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Method for measuring content of platinum, palladium, and rhodium in waste automobile exhaust catalyst

A technology of automobile exhaust gas and measurement method, which is applied in the field of precious metal testing and analysis in waste automobile catalysts, can solve the problems of low accuracy of measurement results, complicated processing process, loss of precious metals, etc. low effect

Active Publication Date: 2017-05-31
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 measuring content of platinum, palladium, and rhodium in waste automobile exhaust catalyst
  • Method for measuring content of platinum, palladium, and rhodium in waste automobile exhaust catalyst
  • Method for measuring content of platinum, palladium, and rhodium in waste automobile exhaust catalyst

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Experimental program
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Effect test

Embodiment 1

[0040] 1. Reagents and instruments

[0041] All reagents used were of analytical grade.

[0042] 1.1 Reagents: 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 / LYNO 3 solution; copper matrix solution: Weigh 5.00g 99.8% copper powder and 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 well; platinum palladium 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, add 10mL HNO 3 , diluted with water to the mark, and mixed.

[0043] 1.2 Instruments: jar (500mL); clay crucible; assay furnace; balance (1 / 10,000); san...

Embodiment 2

[0080] 1. Reagents and instruments

[0081] All reagents used were of analytical grade.

[0082] 1.1 Reagents: 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 / LYNO 3 solution; copper matrix solution: Weigh 5.00g 99.8% copper powder and 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 well; platinum palladium rhodium standard solution (100μg / mL ): pipette 10mL platinum standard solution (1000μg / mL), palladium standard solution (1000μg / mL) and rhodium standard solution (1000μg / mL) respectively in a set of 100mL volumetric flasks, add 10mL HNO 3 , diluted with water to the mark, and mixed.

[0083] 1.2 Instruments: jar (500mL); clay crucible; assay furnace; balance (1 / 1...

Embodiment 3

[0120] 1. Reagents and instruments

[0121] All reagents used were of analytical grade.

[0122] 1.1 Reagents: 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 and 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 well; platinum palladium rhodium standard solution (100μg / mL ): pipette 10mL platinum standard solution (1000μg / mL), palladium standard solution (1000μg / mL) and rhodium standard solution (1000μg / mL) respectively in a set of 100mL volumetric flasks, add 10mL HNO 3 , diluted with water to the mark, and mixed.

[0123] 1.2 Instruments: jar (500mL); clay crucible; assay furnace; balance (1 / ...

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Abstract

The invention discloses a method for measuring the content of platinum, palladium, and rhodium in a waste automobile exhaust catalyst. The method comprises the following steps: (1) preparing reagents; (2) fusing and enriching the metals namely platinum, palladium, and rhodium; (3) drawing a standard work curve; (4) dissolving a sample and measuring the solution; and (5) calculating the content of platinum, palladium, and rhodium. The method can effectively avoid the interference of the matrix in the catalyst, the measurement result is accurate, and the repeatability is good.

Description

technical field [0001] The invention relates to the technical field of testing and analyzing precious metals in waste automobile catalysts, 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 instrumental analysis is solution sampling, and before the determination of precious metal content, the sample needs to be pre-treated and prepared into a solution. Before the determination of platinum, palladium and rhodium content in waste automobile exhaust catalyst, it is necessary to separate platinum, palladium and rhodium from the catalyst and then measure them. The high temperature generated during use will cause the precious metals in the automobile exhaust catalyst to form precious metal oxides, and also cause denaturation of the alumina. The platinum, palladium, and rhodium in the catalyst are leached by the acid solution method, and the leaching effect i...

Claims

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Application Information

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Patent Type & Authority Applications(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
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