METHOD FOR PRODUCING A BULK CONCENTRATE FOR EXTRACTING PRECIOUS METALS

The invention relates to methods for producing a bulk concentrate for extracting precious metals from clay-salt wastes of factories processing a potash-magnesium ore and rock salt. The inventive method is characterised in that it uses three hydrocyclones having a gradually reducing conicity (10°, 7°, 5°) for separating a solid material which is uniformly distributed in a liquid medium (saturated salt solutions) and embodied in the form of deposition coarse and fine fractions and a floated material in the form of a natural and synthetic organic substance. Sludges with a ratio S:L=1:3 are supplied for hydrocycling. The bulk concentrate produced from clay-salt wastes of the factories processing a potash-magnesium ore and rock salt is embodied in the form of a mixture of deposition and floated materials in the form of a water-insoluble sludge residues. The discharge of the second hydrocyclone in the form of a salt solution and the floated part of the water-insoluble sludge residues with the natural and synthetic organic substance are transported to a third hydrocycling stage. Said stage consists in separating the floted fraction with the natural and synthetic organic substance through a discharge nozzle and in combining it with concentrates of the first and second hydrocyclones. The salt solution in the form of a dressing process tailings is removed through a sand nozzle. Said invention makes it possible to obtain a concentrate containing a natural and synthetic organic substance comprising an important portion of precious metals and to reduce costs. L'invention concerne des procédés d'obtention d'un concentré composé destiné à l'extraction de métaux nobles à partir de déchets argileux-salins des entreprises de transformation de minerais de potassium et de magnésium et de sel gemme. Elle peut s'utiliser également dans l'extraction de deux ou plusieurs composants sous forme de particules solides se trouvant dans des phases différentes, par exemple, sous forme de sédiments et de particules flottables, la phase liquide pouvant être représentée par deux et/ou plusieurs composants à solubilité ou à densité différente. Le procédé d'obtention d'un concentré composé à partir de déchets argileux-salins des entreprises de transformation de minerais de potassium et de magnésium et de sel gemme à des fins d'extraction de métaux nobles comprend l'hydrocyclonage en trois stades des schlamms accompagné de l'obtention de concentré. On utilise pour l'hydrocyclonage des schlamm