SEPARATION OF IRON FROM ZINC

• Main Authors: SEI YASUHEI, WATANABE CHIKAO, NISHIMURA YAMAJI
• Format: Patent
• Language: English
• Published: 29.09.1983
• Subjects: APPARATUS THEREFOR; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRETREATMENT OF RAW MATERIALS; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; 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

PURPOSE:To transfer selectively Fe ions from an alkylphosphoric acid type extracting reagent contg. Fe and Zn ions to an aqueous soln. contg. NH4HF2, NH4F or HF in simple stages by diluting the reagent with an org. solvent and by bringing the diluted reagent into contact with the aqueous soln. CONSTITUTION:Fe and Zn ions contained in a surface treating liq. or the like are extracted with an org. solvent prepared by diluting >=1 kind of extracting reagent selected from alkylphosphoric acids, alkylarylphosphoric acids, alkylthiophosphoric acids and alkylarylthiophosphoric acids with petroleum hydrocarbon. The org. solvent A contg. Fe and Zn ions is introduced into a separation stage B and brought into contact with an aqueous soln. C contg. one or more among NH4HF2, NH4F and HF to shift the Fe ions from the org. phase to the aqueous phase. The Zn ions present in the org. phase are not transfered to the aqueous phase at all, and they are separated from the Fe ions.