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A method and device for gas-phase magnesium purification based on pure iron filter material

A filter material and pure iron technology, applied in the field of gas-phase magnesium purification based on pure iron filter material, can solve the problems of low preparation efficiency, low efficiency of magnesium purification, low yield of high-purity magnesium, etc.

Active Publication Date: 2021-05-04
国科镁业科技(河南)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain higher purity, the distillation method is generally carried out under vacuum conditions and at an evaporation temperature close to the melting point of Mg (650-700 ° C), so its preparation efficiency is low; the purity of crystalline magnesium in different temperature zones is different, generally only at a suitable temperature. The crystalline magnesium is high-purity magnesium, so its high-purity magnesium yield is low; in order to obtain ultra-high-purity magnesium (99.999%-99.9999%), multiple distillations are required, so the cost is very high
Based on the above reasons, the vacuum distillation method cannot meet the needs of industrialized large-scale production.
[0005] In addition, the method of purifying magnesium in the prior art also has a method of using filter material to assist impurity removal by vapor deposition, but generally the filter material uses stainless steel fiber or the method of combining stainless steel fiber with copper fiber, and stainless steel is not suitable for the environment where the magnesium vapor pressure is too high. Working conditions, suitable for low heating temperature - low temperature sublimation conditions, so the efficiency of magnesium purification is low, and the output of high-purity magnesium is extremely low

Method used

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  • A method and device for gas-phase magnesium purification based on pure iron filter material
  • A method and device for gas-phase magnesium purification based on pure iron filter material
  • A method and device for gas-phase magnesium purification based on pure iron filter material

Examples

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Effect test

Embodiment 1

[0068] Such as figure 2 As shown, a device for purifying gas-phase magnesium containing pure iron filter material includes an electric furnace body 1, a crucible 2, a heating mechanism 3, a thermocouple 4 and a vacuum mechanism 5;

[0069] The crucible 2 includes a reaction zone 21, an impurity condensation zone 22 and a crystallization zone 23 arranged in sequence,

[0070] The reaction zone 21 is provided with a hopper 211,

[0071] The impurity condensation area 22 is provided with a filter assembly 221,

[0072]The filter assembly 221 is provided with a filter material, the filter material is pure iron, the filter material is metal iron foam, the pore diameter of the iron foam is 100ppi, and the purity of the iron is more than 99.2%;

[0073] The crystallization zone 23 is provided with a crystallizer 231;

[0074] The heating mechanism 3 includes a first heating assembly 31, a second heating assembly 32 and a third heating assembly 33; the first heating assembly 31 he...

Embodiment 2

[0081] A gas-phase magnesium purification device comprising a pure iron filter material is different from Example 1 in that the pore size of the foam metal iron is 30ppi, and the filter assembly 221 is arranged between No. 5 and No. 6 high-purity graphite pipes.

Embodiment 3

[0083] A gas-phase magnesium purification device comprising a pure iron filter material is different from Example 1 in that the filter material is iron fiber, and the iron fiber has a pore size of 100-400 mesh.

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Abstract

The invention provides a gas-phase magnesium purification method based on a pure iron filter material. The method uses a pure iron filter material to filter magnesium vapor. On the one hand, pure iron will not react with magnesium vapor and will not bring new impurities to the system; on the other hand, the impurities Al and Mn in magnesium vapor have special affinity with iron and can form a stable solid solution with iron ; At the same time, pure iron can be used as the nucleation site of some impurities in the magnesium vapor, lowering the nucleation energy barrier, allowing some impurities to deposit in advance, and removing impurities. The method provided by the invention can be applied to industrial large-scale gas-phase magnesium purification, and the production efficiency of magnesium purification can be increased by an order of magnitude by increasing the temperature, so that the content of impurity Mn in the magnesium raw material is reduced to below 10 ppm, and the content of Al is reduced to below 10 ppm. The Ca content is reduced to below 20ppm, and at the same time, non-metallic impurity elements such as F, Cl, and S can be removed to obtain magnesium with a purity of more than 99.99%.

Description

technical field [0001] The invention belongs to the technical field of metal magnesium purification, and in particular relates to a method and device for gas-phase magnesium purification based on a pure iron filter material. Background technique [0002] Magnesium and magnesium alloys are the lightest metal structural materials, and their density is about two-thirds of that of aluminum alloy and one-fifth of that of steel. Therefore, one of the important applications of magnesium alloys is energy saving and weight reduction in the automotive industry, rail transit and other fields. In addition, magnesium alloy also has the advantages of good electromagnetic shielding performance and excellent biocompatibility, and has bright application prospects in more functional fields. At present, in the field of magnesium purification, there are chronic problems such as low overall product purity (only 99.90%), many types of impurity elements (mainly containing Mn, Al, Ca, Si, Fe, Ni, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/02C22B26/22
CPCC22B9/023C22B26/22
Inventor 单智伟杨博刘博宇毛路遥王安
Owner 国科镁业科技(河南)有限公司
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