METHOD OF REFINING PALLADIUM

PURPOSE:To refine crude Pd to high purity at a good yield by dissolving the crude Pd with aqua regia under specific conditions, extracting the Pd with a water insoluble org. solvent and reverse extracting the Pd in the org. solvent with an aq. ammonium salt-contg. ammonia soln. CONSTITUTION:The crud...

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Bibliographische Detailangaben
Hauptverfasser:	IJIMA KEIJIROU, HIRAI MOTOYUKI, SUZUKI TETSUYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INORGANIC CHEMISTRY METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS SEPARATION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE:To refine crude Pd to high purity at a good yield by dissolving the crude Pd with aqua regia under specific conditions, extracting the Pd with a water insoluble org. solvent and reverse extracting the Pd in the org. solvent with an aq. ammonium salt-contg. ammonia soln. CONSTITUTION:The crude Pd is dissolved with the aqua regia to prepare the original liquid of =95% purity and the water insoluble org. solvent to extract the Pd in the org. phase. The Pd extracted in the org. phase is then reverse extracted by the aq. ammonia soln. contg. the ammonium salt (ammonium chloride, ammonium bromide, etc.) and hydrochloric acid is added to the aq. soln. in which the Pd is reverse extracted to settle Pd(NH3)2Cl2. The formed precipitate is filtered out in a short period and is successively cleaned by dilute hydrochloric acid and ethyl alcohol. The cleaned precipitate is dried and is calcined in air to form the metal Pd. The crude Pd is thus refined to the extremely high purity at the good yield by the relatively easy operation.