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Gas phase magnesium purification method and device based on pure iron filter material

A filter material and pure iron technology, which is applied in the field of gas phase magnesium purification based on pure iron filter material, can solve the problems that vacuum distillation method cannot meet industrialized large-scale production, low yield of high-purity magnesium, and low efficiency of magnesium purification, etc. The effect of lowering nucleation energy barrier, reducing cost and improving efficiency

Active Publication Date: 2020-01-24
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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  • Gas phase magnesium purification method and device based on pure iron filter material
  • Gas phase magnesium purification method and device based on pure iron filter material
  • Gas phase magnesium purification method and device based on pure iron filter material

Examples

Experimental program
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Effect test

Embodiment 1

[0068] like 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 heats...

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 the pure iron filter material to filter magnesium vapor, on one hand, the pure iron does not react with the magnesium vapor, and no new impurities are brought to the system; on the other hand, impurities Al, Mn and iron in the magnesium vapor have special affinity, and stable solid solution can be formed with iron; meanwhile, pure iron can be used as a site for nucleation of certain impurities in the magnesium vapor, so that the nucleation energy barrier can be reduced, the certain impurities can be deposited in advance, and impurities can be removed. The method can be applied to industrial large-scale gas phase magnesium purification, the production efficiency of magnesium purification is improved on the order of magnitude through increasing the temperature, the content of impurities Mn in the magnesium raw material is reduced to 10 ppm or below, the content of Al isreduced to 10 ppm or below, the content of Ca is reduced to 20 ppm or below, and meanwhile, non-metal impurity elements such as F, Cl and S can be removed to obtain the magnesium with the purity of 99.99% or above.

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 Applications(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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