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Method for Determination of Platinum Palladium Rhodium Content in Waste Automobile Exhaust Catalysts

A technology of automobile exhaust gas and measurement method, which is applied in the preparation of test samples, material excitation analysis, thermal excitation analysis, etc., can solve the problems of low accuracy of measurement results, complicated processing process, loss of precious metals, etc., and avoid matrix interference. , the enrichment method is simple and the cost is low

Active Publication Date: 2019-07-16
GEM WUHAN URBAN MINE RECYCLING IND PARK DEV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is more common in the prior art to use lead assay gold or nickel sulfide assay gold to enrich platinum, palladium and rhodium precious metals. However, due to the presence of a large amount of silicon and aluminum in the catalyst, lead assay gold needs to be added when enriching platinum, palladium and rhodium. Or silver is used as a protective agent to form gold or silver alloy to separate from a large amount of silicon and aluminum. The processing process is complicated and the cost is high; When the metal enters the solution, most of the precious metals are not dissolved and remain in the residue, while a small amount of precious metals enter the solution, resulting in the loss of precious metals, and the accuracy of the measurement results is not high

Method used

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  • Method for Determination of Platinum Palladium Rhodium Content in Waste Automobile Exhaust Catalysts
  • Method for Determination of Platinum Palladium Rhodium Content in Waste Automobile Exhaust Catalysts
  • Method for Determination of Platinum Palladium Rhodium Content in Waste Automobile Exhaust Catalysts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Reagents and instruments

[0041] All reagents used are of analytical grade.

[0042] 1.1 Reagent: anhydrous cuprous oxide; anhydrous sodium tetraborate; anhydrous sodium carbonate; anhydrous sea sand; anhydrous potassium hydrogen tartrate; concentrated nitric acid (65% HNO 3 ); Concentrated hydrochloric acid (37% HCl); 1.000g / L YNO 3 Solution; Copper matrix solution: Weigh 5.00g 99.8% copper powder, dissolve it with 15mL concentrated nitric acid and 60mL concentrated hydrochloric acid, transfer it into a 100mL volumetric flask, dilute to the mark with ultrapure water, and mix; platinum, palladium and rhodium standard solution (100μg / mL ): Pipette 10mL platinum standard solution (1000μg / mL), palladium standard solution (1000μg / mL) and rhodium standard solution (1000μg / mL) into a set of 100mL volumetric flasks, and add 10mL HNO 3 , Dilute to the mark with water and mix well.

[0043] 1.2 Apparatus: Jar (500mL); Clay crucible; Assay furnace; Balance (1 in 10,000); Sand bath; ...

Embodiment 2

[0080] 1. Reagents and instruments

[0081] All reagents used are of analytical grade.

[0082] 1.1 Reagent: anhydrous cuprous oxide; anhydrous sodium tetraborate; anhydrous sodium carbonate; anhydrous sea sand; anhydrous potassium hydrogen tartrate; concentrated nitric acid (65% HNO 3 ); Concentrated hydrochloric acid (37% HCl); 1.000g / L YNO 3 Solution; Copper matrix solution: Weigh 5.00g 99.8% copper powder, dissolve it with 15mL concentrated nitric acid and 60mL concentrated hydrochloric acid, transfer it into a 100mL volumetric flask, dilute to the mark with ultrapure water, and mix; platinum, palladium and rhodium standard solution (100μg / mL ): Pipette 10mL platinum standard solution (1000μg / mL), palladium standard solution (1000μg / mL) and rhodium standard solution (1000μg / mL) into a set of 100mL volumetric flasks, and add 10mL HNO 3 , Dilute to the mark with water and mix well.

[0083] 1.2 Apparatus: Jar (500mL); Clay crucible; Assay furnace; Balance (1 in 10,000); Sand bath; ...

Embodiment 3

[0120] 1. Reagents and instruments

[0121] All reagents used are of analytical grade.

[0122] 1.1 Reagent: anhydrous cuprous oxide; anhydrous sodium tetraborate; anhydrous sodium carbonate; anhydrous sea sand; anhydrous potassium hydrogen tartrate; concentrated nitric acid (65% HNO 3 ); Concentrated hydrochloric acid (37% HCl); 1.000g / L YNO 3 Solution; Copper matrix solution: Weigh 5.00g 99.8% copper powder, dissolve it with 15mL concentrated nitric acid and 60mL concentrated hydrochloric acid, transfer it into a 100mL volumetric flask, dilute to the mark with ultrapure water, and mix; platinum, palladium and rhodium standard solution (100μg / mL ): Pipette 10mL platinum standard solution (1000μg / mL), palladium standard solution (1000μg / mL) and rhodium standard solution (1000μg / mL) into a set of 100mL volumetric flasks, and add 10mL HNO 3 , Dilute to the mark with water and mix well.

[0123] 1.2 Apparatus: Jar (500mL); Clay crucible; Assay furnace; Balance (1 in 10,000); Sand bath; ...

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Abstract

The invention discloses a method for measuring the content of platinum, palladium and rhodium in waste automobile exhaust catalysts, which includes (1) reagent preparation; (2) melting and enriching platinum, palladium and rhodium metal; (3) drawing of standard working curve; (4) sample Dissolution determination; (5) Calculation of platinum, palladium and rhodium content in the sample. This method can effectively avoid matrix interference in the catalyst, and the measurement results have high accuracy and good reproducibility.

Description

Technical field [0001] The invention relates to the technical field of precious metal testing and analysis in waste automobile catalysts, and more specifically to a method for determining the content of platinum, palladium and rhodium in waste automobile exhaust catalysts. Background technique [0002] Most of the instrument analysis is solution injection, and the sample needs to be pre-treated and prepared into a solution before the precious metal content determination. For the determination of platinum, palladium, and rhodium content in waste automobile exhaust catalysts, platinum, palladium, and rhodium need to be separated from the catalyst and then measured. Methods for separating and enriching precious metals include fire assay and acid dissolution methods; The high temperature generated during use will cause the precious metals in the automobile exhaust catalysts to form precious metal oxides, and at the same time, the alumina will be denatured. The acid solution method is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/73G01N1/38G01N1/44
CPCG01N1/38G01N1/44G01N21/73Y02P10/20
Inventor 许开华周继锋
Owner GEM WUHAN URBAN MINE RECYCLING IND PARK DEV