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Method for recovering tellurium from bismuth telluride-based thermoelectric cooler wastes

A bismuth telluride-based and semiconductor technology is applied in the field of recycling tellurium, which can solve the problems of high energy consumption and large environmental impact, and achieve the effects of reducing energy consumption, strong applicability, and improved recycling effect.

Active Publication Date: 2019-08-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for recovering tellurium from the waste materials of bismuth telluride-based semiconductor refrigeration chips, so as to solve the problems of high energy consumption and great environmental impact of the existing tellurium recovery technology, and to improve the recovery rate of metal tellurium

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  • Method for recovering tellurium from bismuth telluride-based thermoelectric cooler wastes

Examples

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Effect test

Embodiment 1

[0029] (1) Add 130g of bismuth telluride-based semiconductor refrigeration sheet waste into 5wt% sodium hydroxide solution and soak for 8h at 50°C, stirring continuously in the middle, cleaning to remove organic impurities such as oil, filtering, crushing and grinding, to obtain a particle size of 0.1 mm tellurium-containing material powder.

[0030] (2) Prepare a hydrochloric acid solution with a concentration of 4mol / L, measure 520mL of the hydrochloric acid solution according to the solid-liquid mass volume ratio of 1:4, and add the tellurium-containing material powder and the hydrochloric acid solution into the reaction vessel.

[0031] (3) Raise the reaction temperature in step 2 to 80° C., slowly add sodium hypochlorite whose mass is twice the mass of tellurium metal, keep the reaction for 2 hours, filter, and collect the filtrate A.

[0032] (4) Raise the reaction temperature to 85° C., add sodium sulfite whose mass is 8 times the mass of selenium metal to the filtrate ...

Embodiment 2

[0036](1) Add 100g of bismuth telluride-based semiconductor refrigeration sheet waste into 2wt% sodium tetrapolypropylene benzene sulfonate and soak for 10h at 30°C, stirring continuously in the middle, cleaning to remove organic impurities such as oil, filtering, crushing and grinding, and obtaining the particle size It is 0.1mm tellurium-containing material powder.

[0037] (2) Prepare a hydrochloric acid solution with a concentration of 6mol / L, measure 500mL of the hydrochloric acid solution according to the solid-liquid mass volume ratio of 1:5, and add the tellurium-containing material powder and the hydrochloric acid solution into the reaction vessel.

[0038] (3) Raise the reaction temperature in step 2 to 60° C., slowly add sodium chlorate whose mass is 0.5 times the mass of tellurium metal, keep the reaction for 1 hour, filter, and collect the filtrate A.

[0039] (4) Raise the reaction temperature to 75° C., add hydroxylamine hydrochloride whose mass is 5 times that ...

Embodiment 3

[0043] (1) Add 160g of bismuth telluride-based semiconductor refrigeration chip waste into 8wt% sodium carbonate solution and soak at 60°C for 6 hours, stirring continuously in the middle, cleaning and removing organic impurities such as oil, filtering, crushing and grinding to obtain a particle size of 0.1mm containing Tellurium material powder.

[0044] (2) Prepare a hydrochloric acid solution with a concentration of 5 mol / L, measure 960 mL of the hydrochloric acid solution according to the solid-liquid mass volume ratio of 1:6, and add the tellurium-containing material powder and the hydrochloric acid solution into the reaction vessel.

[0045] (3) Raise the reaction temperature in step 2 to 70° C., slowly add calcium hypochlorite whose mass is 1 times the mass of tellurium metal, keep the reaction for 3 hours, filter, and collect the filtrate A.

[0046] (4) Raise the reaction temperature to 80° C., add hydrazine hydrate whose mass is 6 times the mass of selenium metal to ...

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Abstract

The invention relates to the technical field of nonferrous metal recovery, and discloses a method for recovering tellurium from bismuth telluride-based thermoelectric cooler wastes. The method comprises the following steps: washing, settling, crushing and grinding the bismuth telluride-based thermoelectric cooler wastes to obtain a tellurium-containing material powder, performing acid leaching onthe material powder by using hydrochloric acid, adding an oxidant to perform oxidization, adding a reducing agent to remove selenium impurities, and performing neutralizing precipitation to obtain tellurium dioxide filter residues; and mixing the tellurium dioxide filter residues, water and sodium hydroxide to prepare a sodium tellurite electrolyte, filtering the electrolyte to remove bismuth andantimony impurities, and performing electrodeposition to finally obtain metal tellurium. The bismuth telluride-based thermoelectric cooler wastes are treated through oxidation and acid-leaching processes to recover the metal tellurium. The recovery method does not require high-temperature calcining, so the energy consumption, the cost and the environmental impact are reduced; and the method can beused to treat P-type and N-type coolers without classification, so the method has high applicability. The method has the advantages of high yield and stable quality of tellurium, and easiness in industrialization.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal recovery, in particular to a method for recovering tellurium from waste materials of bismuth telluride-based semiconductor refrigeration chips. Background technique [0002] Semiconductor cooling chip, also called thermoelectric cooling chip, is a cooling technology that produces negative thermal resistance. It uses the Peltier effect to achieve refrigeration, has no moving parts, no refrigerant, and has high safety and reliability. At present, the commonly used semiconductor refrigeration chip material in China is a ternary solid solution alloy based on bismuth telluride. The crystal material is extracted by vertical zone melting method, and the P type is Bi 2 Te 3 —Sb 2 Te 3 material, N type is Bi 2 Te 3 —Bi 2 Se 3 Material. Refrigeration sheets are widely used in refrigeration and heating, such as infrared detection, cold trap, low temperature tester, air conditioner, water d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
CPCC01B19/02Y02P10/20
Inventor 王刚王瑞林姜春萍陈金伟
Owner SICHUAN UNIV
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