वास्तव में क्या चल रहा है
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.
- सामग्री
- Dysprosium
- प्रकार
- Ion-adsorption clay, very low grade, unusually rich in heavy rare earths
- यह कहाँ से शुरू होती है
- China — Weathered granite hills in Jiangxi, Guangdong and Fujian
चरण दर चरण, और सीमा दर सीमा
China · Jiangxi and Guangdong द्वारा धारित State-consolidated producers (राज्य उत्पादक)
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.
शेष का क्या हुआ: Older, uncontrolled in-situ leaching left serious groundwater and slope-stability damage, which is much of why the industry was consolidated under state control.
यहाँ क्यों: 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 द्वारा धारित Producers (रासायनिक)
Precipitating a mixed carbonate
The pregnant solution is precipitated into a mixed rare-earth carbonate — the intermediate everything downstream starts from.
यहाँ क्यों: Concentrating before transport, as always.
China · Ganzhou, Jiangxi द्वारा धारित China Rare Earth Group and affiliates (शोधनकर्ता)
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.
शेष का क्या हुआ: 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.
यहाँ क्यों: Heavy separation capacity is concentrated here to a degree unmatched by any other material in this atlas.
China · Magnet plants द्वारा धारित Magnet manufacturers (निर्माता)
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.
शेष का क्या हुआ: This is substitution by engineering rather than by chemistry — same performance, a fraction of the scarce element.
यहाँ क्यों: Grain-boundary diffusion is a process advantage held by a small number of manufacturers.
Germany · Traction motors and turbines द्वारा धारित Motor manufacturers (निर्माता)
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.
यहाँ क्यों: A few kilograms of a metal from a Chinese hillside is what lets an electric motor survive a summer traffic jam.
यह एक कार्यसाधित उदाहरण है। यह एक घोषित आरंभिक मात्रा को प्रकाशित सामान्य उपज और पुनःप्राप्ति दरों के माध्यम से अनुसरण करता है, इसलिए अनुपात जाँचे जा सकते हैं; यह किसी विशिष्ट शिपमेंट का अभिलेख नहीं है। मार्ग संबंधी तथ्य — कौन-से देश, कौन-सी प्रक्रियाएँ, और क्यों सामग्री को कहीं और संभाला नहीं जा सकता — सार्वजनिक रिपोर्टिंग से संकलित हैं।