Monday, August 18, 2014 12:17:42 PM
"Confirms the earlier work" -Patrick Chance
"Both processes are demonstrably operable and appear capable of producing high purity niobium metal powder for a total cost of less than $13 / kg at a 1000 tpy (ibid.)" Chance's NI report
PROCESS FOR RECOVERY OF NIOBIUM FROM ORES IN ASSOCIATIONS. WITH ALKALINE EARTH METALS
B. J. LERNER. March 13, 1962
www.google.com/patents/US3025157.pdf
"Dominion Gulf carried out metallurgical testingof material derived from the Chewett
Township deposits. Work appears to have focused on the D Zone completing conventional
(physical liberation and concentration) tests with disappointing results and developing two
hyrdometallurgical [chemical] extraction processes (chlorination and phosgenation) before
halting the project in 1962 (Lerner, 1962). "
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