Is water needed in the extraction of aluminium from bauxite in either the Bayer or Hall-Heroult proccesses?

Please reply as soon as you can :) hehe

Yes, a slurry is formed.

http://www.google.com/search?q=water+bayer+aluminum&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a