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A method for enriching platinum and co-producing metallic aluminum from spent alumina platinum catalyst

A platinum catalyst, alumina technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal chlorides, etc., can solve the problems of loss of value of carrier aluminum oxide, low content of platinum group metals, etc., and achieve industrial application prospects Broad, high platinum yield, good enrichment effect

Active Publication Date: 2021-11-23
KUNMING BOREN PRECIOUS METALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] For this reason, the present invention provides a kind of method that enriches platinum to co-produce metal aluminum from exhausted aluminum oxide platinum catalyst, to solve the problem that existing exhausted aluminum-based catalyst extracts platinum group metal mainly by wet method, due to the low content of platinum group metal , a large amount of waste residue, waste liquid, etc. are produced during the extraction process, and the carrier aluminum oxide loses its due value

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  • A method for enriching platinum and co-producing metallic aluminum from spent alumina platinum catalyst

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Embodiment 1-7

[0036] Embodiment 1-7 A process flow diagram of a method for enriching platinum and co-producing metallic aluminum from spent alumina platinum catalysts is as follows figure 1 shown.

Embodiment 1

[0038] A method for enriching platinum and co-producing metallic aluminum from spent alumina platinum catalyst, said method comprising the steps of:

[0039] S1. Mix the exhausted alumina platinum catalyst with flux, and place it in an aluminum electrolytic cell for electrolytic reaction. The parameters of the electrolytic reaction are: cell operating voltage 4.2V, electrolysis temperature 980°C, pole distance 5cm, molecular ratio 2.6, alumina content 4%, electrolyte level 23cm, aluminum liquid level 20cm, anode current density 0.62A / cm 2 , the flux is 85% cryolite, 2% aluminum fluoride, and 3% sodium fluoride to obtain crude aluminum and residual electrolyte respectively, and part of the residual electrolyte is returned to the aluminum electrolytic cell for electrolytic reaction;

[0040] S2. Raise the temperature of the crude aluminum to 670°C and stir it mechanically for 2 hours. The platinum-aluminum intermetallic compound is precipitated in a solid state to form an infusi...

Embodiment 2

[0045] A method for enriching platinum and co-producing metallic aluminum from spent alumina platinum catalyst, said method comprising the steps of:

[0046] S1. Mix the exhausted alumina platinum catalyst with flux and place it in an aluminum electrolytic cell for electrolytic reaction. The parameters of the electrolytic reaction are: cell operating voltage 4.2V, electrolysis temperature 960°C, pole distance 4cm, molecular ratio 2.3, alumina content 3%, electrolyte level 21cm, aluminum liquid level 23cm, anode current density 0.65A / cm 2 , the flux is 87% cryolite and 5% aluminum fluoride to obtain crude aluminum and residual electrolyte respectively, and part of the residual electrolyte is returned to the aluminum electrolytic cell for electrolytic reaction;

[0047] S2. Raise the temperature of the crude aluminum to 680°C and use electromagnetic stirring for 1 hour. The platinum-aluminum intermetallic compound is precipitated in a solid state to form an infusible residue, an...

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Abstract

The invention discloses a method for enriching platinum and co-producing metal aluminum from an invalid alumina platinum catalyst, which relates to the technical field of metallurgy of rare and precious metals, and comprises the following steps: electrolytically reacting the exhausted alumina platinum catalyst and a flux to obtain crude aluminum and residual Electrolyte; smelt crude aluminum to obtain metal aluminum and residue; melt residue, part of residual electrolyte and part of crude aluminum together to obtain smelting slag and metal melt; return the smelting slag to the aluminum electrolytic cell, and the metal melt is subjected to water quenching treatment ;React the water quenching product with dilute acid to obtain platinum concentrate and aluminum-containing solution; react the aluminum-containing solution with sodium hydroxide to obtain aluminum hydroxide and sodium salt solution; calcinate aluminum hydroxide to obtain aluminum oxide and return to the aluminum electrolytic cell , the sodium salt solution is concentrated and crystallized to obtain the sodium salt product. The method of the invention realizes the recovery of platinum and aluminum from the spent alumina platinum catalyst, the recovery rates of platinum and aluminum are respectively greater than 98.0% and 92.0%, the enrichment ratio of platinum is greater than 120 times, and the purity of aluminum products is greater than 98.0%.

Description

technical field [0001] The invention relates to the technical field of metallurgy of rare and precious metals, in particular to a method for enriching platinum and co-producing metal aluminum from spent alumina platinum catalysts. Background technique [0002] Currently, methods for enriching or recovering platinum group metals from spent aluminum-based catalyst supports are as follows: [0003] Wang Ming and others introduced the use of sintering-dissolution method to dissolve the alumina matrix in the spent catalyst to enrich platinum and then recover platinum from insoluble slag in "Precious Metals", Volume 32, Issue 4, 2011. The research results show that: the waste catalyst is calcined at 600°C for 1 hour, the carbon residue is 0.54%, and the decarburization rate reaches 92.66%; the slag is prepared according to the molecular ratio of 1.2, sintered at 800°C for 2 hours, and the clinker is dissolved in hot water at 95°C for 10 minutes , One-time sintering-dissolution, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C25C3/06C25C3/18C22B9/02C22B11/00C22B11/02C22B21/00C01D5/00C01D3/04
CPCC01D3/04C01D5/00C22B7/004C22B7/009C22B9/02C22B11/026C22B11/048C22B21/0076C25C3/06C25C3/18Y02P10/20Y02P20/584
Inventor 李琰范兴祥王家和毛莹博吴娜孙红燕
Owner KUNMING BOREN PRECIOUS METALS
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