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Process for regenerating used Mg-alloy

A technology of waste materials and magnesium alloys, which is applied in the field of metal materials and metallurgy, can solve the problems that fluxes are difficult to obtain magnesium alloys, fluxes are easy to pollute molten metal, and operations are complicated, achieving huge economic and social benefits and broad application prospects , low cost effect

Inactive Publication Date: 2004-11-24
SHANGHAI HAOHUA MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The distillation method is based on the principle of different vapor pressures of impurities in magnesium. This method is complicated to operate and consumes a lot of energy. The recovered product is pure magnesium, which is not suitable for recycling magnesium alloy waste. The flux method is the most commonly used recovery method for magnesium alloy waste. The flux method is suitable for magnesium alloy scraps with oil, release agent, lubricant, corrosion, pollution and surface treatment attached to the surface
However, the flux is easy to pollute the regenerated molten metal, resulting in flux slag inclusions, and it is difficult to obtain high-quality magnesium alloys only with flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Bake ZMgAl8Zn die-casting waste at 200°C for 3 hours, then put it into a crucible furnace to melt and heat up to 740°C, sprinkle 3% JDMJ refining agent on the liquid surface continuously, and stir up and down at the same time to circulate the magnesium liquid to prolong the solvent life. The flow of liquid droplets increases the chance of contact and adsorption between flux and oxidized inclusions, and usually keeps for about 10 minutes until the liquid surface becomes a bright mirror surface. Stand still for 10 minutes, after removing the slag, blow 99.99% argon for 30 minutes, and then cast at 710°C with a magnesia foam ceramic filter with a porosity of 80%. The inclusions above 15μm in the magnesium melt are basically removed, and it is used for the ZMgAl8Zn magnesium alloy. The tensile strength of the metal type sample is above 186.1MPa, and the elongation is 4.8%. It has reached the performance index of ZMgAl8Zn new material.

Embodiment 2

[0011] Bake ZMgAl8Zn die-casting waste at 250°C for 2 hours, then put it into a crucible furnace to melt and heat up to 750°C, sprinkle 2% JDMJ refining agent on the liquid surface continuously, and stir up and down at the same time to circulate the magnesium liquid to prolong the solvent life. The flow of liquid droplets increases the chance of contact and adsorption between flux and oxidized inclusions, and usually keeps for about 10 minutes until the liquid surface becomes a bright mirror surface. Stand still for 10 minutes, after removing slag, blow 99.999% argon gas for 25 minutes, and then cast at 720°C with a magnesia foam ceramic filter with a porosity of 85%. Inclusions above 20μm in magnesium melt are basically removed, and it is used for ZMgAl8Zn magnesium alloy. The tensile strength of the metal type sample is above 180.9MPa, and the elongation is 4.1%. It has reached the performance index of ZMgAl8Zn new material.

Embodiment 3

[0013] Bake ZMgAl8Zn die-casting waste at 250°C for 3 hours, then put it into a crucible furnace to melt and heat up to 745°C, sprinkle 3.5% RJ2 flux on the liquid surface continuously, and stir up and down at the same time to circulate the magnesium liquid to prolong the solvent liquid. The process of dripping increases the chance of contact and adsorption between flux and oxidized inclusions, and usually keeps for about 10 minutes until the liquid surface becomes a bright mirror surface. Stand still for 10 minutes, after removing slag, blow in 99.999% argon for 30 minutes, and then cast at 710°C with a magnesia foam ceramic filter with a porosity of 90%. Inclusions above 20μm in magnesium melt are basically removed, and it is used for ZMgAl8Zn magnesium alloy. The tensile strength of the metal type sample is above 179.6MPa, and the elongation is 3.9%. It has reached the performance index of ZMgAl8Zn new material.

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Abstract

A process for regenerating used Mg alloy includes such steps as refining the molten Mg with the refining agent JDMJ or flux RJ2, blowing 99.9-99.999% argon gas for cleaning it and filtering by MgO foam ceramic filter having 70-95% of porosity.

Description

Technical field: [0001] The invention relates to a process for purifying and regenerating old magnesium alloy materials, in particular to a composite multi-stage purification process using flux purification, air blowing purification and filtration purification. It belongs to the field of metal materials and metallurgy. Background technique: [0002] Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, good damping performance, and electromagnetic shielding, and has become an important lightweight material in the automotive and electronics industries in recent years. With the increasing application of magnesium metal in industry, higher requirements are put forward for the purity of magnesium. On the other hand, since the material utilization rate of magnesium alloy die castings is not high, generally only about 30-50%, a large amount of waste will be generated during the die casting production process, and scrapped magnesium allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22C1/02C22C23/00
CPCY02P10/20
Inventor 吴国华曾小勤卢晨彭立明丁文江
Owner SHANGHAI HAOHUA MOLD