Method for the removal of mercury from sulphuric acid with...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/90 (2006.01)

Patent

CA 2534284

This invention relates to a method for removing mercury from dilute sulphuric acid. According to the method from dilute sulphuric acid solution is scrubbed with an aqueous solution containing thiosulphate, which precipitates the mercury present in the sulphuric acid solution either as mercury sulphide or, in a chlorine-containing environment, as a mercury sulphuric-mercury chloride double salt. The quantity of thiosulphate to be fed is adjusted so that it precipitates the mercury in the sulphuric acid solution, but still does not form elemental sulphur.

La présente invention a trait à un procédé d'élimination de mercure à partir de l'acide sulfurique dilué. Selon le procédé une solution d'acide sulfurique dilué est purifiée avec une solution aqueuse contenant du thiosulfate, entraînant la précipitation du mercure présent dans la solution d'acide sulfurique soit sous forme de sulfure de mercure ou, dans un milieu contenant du chlore, sous la forme d'un sel double de chlorure mercurique de sulfure de mercure. La quantité de thiosulfate à être alimenté est ajustée de sorte qu'il entraîne la précipitation du mercure dans la solution d'acide sulfurique, tout en empêchant la formation de soufre élémentaire.

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