Determining rhenium in crude ore by the method of X-ray fluorescence analysis

Optimal conditions of sorption concentration of perrhenate-ions with activated carbon have been considered. The possibility of rhenium determination with accompanying element is show

Topaz concentrate desiliconization with ammonium bifluoride

Fluoridizing agent for the process of topaz concentrate desiliconization has been selected, topaz thermodynamic potentials have been appraised, thermodynamic probabilities of fluorination reaction of topaz concentrate main constituents have been calculated. The results of studying the concentrate desiliconization process with ammonium bifluoride by the methods of thermogravimetry, RFA, microphotography are presente

Studying the utilization techniques of ammonium hexafluorosilicate

The utilization techniques of ammonium hexafluorosilicate have been proposed and studied. Thermodynamic calculations of equilibrium gas phase compositions of topaz concentrate fluoridation reaction and reaction of (NH4)2SiF6 absorption by ammonium hydroxide were given. Experimental investigations in studying gas phase composition were carried out. The sublimation process of ammonium hexafluorosilicate as well as the process of its dissolving in ammonia water with silicon dioxide obtaining was studie

The development of purifying technology of process waters of gas condensate field from methanol

The possibility in principle of methanol deep catalytic oxidation in water up to MPC has been confirmed by gas chromatography method. Oxidation process of methanol contained in vat residue after regeneration stage in concentrations of 1, 5 wt. % and less, at metal oxide catalysts at Al2O3 is considered. The basic flow diagram of closed technological cycle of methanol extraction from process waters of gas condensate fields is proposed. It consists in methanol regeneration with further deep catalytic oxidation of methanol residue quantit

The research of uranium monoxide-oxide dissolution process in nitric acid

The kinetics of concentrates of uranium monoxide-oxide dissolution process by nitric acid solutions of 5...9 mole/l in the range of 11...90 °C has been studied. It is stated that initial nitric acid concentration increasing results in some uranium dissolution degree increasing only at the first process stage. Temperature increasing significantly raises uranium dissolution degree at the first stage as well. Uranium dissolution degree increases for all studied temperatures with increasing of the process period. The main feature of the studied process is that while dissolving uranium monoxide-oxide the behavior of iron, molybdenum, silicon additives is adequate to that of uranium. The equation of the reducing sphere describes the uranium leaching process from its nitric acid concentrate

Rare earth elements materials production from apatite ores

The paper deals with the study of processing apatite ores with nitric acid and extraction of the rare earth elements. The rare earth elements can be successfully separated and recovered by extraction from the nitrate- phosphate solution, being an tributyl phosphate as extraction agent. The developed scheme of the processing apatite concentrate provides obtaining rare earth concentrates with high qualitative characteristics

Extraction of rare earth elements from hydrate-phosphate precipitates of apatite processing

The features of extraction of rare earth elements (REE) were considered from hydrate-phosphate precipitates of REE of apatite processing by nitric acid technology. The preliminary purification of nitrate solution of REE from impurities of titanium, aluminum, iron, uranium and thorium was suggested to obtain stable solutions not forming precipitates. Washing the extract was recommended with the evaporated reextract that allows to obtain directly on the cascade of REE extraction the concentrated solutions suitable for the separation into groups by the extraction method. Technical decisions were suggested for the separation of REE in groups without the use of salting-out agent

РАЗДЕЛЕНИЕ ФТОРИДОВ ЦИРКОНИЯ И ГАФНИЯ СУБЛИМАЦИОННО-СОРБЦИОННЫМ МЕТОДОМ

The process of nuclear grade zirconium tetrafluoride (ZTF) production in a single decomposition stage was proposed and experimentally confirmed. To achieve this goal vapors of the source ZTF has to be run either through the layer of powdery zirconium dioxide with a height of 140–150 mm or above its layer with a length of 1000–1100 mm. The process cascade for the production of nuclear grade pure zirconium tetrafluoride and hafnium tetrafluoride with a hafnium content of over 99 % in a single decomposition stage and without any technological waste was developed and calculated. It was shown that the proposed process cascade for the single stage decomposition and enrichment of zirconium tetrafluoride and hafnium tetrafluoride allows to produce both zirconium tetrafluoride with a hafnium content of up to 0,01 wt.% from the source zirconium tetrafluoride having a hafnium content of 2,0 wt.% and hafnium concentrate containing more than 99 % of hafnium.Предложен и экспериментально подтвержден способ получения тетрафторида циркония (ТФЦ) ядерной степени чистоты за одну ступень разделения. Для этого пары исходного ТФЦ необходимо пропустить внутри слоя порошкообразного диоксида циркония высотой 140–150 мм или над его слоем длиной 1000–1100 мм. Разработан и рассчитан технологический каскад для получения ядерно-чистых ТФЦ и ТФГ с содержанием гафния более 99 % за одну ступень разделения при отсутствии технологических отходов. Показано, что предложенный технологический каскад для разделения и обогащения тетрафторидов циркония и гафния за одну ступень позволяет получить тетрафторид циркония с содержанием гафния до 0,01 мас.% из исходного ТФЦ с концентрацией гафния 2,0 мас.% и гафниевый концентрат с содержанием более 99 % гафния.

Rare earth elements materials production from apatite ores

The paper deals with the study of processing apatite ores with nitric acid and extraction of the rare earth elements. The rare earth elements can be successfully separated and recovered by extraction from the nitrate- phosphate solution, being an tributyl phosphate as extraction agent. The developed scheme of the processing apatite concentrate provides obtaining rare earth concentrates with high qualitative characteristics

Extraction of rare earth elements from hydrate-phosphate precipitates of apatite processing

The features of extraction of rare earth elements (REE) were considered from hydrate-phosphate precipitates of REE of apatite processing by nitric acid technology. The preliminary purification of nitrate solution of REE from impurities of titanium, aluminum, iron, uranium and thorium was suggested to obtain stable solutions not forming precipitates. Washing the extract was recommended with the evaporated reextract that allows to obtain directly on the cascade of REE extraction the concentrated solutions suitable for the separation into groups by the extraction method. Technical decisions were suggested for the separation of REE in groups without the use of salting-out agent