DETERMINATION OF CONCENTRATION AND EXTRACTION OF VANADYLPORPHYRIN COMPLEXES FROM OIL OF OIL-AND-GAS REGION «NORTH BUZACHI»

For the extraction of vanadylporphyrin complexes from oils of the oil-and-gas bearing region «North Buzachi» at 20 °C, N-N-Dimethylformamide (DMF) was used as an extractant, which shows a good isolating ability of porphyrin complexes into fractions with increasing the polarity. In the visible region the electronic spectra of metalporphyrin concentrates isolated from oil differ slightly and have two intense absorption bands at 573 nm and 534 nm, corresponding to vanadylporphyrin complexes, and at 550 nm, related to nickel porphyrins. According to the calculation method of graphical extrapolation, using the Lambert-Ber formula, content of nickel porphyrins in the extract is 11 times less than vanadylporphyrins. In the FT-IR spectra of porphyrinates, strong deformation vibrations of C-H-pyrrole fragments were detected in the absorption area 809.27 and 3024.79 cm-1, which indicate the presence of vanadium (IV) porphyrinate in the isolated fraction.

Investigation of titanium sorption by sulfocationite from acidic solutions and its desorption from sulfocationite

Investigation of titanium sorption by sulfocationite from acidic solutions and its desorption from sulfocationite

Behavior of lead and selenium during leaching of slurry by solution of trylon B at sulfuric acid workshop of Balkhsh copper production plant

The results of experiments for the study of behavior of lead and selenium during the leaching process of slurry by a solution of trylon B depending on parameters typical for hydrometallurgical processes and their ranges are presented. It has been found out that trylon B practically completely extracts lead into the solution, selenium is concentrated in cake. However, the process is accompanied by precipitation of ethylenediaminetetraacetic acid (C10H16N2O8). Selenium-containing substances were determined in slurry and cakes.

Sorption extraction of rare-earth elements on sulfonic cation-exchange resin KU-2-8 from nitrate solutions of loparite concentrate development

The experimental-industrial study results of the process of sorption of rare-earth elements on sulfonic cation-exchange resin KU-2-8 from nitrate solutions of loparite concentrate development are presented. Values of different obtained elements are discussed. Different changes in processes are described. Reprocessing loparine raw materials in the close cycle without hydrochloric and sulfuric acid, and excess of normative sodium content in productional concentrate is possible. Keywords: ionite, sorption, loparite concentrate, rare-earth element, thorium.

PRODUCTION AND RESEARCH OF TABLETS OF MIXED URANIUM, PLUTONIUM, AMERICIUM AND NEPTUNIUM NITRIDES

The method of carbothermic synthesis produced 260 g tablets of mixed nitrides of uranium, plutonium, americium and neptunium with a mass fraction of americium 0.61%. For the production of tablets were used uranium oxide manufactured by the water method, as well as plutonium dioxide containing impurities of uranium and americium oxides with a mass of 0.9 g americium, obtained by volumetric crystallization method in a NaCl — 2CsCl melt. Neptunium dioxide and americium oxide were added to the mixture of uranium and plutonium oxides before carbothermic synthesis. The resulting tablets had a density of 11.6-11.9 g / cm3. By methods of gamma-spectrometry, scanning electron microscopy and x-ray microanalysis is showed that the heat treatment of the mixture of the source chemicals - oxides of uranium, plutonium, americium, neptunium with carbon black at a temperature 1600-1500 °C for 72 h (24 h in nitrogen and 48 h in nitrogen-hydrogen atmospheres), and also the subsequent sintering synthesized by the press powders for 48 h at a temperature of 1800°C in nitrogen-hydrogen atmosphere doesn't leads in average to the significant losses of americium.