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Method for extracting, separating and recycling nickel and cobalt in waste nickel-based high-temperature alloy by using melt

A nickel-based superalloy, separation and recovery technology, applied in the direction of reducing gas emissions, improving process efficiency, etc., can solve the problems of low product purity, uncompetitiveness, and low added value, and achieve short process flow, wide use, and equipment simple effect

Active Publication Date: 2020-10-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The current recycling method can only convert nickel in superalloy waste into nickel salt or nickel powder, and the product has low purity and low added value, so it is not competitive in the market
At present, there is no report on the direct conversion of nickel in the superalloy return material into high-purity nickel

Method used

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  • Method for extracting, separating and recycling nickel and cobalt in waste nickel-based high-temperature alloy by using melt

Examples

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Embodiment 1

[0046] The Ni-based superalloy waste to be recovered and separated in this embodiment includes Ni, Co, Fe, Mo, and Ta elements, wherein the mass percentage of Ni is 52.6%, and the mass percentage of Co is 9.5%.

[0047] combine figure 1 , The method for separating and recovering nickel and cobalt from nickel-based superalloy waste in this embodiment includes the following steps.

[0048] (1) Treat the surface of the nickel-based superalloy waste to remove the refractory material on the surface of the nickel-based superalloy waste, and then clean and dry the waste nickel-based superalloy to obtain clean raw materials.

[0049] (2) Take 1000g of clean nickel-based superalloy material, 5000.0g of Mg-Bi binary alloy as the extraction medium, and the molar percentages of Mg and Bi in the Mg-Bi binary alloy are 90% and 10% respectively. The clean nickel-based superalloy is placed in a porous and liftable titanium mesh, the extraction medium is placed in a graphite crucible, and the...

Embodiment 2

[0052] The Ni-based superalloy waste to be recovered and separated in this embodiment includes Ni, Co, Fe, Mo, and Ta elements, wherein the mass percentage of Ni is 54.6%, and the mass percentage of Co is 9.3%.

[0053] combine figure 1 , The method for separating and recovering nickel and cobalt from nickel-based superalloy waste in this embodiment includes the following steps.

[0054] (1) Treat the surface of the nickel-based superalloy waste to remove the refractory material on the surface of the nickel-based superalloy waste, and then clean and dry the waste nickel-based superalloy to obtain clean raw materials.

[0055] (2) Take 900g of clean nickel-based superalloy material, 7200.0g of Mg-Sn binary alloy as the extraction medium, and the molar percentages of Mg and Sn in the Mg-Sn binary alloy are 70% and 30% respectively. The clean nickel-based superalloy is placed in a porous and liftable titanium mesh, the extraction medium is placed in a graphite crucible, and then...

Embodiment 3

[0058] The Ni-based superalloy waste to be recovered and separated in this embodiment includes Ni, Co, Fe, Mo, and Ta elements, wherein the mass percentage of Ni is 58.7%, and the mass percentage of Co is 10.4%.

[0059] combine figure 1 , The method for separating and recovering nickel and cobalt from nickel-based superalloy waste in this embodiment includes the following steps.

[0060] (1) Treat the surface of the nickel-based superalloy waste to remove the refractory material on the surface of the nickel-based superalloy waste, and then clean and dry the waste nickel-based superalloy to obtain clean raw materials.

[0061] (2) Take 800g of clean nickel-based superalloy material, 2400.0g of Mg-Pb binary alloy as the extraction medium, and the molar percentages of Mg and Pb in the Mg-Pb binary alloy are 80% and 20% respectively. Put the clean nickel-based superalloy in a porous and liftable titanium mesh, place the extraction medium in a magnesia crucible, then put the magn...

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Abstract

The invention discloses a method for extracting, separating and recycling nickel and cobalt in waste nickel-based high-temperature alloy by using a melt. The method comprises the following steps thatS1, molten Mg-M alloy is taken as an extraction medium and the waste nickel-based high-temperature alloy is taken as a to-be-extracted substance, extraction treatment is carried out, and eutectic meltand alloy residues are obtained, wherein Mg is used as a main metal in the Mg-M alloy, and M metal is one or more of Pb, Bi and Sn; and S2, the eutectic obtained in the step 1 is subjected to vacuumdistillation to obtain metal nickel-cobalt powder and the condensed extraction medium. The invention provides a clean and efficient method for separating and recycling the metal nickel and cobalt in the waste nickel-based high-temperature alloy. The method is short in technological process, simple in equipment, high in nickel-cobalt recycling rate and low in cost, the extraction medium can be recycled, and the process is clean and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of recycling waste superalloys, in particular to a method for recycling metal nickel and cobalt in waste nickel-based superalloys. Background technique [0002] Nickel-based superalloy refers to a superalloy with nickel as the matrix, which has strong strength, good oxidation resistance and gas corrosion resistance in the temperature range of 650 ° C to 1000 ° C. In addition to the main metals such as nickel, cobalt, and chromium in the nickel-based superalloy, it also contains a large amount of precious rare metals, such as rhenium, tungsten, tantalum, niobium, and hafnium. Nearly 300,000 tons of superalloy materials are consumed in the international market every year. Therefore, the recycling of superalloys has a good prospect. Superalloys that have reached their service life and waste generated during the production process are important sources of superalloy recycling. [0003] There are many ways to re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C22B7/00
CPCC22B23/02C22B7/004Y02P10/20Y02P10/146
Inventor 田庆华甘向栋郭学益崔富晖于大伟张纯熹
Owner CENT SOUTH UNIV
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