METHOD FOR COLLECTING BISMUTH

PROBLEM TO BE SOLVED: To collect high-purity bismuth.SOLUTION: A method for collecting the bismuth includes: a step (S1) of adding an alkali to an acid solution containing the bismuth and a chloride ion to keep pH within a range of 2.5 or more but less than 4.0, thereby obtaining a slurry that compr...

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Bibliographische Detailangaben
Hauptverfasser:	ASANO SATOSHI, KIKUTA NAOKO
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS 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 METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRETREATMENT OF RAW MATERIALS PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To collect high-purity bismuth.SOLUTION: A method for collecting the bismuth includes: a step (S1) of adding an alkali to an acid solution containing the bismuth and a chloride ion to keep pH within a range of 2.5 or more but less than 4.0, thereby obtaining a slurry that comprises a neutralized precipitate containing the bismuth; a step (S2) of collecting the neutralized precipitate from the slurry; a step (S3) of adding 4 mol/l or more of alkaline solution to the neutralized precipitate collected through the step S2, and then stirring the neutralized precipitate to remove chlorine from the neutralized precipitate; and a step (S4) of collecting a bismuth precipitate.