Separation of heavy metals from waste water of the titanium dioxide industry
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United States of America Patent
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Feb 1, 1994
Grant Date -
N/A
app pub date -
Sep 24, 1992
filing date -
Oct 1, 1991
priority date (Note) -
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Abstract
For economical and assured separation of chromium, vanadium and titanium ions from acidic waste waters, which accrue in great quantities in preparation of titanium dioxide, the pH is first raised to around a value of 3 by addition of dolomite brick powder. Directly thereafter, the pH is fine tuned into the range of 4.3 to 4.7 through addition of calcium hydroxide and/or sodium hydroxide, and the hydroxides are separated with the aid of a flocculating agent. Since iron ions and calcium ions remain mainly dissolved in the waste water through such selective precipitation, only a relatively small volume of slush has to be disposed of.
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