Method for recycling platinum group metal from waste catalysts
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A technology for platinum group metals and waste catalysts, which is used in the field of platinum group metal recovery and platinum group metal recovery.
Inactive Publication Date: 2016-03-16
JINCHUAN GROUP LIMITED
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[0011] The technical problem to be solved by the present invention is to provide a nickel-type catalyst with good affinity with platinum group metals and low smelting temperature in view of the various shortcomings of the existing pyrotechnic and wet methods for recovering platinum grou
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[0030] Example 1
[0031] Weigh Al 2 O 3 The mass fraction of 41.90% waste automobile catalyst 600g, calcium oxide 1005.6g, silica 754.2g, nickel-type catalyst 3600g (nickel-type collector is the high nickel matte obtained from the smelting of nickel sulfide ore, and the high nickel matte is separated by grinding and floating After copper and nickel, nickel concentrate containing 75% nickel sulfide and 18% nickel oxide can be obtained), which is crushed to 100 mesh with a jaw crusher and mixed uniformly, placed in a crucible, and heated to 1400°C in a muffle furnace. And keep constant temperature for 1h. After cooling and separating the slag phase, the contents of platinum, palladium, and rhodium in the metal matte were 0.0382g, 0.6300g, and 0.0703g, respectively, and the achievable capture rates calculated by this calculation were 99.48%, 99.53%, and 97.64%, respectively.
[0032] The metal matte is heated up again, and the temperature is controlled to 1210°C for water cooling. ...
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[0033] Example 2
[0034] Weigh Al 2 O 3 The mass fraction of 44.10% waste petrochemical catalyst 600g, calcium oxide 1587.6g, silica 1323.0g, nickel-type catalyst 5400g (nickel-type collector is the high nickel matte obtained from the smelting of nickel sulfide ore, of which the high nickel matte is ground and floated After separating the copper and nickel, a nickel concentrate containing 85% nickel sulfide and 11% nickel oxide can be obtained), which is crushed to 60 meshes by a jaw crusher and mixed uniformly, placed in a crucible, and heated to 1450℃ in a muffle furnace , And keep constant temperature for 1h. After cooling and separating the slag phase, the contents of platinum, palladium, and rhodium in the metal matte were 0.1149g, 0.1253g, and 0.0561g, respectively, and the achievable capture rates calculated by this calculation were 99.22%, 99.44%, and 96.39%, respectively.
[0035] The metal matte is heated up again, and the temperature is controlled to 1250°C for water c...
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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...
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