Method for extracting precious metal from auto-exhaust catalyst by hydrometallurgy and pyrometallurgy complex process

A precious metal and catalyst technology, which is applied in the field of effective recovery of platinum group metals, can solve the problem of low recovery rate of precious metals, and achieve the effect of good environmental friendliness, easy realization, and high recovery rate of precious metals

Inactive Publication Date: 2009-09-02
KUNMING INST OF PRECIOUS METALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet-fire combined method makes up for the defect of low recovery rate of precious metals caused by the simple use of wet treatment of exhausted automobile exhaust catalysts, making it have more efficient recovery rate of precious metals, more relaxed operating conditions, and easy industrial realization than the existing process

Method used

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  • Method for extracting precious metal from auto-exhaust catalyst by hydrometallurgy and pyrometallurgy complex process
  • Method for extracting precious metal from auto-exhaust catalyst by hydrometallurgy and pyrometallurgy complex process
  • Method for extracting precious metal from auto-exhaust catalyst by hydrometallurgy and pyrometallurgy complex process

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] 1. Leaching

[0022] The exhausted automobile catalyst is first crushed and powdered, and 200g is taken each time and added to the hydrochloric acid solution, the temperature is raised to about 80°C, chlorine gas is introduced, stirred and leached, filtered,

[0023] The leaching results are as follows:

[0024]

[0025] 2. Replacement

[0026] Put the leaching solution in a beaker, first add iron powder for replacement, then add zinc powder for replacement, precipitate the precious metal in it, and obtain precious metal concentrate. The replacement results are as follows:

[0027]

[0028] 3. Melting

[0029] Take the leaching residue of the exhausted automobile catalyst, add the trapping agent, slagging agent and reducing agent, mix it evenly with a mixer, put it into a clay graphite crucible, place it in a high temperature resistance furnace, keep the temperature at 1400°C for 0.5 hours, and the melting is completed Then take it out, cool to room temperature...

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Abstract

The invention relates to a method for extracting precious metal from a disabled auto-exhaust catalyst, which comprises the following steps: 1. lixiviating precious metal from the disabled auto-exhaust catalyst by a hydrometallurgy process and obtaining precious metal concentrates after permuting lixivium; 2. lixiviating slag, collecting precious metal of the slag by a pyrometallurgy process to obtain a precious metal phase and selectively lixiviating base metal in the precious metal phase to obtain precious metal concentrates; and 3 combining the precious metal concentrates obtained in the first two steps and refining the precious metal concentrates to produce platinum, palladium and rhodium products. The invention compensates the deficiency that the percent recovery of the precious metal is low by simply treating the disabled auto-exhaust catalyst with the hydrometallurgy process and has the advantages that the contents of platinum, palladium and rhodium in the waste slag are smaller than 1g/t and the product purity reaches 99.95 percent.

Description

technical field [0001] The invention relates to a method for recovering platinum group metals from automobile exhaust catalysts, in particular to a method for effectively recovering platinum group metals from automobile exhaust catalysts containing precious metals or various low-grade materials. Background technique [0002] The domestic automobile industry began to use precious metal exhaust catalysts in 2000, and the installed volume in 2000 was about 200,000 vehicles. In 2005, the output of light vehicles in my country reached 5.2 million, and in 2006 it reached 7 million. The development speed has doubled. Since 2006, domestic automobiles have been required to install purification catalysts. According to statistics, from 2005 to 2006, the amount of platinum group metals used in automobile catalysts in my country reached 20-30 tons. In 2007, my country's automobile output exceeded 10 million. In the future, automobile production and sales will continue to grow, and the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 吴晓峰汪云华童伟锋赵家春范兴祥昝林寒李柏榆李楠
Owner KUNMING INST OF PRECIOUS METALS
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