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pyrite depression in copper flotation

Oct 01, 2016 The mechanism underpinning the depression role of lignosulfonate-based biopolymers on the flotation of un-activated pyrite and copper-activated pyrite has been investigated. In the flotation of un-activated pyrite at pH 5, dixanthogen is the main species responsible for pyrite flotation, the formation of which is accompanied by the reduction of ...

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Depression of pyrite in porphyry copper flotation

• Pyrite in the feed was Cu activated , and adsorbed xanthate even at high pH ( 10.5), becoming highly floatable • Limited pyrite depression was achieved by increasing the pH with lime • Na 2SO 3and DETA were effective in preventing/reversing the activation of pyrite in the presence of O2, reducing pyrite recovery by 50%.

Depression of pyrite in seawater flotation by guar gum

The microflotation tests were performed at pH 8, which is the pH at the copper sulfide processing plants that operate with seawater. Pyrite flotation recovery was correlated with FBRM and PVM characterization to delineate the pyrite depression mechanisms by the guar gum.

The role of sodium sulfide in the flotation of pyrite

Pyrite Depression Flotation Sodium sulfide Sulfidization Surface oxidation products ABSTRACT In copper-gold flotation plants, pyrite which is depressed in copper otation is often oated subsequently with the addition of sodium sulfide (Na 2S) to recover the associated gold. For the first time, this study investigated the role of Na

The Adsorption of Cu Species onto Pyrite Surface and Its

Jan 17, 2016 Copper ions precipitate the collector and reduce the concentration of collector available for pyrite flotation and thus depress the flotation of pyrite. On the other hand, previous studies have suggested that nonactivated pyrite exhibits an excellent flotation performance at acidic and neutral pH, and the adsorption of Cu 2+ on surface S active ...

selective depression of pyrite with polyacrylamide polymers

The preferential depression of pyrite observed in Fig. 1 results from the faster oxidation of pyrite than sphalerite. A recent study has shown that thionocarbamate and thiourea collectors are more selective than xanthates against pyrite and produced a better separation of chalcopyrite or copper-activated sphalerite from pyrite in alkaline and ...

CHAPTER 7 FLOTATION OF SULPHIDE MINERALS

Above pH 11, the surface of pyrite is of ferric hydroxide (Fe(OH) 3), a hydrophilic compound. Calcium ion contributed by lime in pH adjustment also adds to pyrite depression. Flotation is affected about one pH unit lower if CaO is used for raising pH compared with KOH or K 2 CO 3 The pzc for pyrite is at pH = 6.9.

Copper Zinc ores Danafloat

Sphalerite is depressed with zinc sulphate addition to the grind with sodium sulphide as an option for enhancing pyrite depression. Copper is floated in the first differential flotation stage at a 10-11 pH with lime. Xanthate, dithiophosphate and thionocarbamate collectors are used as explained much more extensively in the copper flotation section.

Gold Pyrite ores Danafloat

Natural pH is recommended for gold flotation. Alternatively using soda ash for pH adjustment can reduce gold depression. Where gold is associated with pyrite in base metal ores where iron sulphides are depressed and report to the tailings, a separate tailings pyrite flotation …

The roles of lead ions in restoring the floatability of

Due to the drawbacks of copper ions used to activate pyrite flotation in gold processing plants where free cyanide occurs in process water and the benefits of lead ions in gold cyanidation, this study investigated the counteraction of lead ions on the negative effects of free cyanide on pyrite flotation in an alkaline condition.

Copper Ore Flotation Machine

2 days ago an alternative flotation chemistry was applied on ore b using na2s for surface cleaning and nametabisulfite mbs for pyrite depression in the copper flotation stage the surface cleaning reduced the rate of oxidation of the framboidal pyrite in ore b as a result the copper recovery could be increased to 52 cu for ore b and 65 for the.

Pyrite depressant useful in flotation separation

Jun 17, 1997 The present invention relates to a process for separating pyrite from sulfide ores and coal during flotation separation which comprises the depression of pyrite with from about 0.125 to 1.250 pounds per ton of 2-S thironium-ethane sulfonate (IESA) as a pyrite depressant. The aforementioned depressant is surprisingly effective in pyrite removal ...

Pyrite Reverse Flotation Vetura Mining Machinery

Flotation Of Sphalerite And Pyrite In The Presence Of. 8 min of flotation of 88 in the absence and 73 in the presence of 10 mol dm. y3 3 sodium sulfite. the effect of sodium sulfite on pyrite flotation is more pronounced than on sphalerite flotation with flotation recoveries being reduced by half at a sodium sulfite concentration of 210 y4 mol dm 3. however, at higher sodium sulfite ...

Pyrite Depression in Copper Flotation

Oct 08, 2015 The more flotation collector you have on, the higher you will need to increase that pH for effective pyrite depression. You also need to insure your pyrite and copper minerals are well liberated for good chemical separation by pH. In froth flotation, depressing pyrite or any metal is impossible if minerals are locked.

Effects of Pyrite Texture on Flotation Performance of

Oct 18, 2021 An alternative flotation chemistry was applied on Ore B using Na 2 S for surface cleaning and Na-Metabisulfite (MBS) for pyrite depression in the copper flotation stage. The surface cleaning reduced the rate of oxidation of the framboidal pyrite in Ore B. As a result, the copper recovery could be increased to 52% Cu for Ore B, and 65% for the ...

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