C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/40 (2006.01) C22B 3/34 (2006.01) C22B 3/36 (2006.01)
Patent
CA 2450440
The invention provides an organic solvent extraction mixture for the separation of base metals which includes: a) a first extractant, which is a substituted imidazole (Diagram 1) or benzimidazole (Diagram 2) and wherein the substituents are: R1 = an organic group which has between 2 and 20 carbon atoms, preferably between 6 and 15 carbon atoms; R2 = hydrogen or a methyl group, preferably hydrogen; R3 = hydrogen or a short chain organic group with 1 or 2 carbon atoms, preferably hydrogen or a methyl group; and R4 = hydrogen or a short chain organic group with 1 or 2 carbon atoms, preferably hydrogen or a methyl group; b) a non selective strongly acidic cation second extractant, such as a sulphonic acid (R-S03H), to facilitate phase transfer of base metal ions from aqueous weakly sulphate solution into the organic phase, and wherein R is an aliphatic group, either saturated or unsaturated and branched or unbranched, an aromatic organic group or a mixed group consisting of aliphatic and aromatic parts, with between 3 and 40 carbon atoms, preferably with between 8 and 30 carbon atoms; c) a modifier to improve the characteristics of the organic phase with respect to metal complex solubility to avoid third phase formation, completeness and ease of stripping, viscosity and phase disengagement; and d) a diluent, which is selected from non-specific aliphatic or aromatic or partly aliphatic, partly aromatic mixtures of unspecified composition with a moderate boiling point range and a suitable flash point, such as kerosene, Shellsol* (various grades), Escaid* (various grades), Solvesso* and similar products.
L'invention concerne un mélange d'extraction par solvant organique, comprenant un premier agent d'extraction qui est un imidazole ou un benzimidazole substitué, un second agent d'extraction cationique fortement acide non sélectif tel qu'un acide sulfonique (R-SO3191H) pour faciliter le transfert de phase d'ions de métaux de base d'une solution de sulfate faiblement acide aqueuse dans la phase organique, un agent de modification pour améliorer les caractéristiques de la phase organique par rapport à la solubilité du complexe métallique afin d'éviter à la fois la formation d'une troisième phase, l'extraction en retour complète et facile ainsi que le désengagement de viscosité et de phase, et un diluant.
Du Preez Jan Gysbert Hermanus
Schaekers Jozef Marie
Bhp Billiton Sa Limited
Oyen Wiggs Green & Mutala Llp
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