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Nickel removing method for magnesium alloy

A magnesium alloy, nickel content technology, applied in the field of magnesium alloy nickel removal, can solve the problem of no mention of magnesium alloy nickel removal scheme, difficulty in controlling the aluminum content of magnesium alloy, reducing the scope of use of magnesium alloy, etc., to achieve expanded reuse range, short response time, and simple operation

Inactive Publication Date: 2014-10-01
HUNAN S R M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Only studies have disclosed that when titanium reagents are used to remove impurities such as iron and silicon, it may have a partial nickel removal effect. For example, copper and part of nickel in the magnesium alloy melt may precipitate together with iron into the "Al-Mn-Fe phase" However, in addition to the pure magnesium dilution method, the industry has not yet found a practical and effective method for removing copper and nickel elements in magnesium alloys (Han Jingyan et al., Improving the casting quality of magnesium and its alloys Technical Measures[J]. Light Alloy Processing Technology, 2013,41(9):16-18,39)
There are also documents disclosing that adopting zirconium can make the nickel content in pure magnesium drop from 2% to 0.2%, and adopting zirconium and aluminum simultaneously can make the nickel content in the magnesium melt drop from 0.2% to below 0.001%; ​​but The common element aluminum and potassium fluorozirconate to remove nickel, that is, the introduction of aluminum during the processing of magnesium alloys will lead to difficult control of the aluminum content in magnesium alloys, reducing the scope of use of magnesium alloys (Yang Mingbo et al., Magnesium alloy waste recycling technology Status and progress[J].Casting,2005,54(5):420-424)
[0006] To sum up, in the prior art, most researches are on inclusions, gas inclusions, and impurity elements—iron, silicon, copper, etc., which have the most serious impact on the performance of magnesium alloys. However, the reagents specially used to remove nickel and the corresponding industrial methods for removing nickel have not yet made effective progress, and the investment is too high, so they are not suitable for industrial production.
In addition, the content about nickel removal disclosed in the prior art - the use of titanium reagent / potassium fluorozirconate to remove nickel, does not mention a set of nickel removal schemes for magnesium alloys that can be used for reference

Method used

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  • Nickel removing method for magnesium alloy
  • Nickel removing method for magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) carry out spectroscopic analysis to the complete magnesium alloy melt sampling of melting, Ni content is 0.082%;

[0037] (2) The weight of magnesium alloy melt is 2800kg, set the Ni content to 0.05%, weigh 4.3kg K 2 ZrF 6 ,spare;

[0038] (3) The above prepared 4.3kg K 2 ZrF 6 Mix evenly with the flux used for magnesium alloy refining;

[0039] (4) Keep the temperature of the metal melt at 725° C., add the above-mentioned uniformly mixed flux, and stir mechanically for 15 minutes;

[0040] (5) the slag that sinks into the bottom of the crucible after the above-mentioned reaction is pulled out;

[0041] (6) sampling, spectral analysis Ni content is 0.057%;

[0042] (7) Weigh 3.4kgTiF 4 ,spare;

[0043] (8) the TiF prepared above 4 Add the magnesium alloy melt during the alloying process and fully stir for 15 minutes;

[0044] (9) the above-mentioned fully reacted magnesium alloy melt was left to stand for 35 minutes;

[0045] (10) Sampling and analyzing t...

Embodiment 2

[0048] (1) carry out spectroscopic analysis to the complete magnesium alloy melt sampling of melting, Ni content is 0.103%;

[0049] (2) The weight of the magnesium alloy melt is 2500kg, set the Ni content to 0.05%, weigh 6.2kg K 2 ZrF 6 ,spare;

[0050] (3) The above prepared 6.2kg K 2 ZrF 6 Mix evenly with the flux used for refining;

[0051] (4) Keep the temperature of the metal melt at 728° C., add the above-mentioned homogeneously mixed flux, and stir mechanically for 18 minutes;

[0052] (5) the slag that sinks into the bottom of the crucible after the above-mentioned reaction is pulled out;

[0053] (6) sampling, spectral analysis Ni content is 0.065%;

[0054] (7) Weigh 3.4kgTiF 4 ,spare;

[0055] (8) the TiF prepared above 4 Add the magnesium alloy melt during the alloying process and fully stir for 18 minutes;

[0056] (9) the above-mentioned fully reacted magnesium alloy melt was left to stand for 32 minutes;

[0057] (10) Sampling and analyzing the above...

Embodiment 3

[0060] (1) carry out spectroscopic analysis to the complete magnesium alloy melt sampling of melting, Ni content is 0.097%;

[0061] (2) The weight of magnesium alloy melt is 2580kg, set the Ni content to 0.05%, weigh 5.8kg K 2 ZrF 6 ,spare;

[0062] (3) The above prepared 5.8kg K 2 ZrF 6 Mix evenly with the flux used for refining;

[0063] (4) Keep the temperature of the metal melt at 720° C., add the above-mentioned uniformly mixed flux, and stir mechanically for 20 minutes;

[0064] (5) the slag that sinks into the bottom of the crucible after the above-mentioned reaction is pulled out;

[0065] (6) sampling, spectral analysis Ni content is 0.042%;

[0066] (7) Weigh 2.3kgTiF 4 ,spare;

[0067] (8) the TiF prepared above 4 Add the magnesium alloy melt during the alloying process and fully stir for 20 minutes;

[0068] (9) the above-mentioned fully reacted magnesium alloy melt was left to stand for 30 minutes;

[0069] (10) Sampling and analyzing the above magnesi...

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Abstract

The invention provides a nickel removing method for magnesium alloy. The nickel removing method comprises the following steps: quantitative potassium fluozirconate is adopted to react with the magnesium alloy for the first nickel removing reaction; the quantitative titanium tetrafluoride is adopted to react with the magnesium alloy for the second nickel removing reaction, wherein the mass ratio of nickel in the potassium fluozirconate to the magnesium alloy is 3-4 to 1; the mass ratio of nickel in the titanium tetrafluoride and the magnesium alloy is 2-3 to 1. Compared with the prior art, the nickel removing method for the magnesium alloy provided by the invention has the advantages that the operation is simple, the reaction time is short, the cost is lower, no special requirement for equipment is needed and the method is suitable for industrial production; the nickel content in the magnesium alloy treated by the method is not greater than 0.001%; compared with nickel removing methods in the prior art, remarkable improvement is achieved in the invention; the technical problem that the nickel content exceeds the standard in the magnesium alloy production or magnesium alloy waste recycling process is solved and the range of the magnesium alloy production or magnesium alloy waste recycling is further expanded.

Description

technical field [0001] The invention belongs to the technical field of metal refining and impurity removal, and relates to a method for refining and removing impurities from magnesium alloys, in particular to a method for removing nickel from magnesium alloys. Background technique [0002] As a commercial metal engineering structural material, magnesium or magnesium alloy has the advantages of low density, high specific strength and specific stiffness, strong damping, vibration and noise reduction capabilities, excellent electromagnetic shielding performance, and easy recycling. It is known as the "21st century" Green Structural Materials". Therefore, in recent years, magnesium or magnesium alloys have been used more and more widely in the fields of automobiles, aerospace, computers, communications, etc., with an average annual growth rate of more than 10%. [0003] The production method of magnesium alloy in the prior art is mainly by adding part of alloy or magnesium allo...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C23/00
Inventor 谭何易黄芳唐伦圆
Owner HUNAN S R M SCI & TECH
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