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Method of recovering platinum group metals based on copper capture

A technology of platinum group metals and collectors, which is applied in the field of recovery of platinum group metals, can solve the problems of low recovery rate of platinum group metals, high technical requirements, and environmental pollution by waste liquid, and achieve low reaction conditions and technical requirements, and process flow Simple, high recovery effect

Inactive Publication Date: 2015-10-21
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet process generally dissolves platinum group metals and then recovers them through subsequent refining. The recovery rate of platinum group metals is low, and a large amount of waste liquid is generated, which seriously pollutes the environment.
In the fire process, the technology of plasma smelting iron capture and electric furnace smelting copper capture and recovery of platinum group metals is widely used abroad, but it requires high technical requirements

Method used

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  • Method of recovering platinum group metals based on copper capture

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1, see attached figure 1 , the 200g spent auto catalyst (wherein SiO 2 About 40%, Al 2 o 3 About 35%, about 8% MgO, Pt 357.49g / t, Pd 963.77g / t, Rh 192.90g / t) mixed with 100g copper oxide, 20g lime, 2g carboxymethyl cellulose, finely ground, added water to make pellets , dried, placed in a crucible and added coal powder, and reduced in a reduction furnace at a reduction temperature of 600°C for 10 hours. After the reduction product was crushed and finely ground, the shaker was used for gravity separation to obtain platinum, palladium, and The metal copper powder of rhodium, the recoveries of Pt, Pd and Rh are respectively 99.3%, 99.3% and 99.2%, and the total amount of Pt, Pd and Rh in the tailings is less than 20g / t.

Embodiment 2

[0015] Embodiment 2, see attached figure 1 , the 200g spent petrochemical catalyst (in Al 2 o 3 As a carrier, Pt 0.37%) mixed with 100g copper oxide, 20g lime, 40g quartz sand, 10g borax, and 2g carboxymethyl cellulose were finely ground, added water to make pellets, dried, placed in a crucible and added coal powder, Reduction is carried out in a reduction furnace at a reduction temperature of 600°C for 8 hours. After the reduction product is crushed and finely ground, gravity separation is carried out on a shaking table to obtain platinum-containing metal copper powder. The recovery rate of Pt is 99.5%. The Pt content in the medium is less than 15g / t.

Embodiment 3

[0016] Embodiment 3, see attached figure 1 , the 200g spent auto catalyst (wherein SiO 2 About 40%, Al 2 o 3 About 35%, MgO8%, Pt 199.6g / t, Pd 2037.8g / t, Rh 215.9g / t) mixed with 100g copper oxide, 20g lime, 10g borax, 20g quartz sand, 2g carboxymethyl cellulose Grinding, adding water to make pellets, drying, adding coal powder into a crucible, and reducing in a reduction furnace at a reduction temperature of 700°C for 8 hours. After the reduction product is broken and finely ground, gravity separation is carried out on a shaking table , obtain metal copper powder containing platinum, palladium and rhodium, the recoveries of Pt, Pd and Rh are all 99.2%, and the total amount of Pt, Pd and Rh in tailings is less than 20g / t.

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Abstract

The invention discloses a method of recovering platinum group metals based on copper capture. The method comprises the steps that platinum group metal contained waste is proportionally mixed with a copper capturing agent, an additive and a binding agent, and is subjected to fine grinding and then water adding to be pelletized, dried, placed in a crucible, and reduced at a certain temperature after certain reducing coal is added; metallized pellets obtained by reduction are broken, and the broken metalized pellets are subjected to ball milling and then gravity separation; and obtained ore concentrate is metal copper powder containing the platinum group metals, thereby realizing the recovery of the platinum group metals. The method is simple in technological process; and the reduction temperature is low; used equipment is conventional metallurgy and ore-dressing equipment, so that the method is easy to implement; a recovery rate of the platinum group metals is greater than 99%; the content of the platinum group metals in gravitation separation tailings is less than 10g / t; with the adoption of the method, the platinum group metals can be effectively recovered from spent auto-catalysts, catalysts for petrochemical industry and catalysts for fine chemicals; no harmful gas is discharged; the tailings can serve as raw building materials; and the whole process is clean and pollution-free.

Description

technical field [0001] The invention relates to a method for recovering platinum group metals based on copper capture, in particular to a method for recovering platinum group metals from exhausted automobile exhaust catalysts, petrochemical catalysts, fine chemical catalysts and other waste materials containing platinum group metals based on copper capture. Background technique [0002] my country's platinum group metal mineral resources are very poor, and the prospective reserves are less than 400 tons. my country's annual output of platinum group metal mineral resources from platinum group metal mineral resources is only about 3 tons. At present, my country is in a period of rapid economic development, and the consumption of platinum group metals is increasing year by year. It has become the largest consumer of platinum group metals in the world. The annual demand for platinum group metals in my country has reached more than 140 tons. Relying on mineral resources is far fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCY02P10/20
Inventor 董海刚陈家林赵家春保思敏吴跃东李博捷杨海琼童伟锋王亚雄吴晓峰
Owner KUNMING INST OF PRECIOUS METALS
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