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A method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste slag

A technology of sodium arsenate and gallium arsenide, which is applied in the field of recovery and preparation of sodium arsenate and metal gallium, to achieve the effect of solving environmental pollution, waste of resources and high utilization value

Active Publication Date: 2021-06-29
YANGZHOU NINGDA NOBLE METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of recycling and harmless treatment of gallium arsenide-containing waste residue, a method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste residue is provided

Method used

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  • A method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste slag
  • A method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste slag
  • A method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste slag

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Embodiment 1

[0032] A method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste slag, comprising the steps of:

[0033] (1) Using gallium arsenide waste slag as raw material, the gallium arsenide waste slag is a slimy gray-black massive solid, after drying at 105°C, crush it through a 100-mesh sieve, divide the waste slag into 100g / parts, and set aside ;

[0034] (2) Put the first part of waste residue in a 1L beaker, add 500mL of distilled water, add 40g of NaOH according to the NaOH concentration of 80g / L, heat and stir, control the stirring speed at 600rpm, control the temperature at 70°C, and follow the 80mL / L H 2 o 2 Add 40mL of hydrogen peroxide at a concentration of 10mL each time, and add in four times to form an alkaline-oxidizing solution system, so that the arsenic and gallium in the waste residue are simultaneously and rapidly dissolved in the alkaline-oxidizing solution system to form a leachate, realizing the same For the effective se...

Embodiment 2

[0041] A method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste slag, comprising the steps of:

[0042] (1) Using gallium arsenide waste slag as raw material, the gallium arsenide waste slag is a slimy gray-black massive solid, after drying at 105°C, crush it through a 100-mesh sieve, divide the waste slag into 100g / parts, and set aside ;

[0043] (2) Put 1 part of waste residue in a 1L beaker, add 500mL of distilled water, add 50g of NaOH according to the NaOH concentration of 100g / L, heat and stir, control the stirring speed at 800rpm, and control the temperature at 70°C, according to 80mL / L of H 2 o 2 Add 40mL of hydrogen peroxide at a concentration of 10mL each time, and add in four times to form an alkaline-oxidizing solution system, so that the arsenic and gallium in the waste residue are simultaneously and rapidly dissolved in the alkaline-oxidizing solution system to form a leachate, realizing the same For the effective sepa...

Embodiment 3

[0048] A method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste slag, comprising the steps of:

[0049] (1) Using gallium arsenide waste slag as raw material, the gallium arsenide waste slag is a slimy gray-black massive solid, after drying at 105°C, crush it through a 100-mesh sieve, divide the waste slag into 100g / parts, and set aside ;

[0050] (2) Put 1 part of waste residue in a 1L beaker, add 500mL of distilled water, add 50g of NaOH according to the NaOH concentration of 100g / L, heat and stir, control the stirring speed at 600rpm, and control the temperature at 70°C, according to the concentration of 100mL / L of H 2 o 2 Add 50mL of hydrogen peroxide at a concentration of 10mL each time, and add in five times to form an alkaline-oxidizing solution system, so that the arsenic and gallium in the waste residue are simultaneously and rapidly dissolved in the alkaline-oxidizing solution system to form a leachate, achieving the same ...

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Abstract

The invention relates to a method for recovering and preparing sodium arsenate and metal gallium from gallium arsenide waste slag. The gallium arsenide waste slag is dried, crushed and sieved and then leached in an alkaline-oxidizing solution system to control the leaching time. NaOH concentration, oxidant concentration, time, temperature and other conditions, so that arsenic and gallium are rapidly dissolved in the leachate to the greatest extent at the same time, and then through evaporation and crystallization, sodium arsenate is preferentially crystallized to achieve rapid and effective separation of arsenic and gallium; Crystallization improves the purity of sodium arsenate; high-purity metal gallium is obtained by swirl electrowinning. The gallium arsenide waste slag, the raw material of the present invention, comes from solid waste landfills, and there is no cost for sampling. The method of the present invention recovers and prepares sodium arsenate and metal gallium from the waste slag. The purity of the prepared sodium arsenate is at least 95%, and the obtained The gallium metal has a purity of at least 3N and has high utilization value, and the recovered and purified sodium arsenate can be used as a chemical raw material; the method of the invention effectively solves the problems of environmental pollution and waste of resources, and meets the requirements of a sustainable development society.

Description

technical field [0001] The invention relates to the technical field of recycling waste materials, in particular to a method for preparing sodium arsenate and metal gallium from gallium arsenide waste residue. Background technique [0002] Gallium arsenide is one of the most mature compound semiconductor materials at present. Compared with silicon, it has the characteristics of wide band gap, high electron mobility, high electron saturation drift speed, and direct bandgap energy band structure. These characteristics determine its main position in the development of microelectronic devices such as high frequency, high speed, high temperature and radiation resistance. Gallium arsenide's direct bandgap characteristics determine that it can also be used to make optoelectronic devices and solar cells. Gallium arsenide materials are mainly divided into two categories: semi-insulating gallium arsenide materials and semiconductor gallium arsenide materials. Semi-insulating gallium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B58/00C25C1/22C01G28/02
CPCC01G28/023C01P2006/80C22B7/008C22B58/00C25C1/22Y02P10/20
Inventor 朱炳龙吴彤种柯李尧岳喜龙童霏樊红杰秦恒飞吴娟李静周全法
Owner YANGZHOU NINGDA NOBLE METAL CO LTD
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