Method for preparing high-purity tellurium by using tellurium dioxide

A technology of tellurium dioxide and high-purity tellurium, which is applied in the field of separation chemistry, can solve the problems of large amount of process reagents, difficulty in ensuring purity, and difficult operation, and achieve significant social benefits, simplified production process, and simple process.

Inactive Publication Date: 2013-01-16
LIAONING UNIVERSITY
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Problems solved by technology

Chemical method, on the one hand, due to the large amount of process reagents, the purity is difficult to guarantee; on the other hand, the metho

Method used

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Examples

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Embodiment 1

[0027] Example 1 Preparation of high-purity tellurium from tellurium dioxide

[0028] Raw materials: commercially available tellurium dioxide, which mainly contains elements such as Se, Mo, Cd, Sb, Pb, Cu, Zn, etc. After calculation, the purity of tellurium dioxide in this material is 99.977%, and the tellurium content is 79.856%, listed in Table 1.

[0029] Each impurity content in tellurium dioxide in table 1

[0030] element content element content Se 195300 ppb Sb 23140 ppb Mo 10290 ppb Pb 30.60 ppb Cd 19.721 ppb Cu 9.3 ppb Zn 42.21 ppb

[0031] Method: Dissolve 1 g of tellurium dioxide in 10 mL of NaOH, adjust the pH to 13, stir for 3 h, and filter. Add 0.1 mol / L Na to the above filtrate 2 S solution, use lead acetate test paper to detect the end point (the test paper turns black), stir for 2 hours to remove impurity ions, filter to obtain sodium tellurite solution. Add 0.8 mL of 30% hydrogen peroxide s...

Embodiment 2

[0035] Example 2 Preparation of high-purity tellurium from tellurium dioxide

[0036] Raw materials: commercially available tellurium dioxide, which mainly contains Se, Mo, Cd, Sb, Pb, Cu, Zn and other elements, the purity of tellurium dioxide in this material is calculated to be 99.983%, and the tellurium content is 79.860%, listed in the table 3 in.

[0037] Table 3 Contents of impurities in tellurium dioxide

[0038] element content element content Se 139900 ppb Sb 22490 ppb Mo 8725 ppb Pb 30.16 ppb Cd 2.054 ppb Cu 8.7 ppb Zn 38.00 ppb

[0039] Method: Dissolve 1 g of tellurium dioxide in 10 mL of NaOH, adjust the pH to 13, stir for 3 h, and filter. Add 0.1 mol / L Na to the filtrate 2 S solution, use lead acetate test paper to detect the end point, stir for 2 hours to remove impurity ions, filter to obtain sodium tellurite solution, add 0.8 mL of 30% hydrogen peroxide solution to the sodium tellurite solu...

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Abstract

The invention relates to a method for preparing high-purity tellurium by using tellurium dioxide. According to the technical scheme, the method comprises the following steps of: dissolving the tellurium dioxide by using NaOH, regulating the pH value of the dissolved tellurium dioxide to 13, stirring for 3h, filtering, adding a Na2S solution into a filtrate, detecting an end point by using lead acetate test paper, stirring for 2h to remove foreign ions, and filtering; adding a hydrogen dioxide solution into a sodium tellurite solution, stirring for 4h in an ice-water bath to generate a sodium tellurate precipitate, filtering, washing by using absolute ethanol, and drying to obtain sodium tellurate; dissolving the sodium tellurate in 6 mol/L hydrochloric acid, heating to 75 DEG C, introducing sulfur dioxide gas to generate tellurium, and filtering; and stirring at the temperature of 60 DEG C for 1h in the 2 mol/L hydrochloric acid, filtering, washing by using second boiling water until the acidity is not acid, and drying to obtain high-purity tellurium. By the method, the yield of the tellurium can reach 70.12 percent, and the product purity of the tellurium is more than 99.99 percent.

Description

technical field [0001] The invention belongs to the field of separation chemistry, in particular to a method for removing impurities from tellurium dioxide and preparing high-purity tellurium. Background technique [0002] Scattered element tellurium is known as "the vitamin of modern industry, national defense and cutting-edge technology, the bridge to create miracles on earth", and "the supporting material of contemporary high-tech new materials". This is because with the increasing requirements for scattered metals including tellurium in the fields of aerospace, atomic energy, and electronics industry, tellurium has become a supporting material for new materials required for electronic computers, communications and aerospace development, energy, and medicine and health. [0003] Commercially pure tellurium (99%) is widely used as an alloying additive to improve the machinability of steel and steel. Only a small amount of tellurium can improve the cutting and processing p...

Claims

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Application Information

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IPC IPC(8): C01B19/02
Inventor 单炜军娄振宁熊英常晓红房大维
Owner LIAONING UNIVERSITY
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