http___fulir.irb.hr_2128_.xml
http___fulir.irb.hr_2138__1.xml
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Tomažič, B.; Branica, Marko; Težak, B. (1962) Precipitation and hydrolysis of uranium(VI) in aqueous solutions: uranyl nitrate – potassium hydroxide. Croatica Chemica Acta, 34 (4). Abstract The precipitation and hydrolysis of uranium (VI) in aqueous Solutions of uranyl nitrate — potassium hydroxide — neutral electrolyte, was investigated. Clear and stable systems of uranyl nitrate and potassium hyđroxide, were studied, in equivalent concentration of 2 X10-3 N. The pH value, of the mentioned system was between 5 and 6. By addition of neutral electrolytes (potassium, calcium, strontium, barium, yttrium, and lantanum nitrate) the precipitation process was initiated and up to 70% of the uranium present was precipitated. The experimental results showed, that the precipitation of uranium (VI), in the observed system, was accomplished by several mechanisms, t.e. hydrolysis, coagulation, and formation of mixed uranates.
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Branica, Marko; Maljković, D.; Tomažić, B.; Žutić, Vera (1970) Prerada tehničkog koncentrata natrium diuranata u uranov dioksid postupkom elektrokemijske redukcije u poluindustrijskom mjerilu. Kemija u industriji (2). pp. 89-95. Abstract U toku višegodišnjih istraživanja u Institutu »Ruđer Bošković« razrađen je novi hidrometalurški postupak za dobivanje UOs. Postupak se sastoji u elektrokemijskoj redukciji urana(VI) do urana(IV) u karbonatnim otopinama na živinoj elektrodi i taloženju tako nastalog urana(IV) povišenjem temperature13. Prethodna poluindustrijska ispitivanja procesa s nuklearno čistim amonium diuranatom (ADU) pružila su osnovne tehnološke i tehnološko- -ekonomske parametre za preradu ADU do vlažnog uranova dioksida.