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Method of recovering tellurium from cadmium telluride waste materials

A technology for cadmium telluride and waste, which is applied in chemical instruments and methods, cadmium sulfide, selenium/tellurium compounds, etc., to achieve the effects of simple process, safe operation and high recovery rate

Active Publication Date: 2017-09-05
广东先导稀贵金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is no published literature report of a method for recovering tellurium from cadmium telluride waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 50g of cadmium telluride waste crushed through a 100-mesh sieve, add 350ml of deionized water and stir evenly to form the first mixed solution, add 30g of 98% concentrated sulfuric acid, stir and react at 60~70°C for 1 hour, then slowly Add 50g 50% H dropwise 2 o 2 The solution forms the second mixed solution. During the process, the potentiometer is used to measure the potential of the first mixed solution in real time, and the potential is maintained between 300mv and 560mv. The reference electrode of the potentiometer is a silver / silver chloride electrode, and the measuring electrode is a platinum electrode. , after adding H 2 o 2 After solution, keep warm at 80°C for 2 hours, filter to obtain the first solution and tellurium dioxide precipitate, in which a small amount of Te enters the liquid, and the tellurium dioxide precipitate is washed and dried to obtain TeO with a purity of 99.38%. 2 , TeO 2 The direct recovery rate is 96.69%, and the Cd leaching rat...

Embodiment 2

[0044] Take 600g of cadmium telluride waste crushed through a 100-mesh sieve, add 1800ml of deionized water and stir evenly to form the first mixed solution, add 600g of 98% concentrated sulfuric acid, and stir for 2 hours at a temperature of 60~70°C, then slowly Add 360g 50%H dropwise 2 o 2 solution to form a second mixture, adding H 2 o 2 During the solution process, use a potentiometer to measure the potential of the first mixed solution in real time, and maintain the potential between 300mv and 560mv. The reference electrode of the potentiometer is a silver / silver chloride electrode, and the measuring electrode is a platinum electrode. After adding H 2 o 2 After solution, heat preservation reaction at 80°C for 2 hours, filter to obtain the first solution and tellurium dioxide precipitate, in which a small amount of Te enters the liquid, and the tellurium dioxide precipitate is washed and dried to obtain TeO with a purity of 99.68%. 2 , TeO 2 The direct recovery rate i...

Embodiment 3

[0047] Take 600g of cadmium telluride waste crushed through a 100-mesh sieve, add 3000ml of deionized water and stir evenly to form the first mixed solution, add 600g of 98% concentrated sulfuric acid, stir and react at 60~70℃ for 6h, then slowly Add 360g 50%H dropwise 2 o 2 solution to form a second mixture, adding H 2 o 2 During the solution process, use a potentiometer to measure the potential of the first mixed solution in real time, and maintain the potential between 300mv and 560mv. The reference electrode of the potentiometer is a silver / silver chloride electrode, and the measuring electrode is a platinum electrode. After adding H 2 o 2 After solution, heat preservation reaction at 80°C for 1 h, filter to obtain the first solution and tellurium dioxide precipitate, in which a small amount of Te enters the liquid, and the tellurium dioxide precipitate is washed and dried to obtain TeO with a purity of 99.982%. 2 , TeO 2 The direct recovery rate is 97.24%, and the Cd...

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Abstract

The invention relates to a method of recovering tellurium from cadmium telluride waste materials. The method comprises the following steps: step one, grinding and sieving cadmium telluride waste materials, and evenly mixing processed cadmium telluride waste materials with water to form a first mixed solution; step two, adding an acid into the first mixed solution, carrying out reactions for a while, and then adding an oxidant to form a second mixed solution; and step three, filtering the second mixed solution to obtain a first solution and tellurium dioxide precipitates. By controlling the oxidation potential during the leaching process of cadmium telluride waste materials, tellurium and cadmium are separated and recovered, the purities of obtained tellurium dioxide and cadmium sulfide can both reach 2N-3N, the technology is simple, the operation is safe, the cost is low, and the recovery rate is high.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for recovering tellurium from cadmium telluride. Background technique [0002] Cadmium telluride is widely used in infrared detectors, solar cells, photovoltaic materials and X8-ray detectors. At present, the cadmium telluride thin-film solar industry is developing rapidly and is considered one of the most promising solar technologies. It is expected that with the development of the cadmium telluride thin-film solar industry, the demand for cadmium telluride will continue to grow rapidly. [0003] At present, the production methods of cadmium telluride mainly focus on liquid phase synthesis and gas phase synthesis. Cadmium telluride waste is produced in the process. Chinese patent application CN200710049888.8 discloses a cadmium telluride recovery device and its recovery method, using pyrometallurgy to directly recover cadmium telluride products. In addition, there is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C01B19/02C01G11/02
CPCC01B19/004C01B19/02C01B19/04C01G11/02C01P2006/80
Inventor 殷亮朱刘
Owner 广东先导稀贵金属材料有限公司
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