Method for removing inorganic contaminants from soils via a...

B - Operations – Transporting – 09 – C

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B09C 1/02 (2006.01) B09C 1/08 (2006.01)

Patent

CA 2723101

A method for decontaminating soils that are contaminated with an inorganic contaminant, comprising: screening the contaminated soils in order to obtain coarse and fine fractions; sieving the screened soils in order to retain therefrom the coarse fractions and, concurrently, washing the screened soils in order to obtain a first effluent comprising the washing liquid and the fine fractions flowing from the sieve and comprising fines and particles with dimensions greater than those of the fines; separating the fines from the first effluent in order to recirculate fresh water and thus obtain a second effluent; ensuring the supply of the washing operation; and conveying the contaminated fines separated from the first effluent to a chemical chamber where a portion of the first effluent and a chemical solution are added in order to produce a third effluent (acid), the latter containing metals dissolved in the fines that it is necessary to separate. The fourth effluent comprises the fines and a precipitation of this effluent is produced in order to extract the precipitated contaminants, so as to obtain a fifth effluent, whereby the inorganic contaminant is extracted and it is possible to reuse the fifth effluent for recirculation in the treatment process.

Une méthode pour décontaminer des sols d'un contaminant inorganique, comprenant: cribler les sols contaminés afin d'obtenir des fractions grossières et fines, tamiser les sols criblés afin d'en retenir les fractions grossières et, concurremment, laver les sols criblés afin d'obtenir un premier effluent comprenant le liquide de lavage et les fractions fines s'écoulant du tamis et comprenant des fines et des particules de dimensions supérieures à celles des fines, séparer les fines du premier effluent pour recirculer de l'eau propre et ainsi obtenir un second effluent, assurant l'alimentation du lavage, acheminer les fines contaminées et séparées du premier effluent vers une chambre chimique où une partie du premier effluent et une solution chimique sont ajoutées pour produire un troisième effluent (acide), celui-ci contenant des métaux dissous dans les fines qu'il faut séparer; le quatrième effluent comprend les fines et une précipitation de cet effluent est produite pour extraire les contaminants précipités, afin d'obtenir un cinquième effluent; par lequel le contaminant inorganique est extrait et on peut réutiliser le cinquième effluent pour une recirculation dans le procédé de traitement.

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