due to the slow diffusion rate of impurity atoms, the period required for this technology to purify metals is relatively long

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