It was first developed in the United States, but the United States discarded it in the 1960s.
The most important rare earth element is dysprosium.
If you purify 1 ton of this dysprosium, what comes out is 75 tons of acidic wastewater.
1 ton of radioactive waste
A large amount of waste gas is produced.
Most of the radioactive waste consists of thorium.
This is a win-win situation for China, which produces rare earth elements.
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