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Flotation Depressants

Florrea consists of selective depressants and flotation optimisers for a broad range of gangue minerals in mineral beneficiation processes.
They can offer a significant economic advantage in the flotation of minerals by reducing smelter penalties, increasing grades and recovery of mineral concentrates.

Key Benefits:

  • Improved grade and recovery

  • Depression of penalty elements

  • Excellent EHS profile

  • Non-toxic

  • Sustainable products from renewable sources

Our flotation depressants are proven to be effective on a variety of gangue minerals:

  • Sulfide minerals, like pyrite, pyrrhotite, arsenic and bismuth sulfides

  • Oxide minerals, like silicates, talc and calcite

  • Clays and graphite

  • Sulfate minerals, like baryte and gypsum

Ore types depressed

Minerals depressed

Ores to be treated

Florrea depressant

Good replacement for

Iron sulfide ores


Base metal Sulfide ores


Cyanide, Lime



Base metal Sulfide ores


Cyanide, Lime

Arsenic sulfide ore



Cu   Au

Polymetallic   complex ores



Pyrrhotite and arsenides

Pyrrhotite   and arsenides




Copper sulfide ores





Na2S,NaSH,Nokes reagent,

sodium thioglycolate

Lead sulfide ores





Sodium dichromate, Cyanide

Zinc sulfide ores






Zinc sulphate

Sodium metabisulphite

bismuth-containing gangue minerals.


