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A method for recovering metal gallium from gallium nitride waste under normal pressure

A gallium nitride and metal gallium technology, applied in the field of metal gallium recovery, can solve the problems of low gallium recovery rate, large consumption of reagents, long process flow, etc. Effect

Active Publication Date: 2022-06-28
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of long process flow, large consumption of reagents, and low recovery rate of gallium in the recovery of gallium metal in gallium nitride waste by using the existing technology, and provides a method for recovering gallium from gallium nitride waste under normal pressure. Method for recovering metal gallium in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for recovering metal gallium from gallium nitride waste under normal pressure in this embodiment includes the following steps:

[0041] (1) Accurately weigh 80 g of NaOH solid and add it into water to prepare 1 L of alkaline solution with a concentration of 2 mol / L.

[0042] (2) The gallium nitride scrap powder was ball-milled to a thickness of 300 μm or less in advance, and dried at 110° C. for 96 hours. The fully dried and ground gallium nitride waste powder is added to the alkaline solution prepared in step (1), and the mixture is continuously stirred for 3 hours at room temperature for pre-impregnation, and the stirring speed is 200 rpm to obtain a mixed slurry.

[0043] (3) Under the condition of mechanical stirring, slowly add 500 mL of H with a concentration of 30% to the mixed slurry in step (2). 2 O 2 The mixed solution prepared with 25g NaClO was controlled at a drop rate of 50ml / min. After the dropwise addition was completed, the reaction was conti...

Embodiment 2

[0048] A method for recovering metal gallium from gallium nitride waste under normal pressure in this embodiment includes the following steps:

[0049] (1) Accurately weigh 240 g of NaOH solid and add it to water to prepare 1 L of alkaline solution with a concentration of 6 mol / L.

[0050] (2) The gallium nitride scrap powder was ball-milled to less than 300 μm in advance, and dried at 170° C. for 24 hours. The fully dried and ground gallium nitride waste powder is added to the alkaline solution prepared in step (1), and the mixture is continuously stirred for 1 hour at room temperature for pre-dipping, and the stirring speed is 500 rpm to obtain a mixed slurry.

[0051] (3) Under the condition of mechanical stirring, slowly add 500 mL of H with a concentration of 30% to the mixed slurry in step (2). 2 O 2 For the mixed solution prepared with 35g NaClO, the drop rate was controlled to be 100ml / min; after the dropwise addition was completed, the reaction was continuously stir...

Embodiment 3

[0056] A method for recovering metal gallium from gallium nitride waste under normal pressure in this embodiment includes the following steps:

[0057] (1) Accurately weigh 160 g of NaOH solid and add it into water to prepare 1 L of alkaline solution with a concentration of 4 mol / L.

[0058] (2) The gallium nitride scrap powder is pre-ball-milled to less than 300 μm, and dried at 120° C. for 96 hours. The fully dried and ground gallium nitride waste powder is added to the alkaline solution prepared in step (1), and the mixture is continuously stirred for 2 hours at room temperature for pre-impregnation, and the stirring speed is 300 rpm to obtain a mixed slurry.

[0059] (3) Under the condition of mechanical stirring, slowly add 500 mL of H with a concentration of 30% to the mixed slurry in step (2). 2 O 2 with 30g NaClO 3 The prepared mixed solution was controlled at a drop rate of 60ml / min; after the dropwise addition was completed, the reaction was continuously stirred f...

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Abstract

The invention discloses a method for recovering metal gallium from gallium nitride waste under normal pressure, belonging to the technical field of nonferrous metal metallurgy. The method of the present invention is to oxidize and leach gallium nitride waste by adding an oxidant to an alkaline system under normal pressure, so that gallium is dissolved and enters the leaching solution, while nitrogen is oxidized to environmentally friendly N 2 Enter the gas phase to realize the effective separation of gallium and nitrogen; then directly electrolyze the gallium-containing leaching solution, and accurately control the electrochemical conditions to reduce and precipitate gallium at the cathode while avoiding the precipitation of impurity ions to obtain metal gallium products. Adopting the technical solution of the present invention to recover scattered gallium metal from gallium nitride waste has the characteristics of high gallium recovery rate, simple process, low cost, and environmental friendliness, and effectively realizes short-process, high-efficiency and comprehensive recovery of gallium nitride waste.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal metallurgy, and more particularly relates to a method for recovering metal gallium from gallium nitride waste under normal pressure. Background technique [0002] Gallium is a rare metal, and there are basically no independent deposits in nature, and the average content in the crust is only about 17ppm. Gallium is often associated with bauxite and lead-zinc ores in the form of isomorphism because of its similar properties to metals such as aluminum and zinc, and is recovered as a by-product of aluminum and zinc smelting. The compounds formed by gallium and non-metallic elements such as nitrogen, arsenic, sulfur, and phosphorus have excellent semiconductor properties and are widely used in mobile communications, LED lighting, semiconductor materials, alloys, and medical devices. With the rapid development of my country's high-tech industry in recent years, the consumption of metal galliu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B58/00C22B7/00C25C1/22
CPCC22B58/00C22B7/008C25C1/22Y02P10/20
Inventor 赵卓徐亮周晓伟田勇攀张福元张楷熊延杭徐梦婷
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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