Abrégé

The present invention relates to a method for recovering at least one precious metal from an aqueous solution containing said metal and particularly to recovery of silver and optionally one or more other precious metals from overflow of a sedimentation unit such as a thickener, a clarifier or a pond.

Classes IPC  ?

• C22B 11/00 - Obtention des métaux nobles
• B03D 1/02 - Procédés de flottation par formation d'écume
• B03D 1/14 - Machines de flottation
• C22B 3/20 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation
• C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p.ex. des rognures, pour produire des métaux non ferreux ou leurs composés

Abrégé

The invention relates to a method and to an apparatus for paste backfill. The apparatus comprises a mixing means configured to produce paste (11), a storage means configured to store paste (11), and a feeding means configured to feed paste (11) to a borehole (1). The mixing means and the storing means is formed of a combined storage and mixing means (2). The feeding means comprises a bottom discharge port (9) configured to feed paste (11) from the combined storage and mixing means (2). The apparatus comprises monitoring means configured to monitor the level of paste (11) in the combined storage and mixing means (2) to maintain the level of paste (11) in the combined storage and mixing means (2) above a setpoint value so as to prevent air from entering the borehole (1) from the combined storage and mixing means (2).

Classes IPC  ?

• E21F 15/00 - Procédés ou dispositifs pour mettre en place les matériaux de remblayage dans les travaux du fond
• B28C 9/00 - Disposition générale ou schéma d'installation

Abrégé

The present invention relates to vacuum belt filter comprising a belt (1) with a plurality of vacuum boxes (2), filter means being arranged to the vacuum boxes, drive means (4) for moving the belt (1), and a suction station (5) for creating an underpressure to the vacuum boxes (2) at the suction station (5). In order to enable liquid-solid sepa- ration at low energy costs and long service interval of the vacuum belt filter, the filter means is in the form of a capil- lary filter, each vacuum box (2) being provided with such a filter and each vacuum box being provided with an outlet (8) having a check valve enabling a fluid flow from the inside space of the vacuum box to the outside of the vacuum box for creating an underpressure in the vacuum box when the suction station (5) is connected to the vacuum box, said check valve preventing a fluid flow through the check valve to the inside space of the vacuum box when the vacuum box leaves the suction station (5). The invention relates also to a filter element, a vacuum box (2) and methods for ser- vicing a vacuum belt filter and a method for liquid-solid sep- aration by means of a belt filter.

Classes IPC  ?

• B01D 33/048 - Filtres avec éléments filtrants mobiles au cours de l'opération de filtration à bandes filtrantes ou analogues supportées par des cylindres perméables pour la filtration avec des bandes filtrantes sans fin

Abrégé

A method for manufacturing a recess plate to be used in a filter device for filtering a suspension, wherein a first sheet is formed to provide a first surface of the recess plate, and a second sheet is formed to provide a second surface of the recess plate vis-a-vis the first surface, reversing the first and second sheets to arrange a first flip side of the first sheet to face a second flip side of the second sheet, the first sheet and the second sheet are mounted to a frame to form a spacing between the first sheet and the second sheet, a foam is injected into the spacing between the first sheet and the second sheet, and after hardening of the foam, the foam, together with the frame, forms a rigid body.

Classes IPC  ?

• B01D 25/00 - Filtres formés par l'assemblage de plusieurs éléments filtrants fixés ensemble ou parties de tels éléments
• B01D 25/21 - Presses à plaque et cadre
• B01D 25/28 - Lixiviation ou lavage des gâteaux de filtration dans le filtre
• B01D 25/30 - Dispositifs d'alimentation