Separation of heavy metals from waste water of the titanium diox

Details Separation of heavy metals from waste water of the titanium diox Separation of heavy metals from waste water of the titanium diox

1992-09-24

1994-02-01

McCarthy, Neil M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210726, 210734, 210912, 423 55, 423 66, 423 85, C02F 162

Patent

active

052829774

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.

REFERENCES:
patent: 2428418 (1947-10-01), Goetz et al.
patent: 2530616 (1950-11-01), Kingsbury et al.
patent: 3544309 (1970-12-01), Fletcher et al.
patent: 4108596 (1978-08-01), Hemming et al.
patent: 5009793 (1991-04-01), Muller

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