The invention provides a method for removing a dissolved heavy metal from an aqueous solution. The method comprises dissolving in the aqueous solution a foaming agent of formula (I) or a salt thereof. The method further comprises passing a gas through the aqueous solution to form a foam and separating the foam from the aqueous solution.

The invention provides a method for removing a dissolved heavy metal from an aqueous solution. The method comprises dissolving in the aqueous solution a foaming agent of formula (I) or a salt thereof. The method further comprises passing a gas through the aqueous solution to form a foam and separating the foam from the aqueous solution.

The present invention relates to the use of branched fatty alcohol-based compounds selected from the group of fatty alcohols with 12-16 carbon atoms having a degree of branching of 1-3, and their alkoxylates with a degree of ethoxylation of up to 3, as secondary collectors for the froth flotation of non-sulfidic ores, in combination with a primary collector selected from the group of amphoteric and anionic surface active compounds.

The present invention relates to the use of branched fatty alcohol-based compounds selected from the group of fatty alcohols with 12-16 carbon atoms having a degree of branching of 1-3, and their alkoxylates with a degree of ethoxylation of up to 3, as secondary collectors for the froth flotation of non-sulfidic ores, in combination with a primary collector selected from the group of amphoteric and anionic surface active compounds.

A stabilization process for an arsenic solution comprising thiosulfates, the process comprising: acidifying the arsenic solution to decompose the thiosulfates, to yield an acidified solution; oxidizing the acidified solution to oxidize residual As.sup.3+ to As.sup.5+ and reduced sulfur species to sulfates, to yield a slurry comprising elemental sulfur; separating elemental sulfur from the slurry to yield a liquid; oxidizing the liquid to oxidize residual reduced sulfur species, to yield an oxidized solution; and forming a stable arsenic compound from the oxidized solution.

A stabilization process for an arsenic solution comprising thiosulfates, the process comprising: acidifying the arsenic solution to decompose the thiosulfates, to yield an acidified solution; oxidizing the acidified solution to oxidize residual As.sup.3+ to As.sup.5+ and reduced sulfur species to sulfates, to yield a slurry comprising elemental sulfur; separating elemental sulfur from the slurry to yield a liquid; oxidizing the liquid to oxidize residual reduced sulfur species, to yield an oxidized solution; and forming a stable arsenic compound from the oxidized solution.

Compositions including blends of one or more acrylamide/allyl thiourea polymer as a first depressant, and one or more carboxyalkyl dithiocarbamate compound as a second depressant, and their use as depressants in the beneficiation of sulfide minerals from ores and/or concentrates are disclosed herein, along with methods for selectively separating value sulfide minerals from non-value sulfide minerals in a froth flotation process for the recovery of such value minerals.

Compositions including blends of one or more acrylamide/allyl thiourea polymer as a first depressant, and one or more carboxyalkyl dithiocarbamate compound as a second depressant, and their use as depressants in the beneficiation of sulfide minerals from ores and/or concentrates are disclosed herein, along with methods for selectively separating value sulfide minerals from non-value sulfide minerals in a froth flotation process for the recovery of such value minerals.

The present invention relates to an azolethione flotation collector and application thereof. According to the application, an azolethione compound such as a 1,3,4-thiadiazole-2-thione compound, a 1,3,4-oxadiazole-2-thione compound, a 1,2,4-triazole-3-thione compound or a 1,2,4,5-tetrazole-3-thione compound is used as a mineral flotation collector to be applied to ores containing copper, zinc, lead, nickel, cobalt, platinum, palladium, silver or gold minerals to realize flotation recovery of valuable metal minerals. Compared with common flotation collectors in the existing technologies, the flotation collector of the present invention can effectively improve enrichment and recovery of copper, zinc, lead, nickel, cobalt, platinum, palladium, silver or gold minerals.

The present invention relates to an azolethione flotation collector and application thereof. According to the application, an azolethione compound such as a 1,3,4-thiadiazole-2-thione compound, a 1,3,4-oxadiazole-2-thione compound, a 1,2,4-triazole-3-thione compound or a 1,2,4,5-tetrazole-3-thione compound is used as a mineral flotation collector to be applied to ores containing copper, zinc, lead, nickel, cobalt, platinum, palladium, silver or gold minerals to realize flotation recovery of valuable metal minerals. Compared with common flotation collectors in the existing technologies, the flotation collector of the present invention can effectively improve enrichment and recovery of copper, zinc, lead, nickel, cobalt, platinum, palladium, silver or gold minerals.