Enhanced ettringite formation for the treatment of hazardous liq

Details Enhanced ettringite formation for the treatment of hazardous liq Enhanced ettringite formation for the treatment of hazardous liq

1994-10-25

1996-08-20

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210911, 210912, 210913, 423128, 423 58, 423 65, 423 87, 423276, 423115, C02F 162

Patent

active

055475884

ABSTRACT:
A process for treatment of hazardous liquid waste comprising trace amounts of hazardous elements in solution as oxyanions by oxyanion fixation within ettringite and related minerals. In accordance with the disclosed process, reagents for forming ettringites are mixed with the waste stream resulting in the formation of oxyanion-substituted ettringite and related materials. The resulting ettringite and related minerals are separated by filtration from the liquid. Thereafter, the liquid, having an elevated pH, is neutralized by carbon dioxide sparging resulting in precipitation of excess reagents in the liquid. Thereafter, the precipitates are filtered, producing a clean liquid.

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