Analytical method for determining tellurium in high-selenium tellurium slag

An analysis method, the technology of tellurium slag, applied in the field of chemical analysis, can solve the problems of difficult accurate measurement of tellurium content, difficult analysis of results, and long time consumption, so as to avoid the impact on the test, ensure accuracy, acceleration rate and completeness Effect

Active Publication Date: 2016-03-30
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Tellurium slag, an intermediate product of smelting, mainly comes from the copper smelting process, which mainly contains tellurium with a general content of several percent to tens of percent, selenium with a general content of several percent to more than ten percent, and copper with a general content of 100 percent. The silver content is generally a few percent; because the general tellurium slag contains selenium as an impurity element, and its chemical properties are similar to tellurium, it is difficult to accurately determine the tellurium content in the tellurium slag; the traditional method uses heavy chromium The method of potassium acid potassium oxidation takes a long time, and it is difficult to quickly obtain analysis results to guide industrial production

Method used

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  • Analytical method for determining tellurium in high-selenium tellurium slag
  • Analytical method for determining tellurium in high-selenium tellurium slag
  • Analytical method for determining tellurium in high-selenium tellurium slag

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Experimental program
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Embodiment 1

[0020] (1) Accurately weigh 0.5000g of a certain tellurium slag sample in a 400mL beaker, pour a small amount of water to moisten the sample, add 15mL 15mol / L concentrated nitric acid, heat and boil until the sample is completely dissolved, add 15mL sulfuric acid (1+1) and heat to After the sulfuric acid fumes are removed and cooled, diluted with a small amount of water, add 10mL of 6.8mol / L hydrobromic acid, continue to heat until the sulfuric acid fumes are exhausted, and then remove, add 12mol / L hydrochloric acid 10mL and boil until the solution is steamed to nearly dry. Add 20mL hydrochloric acid (1+1) to flush with water to about 150mL, heat the solution to near boiling to dissolve the salts, add dropwise 50g / L silver sulfate solution until there is no silver chloride precipitation in the solution, filter with medium speed filter paper, and retain the filtrate ;

[0021] (2) Add 0.01mol / L potassium permanganate standard solution to the above-mentioned filtrate until the colo...

Embodiment 2

[0025] (1) Accurately weigh 0.4000g of a certain tellurium slag sample into a 400mL beaker, pour a small amount of water to moisten the sample, add 15mL of 15mol / L concentrated nitric acid, heat and boil until the sample is completely dissolved, add 15mL sulfuric acid (1+1) to heat to Sulfuric acid fumes, take off and cool, dilute with a small amount of water, add 10mL of 6.8mol / L hydrobromic acid, continue to heat until the sulfuric acid fumes are exhausted, then remove, add 12mol / L of 10mL hydrochloric acid and boil until the solution is steamed to nearly dry After that, add 20mL hydrochloric acid (1+1) to rinse to about 150mL, heat the solution to near boiling to dissolve the salts, add 50g / L silver sulfate solution dropwise until there is no silver chloride precipitation in the solution, filter with medium speed filter paper , Keep the filtrate;

[0026] (2) Add 0.01mol / L potassium permanganate standard solution to the above-mentioned filtrate until the color of the solution ...

Embodiment 3

[0030] (1) Accurately weigh 0.3000g of a certain tellurium slag sample into a 400mL beaker, pour a small amount of water to moisten the sample, add 10mL 15mol / L concentrated nitric acid, heat and boil until the sample is completely dissolved, add 10mL sulfuric acid (1+1) and heat to Sulfuric acid fumes, take off and cool, dilute with a small amount of water, add 10mL of 6.8mol / L hydrobromic acid, continue heating until the sulfuric acid fumes are exhausted, then remove, add 12mol / L of hydrochloric acid 10mL, heat and boil until the solution is almost dry After that, add 20mL hydrochloric acid (1+1) to flush with water to about 150mL, heat the solution to near boiling to dissolve the salts, add 50g / L silver sulfate solution dropwise until there is no silver chloride precipitation in the solution, filter with medium speed filter paper, Retain the filtrate;

[0031] (2) Add 0.01mol / L potassium permanganate standard solution to the above-mentioned filtrate until the color of the solu...

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Abstract

The invention provides an analytical method for determining tellurium in high-selenium tellurium slag. According to the analytical method, a sample is dissolved in nitric acid and sulfuric acid, sulfuric acid smokes to volatilize and remove selenium in a bromide form, high-valence tellurium (VI) is quantitatively reduced into low-valence tellurium (IV) in a hydrochloric acid medium with the concentration higher than 10mol/L, the interference of chloride ions is eliminated by silver sulfate in a silver chloride precipitate form, low-valence tellurium (IV) is quantitatively oxidized into high-valence tellurium (VI) by potassium hypermanganate, excessive potassium hypermanganate is reduced by ferrous sulfate, and therefore, the content of tellurium in a sample is indirectly determined; tellurium in the high-selenium tellurium slag is analyzed and determined by carrying out indirect titration on ferrous sulfate through taking hydrochloric acid as a reducing agent and a complexing agent and potassium hypermanganate as an oxidizing agent, so that the predicament that tellurium in the high-selenium tellurium slag is difficultly and accurately determined in a recovery process is solved. The method has the advantages of good separation effect, high recovery rate, high accuracy, and the like.

Description

Technical field [0001] The invention belongs to the field of chemical analysis, and specifically relates to an analysis method for determining tellurium in high-selenium tellurium slag. Background technique [0002] Tellurium is a sparse non-metallic element. In nature, tellurium has both associated and independent deposits. It is mainly used as a catalyst for petroleum cracking, a brightener for electroplating solution, and a coloring material for glass. It is added to steel to increase its ductility, and it is added to lead to increase its strength and corrosion resistance. Tellurium and its compounds are another semiconductor material. By consulting the literature, there are many methods for the determination of tellurium in tellurium dioxide products, and there are even relevant national standards. There are few related literatures on the chemical analysis methods of tellurium in the tellurium slag of smelting intermediate products, especially those with high selenium conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
CPCG01N21/79
Inventor 郑省政余江鸿王同敏王红燕方彦霞路军兵张彦翠齐白羽赵海军展之旺谷雅楠
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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