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[en] An extraction was conducted in 16 stages mixer settler. The scrub solution entered stage 1, the feed at stage of 5 and the solvent at stage 16. At the nitric acid 5N and 2000 rpm as the mixing speed, the recovery of Zircon was 92.02 % and the hafnium content was 42.5 ppm. The feed concentration was 28.97 gram/l and the hafnium content was 1249 ppm
Source
Sudjatmoko; Karmanto, Eko Edy; Endang-Supartini (Yogyakarta Nuclear Research Centre, National Atomic Energy Agency, Yogyakarta (Indonesia)); National Atomic Energy Agency, Yogyakarta Nuclear Research Centre, Yogyakarta (Indonesia); 394 p; ISSN 0216-3128; 
; Apr 1996; p. 115-118; Scientific Meeting and Presentation on Basic Research in Nuclear Science and Technology; Pertemuan dan Presentasi Ilmiah Penelitian Dasar Ilmu Pengetahuan Teknologi Nuklir; Yogyakarta (Indonesia); 23-25 Apr 1996; Also available from Centre for Development of Nuclear Informatics, National Nuclear Energy Agency, Puspiptek Area, Fax. 62-21-7560923, PO BOX 4274, Jakarta (ID); 7 refs; 2 tabs; 1 fig
; Apr 1996; p. 115-118; Scientific Meeting and Presentation on Basic Research in Nuclear Science and Technology; Pertemuan dan Presentasi Ilmiah Penelitian Dasar Ilmu Pengetahuan Teknologi Nuklir; Yogyakarta (Indonesia); 23-25 Apr 1996; Also available from Centre for Development of Nuclear Informatics, National Nuclear Energy Agency, Puspiptek Area, Fax. 62-21-7560923, PO BOX 4274, Jakarta (ID); 7 refs; 2 tabs; 1 fig