BOPI 07 BR/2023 REPERTOIRE NUMERIQUE 25 Planche 1 Consulter le mémoire ________________________________________ (11) 21051 (51) B09B 3/00 (2018.01); C01B 25/238 (2018.01); C01G 21/00 (2018.01); C01G 28/00 (2018.01); C01G 28/00 (2018.01); C01G 9/00 (2018.01); C02F 1/54 (2018.01) ; C02F 1/56 (2018.01) (21) 1202200436 - PCT/EP2021/066246 (22) 16/06/2021 (30) EP n° 20180341.8 du 16/06/2020; EP n° 20195110.0 du 08/09/2020 (54) Process for the removal of heavy metals from a phosphoric acid containing composition using an ionic polymeric surfactant and use of said surfactant in the precipitation of heavy metals in a phosphoric acid containing composition. (72) KITA, Patrycja (PL); VOJNOVIC, Tanja (NO) et BØYESEN, Katrine Lie (NO) (73) YARA INTERNATIONAL ASA, Drammensveien 131, 0277 OSLO (NO) (74) Cabinet BONNY & ASSOCIÉS, LAW FIRM, B.P. 35349, YAOUNDE (CM). (57) The present disclosure provides improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, wherein an organothiophosphorous heavy metal precipitating agent and an ionic polymeric surfactant, particularly a cationic polyacrylamide copolymer surfactant, are both added to a phosphoric acid containing composition, particularly under vigorous mixing conditions, such as between 500 and 700 rpm. The ionic polymeric surfactant promotes the precipitation of the heavy metals. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof. Fig. 1 Consulter le mémoire ________________________________________ (11) 21052 (51) A61P 3/00 (2018.01); A61P 35/00 (2018.01); A61P 7/00 (2018.01); C07D 401/04 (2018.01); C07D 401/14 (2018.01); C07D 403/04 (2018.01); C07D 405/14 (2018.01) ; C07D 413/14 (2018.01)
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