Purification of elemental sulphur

C - Chemistry – Metallurgy – 01 – B

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53/163, 23/329

C01B 17/027 (2006.01) C01B 17/02 (2006.01) C01B 17/033 (2006.01) C01G 13/00 (2006.01) C22B 43/00 (2006.01)

Patent

CA 2037051

A process for removing mercury or other metal impurities from elemental sulphur contaminated therewith includes mixing such elemental sulphur in a molten state with an aqueous sulphide solution or an aqueous solution of sufficiently high pH which reacts with elemental sulphur and forms a sulphide solution to cause extraction of mercury or other metal contaminants from the elemental sulphur into the aqueous sulphide solutions, and separating the aqueous sulphide solution containing mercury or other metal contaminants from the molten elemental sulphur to provide an elemental sulphur product substantially free from mercury and other metal contaminants.

Un procédé pour éliminer le mercure ou les autres contaminants métalliques dans le soufre élémentaire contaminé par ces derniers comprend le mélange du soufre élémentaire à l'état fondu avec une solution aqueuse de sulfure ou une solution aqueuse de pH suffisamment élevé qui réagit avec le soufre élémentaire pour former une solution de sulfure, entraînant l'extraction du mercure ou des autres contaminants métalliques du soufre élémentaire dans des solutions aqueuses de sulfure, et la séparation de la solution aqueuse de sulfure contenant le mercure ou les autres contaminants métalliques du soufre élémentaire en fusion pour obtenir un produit de soufre élémentaire substantiellement exempt de mercure et des autres contaminants métalliques.

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