Depressants flotation

In mineral technology, sulfur dioxide and sulfites are used as flotation depressants for sulfide ores. In electrowinning of copper from leach solutions from ores containing iron, sulfur dioxide prereduces ferric to ferrous ions to improve current efficiency and copper cathode quaHty. Sulfur dioxide also initiates precipitation of metallic selenium from selenous acid, a by-product of copper metallurgy (326). 

Flotation depressants It was indicated earlier that the release of oil soluble carboxylic acids may be responsible for the retention of Ca/Ca-Mg carbonates by the kerogen-organic binder pellets. Chemical flotation depressants are sometimes applied to overcome the collecting tendency of fatty acids and thus to increase the water wettability of the carbonate particles in the presence of carboxylin acids.( ) The introduction of such flotation depressants, including sodium oxalate, chromium nitrate, copper nitrate, ferric sulfate and aluminum nitrate failed to improve the beneficiation process described here. 

The above descriptions show the monomeric structures of starch, dextrin, cellulose, and guar gum. In reality, these polysaccharides can be extracted from different sources and the chain length and configuration, molecular weights, and the contents of impurities may vary considerably. Generally, starches have been used mainly as flocculants or flotation depressants for iron oxide minerals and phosphate minerals while the associated silica is floated. Dextrin has been mainly tested as depressants for inherently hydrophobic minerals such as talc, molybdenite, and coal [96]. Applications of polysaccharides in other mineral systems, both in the laboratory and in commercial processes, have also been frequently reported. As can be seen, the polysaccharides have been used or tested as selective depressants in practically all types of mineral systems, ranging from oxides, sulfides, salt-type, and inherently hydrophobic minerals. 

Hazardous Decomp. Prods. Heated to decomp., emits acrid smoke Uses Emulsifier, stabilizer, thickener in pharmaceuticals, adhesives, inks, textile printing, cosmetics, foods flotation depressant protective colloid mfg. of spray-dried flavors lithographic reagent lubricant emollient thickener, stabilizer for soft drinks, cake mixes, confectionery tablet binder/disintegrant/excipient gellant in medicated cough drops film-fonner for coat pills encapsulation for liposol. vitamins sus-... 

Uses Binder, emulsion stabilizer, vise, control agent, emulsifier, film-former, protective colloid, stabilizer, suspending agent, thickener in foods, cosmetics, pharmaceuticals thickener, protective colloid in emulsion paints, adhesives binder in ceramics suspending agent in PVC polymerization protective colloid in suspension polymerization mineral flotation depressant hair preps. in blow-molded bottles tablet coating aid in... 

Uses Pigment in white and opaque glass, plastics, rubber, dyeing, paints, linoleum, leather, dental rubber fluorescent pigment in paints and plastics ingred. of lithopone fungicide anhydrous in x-ray screens, TV screens flotation depressant for sphalerite ores flame retardant in plastics, elastomers, textiles, paper depilatory agent in cosmetics in food-pkg. adhesives filler in food-contact rubber articles for repeated use colorant in food-contact polymers in lubricants for incidental food-contact use... 

Uses Flotation depressant anticaking agent in foods, salt heavy metal scavenger Calcium fluoride... 

Hazardous Decomp. Prods. Heated to decomp., emits very toxic fumes of HNO3 and NOx Storage Keep away from heat and open flames Uses Mfg. of explosives, disinfectants, photographic chemicals flotation depressant for copper ores... 

Uses Antistat, binder, emulsion stabilizer, film-former, vise, control agent, thickener, suspending agent, stabilizer, slip agent, flocculant in cosmetics mineral flotation depressant textile auxiliaries vise, builder for oil-well workover/completion fluids binder, surfactant, lubricant, plasticizer in ceramics dry str. and formation aid in mfg. of paper/paperboard in contact with aq.ffatty foods... 

Uses Flotation depressant for copper ores Manuf./Distrib. ABCR http //www.abcr.de, Acros Org. http //www.acros.be, Aldrich http //www.sigma-aldrich.com, FI uka http //www.sigma-aldrich.com. Sigma... 

Sodium diisobutyl dithiophosphate Sodium diisopropyl dithiophosphate Sodium di-(methylamyl) dithiophosphate Stearyl hydroxyethyl imidazoline flotation collector, zinc sulfide ore Sodium di-s-butyl dithiophosphate flotation depressant Acacia Calcium ferrocyanide Carboxymethylcellulose sodium Hydrofluoric acid Potassium ferricyanide Potassium ferrocyanide Sodium metabisulfite flotation depressant, copper ores Dicyandiamide Guanidine nitrate 2-Mercaptoethanol Phosphorus pentasulfide Quinolinic acid... 

Sodium bisulfide Sodium cyanide Sodium ferrocyanide Sodium sulfite Sodium thiosulfate anhydrous Sodium thiosulfate pentahydrate flotation depressant, mineral Acrylamide/sodium acrylate copolymer flotation depressant, minerals Hydroxyethylcellulose ... 

Hydroxypropylcellulose Hydroxypropyl guar flotation depressant, mining Zinc hydrosulfite... 

Naturally hydrophobic minerals such as graphite and talc are common gangue minerals found in sulfide ores and are difficult to separate due to their tendency to float together with valuable sulfide minerals. Despite the relatively successful use of the polysaccharide group of chemicals (e.g., dextrin, guar gum, and carboxymethyl cellulose) as flotation depressants for these naturally hydrophobic minerals, the nature of the adsorption processes remains in debate. Consequently, the adsorption of amphipathic solutes at naturally hydrophobic minerals such as coal and graphite, talc, and sulfur is of interest to many researchers, and a substantial amount of research has been discussed. 

Uses Mineral processing surfactant flotation depressant zinc sulflde depressant ... 

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