C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/62 (2006.01) C02F 1/66 (2006.01)
Patent
CA 2643909
A method for removing metals from metal-containing acidic mine wastewater uses a basic sludge produced by the method for treating the wastewater. The wastewater is mixed with a lime slurry and with the basic sludge. This mixture is allowed to separate into an aqueous effluent and an acidic sludge. The effluent is mixed with the lime slurry and with a composition containing an iron compound, to produce a mixture. This mixture is allowed to separate into an aqueous effluent and the basic sludge. Lignin derivatives, such as calcium lignosulfonate, may be included in the treatment mixture.
L'invention concerne un procédé permettant d'extraire des métaux d'eaux usées minières acides contenant des métaux au moyen d'une boue basique produite par le procédé de traitement des eaux usées. Le procédé consiste à: mélanger les eaux usées à une suspension de chaux et à la boue basique; laisser le mélange se séparer en effluent aqueux et en boue acide; mélanger l'effluent à la suspension de chaux et à une composition contenant un composé ferreux pour produire un mélange; laisser se séparer le mélange en un affluent aqueux et en boue basique. Des dérivés de lignine tels que du lignosulfate de calcium peuvent être inclus dans le mélange de traitement.
Walsh Anthony S.
Zhuang J. Ming
Noram Engineering And Constructors Ltd.
Oyen Wiggs Green & Mutala Llp
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