| Separation and purification of platinum by solvent extraction have many advantages, such as simple process, high efficiency and safe operation. This article reviews the progress in the solvent extraction method of platinum using four different extractants which are amine, neutral phosphorus and ionic liquid and novel extractant. The advantages and disadvantages of these extractants are also discussed. Owing to their advantages of high extracting capacity and low cost, amine and neutral phosphorus extractant have been widely applied to the purification and separation of platinum, but their selectivity is relatively poor. The research of ionic liquids started late. Although the selectivity of ionic liquids is better, high cost remains a problem. Therefore, there is still a long way to go before their industrial application. With the increasing requirements for better platinum separation and purification technology, the future development should focus on exploiting efficient and clean novel extractant, exploring synergistic solvent extraction, simplifying process and improving extraction equipment. |
