Recovery of the components of group III-V material aqueous waste

Details Recovery of the components of group III-V material aqueous waste Recovery of the components of group III-V material aqueous waste

1997-10-02

1999-10-26

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75407, 75688, 75706, 75712, 75739, 423 87, 423111, 4231575, C22B 3000, C22B 5800

Patent

active

059720735

ABSTRACT:
The present invention is directed to a method for separating the group III element component of a group III-V material from an aqueous waste containing a group III-V material to allow for their recovery and beneficial use. The method includes adjusting the pH of an aqueous waste containing a group III-V material to a pH from about 9.5 to about 12.5 by adding an alkali metal hydroxide base to the aqueous waste; precipitating a group V element oxyanion by adding a soluble alkaline metal salt to the aqueous waste; separating the group V element oxyanion from the aqueous waste; adjusting the pH of the aqueous waste to form a group III element hydroxide precipitate by adding a mineral acid to the aqueous waste; separating the group III element hydroxide precipitate from the aqueous waste; and recovering the group III element from the group III element hydroxide precipitate.

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