Qué es lo que se mueve realmente
Heavy rare earths do not come from a conventional orebody. They come from weathered granite where the metal ions cling loosely to clay, and they are recovered by washing a salt solution through the hillside. The grade is tiny; the strategic weight is enormous.
- El material
- Dysprosium
- La variedad
- Ion-adsorption clay, very low grade, unusually rich in heavy rare earths
- Dónde empieza
- China — Weathered granite hills in Jiangxi, Guangdong and Fujian
Paso a paso, y frontera por frontera
China · Jiangxi and Guangdong en poder de State-consolidated producers (Productor estatal)
Leaching the hill in place
Ammonium sulfate solution is injected into the weathered granite and collected downslope. The rare-earth ions swap places with ammonium on the clay and come out in solution. Nothing is blasted and, in modern practice, little is dug.
Qué ocurrió con el resto: Older, uncontrolled in-situ leaching left serious groundwater and slope-stability damage, which is much of why the industry was consolidated under state control.
Por qué aquí: This deposit type needs a specific granite, a specific climate and millions of years. It is not a matter of looking harder elsewhere.
China · On site en poder de Producers (Químico)
Precipitating a mixed carbonate
The pregnant solution is precipitated into a mixed rare-earth carbonate — the intermediate everything downstream starts from.
Por qué aquí: Concentrating before transport, as always.
China · Ganzhou, Jiangxi en poder de China Rare Earth Group and affiliates (Refinador)
Separating the heavies
Solvent extraction, but far harder than for the light rare earths: dysprosium, terbium, holmium and erbium are even more alike than neodymium and praseodymium, so it takes more stages and more patience.
Qué ocurrió con el resto: Terbium, yttrium, gadolinium and the rest come out alongside. Yttrium is by far the largest fraction; dysprosium and terbium are the ones everyone actually wants.
Por qué aquí: Heavy separation capacity is concentrated here to a degree unmatched by any other material in this atlas.
China · Magnet plants en poder de Magnet manufacturers (Fabricante)
Diffused into a magnet's grain boundaries
Rather than alloying dysprosium throughout the magnet, it is painted on and diffused into the grain boundaries where it does the most good. The technique cut dysprosium use per magnet several-fold.
Qué ocurrió con el resto: This is substitution by engineering rather than by chemistry — same performance, a fraction of the scarce element.
Por qué aquí: Grain-boundary diffusion is a process advantage held by a small number of manufacturers.
Germany · Traction motors and turbines en poder de Motor manufacturers (Fabricante)
A motor that can get hot
Without dysprosium a neodymium magnet begins losing strength around 80 °C. A traction motor or a turbine nacelle routinely runs hotter than that. 15 kg is enough for several thousand car motors.
Por qué aquí: A few kilograms of a metal from a Chinese hillside is what lets an electric motor survive a summer traffic jam.
Este es un ejemplo resuelto. Sigue una cantidad de partida declarada a través de rendimientos y recuperaciones típicos publicados, por lo que las proporciones son verificables; no es el registro de un envío concreto. Los datos de la ruta — qué países, qué procesos y por qué el material no puede simplemente manipularse en otro lugar — se han compilado a partir de información pública.