EP 1061144 B1 20031029 - Method of preparing high purity gold from precious metal bearing nitrate solutions
Title (en)
Method of preparing high purity gold from precious metal bearing nitrate solutions
Title (de)
Verfahren zur Herstellung von Gold hoher Reinheit aus nitrathaltigen Edelmetall-Lösungen
Title (fr)
Procédé pour obtenir de l'or de pureté élevée à partir de solutions de nitrates des métaux précieux
Publication
Application
Priority
DE 19928028 A 19990618
Abstract (en)
[origin: DE19928028C1] High purity gold recovery from nitrate solution involves nitrate decomposition and gold recovery from the resulting highly acidic solution by ferric ion addition. High purity gold is recovered from nitrate-containing precious metal solution by: (a) nitrate decomposition to obtain a solution with \-4 mol/l H<+> ion concentration; and (b) gold ion reduction by addition of an acidic Fe<2+> solution having a \-4 mol/l H<+> ion concentration. Preferred Features: Step (a) is carried out using formic or ascorbic acid at 80-90 deg C, and step (b) is carried out under potential control at 60 deg C.
IPC 1-7
IPC 8 full level
B22F 9/24 (2006.01); C22B 3/20 (2006.01); C22B 3/44 (2006.01); C22B 3/46 (2006.01); C22B 11/00 (2006.01)
CPC (source: EP US)
C22B 11/00 (2013.01 - EP US); C22B 11/04 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
DE 19928028 C1 20000817; DE 50004219 D1 20031204; EP 1061144 A1 20001220; EP 1061144 B1 20031029; US 6331200 B1 20011218; ZA 200003019 B 20010109
DOCDB simple family (application)
DE 19928028 A 19990618; DE 50004219 T 20000524; EP 00111133 A 20000524; US 59512300 A 20000616; ZA 200003019 A 20000615