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Flotation  Depressant
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 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 Sodium dichromates Used for the depression of Pb minerals during Cu/Pb separation.
Florrea D122 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



Florrea depressants can offer a significant economic advantage in flotation of minerals by increasing grade and recovery of metallic concentrates.

Areo 7260 Depessant Areo 7261 Depessant Areo 7262 DepessantAreo 7443 Depessant Areo 7443 Depessant Areo 7443 Depessant Areo 8008 Depessant Areo 8842 Depessant 、Areo 8726 Depessant Areo 8860 Depessant Areo 8860G Depessant Areo 8871 Depessant 、Areo 8898G Depessant Areo 9254 Depessant Areo 9255 Depessant Areo 9256 Depessant 
Areo 9257 Depessant Areo 9349 Depessant Areo 633 Depessant  


  Florrea is world leading supplier on Selective depressants for mineral flotation processes.

Florea's flotation depressants are versatile additives that increase returns for our customers.

Application results in important savings with minimal Health, Safety or Environmental issues.

Depressants and dispersants

In mineral flotation the challenge is to maximize the recovery of desired minerals while rejecting unwanted gangue components.

Depressants are required to give a low affinity to active sites on valuable mineral surfaces and a high affinity for gangue minerals and some sulfides. Typically, depressants prevent collector adsorption or bubble attachment to unwanted mineral surfaces. This increases the selectivity of flotation, rendering certain minerals hydrophilic and preventing them floating to the surface.

Depressants for sulfide minerals

  Depressants for Pyrite

Depressants for Iron sulfide (pyrite, pyrrhotite, marcasite) depressant used in the flotation separation of base metal sulphides. Also used as an alternative partial cyanide replacement to depress iron and zinc sulfides in Pb / Zn flotation

  Depressants for Clay

  Depressants for Pyrrhotite

  Depressants for Bismuth

  depressants for copper minerals

 depressants for zinc minerals

depressants for arsenic minerals


A specialty depressant for pyrite gangue, sphalerite and pyrrhotite in lead and copper flotation systems.

Depressants for  Carbonaceous gangue.

Florrea depressants is a preg-robbing / carbon depressant designed for use in gold beneficiation processes (CIP leaching). Blanks graphitic or carbonaceous gangues, preventing them from binding to gold in solution.

Florrea provide benefits compared with many other process chemicals concerning Health, Safety and Environment:

-       Minimum regulations for storage and handling

-       Minimum harm to environment

-       Minimum toxicity level

-       Exempted from REACH registration


The mining industry faces many challenges, most notably lower quality reserves. With the decreasing quality of mined feed, more sophisticated techniques are needed to achieve industry required specifications. In many cases, the typical means of altering pH or applying different chemistries is not enough to offer the mineral selectivity needed to achieve required recovery and grade goals in flotation. Depressants are often used to increase the efficiency of the flotation process by selectively inhibiting the interaction of one mineral with the collector, for example, the depression of quartzite to allow for more optimal apatite/collector interaction, thus improving final recovery and grade.

Florrea’s flotation depressants have been custom developed for a variety of applications. They help depress gangue minerals while increasing recovery and selectivity without sacrificing grade. Our depressants have been especially effective in phosphate, silica / glass sand and iron beneficiation.

Florrea's technical team is continually developing new reagents for use in other depressant applications

Depressing Reagents

The commonest depressing reagents are lime, sodium cyanide, and zinc sulphate. Lime is extensively used to prevent pyrite from entering the concentrate of other minerals particularly copper and zinc sulphides. Its action is positive and progressive ; it is only necessary to add it to the pulp in sufficient quantity to make the pyrite unfloatable. The other minerals, are depressed at the same time, but can be floated again by the addition of sufficient xanthate, which will have no effect on the pyrite provided that enough lime has been added. If the quantity of reagents needed be prohibitive as regards cost a compromise is necessary ; the lime addition is balanced against that of the xanthate in order to give a profitable recovery of the valuable minerals in a concentrate of the required grade without too much pyrite.

The same method holds good for making a clean concentrate of sphalerite in the second stage of the separation of lead from zinc minerals in a pyritic ore. Here lime is not usually employed in the first stage, where the sphalerite is depressed by sodium cyanide and the galena brought up by carefully controlled additions of ethyl xanthate or thio-carbanilide, because the cyanide generally keeps down the pyrite as effectively as it does the sphalerite. Should lime be required, however, to depress pyrite in the first stage, one of the more powerful higher xanthates will be necessary to give a good recovery of the galena.

Sodium cyanide

Sodium cyanide is mainly used to depress sphalerite in the first or lead-flotation stage in separating lead from zinc minerals. Its action on pyrite is nearly as strong as on sphalerite, but it does not affect galena unless a large excess is added or the contact time is too long.

The effect of sodium cyanide is often intensified by the addition of zinc sulphate. The crystalline salt ZnSO4.7H2O is usually employed, although to save freight charges the lower hydrate ZnSO4.2H2O may be substituted. While no fixed rule can be laid down regulating the proportion of sodium cyanide to zinc sulphate for most efficient work, it is generally found that, for a given ore, the ratio of reagents can be kept constant, although the total quantity used may have to be varied from time to time.

Zinc sulphate

Zinc sulphate does not always intensify the action of the cyanide, the latter often being just as effective by itself ; there are also cases where the former alone gives better results. The most effective reagent or combination can only be found by experiment.

The consumption of sodium cyanide normally ranges from 0.1 to 0.3 lb. per ton of ore and that of ZnSO4.7H2O from 0.3 to 0.9 lb. per ton. These are added to the circuit in the form of solutions containing about 20% of the solid.

Sodium cyanide is occasionally substituted for lime in the flotation of a sulphide copper ore containing pyrite, since it has a much greater depressing effect on the pyrite than on the copper minerals. Xanthate is generally employed to bring up the copper sulphides, its addition being balanced against that of the cyanide to effect a profitable recovery of the copper with the minimum amount of pyrite.

Sodium sulphite was at one time employed as a depressor of sphalerite, its action being much the same as that of cyanide but less effective. Its use is seldom encountered, except in instances where cyanide has been found too powerful

please contact Florrea for new efficient mineral flotation depressants