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A continuous flux melting method and device for magnesium and magnesium alloys

A magnesium alloy and flux technology, applied in the field of smelting methods and devices, can solve the problems of lack of heat transfer mechanism, prolong stirring and refining time, and inability to operate continuously, so as to avoid excessive pollution and waste, eliminate plant equipment corrosion, and eliminate moisture absorption The effect of loss

Active Publication Date: 2017-10-13
重庆硕龙科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, although the method realizes continuous operation in the casting process, the process of melting and refining the charge is essentially a furnace-type production, which is completely different from the continuous operation method of the present invention.
[0007] 3. The melting process is slow: after the flux method melting crucible is filled, the melting process of the charge depends entirely on the heat transfer from the molten flux at the bottom of the crucible to the solid accumulation charge, which is limited by the low proportion of flux and the distance from the crucible wall to the central area of ​​the crucible. Limited by factors such as length and lack of convective heat transfer mechanism in the molten pool, the first half of the melting of the charge is very slow
[0009] 4. Unsatisfactory refining effect: As we all know, the refining effect of flux method smelting depends on the contact probability between flux and solid inclusions in the melt. In the current flux refining process, the contact between flux and melt inclusions depends entirely on mechanical stirring intensity and duration
Because the melting pool in the crucible is much larger than the range of action of the mechanical stirring device, it cannot provide conditions for effective contact between the flux and the inclusions in the melt during the stirring process, resulting in low purification efficiency. In order to improve the refining efficiency, the stirring and refining time has to be extended
[0010] 5. Release of corrosive gas: during flux smelting, magnesium chloride (MgCl) in the molten flux in the open crucible 2 ) and water vapor in the air (H 2 O) and oxygen (O 2 ) react and release corrosive gases HCl and Cl 2 , these gases not only deteriorate the working environment, but also lead to rapid corrosion of plant and equipment
[0011] 6. Flux emission pollution: In the smelting process of furnace-type flux method, the slag content in the flux will become higher and higher with the prolongation of use time
Engineering applications show that flux refining is still an effective medium for purifying magnesium and magnesium alloy melts, and is especially suitable for remelting and refining furnace materials with high impurities and high dust content. There are key technical problems such as unstable effects and continuous operation, but no comprehensive solution has been seen so far

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  • A continuous flux melting method and device for magnesium and magnesium alloys
  • A continuous flux melting method and device for magnesium and magnesium alloys

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0045] Coarse magnesium produced by the silicothermal reduction process generally has a loose outer layer of "dust + magnesium particles" and an inner layer of "crystalline magnesium" ( figure 1 ) structural characteristics, the thermal resistance of the surface layer is high and does not infiltrate with the melt, and there is a technical bottleneck of refractory melting, combined below figure 2 The application of the present invention in refining production of crude magnesium is introduced. The implementation device includes the following main components ( figure 2 ): crucible 3, melting chamber 4, flux filter 5, flux circulation purification pump 6, flux slag port 7, feed port 8, refining air pipe 9 and melting-promoting refining pump 10.

[0046] The crude magnesium charge is fed into the melting chamber 4 of the built-in molten flux crucible 3 through...

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Abstract

The invention relates to a continuous flux smelting method and device for magnesium and magnesium alloys, which is suitable for continuous smelting of magnesium and magnesium alloys with high-impurity and high-dust-content charge as main raw materials. In the invention, the built-in melting-promoting refining pump sucks the high-temperature melt from the upper part of the molten pool and the flux from the bottom of the crucible, and mixes with the refining gas in the pump and then sprays it out from the outlet. At the same time of compound refining, the melt in the crucible is driven to do macroscopic circulation convection, which not only promotes the melting of the furnace charge, but also realizes the uniform temperature and homogeneity of the melt in the crucible; the flux circulation purification pump is used to pump out the flux containing slag at the bottom of the crucible It is sucked to the upper surface of the molten pool, and after filtering and separating the molten slag, it flows to the surface of the crucible molten pool to provide flame retardancy, and then settles to the bottom of the crucible with the furnace charge. The above functions are carried out in parallel and uninterruptedly under the sealing of the furnace cover, which realizes the efficient, green and continuous flux melting of magnesium and magnesium alloys.

Description

technical field [0001] The invention relates to a smelting method and device, in particular to a continuous flux smelting method and device suitable for magnesium and magnesium alloys, and belongs to the field of metal smelting and processing thereof. Background technique [0002] Since the 1990s, magnesium has become another important light alloy material after aluminum. With the development of the magnesium alloy industry and the wide application of magnesium alloy products, the purity of magnesium and magnesium alloy materials (purity refers to the degree of impurity elements in the alloy, and clarity refers to the content of non-metallic impurities (including gases) in the alloy High and low) and its reproducibility have put forward higher and higher requirements, that is, higher and higher requirements have been put forward for the smelting technology of magnesium. At present, the widely used magnesium alloy smelting method is the furnace-type flux method; in order to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C23/00C22B26/22
Inventor 龙思远黄彦彦
Owner 重庆硕龙科技有限公司
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