The use of quebracho extract as a pyrite depressing agent to improve Cu/Fe ratio in copper minerals flotation was studied. The depressing effect in the case of pure pyrite, pure chalcopyrite and a sample of disseminated copper ore was tested considering different pH values and modifiers, and different levels of tannin addition

Oct 01, 2016 1. Introduction. Pyrite (FeS 2), the most abundant sulfide mineral, is undesirably associated with minerals of economic value such as chalcopyrite, sphalerite and galena (Wang and Forssberg, 1991, Wang, 1995, Dimitrijevic et al., 1996, Jiang et al., 1998).To produce and utilize the valuable components, selective depression of pyrite in differential flotation is

In other words, a large amount of lime is necessary to alter and maintain the pH at the optimal operating conditions. The addition of lime can also depress the flotation of minerals such as chalcopyrite, sphalerite, molybdenite, pyrite, pyrrhotite, and gold and other precious metals via the deposition of calcium on the metal surface

This paper investigates the role of non-toxic depressants on the flotation of pyrite. Starch and meta bisulphite were used as a depressant for pure pyrite sample and a

Keywords: Refractory Copper-pyrite Ores, Flotation, Tennantite, Arsenic, Recovery 1.Introduction The treatment processes for the beneficiation of copper-pyrite ores consisting of tennantite-tetrahedrite series minerals along with chalcopyrite, pyrite and sphalerite are generally complex. Tetrahedrite-tennantite minerals

Flotation of sulphidic and oxidic copper minerals is reviewed, with particular reference to previous studies of refractory copper ore flotation. Principle of

The copper flotation tailings are the feed to the sphalerite flotation circuit where the zinc minerals are floated as explained in the lead-zinc flotation section. Sphalerite is first activated with CuSO4 and floated typically at elevated pH for iron sulphide depression. Combinations of xanthate with either dithiophosphate and/or

Mar 18, 2021 As for the talc type Copper-Nickel Sulfide Ores, the talc entrained in flotation concentrate with foam will affect the grade of copper sulfide ore, so gum Arabic (GA) is a good depressant to

Nov 01, 2011 Mineral species such as talc, carbon and carbon associated minerals, such as carbonaceous pyrite, can all be difficult to depress in a flotation circuit. On the other hand, floating them off in a prefloat circuit before the rougher is an easier way to handle them

Pyrite, like a number of other sulfides, may be activated for more efficient flotation by interaction with dissolved heavy metals ions, e.g., Cu2+. Activation may be accomplished intentionally for the purpose of floating pyrite from other minerals, or it can occur inadvertently when the ore is

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

copper grade increase of about 22% in flotation copper ore through bacterial conditioning of pyrite surfaces resulting in pyrite depression. Key words: Chalcopyrite, bio-oxidation, bacteria, mineral surface, froth flotation. INTRODUCTION Acidothiobacillus ferrooxidans is an aerobic, acidophilic, rod-shaped, autotrophic, gram-negative bacterium

Sep 01, 2018 For the copper tailings, the objective of the flotation is to detach the copper minerals from other sulfide minerals (usually pyrite) and the gangue minerals. The main difficulty lies in the depression of pyrite, which conventionally proceeds in high pH conditions by using large amounts of lime (CaO)

Test results indicated the copper grade increase of about 22% in flotation copper ore through bacterial conditioning of pyrite surfaces resulting in pyrite depression. View Show abstract

Remember that only 0.67% of the ore is copper. The copper minerals and waste rock are separated at the mill using froth flotation. The copper ore slurry from the grinding mills is mixed with milk of lime (simply water and ground-up limestone) to give a basic pH, pine oil (yes, it comes from trees -- a by-product of paper mills) to make bubbles

1. Method of flotation of copper-zinc-pyrite ore, including grinding in an alkaline medium, air conditioning with reagents - collectors and frothers, collective copper-zinc flotation to produce collective concentrate containing copper minerals and natural-activated sphalerite, and tails, characterized in that as the collector used is supplied in the following sequence composition

Recovery of copper is by standard flotation reagents identified in the copper ore flotation description. Molybdenum will float naturally with the copper but can be crowded in the froth by the copper mineralization and use of a moly collector (such as diesel oil, kerosene, refined oils, pine oil or xanthate ester) enhances its floatability

impact of pyrite on copper flotation. [27–30] It has been ... than 11 are essential to extensively depress pyrite in the presence of xanthate collectors. ... mineral in the ore. According to the

Effective flotation collector reagent selection is dependent on the sulphide minerals present, their mineral associations in the ore, and circuit characteristics. Because an ore typically has more than one copper sulphide mineral type, often a combination of sulphide flotation collectors is used to maximize metallurgical performance

Role of starch and metabisulphite on pure pyrite and pyritic copper ore flotation 43 occurred with 1.7 mg/ dm3, while 21% depression occurred with the same dosages of starch at pH 6.5 where pyrite flotation is expected to be weak at pH 10

Oct 08, 2015 Pyrite Depression in Copper Flotation. The Pyrite Depression in a Copper Only Flotation circuit is simple enough. If your froth flotation system only tries to recover chalcopyrite-copper, you need to bring the plant’s pH up to the other side (right side) of the PYRITE curve. The more flotation collector you have on, the higher you will need to increase

pH plays a major role in process. Before changing parameters confirm from lab tests different pH Vs Recovery and grade and then fix the parameters. In plant practice actual pH will be very nearer to it. Even high pH depress copper. Keep minimum pH and try NaCN. Even at low pH NaCN depress pyrite. You try 1st in lab and then try in plant

I experienced a copper-gold massive ore type where thionocarbamate seemed to work better. Also, SMBS is a common pyrite depressant. Dithionocarbamates are very selective in copper flotation. It will not float pyrite. Can be used at a slightly elevated pH (9). It is a common approach in copper flotation

In response to the high pyrite recovery in copper flotation using seawater, this study investigated the role of sodium metabisulphite (MBS), a widely used pyrite depressant, in depressing the

May 16, 2016 When pyrite is present, lime performs the additional function of a depressor, the amount used being balanced against that of the promoter—that is, no more lime should be added than is required to prevent the bulk of the pyrite from floating, as any excess tends to depress the copper minerals, and no more of the promoter should be employed than is needed to

Apr 14, 2016 BALL MILL GRINDING. Grinding the washed rod mill discharge to approximately 90% minus 200 mesh was necessary to get fairly good liberation of the copper and zinc from the bulk of the pyrite. Lime was added to the ball mill to give a

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 concentrate should be considered