PROCESS FOR REDUCING THE RADIOACTIVITY OF PHOSPHORUS CONTAINING CHEMICAL FERTILIZERS

The invention relates to a process for reducing natural radioactivity during the processes for preparing phosphorus containing fertilizers, also recovering uranium and rare earths. According to the invention, the process consists in settling the radium with barium sulphate, retaining the radium as r...

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Bibliographische Detailangaben
Hauptverfasser: BUNUŞ FLORIN, POPOVICI NECULAI
Format: Patent
Sprache:eng ; rum
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Zusammenfassung:The invention relates to a process for reducing natural radioactivity during the processes for preparing phosphorus containing fertilizers, also recovering uranium and rare earths. According to the invention, the process consists in settling the radium with barium sulphate, retaining the radium as residue, by filtering, followed by extracting the uranium, rare earths, vanadium, iron, chromium etc with di(2-ethylhexyl)phosphate ester and tri-n-octylphosphinic or tributylphosphinic oxide - using as diluent an aliphatic hydrocarbon, separating the extract from phosphonitric solutions or phosphoric acid having a low reactivity and passing it through a plurality of stirring, separating and stripping stages for producing by successive filtrations first a rare earth concentrate and then a uranium concentrate, and recirculating the depleted extract of uranium and rare earth, thereafter. Invenţia se referă la un procedeu pentru reducerea radioactivităţii naturale, în cadrul proceselor de obţinere a îngrăşămintelor care conţin fosfor, cu valorificarea uraniului şi a pământurilor rare. Procedeul conform invenţiei constă din precipitarea radiului cu sulfat de bariu şi reţinerea radiului ca reziduu, prin filtrare, urmată de extracţia uraniului, a pământurilor rare, a vanadiului, fierului, cromului etc. cu ester di(2-etilhexil)fosfat şi oxid tri-n-octilfosfinic sau oxid tributilfosfinic - folosind ca diluant o hidrocarbură alifatică, separarea extractului de soluţiile fosfonitrice sau de acid fosforic cu reactivitate redusă şi trecerea lui prin mai multe trepte de agitare, separare şi stripare, pentru obţinerea, prin filtrări succesive, mai întâi a unui concentrat de pământuri rare, apoi a unui concentrat de uraniu, după care extractul epuizat de uraniu şi pământuri rare se recirculă.