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Purifying method for casting-smelting mag nesium alloy and air blowing apparatus thereof

An air blowing device and magnesium alloy technology are applied in the field of impurity purification to achieve the effects of reducing impurity content, reducing magnesium loss, and reducing human error

Inactive Publication Date: 2004-01-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an improved purification method for casting and smelting magnesium alloys and its air blowing device, so as to overcome the above-mentioned shortcomings of the current artificial throwing and removing flux, effectively improve the purity of smelting magnesium alloys, and greatly improve its casting performance. Improve product performance and quality, improve production conditions, and increase labor productivity

Method used

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  • Purifying method for casting-smelting mag nesium alloy and air blowing apparatus thereof
  • Purifying method for casting-smelting mag nesium alloy and air blowing apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Casting AM50 magnesium alloy, the raw materials are pure magnesium ingots, pure aluminum, pure zinc and Mn-Al alloys, which are melted in a melting furnace, and the alloy melt is blown and refined at a temperature of 700-730°C, that is, the nozzle of the blowing device is smelted The upper part of the furnace is inserted into the alloy liquid, and the N 2 The airborne impurity removal flux is injected for 10 minutes, the gas pressure is 0.25MPa, the flow rate is 50L / min, and the airborne flux flow rate is 200g / min. Close the flux valve to stop the flux supply, and then continue to separate N 2 The gas is injected for 10 minutes, then the gas supply valve is closed, and it is left to stand for 30 minutes, and then pouring is performed.

[0017] The obtained casting is tested by salt spray test, and the content of inclusions is reduced by two grades compared with the original conventional process, the tensile strength is increased by 20%, the corrosion resistance is impro...

Embodiment 2

[0019] For casting AM50 magnesium alloy, 50% of the raw materials are recycled production waste or castings after service, and the rest are pure magnesium ingots, pure aluminum, pure zinc and Mn-Al alloys, which are melted in a melting furnace, and the alloy melt is at a temperature of 700-730°C For refining, first SO 2 The airborne impurity removal flux was injected for 19 minutes, the gas pressure was 0.5MPa, the flow rate was 95L / min, and the airborne flux flow rate was 100g / min, the flux supply was stopped, and then the SO 2 Gas injection for 20 minutes, standing still for 40 minutes and pouring out of the furnace.

[0020] The obtained casting is inspected by the salt spray test, and the content of inclusions is reduced by one level compared with the original conventional process, the tensile strength is increased by 16%, the corrosion resistance is improved by one level, and the amount of slag produced during smelting is reduced by 10%.

Embodiment 3

[0022] For casting AZ91D magnesium alloy, 50% of the raw materials are recycled production waste or castings after service, and the rest are pure magnesium ingots, pure aluminum, pure zinc and Mn-Al alloys, which are melted in a melting furnace, and the alloy melt is at a temperature of 720-740°C For refining, Ar gas-carrying impurity removal flux is sprayed for 17 minutes first, the gas pressure is 0.35MPa, the flow rate is 60L / min, and the air-carried flux flow rate is 200g / min, the flux supply is stopped, and then Ar gas spraying alone is continued for 20 minutes, and it is left to stand After 30 minutes, it was poured out of the furnace.

[0023] The obtained castings are tested by salt spray test, and the content of inclusions is reduced compared with the original conventional process; two grades, the tensile strength is increased by 15%, the corrosion resistance is improved by two grades, and the amount of slag produced during smelting is reduced by 13%.

[0024] In the ...

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Abstract

The present invention relates to a method for cleaning impurity in the course of casting and smelting magnesium alloy and its air-blowing equipment. It is characterized by that the impurity-removing solvent using pressure inert gas as carrier is blown into the molten alloy, its gas pressure is 0.05MPa-0.5 MPa, flow rate is 5Lmin-100 L / min, and the flow rate of solvent carrier by gas is 100g / min-500g / min. Said invention also provides its cleaning operation steps, it not only raises alloy purity and property, but also raises its production efficiency.

Description

technical field [0001] The invention relates to a casting magnesium alloy smelting process, in particular to a method for purifying impurities in the smelting process. Background technique [0002] The raw materials used in casting magnesium alloys were mainly pure magnesium and alloying elements in the past, that is, adding alloying elements directly to pure magnesium and refining them. Recently, with more and more magnesium alloy products and parts, the parts after service and the runners and waste parts in production are used to re-produce magnesium alloys, but the surface of this part of the material is coated with a protective film or stained with oil, and In order to improve the performance of the alloy (such as creep resistance), easily oxidized calcium and rare earth elements are added, so that the production of the alloy needs to be refined, and the impurities removed increase. At present, the refining method used in the production of magnesium alloys is to directl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/05C22C1/06C22C23/00
Inventor 周宏侯骏李德彦刘勇兵孙广平佟国栋
Owner JILIN UNIV
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