Ushirikiano
SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Hatari
Gadolinium: Mixed Rare-Earth Chlorides Reduced with Calcium in Tantalum, Samarium Left in the Slag (Spedding and Daane, US 2,714,554)
Gadolinium is hard to free from samarium and europium by chemistry. Spedding and Daane turned the mixed oxides into chlorides and heated them with calcium in a tantalum crucible: only the gadolinium chloride is reduced, so the metal pools at the bottom and the samarium and europium wash away with the slag.
Result: gadolinium metal with no detectable samarium (Example I: 21.5 g from 40 g of chlorides).
Source: F. H. Spedding and A. H. Daane, US 2,714,554 (1955). Hydrogen chloride gas and strong hydrochloric acid are corrosive; hot work at 1500 °C under argon; calcium reacts with water. Picture drawn by Youblob.
Juu
2 days
Maudhui hatari
Blueprint hii ina taratibu za hatari. Ingia na uwashe maudhui ya hatari katika mipangilio ya akaunti yako ili kuona maagizo ya hatua kwa hatua.
IngiaMchoro huu unatengeneza
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.