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Method for analyzing selenium content in crude selenium

A technology of content and crude selenium, applied in the direction of weighing by removing certain components, preparation of test samples, etc., can solve the problems that there is no analysis method for crude selenium, crude selenium is not in the scope of application, and affects the measurement results, etc., to eliminate Main interference elements, large promotion value, wide range of analysis effects

Active Publication Date: 2014-02-19
铜陵有色金属集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no corresponding and unified analysis method for crude selenium. Most of them refer to the non-ferrous industry standard "YS / T 226.12-2009 Selenium Chemical Analysis Method Part 12: Determination of Selenium Sodium Thiosulfate Volumetric Method", but crude selenium is not in its scope of application. And tellurium in crude selenium seriously affects the measurement results, leading to disputes and disputes

Method used

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  • Method for analyzing selenium content in crude selenium
  • Method for analyzing selenium content in crude selenium
  • Method for analyzing selenium content in crude selenium

Examples

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Effect test

Embodiment 1

[0020] Example 1: (1) Dry the sample, take a sample with a particle size of 0.098mm, dry it in an oven at 100°C for 2 hours, and place it in a desiccator to cool to room temperature;

[0021] (2), weigh the sample, weigh 2.0g of the sample in step (1) and record it as m 0 , accurate to 0.0001g;

[0022] (3) For measurement, put the sample in step (2) into a 500mL Erlenmeyer flask, add 7mL of nitric acid, and digest it completely in a 70°C water bath, then add 21mL of hydrochloric acid, and after it is completely dissolved, take it out and let it cool naturally , transfer the cooled solution into a 200mL volumetric flask, dilute to 200.00mL with water, and shake well;

[0023] (4) Dry filter the solution in step (3) into a clean and dry conical beaker, discard the first 20mL of filtrate, pipette 100.00mL of filtrate into a 500mL conical beaker, add 60mL of hydrochloric acid, shake well, Slowly add 50mL of hydrazine hydrate dropwise, slowly heat at low temperature until the so...

Embodiment 2

[0031] Example 2: (1) Dry the sample, take a sample with a particle size of 0.090mm, dry it in an oven at 105°C for 2 hours, and place it in a desiccator to cool to room temperature;

[0032] (2), weigh the sample, weigh 2.0g of the sample in step (1) and record it as m 0 , accurate to 0.0001g;

[0033] (3) For measurement, put the sample in step (2) into a 500mL Erlenmeyer flask, add 7mL of nitric acid, and digest it completely in a water bath at 80°C, then add 21mL of hydrochloric acid, and after it is completely dissolved, take it out and let it cool naturally , transfer the cooled solution into a 200mL volumetric flask, dilute to 200.00mL with water, and shake well;

[0034] (4) Dry filter the solution in step (3) into a clean and dry conical beaker, discard the first 20mL of filtrate, pipette 100.00mL of filtrate into a 500mL conical beaker, add 60mL of hydrochloric acid, shake well, Slowly add 50mL of hydrazine hydrate dropwise, slowly heat at low temperature until the...

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Abstract

The invention discloses a method for analyzing selenium content in crude selenium. The method comprises the following steps: dissolving sample acid, filtering, separating interference of acid-insoluble elements, reducing by using hydrazine hydrate, filtering, separating partial interference elements, precipitating, further dissolving in acid, testing tellurium by using a spectrograph, eliminating main interference elements, testing the selenium content of the filtrate by using the spectrograph, and modifying the analysis result. According to the method, a classical weight method is adopted for measurement, main interference elements are eliminated, loss of selenium in the filtrate is compensated, the result of the method is accurate and reliable, the analysis range is wide, not only is the crude selenium tested, but also pure selenium with the selenium content less than 99.9% can be tested, and great popularization values are achieved.

Description

technical field [0001] The invention relates to a method for analyzing selenium content in crude selenium. Background technique [0002] Selenium is an important industrial raw material and one of the essential trace elements for animals and human body. Selenium is rare and scattered in nature, and there are few concentrated deposits, and the content in the earth's crust is one part per 100,000,000. Selenium is often used in the manufacture of photosensitive elements, optical instruments, and electrical components due to its light-sensitivity and semiconductor properties. In metallurgy, glass, chemical and other industrial fields, selenium has been widely used; in nutrition, medicine, and life sciences, it is an important trace element for the human body. At the beginning of the 20th century, the production of selenium began in the world, but due to the influence of many factors such as the scarcity of selenium resources, extremely low content, complex extraction process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04G01N1/44
Inventor 梁海卫龚昌合朱新生陈燕陈丽
Owner 铜陵有色金属集团股份有限公司
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