PROCESS FOR RECOVERY OF PRECIOUS METALS

A process for the recovery of metals (hereinafter PM) from solids includes dissolving the PM and base metals in acid. The PM are precipitated using substituted quaternary ammonium salts (hereinafter SQAS). The PM may be oxidized or reduced. The substituted quaternary ammonium salts are generally sta...

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Bibliographische Detailangaben
Hauptverfasser:	THOMAS, JOSEPH L, BREM, GERALD F
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS 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 PRETREATMENT OF RAW MATERIALS 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 TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Zusammenfassung:	A process for the recovery of metals (hereinafter PM) from solids includes dissolving the PM and base metals in acid. The PM are precipitated using substituted quaternary ammonium salts (hereinafter SQAS). The PM may be oxidized or reduced. The substituted quaternary ammonium salts are generally stated as H R NX where H = hydrogen, R = organic group, N = nitrogen and X = halide, tetramethylammonium chloride being employed in the Examples. Au-SQAS is separated by washing with solvent. Rh-SQAS is dissolved in acid, oxidized to precipitate salts and separated. SQAS is added to the filtrate, heated and cooled to precipitate Rh- SQAS which is separated. Rh-SQAS is purified before forming a final product. Other metals are separated by boiling the initial acidic solution of metals to precipitate metal salts, cooling and separating. The filtrate is oxidized. Pd-SQAS is dissolved and separated. A slurry is separated by dissolving and separating.