The three Bokan Mountain samples assayed 1,700 to 20,000 ppm U ( to % U 3 O 8) and averaged % light rare earth oxides, % heavy rare earth oxides, and % yttrium oxide (total of % rare earth oxides). Mineralogical testing identified coffinite and uranoan thorite as the dominant uraniumbearing minerals, and tombarthite, limoriite, synchisite, and bastnaesite as the dominant REEbearing .
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稀土(rare earth),曾称稀土金属,或称稀土元素,是元素周期表第Ⅲ族副族元素钪、钇和镧系元素共17种化学元素的合称。稀土因其天然丰度小,又以氧化物或含氧酸盐矿物共生形式存在,故叫"稀土"。 ... rare earth tombarthite
Full text of "Bibliography of the Geology and Mineralogy of the Rare Earths and Scandium to 1971" See other formats ...
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稀土 tombarthite; rare earth 子 son 石 dan,a unit of dry measure fo ... The said tombarthite is one of the kinds such as lanthanum, europium nitrate, erbium nitrate, cerous nitrate and neodymium nitrate.
Apr 07, 2017· Rare earth elements(REE) industrial technology, smelting . In addition to the occurrence of the rare earth elements in nature in a variety of rare earth mines, a considerable proportion of REE come from the symbiosis with apatite and phosphate rock ores.
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