Welcome to your first post by the way.Is there a method to extract Sc or Sc2O3 from AlSc alloys?
Scandium is useful in 0.2%-0.3% concentration in aluminum. They are similar chemically. To control the ratio, special solvents extraction is used on the sulfate solution, then precipitation of sodium scandium flouride, which is added to aluminum oxide electrolysisIs there a method to extract Sc or Sc2O3 from AlSc alloys?
Recovery of scandiumThanks.
There are much higher concentrations (5-30% atomic Sc in AlSc alloys) used in the thin film industry for piezoelectric applications. The issue is recovering the Sc post alloy in excess material from manufacturing and "spent" sputtering targets, or having an alternate outlet for that material.
PppScandium is useful in 0.2%-0.3% concentration in aluminum. They are similar chemically. To control the ratio, special solvents extraction is used on the sulfate solution, then precipitation of sodium scandium flouride, which is added to aluminum oxide electrolysis
So this is your first contribution to the forum?
Yes, that is usually the case. However, recovering Sc, actually just obtaining a stable in spec. supply of high purity distilled Sc metal is challenging (Russia or China); let alone developing the chemistry to recover it. Manufacturers aren't necessarily refining experts, and this is a relatively new alloy to the industry. Recycling in spec. material can be done by using it as remelt material. But, out of spec material (high oxygen, off-comp), etc. requires refining. In the < 20% Sc alloys there is also a segregation issue during cooling. See phase diagram. So you may have material where the sweet spot %-wise of Sc was used, and the remainder cannot be used due to the gradient of Sc through the material.Don’t they have protocols for recycling their waste?
And reclaiming their expensive raw materials?
The Sc is in the alloy as Al3Sc embedded in Al matrix in the majority of the alloys. Considering that is the above still viable? Apologies, I'm not a chemist by training.Recovery of scandium
Di-(2-ethylhexyl)phosphoric acid or
D2EHPA, 10% solution in kerosene is used for selective extraction of scandium sulphate solution, then precipitating with NaF as Na3ScCl6
Google for Recovery of scandium from synthetic red mud leach solution by solvent extraction with D2EHPA, Apr 19, 2013. It claims high selectivity for scandium over other metals including aluminum in dilute sulfuric solutionThe Sc is in the alloy as Al3Sc embedded in Al matrix in the majority of the alloys. Considering that is the above still viable? Apologies, I'm not a chemist by training.
In China, they recovery the alloy or waste materials by HCL leaching and solvent extraction and they precipitate by Sc2O3, then it is transfered to ScF3 and reduction by Ca to metallic Sc. now the AlSc targets is very popular in the electronic industry.Is there a method to extract Sc or Sc2O3 from AlSc alloys?
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