To provide a method for recovering a platinum group metal from waste by which treatment of waste containing, as impurity, e.g. a semimetal, such as C and Si, so far difficult to deal with by conventional methods can be made possible.
This method for recovering a platinum group metal from waste containing a platinum group metal such as iridium comprises the following step: a step where the platinum group metal contained in the waste is allowed to react with chlorine in a molten salt composed of sodium chloride or in a molten salt composed of sodium chloride and potassium chloride to form an easily water soluble platinum group metal chloride and then the molten salt after the reaction is mixed with water to undergo solid-liquid separation to obtain an aqueous solution of the platinum group metal. As to the composition of the molten salt, it is desirable that the molten salt consists of sodium chloride and potassium chloride and contains 50 mol% sodium chloride; it is more desirable that the molten salt consists of 75 to 90 mol% sodium chloride and 10 to 25 mol% potassium chloride.
GOTO KENJI
OTA TAKATOSHI
| JP2005240170A | 2005-09-08 | |||
| JPH0257642A | 1990-02-27 | |||
| JPS58194745A | 1983-11-12 | |||
| JPH09227966A | 1997-09-02 |