BOPI 04 BR/2024 REPERTOIRE NUMERIQUE 28 a gravel pack that comprises non-aqueous gravel pack carrier fluid and proppants. The systems and methods may also include hydrolyzing degradable polyester that is associated with the gravel pack and degrading at least one portion of the filter cake. Fig. 1 ________________________________________ (11) 21506 Consulter le mémoire (51) C22B 1/00 (2018.01); C22B 15/00 (2018.01); C22B 3/04 (2018.01); C22B 3/26 (2018.01) ; C22B 3/44 (2018.01) (21) 1202300397 - PCT/IB2022/053011 (22) 31/03/2022 (30) NL n° N°2027874 du 31/03/2021 (54) Treatment of hydrous ore materials. (72) PRETORIUS, Gerard (ZA) (73) AFRICAN RAINBOW MINERALS LIMITED, ARM House, 29 Impala Road, Chislehurston, 2196 SANDTON (ZA) (74) S.C.P. AKKUM AKKUM & Associates, No. 1777, Rue 6.261, Auditorium Jean Paul II, Quartier Mbankolo B.P. 4966, YAOUNDE (CM). (57) A method of treating a hydrous ore material metal values includes a digestion step in which a solution of ferrous chloride (FeCI2) and a divalent chloride of the at least one other metal (M2+Cl2) is produced by contacting the hydrous ore material with gaseous hydrochloric acid. In a crystallisation step, crystallising a solid ferrous chloride hydrate (FeCI2-xH2O, wherein x>1) and a solid divalent chloride hydrate of the at least one other metal (M2+Cl2-zH2O, wherein z>1) from the solution. In a dehydration step, the FeCI2-xH2O and the M2+CI2-zH2O are subjected to temperature treatment to produce FeCI2-yH2O, wherein x>y>0, and M2+Cl 2-aH20, wherein z>a>0. In a thermal decomposition step, the FeCI2-yH2O is 0 decomposed to produce anhydrous gaseous hydrochloric acid (HCI), which is used as the digestion reagent in the digestion step. Fig. 1 ________________________________________ (11) 21507 Consulter le mémoire (51) C22B 1/00 (2018.01); C22B 15/00 (2018.01); C22B 3/04 (2018.01); C22B 3/26 (2018.01) ; C22B 3/44 (2018.01) (21) 1202300398 - PCT/IB2022/053009 (22) 31/03/2022 (30) NL n° 2027874 du 31/03/2021
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