A method for etching copper and recovery of the spent etching solution
Номер патента: EP2165007A1
Опубликовано: 24-03-2010
Автор(ы): Harald Ottertun
Принадлежит: SIGMA ENGINEERING AB
Опубликовано: 24-03-2010
Автор(ы): Harald Ottertun
Принадлежит: SIGMA ENGINEERING AB
Реферат: An etching and recovery method is described, wherein articles made of copper are etched with an acid aqueous solution of etching chemicals containing Cu2+ for oxidising Cu0 to Cu+, chloride ions, oxidising agent which oxidises Cu+ to Cu2+, and pH-adjusting hydrochloric acid. The technical problem to be solved is to make it possible to circulate the etching solution between the etching process and the recovery process during the recovery of used etching solution in such a manner that a closed circuit can be maintained between the processes. This is effected in that a regenerated etching solution containing a lower quantity of Cu2+ than the used etching solution is produced and in that the recovery process has an extraction step in which removed etching solution is mixed with an organic extraction solution of a complexing compound with which Cu2+ forms a copper complex which can be extracted in the organic extraction solution, after which the two mixed liquids are separated once again in order to obtain an organic extraction solution containing said copper complex, and regenerated etching solution. The method is carried out with an etching solution having a pH above 1.5 and a high copper content.
Method for the purification of gases containing mercury and simultaneous recovery of the mercury in metallic form
Номер патента: US4640751A. Автор: Kjetil Borve,Frostein Dyvik. Владелец: Boliden Ab. Дата публикации: 1987-02-03.