Method for recovering tellurium and cadmium from cadmium telluride wastes

A cadmium telluride and waste technology is applied in the directions of cadmium sulfide, binary selenium/tellurium compounds, selenium/tellurium oxides/hydroxides, etc., to achieve the effects of low cost, safe operation and high recovery rate

Inactive Publication Date: 2017-01-04
FIRST RARE MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, there is no published literature report on a method fo

Method used

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Effect test

Embodiment 1

[0043] 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

[0045] 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 2The direct recovery rate is 97.24%, and the Cd ...

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Abstract

The invention relates to a method for recovering tellurium and cadmium from cadmium telluride wastes. The method comprises the following steps: S1: breaking the cadmium telluride wastes, sieving the broken cadmium telluride wastes and then mixing the powder with water uniformly, thus forming first mixed liquor; S2: adding acid to the first mixed liquor to react for a period of time and then adding an oxidant to form second mixed liquor; S3: filtering the second mixed liquor, thus obtaining a first solution and a tellurium dioxide precipitate; S4: adding Cl<-> to the first solution, then adding sodium sulfite for reduction purification and carrying out filtration, thus obtaining a crude tellurium precipitate and a second solution; S5: then adding sulfides to the second solution and carrying out filtration, thus obtaining a cadmium sulfide precipitate. The method has the beneficial effects that separation and recovery of tellurium and cadmium are achieved by controlling the oxidation potential in the cadmium telluride waste leaching process; the purity of finally obtained tellurium dioxide and cadmium sulfide can reach 2-3N; the method is simple in process, is safe to operate and is low in cost and high in recovery rate.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for recovering tellurium and cadmium 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...

Claims

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Application Information

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IPC IPC(8): C01G11/02C01B19/04C01B19/02
CPCC01B19/004C01B19/02C01B19/04C01G11/02C01P2006/80
Inventor 殷亮李琴香朱刘邹林平
Owner FIRST RARE MATERIALS CO LTD
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