By Ingeborg Hinz, Karl Koeber, Irmingard Kreuzbichler, Peter Kuhn, Arnulf Seidel (auth.), Ingeborg Hinz, Hans Karl Kugler, Joachim Wagner (eds.)
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Extra info for Be Beryllium: Supplement Volume A1 The Element. Production, Atom, Molecules, Chemical Behavior, Toxicology
Example text
Mineral. A. 85 [1976] No. 180611). [4] W. A. Mod, C. W. Becker, Dow ChemicaL Co. S. A. 62 [1965] 15818). [5] J. K. Grunig, W. B. Davis, W. C. S. A. 77 [1972] No. 166770; Ger. A. 72 [1970] No. 23740). [6] P. H. Johnson, H. E. S. A. 65 [1966] 11856). [7] W. J. Biermann, BeryLoy, Ltd. S. A. 66 [1967] No. 58128; Can. A. 68 [1968] No. 23836). [8] M. DeLcorte, A. Lecocq, 0. StuLzaft (Fr. A. 65 [1966]10200). [9] L. Crocker, R. 0. Dannenberg, D. W. S. Bur.
Brit. A. 64 [1966]17114). [18] Beryllium MetaLs & ChemicaLs Corp. (Fr. A. 62 [1965]11466). [19] D. Gardner (Brit. 482531 [1936/38]1/3; C. 193811 764). 96% BeQ) were peLLeted with carbon in a 10:4 weight ratio and dried at 110°C. 5%, respectiveLy, of the BeQ content into soLubLe BeF 2 which was extracted by hot water. Precipitation with ammonium hydroxide and ignition to the oxides gave a product which contained 62 to 70% BeO with Fe, AL, and Si as the major impurities, May, Hoatson [1]. Treatment of the crude beryL ore with gaseous HF at 400 to 600°C produced soLubLe BeF 2 and voLatiLe SiF 4 Leaving insoLubLe CaF 2 , AL 20 3 , and Fe 20 3 .
For earlier batch tests under similar conditions, see Havens et at. [7]. For batch tests employing NaF, (NaP0 3 )6' Na 4 P2 0 7 , and borax as depressing agents, see Havens [8]. Fine particles «5 and <44I-lm) of phenacite are much less readily floated by oleic acid than larger ones because they require a longer treatment by the collector as a consequence of their large absorption capacity [9]. IR studies of colloidal suspensions of a phenacite mineral «250 I-lm) conditioned with oleic acid show that phenacite reacts with oleic acid to form a chemisorbed oleate monolayer on its surface which is associated with a displacement of the OH - and silicate anions from the mineral surface.