Method for leaching platinum, palladium and rhodium from spent ternary catalyst

A three-way catalyst and waste catalyst technology, which is applied in the leaching of palladium and rhodium, and the field of platinum in waste three-way catalysts, can solve the problems of difficult separation of metal and slag, high viscosity of slag, difficult process, etc., and achieves good applicability and excellent treatment The effect of low cost and short process

Inactive Publication Date: 2018-07-10
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the plasma smelting method is used to process the honeycomb celite carrier auto catalyst, there are two shortcomings: one is that the slag generated by the celite has a high viscosity, and it is difficult to separate the metal from the slag; the other is that at the smelting temperature, if there is carbon (Often), at least a part of the silicon dioxide in zeolite is reduced to elemental silicon, which forms high ferrosilicon with iron added as a collector for platinum group metals, and ferrosilicon forms a new alloy phase with platinum group metals. This alloy has Extremely strong anti-acid and anti-alkali properties make the follow-up process very difficult

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  • Method for leaching platinum, palladium and rhodium from spent ternary catalyst

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Embodiment 1

[0032] A kind of leaching method of platinum, palladium, rhodium in spent three-way catalyst comprises the following steps:

[0033] S1: Roasting the spent three-way catalyst, the calcination temperature is controlled at 300°C, and the calcination time is 2h;

[0034] S2: Crushing and grinding the roasted three-way spent catalyst, and controlling the particle size to 10 mesh after grinding;

[0035]S3: Reduce and transform the oxidized noble metal in the ground three-way waste catalyst into a single substance state. The process conditions for reduction and transformation are: temperature 60°C, liquid-solid ratio 3 / 1, time 3h;

[0036] S4: The three-way spent catalyst is made of cordierite 2MgO·2Al 2 o 3 ·5SiO2 2 As the substrate, an alumina active coating is used to coat it, and the active components contained in the catalyst are concentrated in the alumina coating; the alumina coating on the surface of the three-way waste catalyst carrier is dissolved with sulfuric acid, a...

Embodiment 2

[0046] A kind of leaching method of platinum, palladium, rhodium in spent three-way catalyst comprises the following steps:

[0047] S1: Roasting the spent three-way catalyst, the calcination temperature is controlled at 900°C, and the calcination time is 8h;

[0048] S2: Crushing and grinding the roasted three-way waste catalyst, and controlling the particle size to 200 mesh after grinding;

[0049] S3: Reductively transform the oxidized noble metal in the finely ground three-way spent catalyst into a single substance state. The process conditions for the reduction transformation are: temperature 90°C, liquid-solid ratio 3 / 1, time 3h;

[0050] S4: The three-way spent catalyst is made of cordierite 2MgO·2Al 2 o 3 ·5SiO2 2 As the substrate, an alumina active coating is used to coat it, and the active components contained in the catalyst are concentrated in the alumina coating; the alumina coating on the surface of the three-way waste catalyst carrier is dissolved with sulfur...

Embodiment 3

[0060] 600g of an automobile three-way waste catalyst, containing 0.064% of Pt, 0.136% of Pd, and 0.016% of Rh. The catalyst is based on cordierite (2MgO·2Al 2 o 3 ·5SiO2 2 ) is a carrier in the shape of a honeycomb cylinder, with carbon deposits on the surface and partly sintered. The X-ray fluorescence semi-quantitative full analysis results are shown in Table 1

[0061] Table 1 X-fluorescence semi-quantitative analysis results

[0062] Element

Al 2 o 3

SiO 2

MgO

CeO 2

P 2 o 5

Fe 2 o 3

ZrO 2

BaO

SO 3

content%

41.6

32.4

7.8

4.7

1.6

1.5

0.78

0.767

0.61

[0063] 600g of spent three-way catalyst was first calcined at 700°C for 4 hours, then crushed and ground to -100 mesh, and 1800ml of water was added to a 5-liter beaker, and the finely ground catalyst was added while stirring. After the temperature was raised to 60°C, 30ml of hydrazine hydrate was added for For reduction...

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Abstract

The invention relates to a method for leaching precious metals from a spent catalyst. The method is suitable for leaching platinum, palladium and rhodium from an automobile spent ternary tail gas catalyst. The method comprises the following steps: performing calcination decarburization at a proper temperature, crushing and grinding the obtained catalyst, performing reducing conversion, and performing two-stage countercurrent dissolving to leach the platinum, palladium and rhodium. The method for leaching the platinum, palladium and rhodium from the ternary tail gas catalyst through adopting awet process has the advantages of short process, low treatment cost and high precious metal leaching rate, and allows the platinum leaching rate to reach 96.5%, the palladium leaching rate to reach 98.4% and the rhodium leaching rate to reach 91.1%.

Description

technical field [0001] The invention belongs to the field of leaching methods, in particular to a method for leaching platinum, palladium and rhodium in spent three-way catalysts. Background technique [0002] After the 1970s, with the increasing emphasis on environmental protection in developed countries, the control of automobile exhaust pollution has become the focus of improving air quality. CO, unburned hydrocarbons (HC) and nitrogen oxides (NOx) in vehicle exhaust in some countries x ) The discharge of three harmful components has been restricted by legislation. Due to the unique purification ability of platinum group metals on automobile exhaust, CO, HC, NO x Converted to non-toxic CO 2 、H 2 O, N 2 , so platinum group metals are widely used in automobile exhaust purification catalysts. [0003] In 2000, my country fully implemented the National II emission standard, in 2007, the National III emission standard, and in 2010, the National IV emission standard was e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B7/00C22B1/02
CPCC22B1/02C22B11/048Y02P10/20
Inventor 杨志平
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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