Method for preparing tellurium dioxide by using crude tellurium as raw material

A technology for tellurium dioxide and raw materials is applied in the field of preparing tellurium dioxide, which can solve problems such as human injury and environmental pollution, and achieve the effects of easy operation, reduction of environmental pollution and simple process.

Inactive Publication Date: 2010-02-17
SICHUAN XINJU MINERAL RESOURCE DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The advantage of above-mentioned prior art is: the technological process of preparing tellurium dioxide by crude tellurium is short, and product quality is better, and loss of tellurium is few, and deficiency is that a large amount of NO, NO are produced because of the process of nitric acid oxidation thick tellurium 2 Toxic and harmful gases, causing serious environmental pollution and human injury, especially in mass production

Method used

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  • Method for preparing tellurium dioxide by using crude tellurium as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Put 100 kg of crude tellurium containing 50% into a reaction kettle with a stirrer and a thermometer, add hydrogen peroxide with a concentration of 12%, add crude tellurium according to the liquid-solid ratio = 3, and grind the crude tellurium into an average particle size of ~ 74μm fine powder, tellurium content ≥ 50%, stir evenly, heat to boiling, react for 1.5h, filter, the filter residue still contains a small amount of tellurium, return to the next oxidation, the filtrate containing orthotelluric acid requires no solid suspended matter, clear and transparent;

[0042] Add hydrochloric acid with a concentration of 36% to the above-mentioned orthotelluric acid solution, the dosage is 2.5 times the weight of tellurium powder, heat to boiling, and react for 1.5h. During this process, a small amount of chlorine gas escapes, and the ventilation and protection are strengthened. TeCl 4 The yellow-green clear liquid continued to concentrate to 3 / 4 of its original volume.

...

Embodiment 2

[0046] Put 100 kg of crude tellurium containing 50% into a reaction kettle with a stirrer and a thermometer, add hydrogen peroxide with a concentration of 15%, add crude tellurium according to liquid-solid ratio = 3, and grind the crude tellurium into an average particle size of ~ 74μm fine powder, tellurium content ≥ 50%, stir evenly, heat to boiling, react for 2.5h, filter, the filter residue still contains a small amount of tellurium, return to the next oxidation, the filtrate containing orthotelluric acid requires no solid suspended matter, clear and transparent;

[0047] Add hydrochloric acid with a concentration of 36% to the above-mentioned orthotelluric acid solution, the dosage is 3 times the weight of tellurium powder, heat to boiling, and react for 3 hours. During this process, a small amount of chlorine gas escapes, and the ventilation and protection are strengthened. TeCl 4 Yellow-green clear liquid, continue to concentrate to 1 / 2 of the original volume.

[0048]...

Embodiment 3

[0051] Put 100 kg of crude tellurium containing 50% into a reaction kettle with a stirrer and a thermometer, add hydrogen peroxide with a concentration of 12%, add crude tellurium according to the liquid-solid ratio = 3, and grind the crude tellurium into an average particle size of ~ 74μm fine powder, tellurium content ≥ 50%, stir evenly, heat to boiling, react for 2 hours, filter, the filter residue still contains a small amount of tellurium, return to the next oxidation, the filtrate containing orthotelluric acid requires no solid suspended matter, clear and transparent;

[0052] Add hydrochloric acid with a concentration of 36% to the above-mentioned orthotelluric acid solution, the dosage is 2.8 times the weight of tellurium powder, heat to boiling, and react for 2 hours. During this process, a small amount of chlorine gas escapes, and the ventilation and protection are strengthened. TeCl 4 Yellow-green clear liquid, continue to concentrate to 1 / 2 of the original volume. ...

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Abstract

The invention discloses a method for preparing tellurium dioxide by using crude tellurium as the raw material, which is characterized in that hydrogen peroxide is used as an oxidizer for oxidizing thecrude tellurium, hydrochloric acid is used as a reducer to reduce the oxidized sexivalent tellurium into quadrivalent tellurium, and at last alkali is used for neutralization to obtain tellurium dioxide. The invention does not produce toxic or harm gases, greatly reduces environmental pollution and damage to human bodies, and is good for industrial production.

Description

technical field [0001] The invention relates to a method for preparing tellurium dioxide by using crude tellurium as a raw material, belonging to the field of metallurgical purification. Background technique [0002] Crude tellurium refers to the impurity-containing tellurium product with a purity of <3N, that is, the product purity is between >50% and <99.9%, and the total amount of impurities is 0.01-10.00%. Sponge tellurium or metal tellurium produced in ore, as well as scraps generated during the use of high-purity tellurium products, 4N tellurium vacuum distillation scraps and electrodeposited tellurium below 4N. [0003] A method for preparing tellurium dioxide from crude tellurium with a purity of <3N has been reported. Edited by Song Yulin and Dong Zhenjian. Rare Metal Chemistry. Liaoning University Press, Shenyang, 1991, pp. 208-228; edited by Zhou Lingzhi, Chen Shaochun. Sparse Metal Extraction Metallurgy. Metallurgical Industry Press, 2008 Beijing, pp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
Inventor 侯龙超侯仁义范良明
Owner SICHUAN XINJU MINERAL RESOURCE DEV CO LTD
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