초록 ▼

A method for processing soot containing one or more rare earths, wherein said soot is contacted with an oxygen-containing gas, is disclosed. The method comprises (a) preparing an aqueous phase comprising a dispersion of at least one oxygenated metal compound; (b) simultaneously or consecutively cont

A method for processing soot containing one or more rare earths, wherein said soot is contacted with an oxygen-containing gas, is disclosed. The method comprises (a) preparing an aqueous phase comprising a dispersion of at least one oxygenated metal compound; (b) simultaneously or consecutively contacting a suspension from step (a) with an organic phase including at least one amphiphilic agent and preferably an organic mixture or compound as the solvent; and c recovering the organic phase. Said oxygenated metal compound is produced by means of a method according to which a solution including at least one soluble rare-earth salt, usually an acetate and/or a chloride, is prepared; the solution is contacted with a basic medium and the resulting reaction mixture is maintained at a basic pH; and the precipitate formed by atomization or freeze-drying is recovered. Said method is useful in inorganic synthesis and catalysis.

대표청구항 ▼

[ What is claimed is:] [1.] Process for preparing a colloidal dispersion comprising at least one oxygenated rare-earth compound, comprising the following steps:(a) preparing an aqueous phase comprising at least one oxygenated metal compound in dispersion;(b) bringing into contact the dispersion of s

[ What is claimed is:] [1.] Process for preparing a colloidal dispersion comprising at least one oxygenated rare-earth compound, comprising the following steps:(a) preparing an aqueous phase comprising at least one oxygenated metal compound in dispersion;(b) bringing into contact the dispersion of step (a) with an organic phase including at least one amphilic agent to form a reaction mixture; and(c) recovering the organic phase; and wherein said oxygenated metal compound is obtained by a process comprising the steps below:.alpha.) preparing a solution comprising at least one soluble rare-earth salt;.beta.) bringing the solution into contact with a basic medium and maintaining the reaction mixture thus formed at a basic pH; and.gamma.) recovering the precipitate formed by atomization or freeze-drying.