Cu-Au Bismuth


Sodium dichromate, cyanide




Carbonate gangue



D136, D137


Fluorite, Tungsten,Tin,REE



Oxide ores ,Fluorite, Tungsten

D100X, D104, D107,D108,D121

Silicate gangue



D106, D108




Cu,Ni, Cu-Mo



Cu Au


Carbonaceous ores/graphitic or   amorphous carbon


Base metal sulfide ores


                Flotation  Depressants
                Type                Trade Name                Components                Application
D100 series
                Florrea D100                New environmently friendly depressants for copper sulfides ores which can repalce NaSH ( sodium hydrosulfides ) and sodium thioglycolate and Nokes reagents
                Florrea D101                Sodium thioglycolate 20%                Depressant for copper sulfies ores flotation
                Florrea D102                Sodium thioglycolate 40%
                Florrea D106                CMC (Carboxymethyl cellulose) Modified CMC                Used in the depression of magnesium silicates such as talc and pyroxene.
Especially useful in the flotation of PGM and Ni ores
                Florrea D107
                Florrea D108                guar gum                depressant
                Florrea D109                zinc sulphate                Used alone, or in combination with cyanide, for depression of Zn minerals in the flotation of Pb/Zn, Cu/Zn, and Cu/Pb/Zn ores; depression on talc in
by-product molybdenum circuit  
                Florrea D110                sodium cyanide                Depression of iron sulfide minerals such as pyrite, pyrrhotite and arsenopyrite.
Depression of Zn minerals during Pb flotation from Pb/Zn ores
                Florrea D111                sodium ferrocyanide                Depression of iron sulfide minerals such as pyrite, pyrrhotite and arsenopyrite. Depression of Zn minerals during Pb flotation from Pb/Zn ores Depressant for Cu and Fe sulfide in Cu/Mo separation.Strong copper and iron sulfidedepressants in the pH range 6.5–8.5. They are preferably used in separating copper from copper–lead concentrates when secondary copper minerals  
are present and for depression of iron sulfides during nickel– cobalt separation
                Florrea D112                Sodium sulphite                used as a flotation depressant to depress Sphalerite and pyrite in the
flotation of Pb/Zn, Cu/Zn, and Cu/Pb/Zn ores.  
                Florrea D113                sodium bisulphite
                Florrea D114                sodium etabisulphite                can be used in conjunction with either lime or Na2S for depression of pyrite during flotation of copper-zinc ores. It does not depress Chalcopyrite .On the contrary, it can activate Chalcopyrite.It can be used at lower acid circuit. As for those Sphalerite(zinc minerals) which is strongly activated by copper ion,   it is recommended to use sodium sulphite in combination with zinc sulphate, sodium sulphide or sodium cyanide to enforce the depressing performance.
                Florrea D115                SODIUM THIOSULPHATE                depressant
                Florrea D116                AMMONIUM THIOSULPHATE
                Florrea D117                sodium hydrosulphide 70% flake                Used for the depression of Cu and Fe sulfide & Hydrosulfide minerals in Cu/Mo separation.
                Florrea D118                sodium sulphide
                Florrea D119                sodium silicate                widely used in mineral flotation as depressant, dispersant and as controlling agent of some soluble ions
                Florrea D120                Sodium Hexametaphosphate                depressant for gaunge ,used with Florrea depressant D100 can increase concentrate grade .
                Florrea D121                Replacement for Sodium dichromates                Used for the depression of Pb minerals during Cu/Pb separation.
                Florrea D122                Replacement for Potassium dichromates
                Florrea D123                Nokes Reagent(25% Solution)                Used for the depression of Cu and Fe sulfide minerals in Cu/Mo separation
                Florrea D124                Nokes Reagent (20% Solution)
                Florrea D125                DETA(Diethylene triamine)                Used as a depressant for pyrrhotite  and arsenides in Cu/Ni mineral flotation
                Florrea D126                Potassium Permanganates                useful in the separation of pyrite from arsenopyrite
                Florrea D127                Ferro sulfate (FeSO4·7H2O)                depressant and co-depressant for(a) sphalerite together with cyanide (b) fine molybdenite with cyanide
                Florrea D128                ferric chloride (FeCl3)                depressant for barite in barite–celestite separation. Depressant during niobium–zirconium separation. Ferric and ferrous compounds are not selective depressants and in many cases are detrimental for flotation of oxidic and industrial minerals as in the case of anionic flotation, fatty acid,iron complexes or oleate iron complexes
                Florrea D129                aluminum sulphate
                primarily used in non-metallic flotation and in by-product molybdenum circuits. In molybdenum circuits, alum is used for depression of talc at pH 7. Also it can be used for talc depression during the treatment of talcous nickel ores together with carboxyl methyl cellulose. Aluminum salts have a depressing
effect oncalcite, dolomite and barite. It is used as co-depressant during fluoride flotation from the ores containing barite
                Florrea D130                aluminum chloride                Similar to aluminum sulfate, aluminum chloride is used as a co-depressant for calcite, fluorite and dolomite
                Florrea D131                Ammonium sulphate                depressant for sphalerite during flotation of complex copper–lead–zinc ore
                Florrea D132                ammonium chlordie                depressant
                Florrea D133                sodium floride                depressant used exclusively during beneficiation of non-sulfide minerals, as well as the rare-earth minerals as a depressant alone or in combination with other depressants. It is used together with starch as co-depressant for rutile and ilmenite during zirconium– titanium separation or during reverse silicate flotation from rutile and ilmenite with cationic collectors
                Florrea D134                sodium fluorosilicate                rdepessant for silicates,specifically topaz, tourmaline and some aluminosilicates.used in the separation of rutile from zircon, pyrochlore from zircon, cassiterite and tantalite and during flotation of cassiterite for depression of topaz, tourmaline and aegirine
                Florrea D135                potassium fluorosilicate
                Florrea D136                ammonium sulfide                effective depressant for bornite and covellite
                Florrea D147                depressant                depressant for calcium carbonaceous
                Florrea D160                Carbon Depressants
                Florrea D161
                Florrea D163                oxalic acid   depressant for silicate
                Florrea D165                depressant for copper and pyrite
                Florrea D167
                Florrea D168A                depressant for pyrite
                Florrea D168B
                Florrea D170                depressant for SiO2
                Florrea D171                depressant for pyrite
                Florrea D180                Depressants for Zinc Minerals, Pyrite , Arsenic , Copper sulfide mineral. Good Replacement for Cyanide depressants.
                Florrea D181A                Depressants for MgO  
                Florrea D181B
                Florrea D185                Depressants for carbon and graphite  
                Florrea D188A
                Florrea D188B
                Florrea D189A
                Florrea D189B

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