Method for recycling platinum group metal from waste catalysts

Abstract

The invention discloses a method for recycling platinum group metal from waste catalysts. The method comprises the following steps that (1) the waste catalysts containing the platinum group metal, nickel type collecting agents, calcium oxide and silicon dioxide are crushed and mixed uniformly according to a proportion; (2) the proportioned mixture is smelted at the high temperature, and the constant temperature is kept for a period of time, so that molten sulfonium with nickel as main components is deposited below a slag layer of metallic oxide; (3) water cooling is conducted on the sulfonium at the high temperature, so that metal particles are obtained; (4) the crushed metal particles are leached through sulfuric acid at the high pressure, and valuable metal such as nickel is recycled from leaching liquid; and (5) the platinum group metal is further extracted from leaching slag. Compared with the prior art, the method is simple in development process, good in enrichment effect and capable of being effectively used for separation and extraction of valuable metal in the waste catalysts.

Description

technical field

[0001] The invention belongs to the technical field of recovering platinum group metals, in particular to a method for recovering platinum group metals such as platinum, palladium and rhodium from waste automobile exhaust catalysts, waste petrochemical hydrogenation catalysts and other platinum group metal secondary resources. technical background

[0002] Platinum group metals are widely used in petrochemical, oil refining and automobile industries due to their unique catalytic ability for automobile exhaust purification, petroleum catalytic hydrogenation, catalytic cracking and other processes. According to statistics, more than 60% of platinum group metals such as platinum, palladium and rhodium are used in the production of catalysts as catalytic active components every year.

[0003] At present, platinum group metal mineral resources are increasingly scarce, resource monopoly is intensifying, coupled with various factors such as low grade of platinum gro...

Examples

Embodiment 1

[0031] Weigh out Al 2 o 3 600g of waste automobile catalyst with a mass fraction of 41.90%, 1005.6g of calcium oxide, 754.2g of silicon dioxide, and 3600g of nickel-type catalyst (the nickel-type collector is high-nickel matte obtained from smelting nickel sulfide ore, and the high-nickel matte is separated by grinding and flotation. After copper and nickel, nickel concentrate containing 75% nickel sulfide and 18% nickel oxide can be obtained), which is crushed to 100 mesh by jaw crusher, mixed evenly, placed in a crucible, and heated to 1400°C in a muffle furnace. And constant temperature 1h. After cooling and separating the slag phase, the contents of platinum, palladium, and rhodium in the metal matte are 0.0382g, 0.6300g, and 0.0703g, respectively. Based on this calculation, the achievable capture rates are 99.48%, 99.53%, and 97.64%, respectively.

[0032] Heat up the metal matte again, and control the temperature to 1210°C for water cooling. Slurry the collected metal...

Embodiment 2

[0034] Weigh out Al 2 o 3600g of waste petrochemical catalyst with a mass fraction of 44.10%, 1587.6g of calcium oxide, 1323.0g of silicon dioxide, and 5400g of nickel-type catalyst (nickel-type collector is high-nickel matte obtained from nickel sulfide ore smelting, in which the high-nickel matte is milled and floated After separating copper and nickel, nickel concentrate containing 85% nickel sulfide and 11% nickel oxide can be obtained), which is crushed to 60 mesh by jaw crusher, mixed evenly, placed in a crucible, and heated to 1450°C in a muffle furnace , and keep the temperature for 1h. After cooling and separating the slag phase, the contents of platinum, palladium, and rhodium in the metal matte are 0.1149g, 0.1253g, and 0.0561g, respectively. Based on this calculation, the achievable capture rates are 99.22%, 99.44%, and 96.39%, respectively.

[0035] Heat up the metal matte again, and control the temperature to 1250°C for water cooling. Slurry the collected meta...

technical field

[0001] The invention belongs to the technical field of recovering platinum group metals, in particular to a method for recovering platinum group metals such as platinum, palladium and rhodium from waste automobile exhaust catalysts, waste petrochemical hydrogenation catalysts and other platinum group metal secondary resources. technical background

[0002] Platinum group metals are widely used in petrochemical, oil refining and automobile industries due to their unique catalytic ability for automobile exhaust purification, petroleum catalytic hydrogenation, catalytic cracking and other processes. According to statistics, more than 60% of platinum group metals such as platinum, palladium and rhodium are used in the production of catalysts as catalytic active components every year.

[0003] At present, platinum group metal mineral resources are increasingly scarce, resource monopoly is intensifying, coupled with various factors such as low grade of platinum gro...

Examples

Embodiment 1

[0031] Weigh out Al 2 o 3 600g of waste automobile catalyst with a mass fraction of 41.90%, 1005.6g of calcium oxide, 754.2g of silicon dioxide, and 3600g of nickel-type catalyst (the nickel-type collector is high-nickel matte obtained from smelting nickel sulfide ore, and the high-nickel matte is separated by grinding and flotation. After copper and nickel, nickel concentrate containing 75% nickel sulfide and 18% nickel oxide can be obtained), which is crushed to 100 mesh by jaw crusher, mixed evenly, placed in a crucible, and heated to 1400°C in a muffle furnace. And constant temperature 1h. After cooling and separating the slag phase, the contents of platinum, palladium, and rhodium in the metal matte are 0.0382g, 0.6300g, and 0.0703g, respectively. Based on this calculation, the achievable capture rates are 99.48%, 99.53%, and 97.64%, respectively.

[0032] Heat up the metal matte again, and control the temperature to 1210°C for water cooling. Slurry the collected metal...

Embodiment 2

[0034] Weigh out Al 2 o 3600g of waste petrochemical catalyst with a mass fraction of 44.10%, 1587.6g of calcium oxide, 1323.0g of silicon dioxide, and 5400g of nickel-type catalyst (nickel-type collector is high-nickel matte obtained from nickel sulfide ore smelting, in which the high-nickel matte is milled and floated After separating copper and nickel, nickel concentrate containing 85% nickel sulfide and 11% nickel oxide can be obtained), which is crushed to 60 mesh by jaw crusher, mixed evenly, placed in a crucible, and heated to 1450°C in a muffle furnace , and keep the temperature for 1h. After cooling and separating the slag phase, the contents of platinum, palladium, and rhodium in the metal matte are 0.1149g, 0.1253g, and 0.0561g, respectively. Based on this calculation, the achievable capture rates are 99.22%, 99.44%, and 96.39%, respectively.

[0035] Heat up the metal matte again, and control the temperature to 1250°C for water cooling. Slurry the collected meta...

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