A Rock Bottom Coal Cleaning Process
Alot of what makes coal dirty isn't coal at all, but the rock mixed in with it. The rock contains sulfur, a factor in acid rain, as well as toxic heavy metals such as lead. To rid coal of rock, miners often dump it into a slurry of water and an iron ore called magnetite. The clean chunks float on the slurry, while the rock-laden ones sink. So as not to waste the chunks that sink, they're broken into pieces, and the process is repeated. But if the pieces get too tiny, they all sink.
To continue reading this article you must be a Bloomberg Professional Service Subscriber.
If you believe that you may have received this message in error please let us know.
- Stocks Slide From Records as Anxiety Bubbles Up: Markets Wrap
- Smartphones Are Killing Americans, But Nobody’s Counting
- Turns Out It Will Be Congress’s Fault When Stocks Crash
- Why a Pub in the Middle of Nowhere Was Named the World’s Best Restaurant
- Facebook and Google Helped Anti-Refugee Campaign in Swing States