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Abstract  

Thermal analysis, mass spectrometry, infrared spectrophotometry, X-ray phase analysis, scanning electron microscopy, and sorption methods were used in the study of thermal transformations of the products of partial hydrolysis of hydrous aluminium nitrate in ammonia medium. It has been found that the process of aluminium nitrate hydrolysis under the conditions applied and in the presence of ammonia gives boehmite as the main product, with some admixture of a basic salt.Aluminium oxide obtained from the products of partial hydrolysis of hydrous aluminium nitrate in ammonia medium at 550°C has a crystalline -Al2O3 structure. Its specific surface, as determined by low-temperature adsorption of nitrogen, exceeds 200 m2g–1. Features of the products are well developed mesopore structure and considerable ability of benzene adsorption. Calcination of the obtained aluminium oxide for 2 h at 900°C reduces its specific surface to about 110 m2 g–1.

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Abstract  

Thermal decomposition and γ-pyrolysis of aluminum nitrate nonahydrate have been investigated by means of X-ray, IR, UV/VIS, TGA and DTA. All the experimental results obtained before and after γ-ray irradiation elucidated the decomposition mechanism.

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Abstract  

The adduct of Al(NO3)3·6CO(NH2)2 has been prepared and characterized by means of chemical analysis, IR spectroscopy, X-ray patterns and microscopy. A thermoanalytical study of Al(NO3)3·6CO(NH2)2 as well as urea, for comparison purposes, under conventional dynamic and quasi-isothermal—quasi-isobaric conditions in air has been carried out. It has been found that the adduct is thermally stable up to about 200°C, i.e. up to higher temperature than the decomposition temperature of the constituent compounds. The thermal decomposition mechanism of the adduct is complex, thus infrared spectroscopy and X-ray diffraction techniques have been used to determine the intermediate products. Aluminium oxide(III) is the final decomposition product.

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1260 °C with intermediate grindings they obtained C 3 A together with insignificant amounts of CaO and C 12 A 7 . Douy and Gervais [ 8 ] prepared pure C 3 A at 1230 °C using spray-drying of calcium and aluminium nitrates aqueous solution

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synthesis, using a mixture of urea and β-alanine as fuel, no further ignition being necessary. Altay et al. [ 2 ] obtained CA 6 at 1,175 °C starting from a mixture of stoichiometric proportions of calcium and aluminum nitrates into 5 wt% aqueous solution of

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types of precursors were prepared using WCS-SimAdd route starting from yttrium–europium–aluminum nitrate solution and different precipitating agents (urea, oxalic acid, and ammonium carbonate). The precursors were fired in order to obtain europium

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Abstract  

The solid-liquid equilibria of the ternary system H2 O-Al(NO3 )3 -Mg(NO3 )2 were studied at 15, 25, 30, 40 and 50C by using a synthetic method which allows to determine all the characteristic points of isothermal sections. In all isotherms the liquidus exhibit two curves corresponding to the saturation in Mg(NO3 )2 ⋅6H2 O and Al(NO3 )3 ⋅9H2 O. Neither double salts nor mixed crystals are observed in the temperature and composition field studied.

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Abstract  

Distribution ratios of Pu(IV) between 7.5M HNO3+0.75M H3PO4+0.3M H2SO4 media and a macroporous anion-exchange resin Amberlyst A-26 (MP) increased from 40 to 250 when 1M aluminium nitrate was added to the aqueous medium. When 1M ferric nitrate was used in place of aluminium nitrate the distribution ratio further increased to 850. The 10% Pu(IV) breakthrough capacities with a 5 ml bed resin column, using synthetic feed solutions containing 1M aluminium nitrate, were 1.4 g l–1, 3.2 g l–1 at flow rates of 30 ml per hour and 10 ml per hour, respectively. The corresponding 10% Pu(IV) breakthrough capacities in the presence of 1M ferric nitrate were 8.5 g l–1 and 12.8 g l–1. More than 97% of plutonium could be recovered from actual analytical phosphate waste solutions.

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Abstract  

The behavior of minor amount of molybdenum(VI) in the presence of large quantity of aluminum nitrate and separation of Mo(VI) from Al(III) with the aid of a chromatographic process onto an alumina column has been studied. The separation of both elements is in favor of the selective uptake of molybdenum by the alumina. The solution containing both elements is an acidified aluminum nitrate of high concentration in aluminum. The work envisage a future separation and purification of radiomolybdenum for the milking of tecnetium-99m.

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