Method for the removal of metals from solution by means of...

Details Method for the removal of metals from solution by means of... Method for the removal of metals from solution by means of...

C - Chemistry, Metallurgy

02

F

C02F 1/62 (2006.01)

Patent

CA 2213781

The surprising ability of the polysilicate microgels commonly known as "activated silica" to adsorb and to release heavy metals selectively as a function of pH is used in a novel method for separating metals from dilute aqueous solution by means of selective precipitation with and recovery from an activated silica absorbent, selected changes to the pH. The process is particularly intended for the economic purification of contaminated waste streams to recover valuable but toxic heavy metals from such effluents at a lower cost than hitherto possible, using an activated silica substrate which may be regenerated by alkali treatment.

L'étonnante capacité des microgels de polysilicate, appelés communément "silice activée", d'adsorber et de libérer sélectivement des métaux lourds en fonction du pH est utilisée dans une nouvelle méthode pour séparer les métaux d'une solution aqueuse diluée, par précipitation sélective avec un absorbant à base de silice activée et récupération à partir de celui-ci, et par variations sélectives du pH. Le procédé est particulièrement intéressant pour la purification à coût raisonnable d'effluents de déchets contaminés, et la récupération de métaux lourds toxiques, mais utiles, à partir de ces effluents, à un coût plus bas qu'auparavant, grâce à un substrat de silice activée, pouvant être régénéré par un traitement alcalin.

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