초록 ▼

A process for the separation of unwanted ferric, iron and zinc impurities from a cobalt sulphate solution containing these impurities, the process including the steps of (i) reacting the cobalt sulphate solution with an organic reagent specific for the removal of iron and zinc at an initial pH of le

A process for the separation of unwanted ferric, iron and zinc impurities from a cobalt sulphate solution containing these impurities, the process including the steps of (i) reacting the cobalt sulphate solution with an organic reagent specific for the removal of iron and zinc at an initial pH of less 2.8 to remove the majority of the unwanted ferric iron impurities; and (ii) slowly raising the pH of the solution to about 3.5 in order to remove zinc impurities and any remaining ferric iron impurities.

대표청구항 ▼

[ What is claimed is:] [1.] A process for selectively separating unwanted ferric iron and zinc impurities from a cobalt sulphate solution containing said iron and zinc impurities, as well as at least one of chloride and nitrate ion impurities, said process including the steps of:(i) contacting the c

[ What is claimed is:] [1.] A process for selectively separating unwanted ferric iron and zinc impurities from a cobalt sulphate solution containing said iron and zinc impurities, as well as at least one of chloride and nitrate ion impurities, said process including the steps of:(i) contacting the cobalt sulphate solution with bis(2,4,4-trimethylpentyl)phosphinic acid in aliphatic kerosene at an initial pH of less than 2.8 to selectively extract the majority of the unwanted ferric iron impurities from the cobalt sulphate solution; and(ii) raising the pH of the solution to about 3.5 while maintaining contact with the bis(2,4,4-trimethylpentyl)phosphinic acid in aliphatic kerosene in order to extract zinc impurities and any remaining ferric iron impurities from the cobalt sulphate solution.