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.

Abstract: A cleaning system for electrolytic tanks consisting of a cell with a preferably rectangular layout, very long relative to its width, and which is provided with at least one conduit with perforated walls, and preferably two, which run over the bottom of the cell, along its length, and ascend alongside the shorter walls until they reach, approximately, the level of liquid of the tank, said cell being provided below with surfaces which are inclined towards the perforated conduits, said conduits having sufficient cross-sectional area to act as guides through which are inserted a suction head and pipe for sludge extraction.

Abstract: A procedure and machine for cleaning the anodes of electrolytic tanks, said procedure comprising the operations of mechanically breaking the deposits on the surfaces of the anodes, detaching and separating the deposits, once broken, and then subjecting the plate of the anodes to a flattening operation. The procedure is carried out with a machine which includes at least one pair of cutting rollers (1), nozzles for supplying jets of water under pressure (2) situated above said rollers (1), two flattening plates (3) with flat opposing surfaces, and means of suspending and raising the anodes (13) between the rollers (1), nozzles (2) and plates (3). The plates (3) may be provided on their opposing surfaces with cutting grooves.

Abstract: A procedure and machine for cleaning the anodes of electrolytic tanks, said procedure comprising the operations of mechanically breaking the deposits on the surfaces of the anodes, detaching and separating the deposits, once broken, and then subjecting the plate of the anodes to a flattening operation. The procedure is carried out with a machine which includes at least one pair of cutting rollers (1), nozzles for supplying jets of water under pressure (2) situated above said rollers (1), two flattening plates (3) with flat opposing surfaces, and means of suspending and raising the anodes (13) between the rollers (1), nozzles (2) and plates (3). The plates (3) may be provided on their opposing surfaces with cutting grooves.

Abstract: A cathode for the electrolytic deposition of non-ferrous metals has a plate (1) which, starting from at least one of its vertical edges, is provided on both sides with coinciding zones (5) of dielectric material. The dielectric material is located where a number of penetrators that cause the upper edges of the deposited layers of zinc to detach contact the plate. The plate (1) is provided with a slot (7) that coincides with upper regions of the dielectric material. The slot has a flat piece (5) of dielectric material in it, equal in thickness to the plate (1) and with surfaces which are flat and coplanar with those of the plate (1). The piece (5) and the slot (7) are provided with mutually cooperating portions that prevent the movement of the piece in any direction.