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Method for recovering scattered metal gallium in gallium nitride waste by pyrogenic process

A technology of scattered metal and gallium nitride, which is applied in the field of scattered metal gallium in gallium nitride waste recycling by fire method, can solve the problems of long process flow, high energy consumption, high recycling cost, etc., and achieve process parameter optimization, high recovery efficiency, low cost effect

Active Publication Date: 2021-11-16
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of long process flow, high energy consumption and high recycling cost existing in the existing process of processing gallium nitride waste, and to provide a method for recovering scattered metal gallium in gallium nitride waste by fire method

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this embodiment, a method for recovering scattered metal gallium in gallium nitride waste by fire method in this embodiment, specifically includes the following steps:

[0041] (1) The gallium nitride waste was ball milled to a thickness below 300 μm, and further dried at 110° C. for 96 h.

[0042] (2) Put the fully dried and ground gallium nitride waste powder in step (1) into a high-temperature resistant crucible made of corundum, and further place the crucible containing the gallium nitride waste into a closed tube furnace.

[0043] (3) Raise the temperature of the closed tube furnace in step (2) to 200°C to preheat the raw materials, and repeat the operation of vacuuming-filling inert argon twice, the vacuuming pressure is 1Pa, and the residual air and moisture in the furnace are removed .

[0044] (4) Further heat up the closed tube furnace in step (3) to 700°C at a speed of 5°C / min to thermally decompose the gallium nitride waste, and the reaction time is 8h; ...

Embodiment 2

[0048] A method for recovering scattered metal gallium in gallium nitride waste by fire method in this embodiment specifically includes the following steps:

[0049] (1) The gallium nitride waste was ball-milled to be below 300 μm, and further dried at 160° C. for 24 h.

[0050] (2) Put the fully dried and ground gallium nitride waste powder in step (1) into a high-temperature-resistant crucible made of magnesium oxide, and further place the crucible containing the gallium nitride waste into a closed tube furnace.

[0051] (3) Raise the temperature of the closed tube furnace in step (2) to 500°C to preheat the raw materials, and repeat the vacuum-filling operation with inert helium for 6 times, the vacuum pressure is 10Pa, and the residual air and moisture in the furnace are removed .

[0052] (4) Further heat up the closed tube furnace in step (3) to 1000°C at a speed of 20°C / min to thermally decompose the gallium nitride waste, and the reaction time is 2h; The protective g...

Embodiment 3

[0056] A method for recovering scattered metal gallium in gallium nitride waste by fire method in this embodiment specifically includes the following steps:

[0057] (1) The gallium nitride waste was ball milled to a size below 300 μm, and further dried at 120° C. for 96 h.

[0058] (2) Put the fully dried and ground gallium nitride waste powder in step (1) into a high-temperature-resistant crucible made of zirconia, and further place the crucible containing the gallium nitride waste into a closed tube furnace.

[0059] (3) Raise the temperature of the closed tube furnace in step (2) to 300° C. to preheat the raw materials, and repeat the vacuum-filling operation with inert nitrogen for 3 times. The vacuum pressure is 3 Pa, and the residual air and moisture in the furnace are removed.

[0060] (4) Further heat up the closed tube furnace in step (3) to 800°C at a speed of 10°C / min to thermally decompose the gallium nitride waste, and the reaction time is 3h; The protective gas...

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Abstract

The invention discloses a method for recovering scattered metal gallium in gallium nitride waste through a pyrogenic process, and belongs to the technical field of non-ferrous metallurgy. The method comprises the following steps: carrying out high-temperature calcination on the gallium nitride waste under a normal-pressure inert atmosphere protection condition, carrying out thermal decomposition on the gallium nitride waste to directly obtain a metal gallium product, converting nitrogen into N2, introducing the N2 into a protective gas for recycling, carrying out quenching cooling on the reaction product after the reaction, and recovering the metal gallium. By the adoption of the technical scheme, the metal gallium product can be obtained in one step, waste water, waste gas and waste residues are not generated in the whole process, the gallium recovery rate is high, the process is simple, cost is low, and environment friendliness is achieved; and meanwhile, efficient recovery of scattered metal gallium in the gallium nitride waste and cyclic utilization of nitrogen can be effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal metallurgy, and more specifically relates to a method for recovering scattered metal gallium in gallium nitride waste by fire method. Background technique [0002] Gallium nitride (GaN) is widely used in solid-state light sources, electronic power and microwave radio frequency devices due to its superior properties such as large band gap, high breakdown electric field, high thermal conductivity, high electron saturation drift rate and strong radiation resistance. Wide range of applications, its products cover semiconductor lighting, mobile communications, energy Internet, high-speed rail transit, new energy vehicles and consumer electronics and other fields. With the upgrading of products, the amount of waste slag containing gallium nitride in my country is also increasing rapidly year by year. Since gallium is a scattered metal, the annual output is limited. Products containing gallium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B58/00C22B7/00
CPCC22B58/00C22B7/001
Inventor 徐亮赵卓姚东田勇攀张福元张楷张晓峰吴俊
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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