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Monday, April 06, 2015 10:47:09 PM
"Between mid-1958 and early 1962 the CSM Research Foundation completed 23 reports on acid leaching and chlorination processes designed to extract high purity niobium metal and salts from the Chewett “ores”."
http://www.google.tl/patents/US3240557
This will answer most of my questions.
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