alt Hacker NewsThe big problem is purity. Fabs use grade 5 and 6 helium where contaminants are 1-10 parts per billion. The infrastructure to get it that pure becomes very specialized and any time the helium goes through a process it picks up so much contamination that recycling it would require the entire purifying and quality control infrastructure for pressure or temperature swing adsorption.
Some fabs are starting to reuse helium in downstream processes but there’s only so much they can do without expanding their core competency into yet another complex chemical manufacturing process.
MRI machines don’t need high purity helium and the contamination doesn’t “gunk up” all the tools so it’s not an issue to recycle it there.
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> The infrastructure to get it that pure becomes very specialized
I think some of the most advanced fab infrastructure is the ultra pure water system. Water becomes quite aggressive chemically when it has no dissolved ions in it. You have to use exotic or highly processed materials simply to transport it around. If the factory didn't need such massive quantities of it, trucking it in would likely be preferable.
Now I'm imagining a procedural cop show where they bust an illegal helium dealer, and one of the cops takes a huff to gauge what they're dealing with, and then squeaks out "that's the good stuff".