Slashdot Mirror
China and Japan Covet the Same Rare-Earth Metals
An anonymous reader writes with this excerpt from The Australian: "Japan's increasingly frantic efforts to lead the world in green technology have put it on a collision course with the ambitions of China and dragged both government and industry into the murky realm of large-scale mineral smuggling."
Lithium (presumably for lithium-ion electric car batteries) is not a rare-earth metal. http://en.wikipedia.org/wiki/Rare_earth_element
Which element(s) are we fussing about? Why are they useful for green tech?
Lanthanum: very useful for green tech. Hydrogen fuel cell-related.
Hydrogen sponge alloys can contain lanthanum. These alloys are capable of storing up to 400 times their own volume of hydrogen gas in a reversible adsorption process. Heat energy is released
Cerium: maybe useful for green tech. Maybe motor magnets.
Cerium is used in alloys that are used to make permanent magnets.
Praseodymium: maybe marginally useful for green tech. Lightweight cars.
As an alloying agent with magnesium to create high-strength metals that are used in aircraft engines
Neodymium: very useful for green tech. Strong motor magnets.
Neodymium magnets are the strongest permanent magnets known.
Promethium: probably not useful for green tech.
Light sources.
Samarium: probably not useful for green tech.
Headphone magnets.
Alloys.
Europium: probably not useful for green tech.
Red color in CRTs.
Gadolinium: probably not useful for green tech.
Garnets.
CDs.
MRIs.
Terbium: marginally useful for green tech.
Solid state devices.
Alloys that respond strongly to a magnetic field. Sensor, actuator applications.
"Green" phosphors. Ha.
Dysprosium: very useful for green tech. Strong motor magnets.
* Neodymium-iron-boron magnets can have up to 6% of the neodymium substituted with dysprosium[15] to raise the coercivity for demanding applications such as drive motors for hybrid electric vehicles.
* This substitution would require up to 100 grams of dysprosium per hybrid car produced.
* Based on Toyota's projected 2 million units per year, the use of dysprosium in applications such as this would quickly exhaust the available supply of the metal. The dysprosium substitution may also be useful in other applications, as it improves the corrosion resistance of the magnets
* Currently, most dysprosium is being obtained from the ion-adsorption clay ores of southern China.
Holium: maybe useful for green tech.
Very strong magnets.
Cubic zirconia.
Lasers.
Erbium: useful for green tech, but probably not in the article's context, which was automotive.
Nuclear control rods.
Cubic zirconia.
Lasers.
Cryocoolers.
Thulium: scarce; probably not useful for green tech.
Superconductors.
Microwave equipment.
X-ray devices, in a nuclear reactor.
Ytterbium: useful for green tech, but probably not in the article's context, which was automotive.
Convert infrared light to electricity in solar cells.
X-ray source. Steel dopant.
Optics, lasers.
Lutetium: scarce; useful for green tech, but probably not in the article's context, which was automotive.
Catalyst in process of making OLEDs (organic light-emitting diodes).
It turns out China (and to some extend Australia) are rich in these ores that contain lanthanum, neodymium, terbium, and dysprosium:
* http://en.wikipedia.org/wiki/Bastnasite
* http://en.wikipedia.org/wiki/Monazite
Other ores:
* http://en.wikipedia.org/wiki/Xenotime
* http://en.wikipedia.org/wiki/Fergusonite
* http://en.wikipedia.org/wiki/Gadolinite
* http://en.wikipedia.org/wiki/Euxenite
* http://en.wikipedia.org/wiki/Polycrase
* http://en.wikipedia.org/wiki/Blomstrandine
The Australian News article is probably worrying over China controlling bastnasite and monazite, which notably have neodymium and dysprosium, which are used for magnets, which go in motors, which go in electric cars, which is a green tech. A car is pictured in the article.
Working the lanthanum angle wrt fuel cells seems less likely.
Also, an AC on /. that read Wikipedia is not a reliable source :)