Appeal No. 1997-0844
Application No. 08/269,979
(i) scrubbing some of said waste gases and combining
the resulting liquid with liquid drainage from the waste
gypsum; and
(ii) partially neutralizing and clarifying the
combined liquids to a pH of about 4.5, removing insoluble
contaminants in the underflow, then alkalizing and
clarifying the clarified liquid to a pH of about 11,
removing more insoluble contaminants in the
underflow; and then
(iii) re-acidifying the resulting clarified
decontaminated liquid to a pH of about 6 to 7.
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