Degussa Aktiengesellschaft

Rainer Schlodder

Michael Schuster

Karl-Heinz Konig

Norbert Giesecke

Bernd Dorbath

Dieter Hollmann

Hermann Renner

Karlheinz Kleiss

Bernd Steinbrech

Gerd Schneeweis

There is described a process for the recovery of noble metals from dilute aqueous or non-aqueous solution which contain salts of non-noble metals and/or difficulty volatile inorganic or organic compounds, which is generally usable, simple to carry out and supplies high yields of noble metals. There is added to the noble metal solution elemental tellurium or a reducible tellurium compound at a temperature of 100.degree. to 250.degree. C. and the precipitate formed worked up in known manner.

Process for the recovery of noble metals from solutions

There is described a process for the separation and purification of the platinum group metals from base metal out of acidic aqueous solutions. For this purpose there is used a substituted thiourea of the formula

Process for separation and purification of platinum group metals (I)

Process for separation and purification of platinum group metals (II)

Bright, low carat gold-silver-alloy coatings which are ductile and have a thickness up to over 100 .mu.m are obtained from an electrolytic bath containing 0.5 to 25 g/l of gold in the form of alkali gold cyanide, 0.25 to 15 g/l of silver in the form of alkali silver cyanide and 10 to 200 g/l of alkali cyanide as well as 0.001 to 5 g/l of tellurium in the form of a water soluble tellurium compound.

Method and electrolytic bath for the deposition of low carat bright

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Rodenbach, Germany

Rainer Schlodder