Rare earths are a valuable set of 17 elements needed to make
Rare earths are a valuable set of 17 elements needed to make everything from smartphones and electric vehicles to fluorescent bulbs and lasers. With global demand skyrocketing and China having a near-monopoly on rare earth production — the United States has only one active mine — there’s a lot of interest in finding alternative sources, such as ramping up recycling.
Pulling rare earths from coal waste offers a two-for-one deal: By retrieving the metals, you also help clean up the pollution.
It is not just children's patent to make creative products with various foods. Brazilian artist William Cass created a series of fruit mini dramas with his wonderful imagination.
Here, vegetables, ice cream, seeds, fruits and other foods have staged performances under the command of William Kass, and lovely children have introduced us to wonderful worlds. The orange juice here turns into a sparkling swimming pool, the stacked pitaya becomes a steep climbing wall, and the strawberry jungle becomes a romantic world. how? Are you looking forward to it! Then let me have a look with the top facial expression!
Long after a coal mine closes, it can leave a dirty legacy. When some of the rock left over from mining is exposed to air and water, sulfuric acid forms and pulls heavy metals from the rock. This acidic soup can pollute waterways and harm wildlife.
Recovering rare earths from what’s called acid mine drainage won’t single-handedly satisfy rising demand for the metals, acknowledges Paul Ziemkiewicz, director of the West Virginia Water Research Institute in Morgantown. But he points to several benefits.
Unlike ore dug from typical rare earth mines, the drainage is rich with the most-needed rare earth elements. Plus, extraction from acid mine drainage also doesn’t generate the radioactive waste that’s typically a by-product of rare earth mines, which often contain uranium and thorium alongside the rare earths. And from a practical standpoint, existing facilities to treat acid mine drainage could be used to collect the rare earths for processing. “Theoretically, you could start producing tomorrow,” Ziemkiewicz says.
From a few hundred sites already treating acid mine drainage, nearly 600 metric tons of rare earth elements and cobalt — another in-demand metal — could be produced annually, Ziemkiewicz and colleagues estimate.
Currently, a pilot project in West Virginia is taking material recovered from an acid mine drainage treatment site and extracting and concentrating the rare earths.
If such a scheme proves feasible, Ziemkiewicz envisions a future in which cleanup sites send their rare earth hauls to a central facility to be processed, and the elements separated. Economic analyses suggest this wouldn’t be a get-rich scheme. But, he says, it could be enough to cover the costs of treating the acid mine drainage.
- 2019-02-21Scientists already knew that some microscopic organisms
- 2019-02-21A female giraffe has a great Valentine’s Day gift for potential mates: urine.
- 2023-01-26Super strong artificial silk? That’s so metal.
- 2021-03-04The whole house is clean, and Si Bichi calls AI to sweep the floor ＂monk＂
- 2023-01-28FDA advisory panel declines to support a controversial Alzheimer’s treatment