INSTITUTO SABATO

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https://nuclea.cnea.gob.ar//handle/20.500.12553/771

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Examinando INSTITUTO SABATO por Materia "ACETILACETONA"

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  • Miniatura
    ÍtemAcceso Abierto
    Purification of beryllium by acetylacetone EDTA solvent extraction: procedure and chemistry
    (1965) Bamberger, C. E. L.; McDuffie, H. F.; Baes, C. F.
    A procedure, described previously, for the preparation of high purity beryllium hydroxide has been improved and demonstrated on a kilogram scale, and a systematic study of its chemistry has been carried out. The Be(OH)2·xH2O starting material is dissolved in acetylacetone (HX) as BeX2, scrubbed with aqueous EDTA to remove metallic impurities, stripped with nitric acid, and precipitated with ammonia. The dried Be(OH)2 · 0.3 H2O, a granular, free-flowing powder, was obtained in 85% yield. Detectable metallic impurities totalled <5 parts/106. The variation of BeX+ and BeX2 formation quotients with ionic strength as well as the variation of BeX2 and HX distribution coefficients with both aqueous ionic strength and organic phase composition are summarized. Decontamination efficiencies for some 13 cations were estimated to be very high. Effective purification was demonstrated on a sample of Be(OH)2 starting material which was contaminated with 1000 parts/106 parts BeO of Na+, Mg2+, B(III), Cu2+, Al3+, Fe3+ and Cr3+
  • Miniatura
    ÍtemAcceso Abierto
    Purification of Beryllium by Acetylacetone-EDTA Solvent Extraction
    (Academic Press Inc., 1963) Moore, R. E.; Shaffer, J. H.; Baes, C. F. jr.; McDuffie, H. F.; Bamberger, C. E. L.
    A solvent extraction process for the purification of beryllium has been described previously in which ethylenediamine tetraacetic acid (EDTA) is used as a masking or sequestering agent to retain metallic impurities in an aqueous phase from which the beryllium is extractad into au organic phase (CCU) as a complex with acetylacetone (HX). Subsequent back extraction of the beryllium into nitric acid, follovved by the precipitation of beryllium hydroxide, filtering, drying, and calcination to 1000°C, has given BeO products of high purity. Approximately 1300 gm of BeO have been preparad in 23 batches. The average impurity content of these batches (based on BeO) has been very low—less than 10 ppm each of Ca, Al. and Si; less than 5 ppm each of Fe, Mg, and Cu; all other metallic impurities were below the level of detection by the spectrographic method of analysis. The maximum impurity contents for individual metallic species among all these batches were, in ppm BeO, Al-9, Ca-10, Cu-13, ^Ig-5, Fe-10, Si-11; these are considered to reflect the difficulty of keeping small batches free from contamination by dusty air and should not occur in larger operations.