Electrochemical process for refining platinum group metals with

Details Electrochemical process for refining platinum group metals with Electrochemical process for refining platinum group metals with

1998-04-17

1999-12-07

Valentine, Donald R.

Electrolysis: processes, compositions used therein, and methods

Electrolytic synthesis

Preparing single metal

205566, 205567, 205704, 205718, 205791, C25C 120

Patent

active

059977191

ABSTRACT:
A process for purifying and refining platinum group metals such as platinum, iridium, palladium, rhodium and the like by an electrochemical process using ammonium chloride as the electrolyte to form ammonium chloride platinum group salts as a "slime" followed by the use of ammonia hydroxide to dissolve and separate said salts from other materials in the slime. A further step to precipitate the platinum metals from the ammonia hydroxide may be employed.

REFERENCES:
patent: 4612093 (1986-09-01), Shor
patent: 4895626 (1990-01-01), Shor
patent: 5009755 (1991-04-01), Shor
patent: 5269912 (1993-12-01), Shor

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