Abstract: An installation for eliminating impurities during casting of metals, comprising at least one casting ladle (2) which forms an outlet siphon (3) and can tilt around a transverse axis (14). Starting from the siphon (3), the casting ladle (2) is prolonged by a conduit (4) which ends at a scum-retaining pan (5), wherein the conduit forms a single piece with the ladle and the pan. The pan (5) has outlet orifices (7) at the bottom and is externally lined with a ceramic cloth (10) which acts as a filter for retention of impurities.

Abstract: Procedure for the simultaneous collection and precipitation of mercury in gases containing it. It consists on passing the mercury gas through a washing tower where hydrogen sulfide (gas) is continuously and intermittently injected at the same time that it is watered with a solution containing a mercury complex (II) stable in semi acid, such as ?I.sub.2 Hg!.sup.2- or ?(SCN).sub.4 Hg!.sup.2-, without requiring the use of an additional oxidant. Both the collection and precipitation of the mercury and the regeneration of the solution containing the mercury complex (II) take place simultaneously in just one stage.

Abstract: A facility for removing electro-deposited layers from cathodes, including a cathode reception area, a cathode treatment area with a cathode washing apparatus and an extraction apparatus, and a storage area to store cathodes which have had electro-deposited layers removed. The extraction apparatus includes vertical claws and two parallel rollers mounted so that they are capable of turning freely upon two horizontal parallel bars. The bars are fixed between pairs of arms that are mounted so that they may tilt on a bracket. The bracket also carries upper separating rollers.