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Method for accurately detecting contents of platinum, palladium and rhodium in waste automobile exhaust catalyst

An automobile exhaust and catalyst technology is applied in the field of palladium to accurately detect platinum and rhodium content in waste automobile exhaust catalysts, which can solve the problems that platinum group metal detection cannot be well applied, and platinum group metal detection is not seen, so as to avoid Matrix interference, avoiding the presence of metallic bismuth, reducing the effect of heat loss

Active Publication Date: 2019-12-03
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bismuth assay gold has not been used for the detection of platinum group metals in waste automobile catalysts, and the detection methods in the above reports are highly specific to samples, while the main components of waste automobile exhaust catalysts, the grade of platinum group metals and The physical phase is quite different from the above-mentioned reports, so the process method is not suitable for the detection of platinum group metals in waste automobile catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Step 1: Ingredients

[0060] 1.2kg of waste automobile exhaust catalyst is coarsely crushed and finely crushed so that the particle size is less than 3mm, mixed evenly and then divided to take out a quarter, its weight is 301.25g, dried in a 115°C drying oven to constant weight, calculated The moisture content is 7.81%. Grind all the dried samples on a vibrating sample maker for 30 minutes, put all the samples into sample bags and seal them. When sampling, hold the sample bag with both hands and fold it diagonally several times to mix the sample evenly, weigh 1.0000g of the sample and put it into a clay crucible, add 90.0g of bismuth subcarbonate, and then add the mass ratio of potassium carbonate to sodium A 1:1 mixture of 62g, silicon dioxide 40g and boric acid 1.77g is a co-solvent, then add 5.5g corn flour and stir evenly, sweep down the material adhering to the crucible wall, lightly tap twice, and dig a hole in the middle of the ingredients For a small hole as de...

Embodiment 2

[0070] Step 1: Ingredients

[0071] 0.9kg of waste automobile exhaust catalyst is coarsely crushed and finely crushed to make the particle size less than 2mm, mixed evenly, and then divided to take out a quarter, its weight is 240.11g, dried in a 110°C drying oven to constant weight, calculated The moisture content is 3.77%. Grind all the dried samples on a vibrating sample maker for 25 minutes, put all the samples into sample bags and seal them. When sampling, hold the sample bag with both hands and fold it diagonally several times to mix the sample evenly, weigh 4.5000g of the sample and put it into a clay crucible, add 45g of bismuth oxide and 35g of bismuth hydroxide, add 45g of sodium carbonate, and 35g of potassium oxalate, 10g silicon powder, 9.01g borax, 5.4g boric acid, add 5.4g wheat flour and stir evenly, sweep down the material adhering to the crucible wall, tap it lightly 5 times, dig a small hole as deep as possible in the middle of the ingredients, add 5mL of 1...

Embodiment 3

[0080] Step 1: Ingredients

[0081] 1.3kg of waste automobile exhaust catalyst was coarsely crushed and finely crushed to make the particle size less than 4mm, mixed evenly, and then shrunk to take out a quarter, and its weight was 321.25g, dried in a 105°C drying oven to constant weight, calculated The moisture content is 5.52%. Grind all the dried samples on a vibrating sample maker for 20 minutes, put all the samples into sample bags and seal them. When sampling, hold the sample bag with both hands and fold it diagonally several times to mix the sample evenly. Weigh 3.0000g of the sample and put it into a clay crucible, add 45g of bismuth oxide and 15g of bismuth oxychloride, add 45g of ETDA, 35g of potassium propionate, silicon sodium borohydride 40g, sodium borohydride 2.6g, then add 2g of activated carbon and stir evenly, sweep down the material adhering to the crucible wall, tap it lightly for 3 times, dig a small hole as deep as possible in the middle of the ingredient...

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Abstract

The invention, which belongs to the field of platinum group metal analysis and detection, discloses a method for accurately detecting contents of platinum, palladium and rhodium in a waste automobileexhaust catalyst. According to the invention, burdening, smelting trapping, ash blowing separation of metal bismuth and platinum, palladium and rhodium content detection are performed based on bismuthtest gold pyrometallurgy metal enrichment technological process and the process optimization is performed, so that problems of matrix interference and incapability of ash blowing in the traditional method are solved and a defect that platinum, palladium and rhodium in the waste automobile tail gas catalyst are difficult to effectively capture, separate and detect by adopting the existing method is overcome. Therefore, the recovery rate of platinum, palladium and rhodium is increased and the accurate detection of the contents of platinum, palladium and rhodium in the waste automobile tail gascatalyst is ensured.

Description

technical field [0001] The invention belongs to the field of analysis and detection of platinum group metals, and more specifically relates to a method for accurately detecting the contents of platinum, palladium and rhodium in waste automobile exhaust catalysts. Background technique [0002] my country's platinum group metal mineral resources are extremely poor, and the prospective reserves are only about 350t, which does not exceed 0.5% of the world's total reserves. However, my country is a major consumer of platinum group metals in the world. In 2017, the consumption of platinum and palladium reached 63.8t and 82.6t respectively, which are mainly used in the field of automobile exhaust catalysts. Automobile exhaust catalysts are called "urban mobile platinum group metal mines". Carrying out the efficient utilization of secondary resources and comprehensive recovery of platinum group metals is of great significance for solving the serious shortage of platinum group metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73C22B7/00C22B11/02G01N1/38G01N1/44
CPCC22B7/001C22B11/026G01N1/38G01N1/44G01N21/73
Inventor 张福元徐娟赵卓汪尚兵张广安
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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