Electrochemical cover for inhibiting diffusion/infiltration...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/461 (2006.01) B09B 1/00 (2006.01) C02F 1/467 (2006.01)

Patent

CA 2392072

Acidity in water leaching from a mass of sulphide tailings is prevented by de- oxygenating the water prior to entering the mass. A cover comprising an electrolytic cell, either galvanic or impressed-current, gives rise to a cathode reaction in which the redox voltage of the water drops to 003 volts or less. The cover can be thinner, and much less expensive, than an equally-effective non-reactive cover. The electrolyte is water contained in water-retaining soil, or a depth of water, lying over the cathode. The cathode is steel mesh, or a layer of graphite, spread over the whole mass of tailings.

Selon l'invention, on empêche l'eau de lixiviation d'une masse de résidus sulfurés de devenir acide par désoxygénation de l'eau avant pénétration dans la masse. Une couverture comportant une cellule électrolytique, galvanique ou par courant imposé, permet d'augmenter une réaction de cathode durant laquelle la tension redox de l'eau descend à 0,3 volts ou moins. La couverture peut être plus fine et nettement moins coûteuse qu'une couverture non réactive ayant la même puissance. L'électrolyte est composé d'eau contenue dans une souillure retenant l'eau, ou une certaine profondeur d'eau présente au dessus de la cathode. La cathode est une maille d'acier ou une couche de graphite étalée sur l'ensemble de la masse de résidus.

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