Process for reducing the concentration of dissolved metals...

Details Process for reducing the concentration of dissolved metals... Process for reducing the concentration of dissolved metals...

C - Chemistry, Metallurgy

02

F

C02F 1/62 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2386940

An aqueous solution, for example, effluent from an off-gas scrubber, is treated to remove metal and metalloid ions by in situ precipitation of ferrous ions by the addition thereto of a ferrous ion-containing solution, salt or other such ferrous ion- containing source and a hydroxil-yielding base in the presence of the metals and metalloids. The reaction conditions include a temperature of at least about 60 °C, and a pH of from about 6 to about 10.

Selon l'invention, une solution aqueuse, par exemple l'effluent provenant d'un laveur d'effluent gazeux, est traitée, pour que sa teneur en ions de métaux et de métalloïdes soit éliminée, par précipitation <i>in situ </i>d'ions ferreux, cette précipitation étant obtenue par addition à ladite solution d'une solution ou d'un sel contenant des ions ferreux, ou bien d'une autre source contenant des ions ferreux, et d'une base produisant des groupes hydroxyle en présence des métaux et des métalloïdes. La réaction doit se faire à une température d'au moins 60 DEG C et avec un pH compris entre environ 6 et environ 10.

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