BOPI 03 BR/2023 REPERTOIRE NUMERIQUE 45 composition with a pH of less than 0.5, b) reacting the acid composition obtained in step a) with ozone or heating the acid composition obtained in step a) at a temperature ranging from 110 °C to 130 °C for a time period ranging from 1 to 3 hours, thereby oxidizing the cerium ions in the acid composition to an oxidation state of+IV, c) increasing, to at most 2, such as between 1 and 2, the pH value of the composition obtained in step b), resulting in the precipitation of thorium and cerium compounds, and d) separating the solid concentrate comprising the compounds of thorium and cerium from the composition obtained in step c) to obtain an aqueous acidic rare earth solution depleted in thorium and cerium. The present disclosure further relates to an aqueous acidic rare earth solution depleted in thorium and cerium, obtainable by a method according to the method of the disclosure. Consulter le mémoire ________________________________________ (11) 20880 (51) B01F 13/10 (2018.01); B01F 3/12 (2018.01); B01F 5/00 (2018.01); B01F 5/10 (2018.01) (21) 1202200364 - PCT/IB2021/051857 (22) 05/03/2021 (30) ZA n° 2020/01402 du 05/03/2020 (54) Liquid and slurry mixers. (72) BEYLEFELD, Barend Jacobus (MU) (73) BEYLEFELD, Barend Jacobus, 10 Goodstar, Coastal Road Roches Noires (MU) (74) BEJUKA, ELEBE I.P. & ASSOCIATES SARL, Congres Hall Yaoundé, Rue Jean Paul II, Opposite Boulangerie Socropole, Third Floor, P.O. Box 13758, YAOUNDE (CM). (57) A mixing vessel comprises a top portion (12) on an inverted conical middle portion (14) and a mixing chamber (16) below the middle portion. A launder (28) surrounds the upper part of the top portion. Solution from the launder is led to a vertical pipe (46) including a motor driven impeller (42) down to the level of the mixing chamber. Two vertically spaced feed pipes (46, 48) lead from the vertical pipe to enter the mixing chamber tangentially in opposite directions. Fig. 1 Consulter le mémoire
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