A method and device for gas-phase magnesium purification based on elemental silicon filter material

A technology of elemental silicon and filter material, applied in the direction of improving process efficiency, can solve the problems of inability to remove certain or certain impurities, the overall purification effect is limited, and the efficiency of magnesium purification is low, so as to simplify production. Process flow, reduce nucleation energy barriers, and improve production efficiency

Active Publication Date: 2021-09-17
国科镁业科技(河南)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patents CN203429230U, CN208562489U, and CN201024206Y mention that a "capture device", "interceptor" or "filter" is set at the mouth of the Pidgeon method reduction tank, and some special geometric structures are set at the mouth of the Pidgeon method reduction tank to intercept dust or some Pre-condensate, but the overall purification effect is limited, let alone remove one or several impurities in a targeted manner
[0006] 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 elemental silicon filter material
  • A method and device for gas-phase magnesium purification based on elemental silicon filter material
  • A method and device for gas-phase magnesium purification based on elemental silicon filter material

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Embodiment 1

[0070] like figure 2 Described, a device for gas phase magnesium purification containing elemental silicon filter material, comprising an electric furnace body 1, a crucible 2, a heating mechanism 3, a thermocouple 4 and a vacuum mechanism 5;

[0071] The crucible 2 includes a reaction zone 21, an impurity condensation zone 22 and a crystallization zone 23 which are arranged in sequence,

[0072] The reaction zone 21 is provided with a hopper 211,

[0073] The impurity condensation zone 22 is provided with a filter assembly 221,

[0074] The filter assembly 221 is provided with a filter material, the filter material is elemental silicon particles, and the particle size of the elemental silicon particles is 0.1-10 mm;

[0075] The crystallizing zone 23 is provided with a crystallizer 231;

[0076] The heating mechanism 3 is placed inside the electric furnace body 1 to heat the crucible 2;

[0077] The vacuum mechanism 5 includes a vacuum chamber 51, a water-cooled flange 52,...

Embodiment 2

[0080] like image 3 As shown, a device for gas-phase magnesium purification containing elemental silicon filter material includes an electric furnace body 1, a crucible 2, a heating mechanism 3, a thermocouple 4 and a vacuum mechanism 5;

[0081] The crucible 2 includes a reaction zone 21, an impurity condensation zone 22 and a crystallization zone 23 which are arranged in sequence,

[0082] The reaction zone 21 is provided with a hopper 211,

[0083] The impurity condensation zone 22 is provided with a filter assembly 221,

[0084] The filter assembly 221 is provided with a filter material, the filter material is elemental silicon particles, and the particle size of the elemental silicon particles is 5-10 mm;

[0085] The crystallizing zone 23 is provided with a crystallizer 231;

[0086] The heating mechanism 3 is placed inside the electric furnace body 1 to heat the crucible 2;

[0087] The heating mechanism 3 includes a first heating assembly 31, a second heating asse...

Embodiment 3

[0094] Utilize the device of embodiment 1 to realize the method for gas-phase magnesium purification based on elemental silicon filter material, comprising the following steps:

[0095] The industrial crude magnesium is placed in the hopper 211, the heating mechanism 3 is turned on, the temperature of the heating mechanism 3 is set to 1000 ° C, the raw material is reduced, the magnesium raw material is changed into magnesium vapor and then kept for 40 minutes, the vacuuming assembly 54 is turned on, and the crucible 2 is kept in the The vacuum degree is 20Pa. At this time, since the elemental silicon filter material is placed in the impurity condensation zone 22 in the crucible 2, the corresponding temperature range is 700-1000 ° C. After the reaction, the high-purity magnesium on the crystallizer 231 is collected.

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Abstract

The invention provides a gas-phase magnesium purification method based on an elemental silicon filter material. The method uses an elemental silicon filter material to filter magnesium vapor. Within a certain range of temperature and vacuum, elemental silicon does not react with magnesium vapor on the one hand, and will not bring new impurities to the system; on the other hand, Ca, Al, and Mn in elemental silicon and magnesium vapor have special properties. Affinity can form a more stable solid solution with silicon; at the same time, elemental silicon can be used as the nucleation site of impurities in 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 large-scale industrialized 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 Mn content of impurities in the magnesium raw material can be reduced to below 4ppm, and the Al content can be reduced to below 10ppm. The Ca content drops below 10ppm, and the purity of the obtained magnesium is above 99.99%.

Description

technical field [0001] The invention belongs to the technical field of metal magnesium purification, in particular to a method and a device for gas-phase magnesium purification based on elemental silicon filter material. Background technique [0002] Magnesium alloy has the advantages of low density, strong damping and shock absorption, excellent electromagnetic shielding performance and relatively low recycling cost, so it is regarded as "21st century green environmental protection engineering structural material" and an important strategic material. At present, in the field of magnesium purification, there are chronic diseases such as low overall product purity (only 99.90%), many types of impurity elements (mainly including Mn, Al, Ca, Si, Fe, Ni, etc.), and large content fluctuations. These chronic diseases seriously deteriorate the performance of magnesium alloys, which in turn leads to their practical application being far less than expected. [0003] At present, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/22C22B9/02
CPCC22B9/023C22B26/22Y02P10/20
Inventor 单智伟侯岳显杨博刘博宇张朋诚王安毛路遥
Owner 国科镁业科技(河南)有限公司
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