摘要:
Metal values are extracted from aqueous solutions of metal salts containing halide or pseudo halide ions by pyridine derivatives containing the substituent -(COX) A where X is the group-OR, or -NR 2 R 3 and n is 1,2 or 3. R, is a hydrocarbyl group containing from 5 to 36 carbon atoms and R 2 and R 3 are hydrogen or a hydrocarbyl group wherein R 2 and R 3 together contain from 5 to 36 carbon atoms. The process is especially useful for the recovery of metals from leach solutions derived from sulphur-containing ores such as chalcopyrite.
摘要:
An aqueous solution containing palladium is contacted with a solution of heterocyclic ring compound having at least one ring substituent of the type -COX, which is, or contains, a hydrocarbyl group having at least 5 carbon atoms. The hererocyclic ring compound may be a pyridine mono-, di- or tri-carboxylic acid ester, for example the bis-isodecyl ester of pyridine- 3,5-dicarboxylic acid. Other hererocyclic ring compounds include those having a pyrimidine, pyrazine, pyridazine, 1,2,4-triazole or imidazole ring. Palladium is extracted into the water-immiscible solution whilst other metals, particularly platinum group metals, remain in the aqueous solution. The palladium can be stripped from the water-immiscible solution for example using a dilute aqueous solution of ammonia.
摘要:
Metal values are extracted from aqueous solutions of metal salts containing halide or pseudo halide ions by pyridine derivatives containing the substituent -(COX) A where X is the group-OR, or -NR 2 R 3 and n is 1,2 or 3. R, is a hydrocarbyl group containing from 5 to 36 carbon atoms and R 2 and R 3 are hydrogen or a hydrocarbyl group wherein R 2 and R 3 together contain from 5 to 36 carbon atoms. The process is especially useful for the recovery of metals from leach solutions derived from sulphur-containing ores such as chalcopyrite.
摘要:
An aqueous solution containing palladium is contacted with a solution of heterocyclic ring compound having at least one ring substituent of the type -COX, which is, or contains, a hydrocarbyl group having at least 5 carbon atoms. The hererocyclic ring compound may be a pyridine mono-, di- or tri-carboxylic acid ester, for example the bis-isodecyl ester of pyridine- 3,5-dicarboxylic acid. Other hererocyclic ring compounds include those having a pyrimidine, pyrazine, pyridazine, 1,2,4-triazole or imidazole ring. Palladium is extracted into the water-immiscible solution whilst other metals, particularly platinum group metals, remain in the aqueous solution. The palladium can be stripped from the water-immiscible solution for example using a dilute aqueous solution of ammonia.
摘要:
The invention relates to compositions for the extraction of metal values, particularly copper, from aqueous solution by solvent extraction. The composition comprises a strong 2-hydroxy-5-alkylbenzaldoxime extractant and a modifier which is a C10-C30 highly branched aliphatic ester or alcohol. The new modifiers overcome the disadvantages with entrainment and "crud" formation.
摘要:
The invention relates to compositions for the extraction of metal values, particularly copper, from aqueous solution by solvent extraction. The composition comprises a strong 2-hydroxy-5-alkylbenzaldoxime extractant and a modifier which is a C10-C30 highly branched aliphatic ester or alcohol. The new modifiers overcome the disadvantages with entrainment and "crud" formation.