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Recycling method of cadmium telluride waste

A recovery method, cadmium telluride technology, applied in the direction of cadmium sulfide, element selenium/tellurium, etc., can solve the problems of inability to directly recover cadmium sulfide compounds, etc., and achieve the effects of easy large-scale treatment, high economic benefits, and simple process flow

Pending Publication Date: 2022-03-04
中国东方电气集团有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, currently available information can only recycle tellurium and cadmium in cadmium telluride into tellurium oxide and cadmium oxide, and there is no cadmium sulfide compound that can be directly recycled into tellurium simple substance and has economic benefits.

Method used

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  • Recycling method of cadmium telluride waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A. After crushing and screening 1 kg of collected cadmium telluride waste, obtain a powder with a particle size of 0.15-0.3 mm, and set aside;

[0055] B. mix the cadmium telluride powder obtained in step A with 70g / L H 2 SO 4 , 30%H 2 o 2 Mix according to the mass ratio of 1:6:1.3, react at 65°C, stir during the reaction, and after the black powder is completely dissolved, a mixed solution containing tellurous acid and cadmium salt is obtained;

[0056] C, the solution that step B obtains is added sulfurous acid solution; The weight ratio of sulfurous acid solution and cadmium telluride waste material is 2:1, the concentration of sulfurous acid solution is 6%, and the reaction time is 2h;

[0057] D, after reduction finishes, filter, obtain filter residue and filtrate;

[0058] ① The filter residue was repeatedly washed to neutral and then dried. After testing, the weight of the filter residue was 0.49kg, and the main component was tellurium. The recovery rate of t...

Embodiment 2

[0062] 5kg of cadmium telluride waste was tested by the method described in Example 1, only step B in Example 1 was changed, and other processes were unchanged. Step B is revised as: the cadmium telluride powder obtained in step A is mixed with 80g / L H 2 SO 4 , 30%H 2 o 2 Mix according to the mass ratio of 1:6:1.3, react at 65°C, stir during the reaction, and after the black powder is completely dissolved, a mixed solution containing tellurous acid and cadmium salt is obtained.

[0063] test results:

[0064] The filter residue was repeatedly washed to neutral and then dried. After testing, the weight of the filter residue was 2.446kg, and the main component was tellurium; the recovery rate of tellurium was 92.15%;

[0065] Dry the filter residue and put it into a vacuum distillation system for distillation and purification. The vacuum distillation temperature is set at 550°C and the vacuum degree is set at 5×10 -3 Pa, vacuum preservation after distillation, after testing...

Embodiment 3

[0068] 10kg of cadmium telluride waste was tested according to the method of Example 1, only step B in Example 1 was changed, and other processes were unchanged. In step B: mix the cadmium telluride powder obtained in step A with 80g / L H 2 SO 4 , 30%H 2 o 2 Mix according to the mass ratio of 1:6:1.3, react at 80°C, stir during the reaction, and after the black powder is completely dissolved, a mixed solution containing tellurous acid and cadmium salt is obtained;

[0069] test results:

[0070] The filter residue was repeatedly washed to neutral and then dried. After testing, the weight of the filter residue was 4.89kg, and the main component was tellurium; the recovery rate of tellurium was 92.09%;

[0071] Dry the filter residue and put it into a vacuum distillation system for distillation and purification. The vacuum distillation temperature is set at 550°C and the vacuum degree is set at 5×10 -3 Pa, vacuum preservation after distillation, after testing, the product we...

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Abstract

The invention relates to a recovery method of cadmium telluride waste, and belongs to the technical field of cadmium telluride recovery. The recovery method of the cadmium telluride waste material comprises the following steps: a, crushing the cadmium telluride waste material, adding an acid and an oxidizing agent, and reacting at 45-85 DEG C to obtain a solution A after the reaction is completed; b, a sulfurous acid solution is added into the solution A for a reduction reaction, solid-liquid separation is performed after the reaction is completed, and filter residues and filtrate are obtained; c, treatment of filter residues: washing and drying the filter residues, and performing vacuum distillation purification at the vacuum distillation temperature of 520-570 DEG C and the vacuum degree of 3 * 10 <-3 >-6 * 10 <-3 > Pa to obtain elemental tellurium; and filtrate treatment: introducing H2S gas into the filtrate to obtain CdS. The method has the advantages of simple recovery process flow, easiness in operation and easiness in large-scale treatment.

Description

technical field [0001] The invention relates to a method for recovering cadmium telluride waste materials, and belongs to the technical field of cadmium telluride recovery. Background technique [0002] Cadmium telluride, as an important II-VI compound semiconductor, can be used in photovoltaic and electronic fields. Ultra-high-purity cadmium telluride can be used in spectral analysis, infrared electro-optic modulators, infrared detectors, infrared lenses and windows, phosphors, room temperature gamma-ray detectors, light-emitting devices close to the visible region, etc. in semiconductors. It is a very important infrared optoelectronic material and the main photosensitive material used in infrared detectors of military and aerospace systems. It has shown outstanding advantages in resource surveys, satellite aerial surveys, and laser guidance. At the same time, it is used in security systems, such as video alarm systems for military, armed police and public security systems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02C01G11/02
CPCC01B19/02C01G11/02C01P2006/80
Inventor 雷聪袁小武张程杨武勇雷云棣蒋杰昌
Owner 中国东方电气集团有限公司
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