método para recuperação de prata de resíduos de lixívia de zinco contendo enxofre

The invention relates to a method of recovering silver and a method of controlling a leaching process for recovering silver from a direct zinc leach residue, an apparatus for recovering silver from a direct zinc leach residue, a control system for implementing the control method, and a computer prog...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MIETTINEN, VILLE, AHTIAINEN, RIINA
Format:	Patent
Sprache:	por
Schlagworte:	CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F FERROUS OR NON-FERROUS ALLOYS INORGANIC CHEMISTRY INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING METALLURGY PHYSICS PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TESTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The invention relates to a method of recovering silver and a method of controlling a leaching process for recovering silver from a direct zinc leach residue, an apparatus for recovering silver from a direct zinc leach residue, a control system for implementing the control method, and a computer program. The method comprising the steps of: 1) a silver leaching step, wherein the direct zinc leach residue is subjected to oxidative chloride leaching, having the following conditions: 1) chloride concentration of the leach solution in the range of 25-70 g/l ii) pH of the leach solution in the range 1.6 - 2.6 iii) redox potential of less than 460 mV (Pt vs. Ag/AgCI) 2) a silver recovery step, wherein silver is recovered from the silver containing leach solution.