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Recycling method of metal powder return scrap

A technology of metal powder and return material, applied in the field of recycling of metal powder return material, can solve the problems of increasing oxygen and nitrogen in molten steel, absorbing oxygen and nitrogen, large specific surface area of ​​return material, etc. The effect of content reduction and high recycling rate

Active Publication Date: 2022-05-13
中航迈特增材科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area of ​​the returned material, the absorption of oxygen and nitrogen is serious, so the increase of oxygen and nitrogen in molten steel is serious during the smelting process, especially in non-vacuum smelting powder making;
[0008] (3) There are great safety hazards in the smelting process of returning material with master alloy or bulk bulk material: in vacuum smelting, the melting speed of returning material is slow and easy to agglomerate and bridge, resulting in the overhead phenomenon of the material in the melting crucible, which makes the operator Misjudgment of the smelting temperature will bring safety hazards such as molten steel piercing through the furnace and explosion;

Method used

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  • Recycling method of metal powder return scrap
  • Recycling method of metal powder return scrap
  • Recycling method of metal powder return scrap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0032] The preparation embodiment of volatilizable macromolecular material wrapping:

[0033] Embodiments 1-8 prepare volatile polymer material wrappers according to the formula in Table 1 below:

[0034]

[0035] The specific preparation process of embodiment 1-8 volatile polymer material wrapping is:

[0036] According to the formula in Table 1, add each raw material into the high-speed mixer, raise the temperature to 75°C, and mix the materials for 12 minutes, and mix the materials uniformly; transfer the uniformly mixed materials in the high-speed mixer to the internal mixer for banburying , the temperature in the internal mixer is 140°C, and the banburying time is 25min; the material after banbury mixing is sent into the extruder for extrusion operation, and the temperature of the extruder is 160°C; The material is calendered, stretched, and cooled by a calender. The roller temperature of the calender is 170°C. During the calendering and stretching, the thickness of t...

Embodiment 9

[0040] Adopt the application technical scheme to carry out the recycling of GH3536 return material, concrete method is as follows:

[0041] (1) Put the 0-15 micron and 53-250 micron GH3536 return material into the mixer, mix the mixer at a speed of 8 rpm for 3 hours, and mix the material evenly into a coarse powder;

[0042](2) Using the volatilizable polymer material sheath of Example 1 (composition: polyethylene, polyvinyl chloride, zinc stearate, paraffin), coat the coarse powder to form a powder sheath, volatilize the polymer material The weight of the package is less than 0.1%;

[0043] (3) Put the powder sheath into a mold cavity with a diameter of φ50 and a height of 50 mm, and use a press with a pressure of 200 tons to mold the powder sheath at a rate of 2 times / min; press the returned material into a block cylinder;

[0044] (4) Directly smelting the returned bulk cylinder to obtain the finished product.

Embodiment 10

[0046] The same method as in Example 9 is used to recycle the GH3536 returned material, the difference is that the "volatizable polymer material wrapper of Example 1" is replaced with "the volatilizable polymer material wrapper of Example 2".

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Abstract

The invention relates to a recycling method of metal powder return scraps, which comprises the following steps: placing the return scraps in a mixer for mixing, and uniformly mixing the return scraps into coarse powder; wrapping the coarse powder by adopting a volatile high polymer material sheath to form a powder sheath; the powder sheath is placed in a die cavity, a press machine with the pressure of 200 tons is adopted, compression molding is conducted on the powder sheath, the pressing rate is 2 times / min, and the return material is pressed into blocks; and the blocky return scrap is directly smelted to obtain a finished product, no master alloy or blocky bulk material needs to be added, and 98% or above of cyclic utilization is achieved. According to the recycling method for the return scrap, efficient recycling of the return scrap can be achieved, smelting can be directly conducted without matching of mother alloy or blocky bulk materials, and the ultrahigh recycling rate is achieved.

Description

technical field [0001] The invention relates to a method for recycling metal powder return materials, and belongs to the technical field of metal powder preparation. Background technique [0002] Atomization powder making technology is the process of using high-energy atomization medium (water, gas) to break molten metal into fine droplets, and cooling and solidifying into solid powder. Atomized powder is widely used in traditional powder metallurgy, injection molding, laser cladding, additive manufacturing and other fields. The powder grades and particle size ranges applicable to different application fields are different. For example, in the field of traditional powder metallurgy, powders of 0-75 μm are generally used; in the field of injection molding, powders of 0-20 μm are generally used; laser cladding usually uses 53 - 150μm powder; additive manufacturing (i.e. 3D printing) typically uses 15-53μm powder. The macaroni powder obtained by atomization milling is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F9/08C08L27/06C08L23/06C08L91/06C08K5/098
CPCB22F3/02B22F9/082C08L27/06C08L23/06C08L91/06C08K5/098Y02P10/25
Inventor 郑吉祥高正江马腾张飞陈欣杨环殷雷王伟
Owner 中航迈特增材科技(北京)有限公司
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