Removal of chromium from solution using mechanically agitated ir

Details Removal of chromium from solution using mechanically agitated ir Removal of chromium from solution using mechanically agitated ir

1993-09-15

1995-01-10

Valentine, Donald R.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210726, 210913, 20412975, 204149, 204130, 423 55, 4231501, B01D 2100, C01F 152, B23H 300, C01G 4900

Patent

active

053804414

ABSTRACT:
Metallic iron particles are added to an aqueous solution containing hexavalent chromium and mechanically agitated. Enough of the surface of the iron particles remains precipitate-free to reduce substantially all the hexavalent chromium to trivalent chromium. Adjustment of pH allows the formation of insoluble precipitates which may be separated from solution using conventional techniques. The properties of the aqueous electrolyte solution are retained, and the solution may be reused.

REFERENCES:
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patent: 3922224 (1975-11-01), Lewandowski
patent: 3960723 (1976-06-01), Butler
patent: 4014766 (1977-03-01), Watanabe et al.
patent: 4108770 (1978-08-01), Roy
patent: 4565633 (1986-01-01), Mayenkar
Article-1992 American Chemical Society, Chapter 7, Removal of Chromate from Aqueous Streams of Ultrafiltration and Precipitation, E. E. Tucker et al. pp. 84-98.
Article-Encyclopedia of Environmental Control Technology, vol. 4, Hazardous Waste Containment and Treatment, Paul N. Cheremisinoff, Editor, in collaboration with R. C. Ahlert et al (1990)-(total of 6 pages including title page).
Article-Remediation of Subsurface Chromium Contamination at a Former Manufacturing Facility, J. L. Pope and J. D. Goedtel, Groundwater Technology, Inc. pp. 1-14.

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