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Method for separating and recovering nickel and cobalt in waste nickel-based superalloy by melt extraction

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 added value, no competitiveness, low product purity, etc., to achieve simple equipment, wide use, nickel-cobalt The effect of high recovery rate

Active Publication Date: 2022-07-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 separating and recovering nickel and cobalt in waste nickel-based superalloy by melt extraction

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The nickel-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 In this embodiment, the method for separating and recovering nickel and cobalt from nickel-based superalloy waste materials includes the following steps.

[0048] (1) The surface of the nickel-based superalloy waste is treated to remove the refractory material on the surface of the nickel-based superalloy waste, and then the waste nickel-based superalloy is cleaned and dried to obtain clean raw materials.

[0049] (2) Take 1000g of clean nickel-based superalloy material, extract 5000.0g of Mg-Bi binary alloy, and the mole 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 hoistable titanium mesh, the extraction medium is placed in a graphite crucible,...

Embodiment 2

[0052] The nickel-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 In this embodiment, the method for separating and recovering nickel and cobalt from nickel-based superalloy waste materials includes the following steps.

[0054] (1) The surface of the nickel-based superalloy waste is treated to remove the refractory material on the surface of the nickel-based superalloy waste, and then the waste nickel-based superalloy is cleaned and dried to obtain clean raw materials.

[0055] (2) Take 900 g of clean nickel-based superalloy material, 7200.0 g of Mg-Sn binary alloy as the extraction medium, and the mole 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 hoistable titanium mesh, the extraction medium is placed in a...

Embodiment 3

[0058] The nickel-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 In this embodiment, the method for separating and recovering nickel and cobalt from nickel-based superalloy waste materials includes the following steps.

[0060] (1) The surface of the nickel-based superalloy waste is treated to remove the refractory material on the surface of the nickel-based superalloy waste, and then the waste nickel-based superalloy is cleaned and dried to obtain clean raw materials.

[0061] (2) Take 800 g of clean nickel-based superalloy material, 2400.0 g of Mg-Pb binary alloy as the extraction medium, and the mole percentages of Mg and Pb in the Mg-Pb binary alloy are 80% and 20%, respectively. The clean nickel-based superalloy is placed in a porous and liftable titanium mesh, the extraction medium is placed in a...

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Abstract

The invention discloses a method for separating and recovering nickel and cobalt in waste nickel-based superalloy by melt extraction, comprising the following steps: S1. Using molten Mg-M alloy as an extraction medium, and using waste and old nickel-based superalloy as a to-be-extracted substance , carry out extraction treatment, obtain eutectic and alloy residue, in described Mg-M alloy, Mg is main metal, and M metal is one or more in Pb, Bi, Sn; S2. the eutectic obtained by S1 The body is subjected to vacuum distillation to obtain metallic nickel-cobalt powder and a condensed extraction medium. The invention provides a clean and efficient method for separating and recovering metal nickel and cobalt in waste nickel-based superalloy. The method has the advantages of short technological process, simple equipment, high nickel-cobalt recovery rate, low cost, recyclable extraction medium, and clean and environment-friendly process.

Description

technical field [0001] The invention relates to the technical field of recycling of 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 high-temperature alloy with nickel as the matrix, which has strong strength and good resistance to oxidation and gas corrosion in the temperature range of 650 ° C to 1000 ° C. In addition to the main metals such as nickel, cobalt, and chromium, nickel-based superalloys also contain a large number of precious rare metals, such as rhenium, tungsten, tantalum, niobium and hafnium. The annual consumption of superalloy materials in the international market is nearly 300,000 tons, so the recycling of superalloys has a good prospect. [0003] There are various methods for recovering valuable metal elements from superalloy scrap, such as pyrolysis, hydrometallurgy and electrochemical methods. The methods for recoverin...

Claims

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Application Information

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Patent Type & Authority Patents(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