Can Centrifuging Nuclear Waste Recover Rare Earth Elements?

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In summary, the conversation discusses the potential for recovering rare Earth elements, particularly rhodium, from stockpiles of nuclear waste. While there may be some economic feasibility for extracting valuable materials like Ru-106, the high level of radioactivity in the waste makes it difficult to extract pure samples of rhodium. Chemical extraction methods may be more practical, but the amount of rhodium present in the waste is still unclear. Overall, the potential for extracting rhodium from nuclear waste remains uncertain.
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My first question on this forum, and I'm diving in head first. While working on a project that has very little to do with physics, I stumbled upon a list of products that result from a Uranium-235 fission reaction. To my surprise, there is a lot of good stuff in that nuclear waste. Specifically, I am interested in rhodium.

Considering that we have stockpiles of nuclear waste that are decades old, is there some reason that no one is centrifuging to recover rare Earth elements? I fully understand that the waste is still radioactive, but the stuff I want is safer than tap water after 50 years of half-lives. Am I missing something here?
 
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clunker said:
Considering that we have stockpiles of nuclear waste that are decades old, is there some reason that no one is centrifuging to recover rare Earth elements?

An offhand guess would be that there's simply not that much of it, and the fact that it's in a highly radioactive environment makes it economically prohibitive to recover.
 
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They do extract valuable materials from nuclear waste - usually radioisotopes like Ru-106. They are much (~100x) more valuable than, e.g. Rhodium, which is ~$20/g.
 
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In the rare cases where there is no long-living isotope of an element (as in Rhodium) it is possible, but chemical separation methods are much easier than centrifugation. You have to get a very pure sample, otherwise it is too radioactive for most applications. There has been some work to extract rhodium, but making it commercially interesting is difficult. Wikipedia has a description.
 
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Thanks for the responses everyone. I just looked at the price of Rhodium as a commodity, and it is somewhere around $2,750 per ounce ($97/g). Maybe not as valuable as Ru-106, but still prohibitively expensive for a lot of applications. My latest project (only in the planning stages) requires enough rhodium that the automotive industry would never adopt it. They won't even use all-metal catalytic converters despite their gains in efficiency and longevity. If manufacturers ever did apply my idea, the value of Rh would skyrocket due to lack of supply. According to Wikipedia, Rh accounts for about 3.6% of U-235 fission products, which sounds like a lot to me. However, the article does not specify how much is Rh-103 and how much is Rh-105.

That Wikipedia page is exactly what got me started down this rabbit hole. I was thinking of centrifuging because Rh for automotive use would not need to be very pure. Some contamination with Ru-102 and Ru-104 would not be a problem since ruthenium has similar properties. Ru-103 is the only radio isotope you would need to worry about, and it decays into the the desired product. Maybe chemical extraction is easier. I haven't looked into it that far.
 
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You'll have to calculate a bit to get fission yield numbers from it, but the study cited there quotes >400 g/ton for rhodium, and as far as I understand they exclude Rh-105 as they look at long-living products only. Reference 1 might have better numbers.
 

FAQ: Can Centrifuging Nuclear Waste Recover Rare Earth Elements?

1. What is centrifuging nuclear waste?

Centrifuging nuclear waste is a process used to separate different components of nuclear waste based on their density using a centrifuge machine. This allows for the removal of radioactive materials from the waste, making it safer for disposal.

2. How does centrifuging work?

In centrifuging, the nuclear waste is placed in a rotating container and spun at high speeds. This causes the denser materials, such as radioactive particles, to move towards the outside of the container while the less dense materials, such as water, stay towards the center. The separated materials can then be collected and disposed of separately.

3. What types of nuclear waste can be centrifuged?

Centrifuging can be used to separate various types of nuclear waste, including liquid waste, sludge waste, and solid waste. However, the process may differ slightly depending on the type of waste being treated.

4. Is centrifuging nuclear waste safe?

Centrifuging nuclear waste is a safe and effective method for treating and disposing of nuclear waste. The process is carefully controlled and monitored to ensure the safety of workers and the environment. Additionally, the separated waste materials are handled and disposed of according to strict regulations to prevent any potential harm.

5. How does centrifuging nuclear waste benefit the environment?

Centrifuging nuclear waste helps to reduce the amount of radioactive materials in the waste, making it safer for disposal. This in turn reduces the potential for environmental contamination and protects ecosystems and human health. Additionally, by separating and treating the waste, it can also potentially be recycled or reused, further reducing its impact on the environment.

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