Abstract:
A method for a quantitative separation of scandium from thorium comprises adsorption of both metals on a cation exchange resin followed by selective elution of scandium with an acidic solution of a chelating agent followed by the elution of thorium by a six normal hydrochloric acid solution.
Abstract:
L'invention se rapporte à un procédé de préparation d'une poudre d'un oxyde d'au moins un métal, chaque métal ayant un nombre d'oxydation compris entre (III) et (VI). Ce procédé comprend successivement et dans cet ordre: (a) la réaction, avec un composé comprenant un hydroxyde, d'une solution aqueuse comprenant, pour chaque métal, au moins un sel du cation dudit métal, (b) la séparation du précipité obtenu, (c) la mise en contact du précipité séparé avec un solvant polaire protique organique, (d) l'élimination du solvant polaire protique organique par séchage sous vide du précipité. L'invention se rapporte également à un procédé de fabrication d'une pastille d'un oxyde d'au moins un métal ainsi qu'aux poudre et pastille obtenues selon ces procédés et à leurs utilisations.
Abstract:
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von kugelförmigen Brenn- oder Brutstoffpartikeln aus einem Oxid der Gruppe der Schwermetalle Uran, Thorium, Plutonium oder Mischungen. Dabei werden die Verfahrensschritte Herstellen einer Ausgangslösung der Nitrate des oder der Schwermetalle, Zufügen zumindest einer ersten Reagenzie zum Einstellen der Viskosität der Lösung, Vertropfen der Lösung zu Mikrokügelchen, zumindest oberflächliches Verfestigen der Mikrokügelchen in einer Ammoniak enthaltenden Atmosphäre, Auffangen der Mikrokügelchen in einer Ammoniak enthaltenden Lösung und anschließendes Waschen, Trocknen und thermisches Behandeln durchgeführt, wobei vor Zufügen der ersten Reagenzie der Ausgangslösung Harnstoff und/oder Ammoniumcarbonat und/oder Ammoniumhydrogencarbonat und/oder Ammoniumcyanat und/oder Biuret zugegeben wird und die so hergestellte Lösung auf eine Temperatur T mit 80° ≤ T s mit T s = Siedetemperatur der Lösung erhitzt und über eine Zeit t mit 2 h ≤ t ≤ 8 h gehalten wird.
Abstract translation:本发明涉及一种用于生产该组重金属,铀,钍,钚或其混合物的氧化物的球形燃料或增殖材料颗粒的方法。 在这种情况下,制备的或重金属的硝酸盐的起始溶液的方法步骤,将至少含有第一试剂用于在氨调节溶液的粘度,滴该溶液到微球,至少浅表固化该微球的气氛中含有氨,收集微球 溶液,然后洗涤,干燥和热处理进行时,添加尿素和/或碳酸铵和/或碳酸氢铵和/或氰酸铵和/或缩二脲和如此制备的溶液的初始溶液的第一试剂至80°的温度T之前加入 加热> =沸腾溶液的温度= T 取值 SUB>Ť取值 SUB和时间t 2 = T = 8 H H被保持。
Abstract:
The present disclosure relates to processes for recovering rare earth elements from an aluminum-bearing material. The processes can comprise leaching the aluminum-bearing material with an acid so as to obtain a leachate comprising at least one aluminum ion, at least one iron ion, at least one rare earth element, and a solid, and separating the leachate from the solid. The processes can also comprise substantially selectively removing at least one of the at least one aluminum ion and the at least one iron ion from the leachate and optionally obtaining a precipitate. The processes can also comprise substantially selectively removing the at least one rare earth element from the leachate and/or the precipitate.
Abstract:
Methods for the extraction of cerium and/or thorium from metal compounds and solutions. A single step or two-step extraction method may be applied to selectively precipitate thorium and/or cerium as hydroxides under controlled pH conditions such that a substantially thorium-free and/or cerium-free rare earth element (REE) solution may be formed, such as for the subsequent separation of individual rare earth elements.
Abstract:
A process for producing at least one rare earth chloride from an ore containing the at least one rare earth comprises: contacting the ore containing the at least one rare earth with reactants comprising a carbonaceous reducing agent, chlorine, and a boron-containing Lewis acid in a chlorination reactor to produce a gaseous product and a non-volatile chloride mixture comprising the at least one rare earth chloride.
Abstract:
The invention relates to a process for producing 228 Th from a natural thorium salt, which comprises in succession: a) the separation of the radium from the other radioelements present in this salt, by at least one coprecipitation of the radium by barium sulphate, this coprecipitation comprising: i) the addition of sulphuric acid and a barium salt to an aqueous solution of said natural thorium salt in order to form a barium-radium sulphate coprecipitate and ii) the separation of the coprecipitate from the medium in which it has formed; b) the extraction of the thorium 228 coming from the decay of radium 228 from the coprecipitate thus separated; and, optionally c) the purification and concentration of the 228 Th thus extracted. Applications: manufacture of radiopharmaceutical products useful in nuclear medicine, in particular in radioimmunotherapy for the treatment of cancers and AIDS.
Abstract:
The invention relates to a process for producing 228 Th from a natural thorium salt, which comprises in succession: a) the separation of the radium from the other radioelements present in this salt, by at least one coprecipitation of the radium by barium sulphate, this coprecipitation comprising: i) the addition of sulphuric acid and a barium salt to an aqueous solution of said natural thorium salt in order to form a barium-radium sulphate coprecipitate and ii) the separation of the coprecipitate from the medium in which it has formed; b) the extraction of the thorium 228 coming from the decay of radium 228 from the coprecipitate thus separated; and, optionally c) the purification and concentration of the 228 Th thus extracted. Applications: manufacture of radiopharmaceutical products useful in nuclear medicine, in particular in radioimmunotherapy for the treatment of cancers and AIDS.
Abstract:
Method for the preparation of ultrapure active metal fluorides of increased purity from their metal oxides by reacting an active metal with a predetermined amount of HF(aq) to form a solid reaction product which is dried under controlled heating to form a hydrated fluoride. This hydrated active metal fluoride is then subjected to reactive atmosphere processing comprising hydrofluoric acid vapor in a CO2 reactive carrier gas and a selected fluoride compound in the gas phase for a predetermined period of time to further increase anion purity.