| 摘要 |
<p>This invention provides an organic solvent extraction mixture for the purification of base metals which includes: a) a first extractant, which is a substituted imidazo le (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; R3 = a hydrogen atom or a short chain organic group with 1 or 2 carbon atoms, preferably hydrogen or a methyl group; R4 = a hydrogen atom or a short chain organic group with 1 or 2 carbo n atoms, preferably hydrogen or a methyl group; R2 = a -2-pyridine group in which the pyridine group can be substituted or unsubstituted; or = a -methylene-1-pyrazole group in which the pyrazole group can be substituted or unsubstituted; or = an imidazole based group, which may be a mirror image of the compound shown in Diagram 1 or 2; or = a methylene-amino group as shown in Diagram 3; b) a non selective strongly acidic cation second extractant, such as a sulphonic acid (R-SO2H), to facilitate phase transfer of base metal ions fro m aqueous weakly acidic sulphate solution into the organic phase, and wherein R is an aliphat ic group, either saturated or unsaturated and branched or unbranched, an aromatic organic gro up or a mixed group consisting of aliphatic and aromatic parts, with between 3 and 40 carb on 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 a non-specific aliphatic or aromatic or partly aliphatic, partly aromatic mixture of unspecified composition with moderate boiling point range and a suitable flash point, such as kerosene, Shellsol* (various grades), Escaid* (various grades), Solvesso* and similar products. *Trademark (see diagram 1) (see diagram 2) (see diagram 3)</p> |
