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Method for recycling tellurium from tellurium zinc cadmium waste materials

A technology for cadmium telluride and waste, which is applied in the field of recovering tellurium from cadmium tellurium waste, can solve the problems of complicated process, difficult industrialization, consumption of large auxiliary materials, etc., and achieves the effects of simple process, easy industrial production and reduction of recovery cost.

Active Publication Date: 2017-12-01
昆明先导新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this recycling method is that: the hydrothermal oxidation in the recycling process requires high-temperature oxidation at 180°C, and the use of 8mol / L sulfuric acid requires a large amount of auxiliary materials. The process is complicated, the cost is high, and it is difficult to industrialize.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Get 100g broken ball mill and sieve through 100 purpose cadmium zinc telluride waste (Cd 0.5 Zn 0.5 Te), the tellurium content is 59%, add 400g of water, stir and mix evenly to form the first mixed solution, add 15g of sodium chlorate to the first mixed solution, stir to dissolve, heat up to 60°C, and then slowly add dropwise the mass concentration of 30 % industrial concentrated hydrochloric acid 120g, after adding hydrochloric acid, stir and react at 80~85°C for 2 hours, and filter to obtain leaching residue.

[0040] The chemical reactions involved are:

[0041] 3Cd X Zn (1-X) Te+6HCl+NaClO 3 =NaCl+3XCdCl 2 +3(1-X)ZnCl 2 +3H 2 O+3Te; where 0

[0042] Add 400g of 5% dilute hydrochloric acid to the leaching residue, wash at 60°C for 4 hours, and filter to obtain 58.0g of crude tellurium, with a recovery rate of 98.3%. The tellurium content in the crude tellurium is >99%, and the impurity content is less than 1%.

Embodiment 2

[0044] Get 100g broken ball mill and sieve through 100 purpose cadmium zinc telluride waste (Cd 0.5 Zn 0.5 Te), the tellurium content is 59%, add 600g of water, stir and mix evenly to form the first mixed solution, add 18g of sodium chlorate to the first mixed solution, stir to dissolve, raise the temperature to 65°C, and then slowly add dropwise the mass concentration of 32 % industrial concentrated hydrochloric acid 120g, after adding hydrochloric acid, stir and react at 80~85°C for 2 hours, and filter to obtain leaching residue.

[0045] The chemical reactions involved are:

[0046] 3Cd X Zn (1-X) Te+6HCl+NaClO 3 =NaCl+3XCdCl 2 +3(1-X)ZnCl 2 +3H 2 O+3Te; where 0

[0047] Add 400g of 2% dilute hydrochloric acid to the leaching residue, wash at 70°C for 3 hours, and filter to obtain 56.0g of crude tellurium, with a recovery rate of 94.9%. The tellurium content in the crude tellurium is >99.5%, and the impurity content is less than 0.5%. ...

Embodiment 3

[0049] Get 100g broken ball mill and sieve through 100 purpose cadmium zinc telluride waste (Cd 0.5 Zn 0.5 Te), the tellurium content is 59%, add 800g of water, stir and mix evenly to form the first mixed solution, add 20g of sodium chlorate to the first mixed solution, stir and dissolve, then raise the temperature to 70°C, then slowly add dropwise the mass concentration of 33 % industrial concentrated hydrochloric acid 130g, after adding hydrochloric acid, stir and react at 80~85°C for 2 hours, and filter to obtain leaching residue.

[0050] The chemical reactions involved are:

[0051] 3Cd X Zn (1-X) Te+6HCl+NaClO 3 =NaCl+3XCdCl 2 +3(1-X)ZnCl 2 +3H 2 O+3Te; where 0

[0052] Add 500g of 2% dilute hydrochloric acid to the leaching residue, wash at 80°C for 2 hours, and filter to obtain 55.0g of crude tellurium with a recovery rate of 93.2%. The tellurium content in the crude tellurium is more than 99.8%, and the impurity content is less th...

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PUM

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Abstract

The invention relates to a method for recycling tellurium from tellurium zinc cadmium waste materials. The method includes the steps: S1 crushing, ball-milling and sieving the tellurium zinc cadmium waste materials and uniformly mixing the tellurium zinc cadmium waste materials with water to form first mixed liquor; S2 adding an appropriate quantity of oxidizing agents into the first mixed liquor, heating the first mixed liquor to reach the temperature of 60-80 DEG C, and then slowly dropwise adding first acid agents to form second mixed liquor; S3 filtering the second mixed liquor to obtain first solution and leaching residues; S4 adding second acid agents into the leaching residues, and washing and filtering the leaching residues to obtain 2-3N of tellurium products. Compared with the prior art, the method for recycling tellurium from the tellurium zinc cadmium waste materials has the advantages that high-temperature oxidation reaching up to 180 DEG C is omitted, tellurium does not enter the solution, the process of restoring tellurium from the solution again is omitted, needed auxiliary materials are common reagents, recycling cost can be reduced, technology is simple, and industrial production is easily realized.

Description

technical field [0001] The invention relates to the field of resource recovery, in particular to a method for recovering tellurium from cadmium zinc telluride waste materials. Background technique [0002] Cadmium zinc telluride, English name cadmium zinc telluride (CdZnTe, abbreviated as CZT). CZT crystal is a wide bandgap II-VI compound semiconductor, which can be regarded as a solid solution of CdTe and ZnTe. The melting point varies from 1092°C to 1295°C with the addition of Zn. [0003] CZT crystals are widely used as epitaxial substrates for infrared detectors HgCdTe and room temperature nuclear radiation detectors. The many advantages of CdZnTe detectors make it more and more widely used in nuclear safety, environmental monitoring, astrophysics and other fields. In terms of scientific research, CdZnTe detectors have great application prospects in high-energy physics, for example, it can be used in the acceleration system of high-energy particles. In addition, CdZn...

Claims

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Application Information

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IPC IPC(8): C01B19/02
CPCC01B19/02
Inventor 殷亮熊平朱刘
Owner 昆明先导新材料科技有限责任公司