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A method for separation and recovery of tellurium dioxide in cuprous telluride compound waste

A cuprous telluride, separation and recovery technology is applied in the directions of binary selenium/tellurium compounds, selenium/tellurium oxides/hydroxides, etc., which can solve the problems of inability to directly obtain economic benefits, such as tellurium dioxide, and improve the additional economy. The effect of efficiency, high market competitiveness and short process

Active Publication Date: 2020-10-30
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

[0004] At present, in the domestic treatment of cuprous telluride intermediate materials produced in copper anode slime, there are acid leaching, alkali leaching wet treatment process and sulfuration roasting pretreatment fire process in the front stage, and chemical reduction, alkali leaching process in the latter stage. Liquid electrowinning, extraction-reduction and other methods, the product is generally metal tellurium, and it is impossible to directly obtain tellurium dioxide with higher economic benefits; and there is no disclosure about the separation and recovery of tellurium dioxide from cuprous telluride compound waste in the prior art Literature and Patents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) 510g of cuprous telluride compound waste with a tellurium content of 47.4% was crushed and sieved to obtain a powder with a particle size of 0.075mm; then the above powder was added to 5mol / L dilute hydrochloric acid and stirred, wherein the , The substance ratio of tellurium element and chloride ion is 1:6, then heated to 50°C, and 50% hydrogen peroxide is added dropwise, the amount of hydrogen peroxide added is the theoretical amount (oxidizing tellurium from -2 to +4 tetrachloride Tellurium chloride, copper is oxidized from +1 valence to +2 valence copper chloride, 300% of the amount of hydrogen peroxide used in theory), so that both tellurium and copper are dissolved, and after filtration, a blue solution is obtained.

[0054] (2) Slowly add 3 mol / L sodium hydroxide solution dropwise to the blue solution obtained in step (1), keep the pH at 13, and at 65° C., after stirring for 4 hours, filter out the copper-containing precipitate to obtain a solution containing ...

Embodiment 2

[0060] (1) 105g of cuprous telluride compound waste with a tellurium content of 45.5% was broken and sieved to obtain a powder with a particle size of 0.075mm; then the above powder was added to 5mol / L dilute hydrochloric acid and stirred, wherein the copper , The substance ratio of tellurium element and chlorine ion is 1:5, then heated to 60 ° C, and 20% hydrogen peroxide is added dropwise, the amount of hydrogen peroxide added is the theoretical amount (oxidizing tellurium from -2 to +4 tetrachloride Tellurium chloride, copper is oxidized from +1 valence to +2 valence copper chloride, 300% of the amount of hydrogen peroxide used in theory), so that both tellurium and copper are dissolved, and after filtration, a blue solution is obtained.

[0061] (2) Slowly add 4mol / L sodium hydroxide solution dropwise to the blue solution obtained in step (1), keep the pH at 14, and at 60° C., after stirring for 5 hours, filter out the copper-containing precipitate to obtain a solution cont...

Embodiment 3

[0065] (1) 186g of cuprous telluride compound waste with a tellurium content of 42.1% was crushed and sieved to obtain a powder with a particle size of 0.045mm; then the above powder was added to 3mol / L dilute hydrochloric acid and stirred, wherein copper , The substance ratio of tellurium element and chloride ion is 1:4.5, and then heated to 40 ° C, and 30% hydrogen peroxide is added dropwise. Tellurium chloride, copper is oxidized from +1 valence to +2 valence copper chloride (the amount of hydrogen peroxide used in theory) is 200%, so that both tellurium and copper are dissolved, and after filtration, a blue solution is obtained.

[0066] (2) Slowly add 5 mol / L sodium hydroxide solution dropwise to the blue solution obtained in step (1), keep the pH at 14, and at 50° C., after stirring and reacting for 3 hours, filter out the copper-containing precipitate to obtain a solution containing tellurium filtrate; then slowly dropwise add 0.2mol / L Na to the above-mentioned telluriu...

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Abstract

The invention provides a separation and recycling method for TeO2 in a cuprous telluride compound waste material. The method includes the following steps: a) mixing the cuprous telluride compound waste material with diluted hydrochloric acid and H2O2 and filtering the mixture to prepare a mixed solution, wherein the molar concentration of the diluted hydrochloric acid is 3-5 mol / L; b) performing alkali conversion to precipitate copper, sulfurization, calcium adding to remove impurities, and neutralization to precipitate tellurium to the mixed solution in the step a) to obtain a tellurium-containing precipitate; c) drying the tellurium-containing precipitate to prepare high-purity TeO2 powder. Compared with the prior art, in the hydrochloric acid and H2O2 system, the TeO2 is directly separated and recycled from the cuprous telluride compound waste material by controlling special processes; the method has high yield and is high in purity of the separated and recycled TeO2, thus achievingbetter cyclic utilization of the rare and dispersed tellurium. A test result proves that the method in the invention is not less than 93% in yield and is 99.99% in purity of the produced TeO2.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of scattered metal elements, in particular to a method for separating and recovering tellurium dioxide from cuprous telluride compound waste. Background technique [0002] Cuprous telluride is blue-black with a density of 7.27g / cm 3 , melting point 1125 ℃, relatively stable in the air at room temperature, insoluble in hydrochloric acid and sulfuric acid, can be obtained by vacuum smelting after high-purity copper and high-purity tellurium are dosed according to stoichiometric ratio. Cuprous telluride can be used as an intermediate alloy, and also has important uses in photoelectric conversion materials such as zinc telluride thin films and cadmium zinc telluride thin films for solar cells. [0003] As a kind of scattered element, tellurium is mostly extracted comprehensively as an associated component in the smelting process of non-ferrous metals such as copper, lead, and zinc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04
CPCC01B19/004C01P2006/80
Inventor 刘运连朱刘狄聚青胡智向
Owner 昆明先导新材料科技有限责任公司
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