Treatment of iron sulphide deposits

Details Treatment of iron sulphide deposits Treatment of iron sulphide deposits

C - Chemistry, Metallurgy

02

F

C02F 5/14 (2006.01)

Patent

CA 2537398

The present invention relates to a method of treating an aqueous system containing or in contact with metal sulphide scale. The method comprises adding to said system, separately or together, sufficient of a synergistic mixture comprising a THP?+¿ salt, an aqueous solution of a strong acid (and optionally a source of nitrogen) to provide a solution containing from 0.1 % to 30 % by weight of the THP?+¿ salt at a pH of less than about 1Ø The scale is contacted with said solution, (thereby dissolving at least part of said scale in said solution) and the dissolved scale is withdrawn from the system.

La présente invention porte sur une méthode de traitement d'un système aqueux contenant ou en contact avec une quantité de sulfure métallique. Le procédé consiste à ajouter au système, séparément ou en même temps, une dose suffisante d'un mélange synergique comprenant un sel THP+, une solution aqueuse d'un acide fort (et éventuellement une source d'azote) pour obtenir une solution contenant de 0,1 % à 30 % en poids du sel THP+ à un pH inférieur à environ 1,0. La dose est mise en contact avec la solution, (ce qui permet de dissoudre au moins une partie de la dose dans la solution), et la dose dissoute est ensuite retirée du système.

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