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----- ABSTRACT A study of pyrite depression by reducing agents with potassium ethylxanthate as collector indicates that pyrite may be depressed effectively in the flotation of both lead and copper sulfide ores without the use of poisonous cyanide salts.
Pyrite Depression in Copper Flotation 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 …
Keywords: Flotation, Depression, Thermodynamic models, Pyrite, Zinc, Copper, Lime, Xanthenes. INTRODUCTION Flotation of copper or zinc sulphides by depression of the iron sulphides in selective flotation or in separation of bulk copper-pyrite or zinc-pyrite concentrates is realized as usual in alkaline environment created by lime
Flotation tests showed that the flotation chemistry and recovery of chalcopyrite are affected by the proportion of pyrite present. Both chalcopyrite flotation recovery and grade decreased with increasing pyrite content. XPS results confirm that copper activation of pyrite increases with increasing pyrite content, reflecting the
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 that pH for effective pyrite depression.
promotes the oxidation of copper on pyrite as copper hydroxide, but has no effect on sphalerite. This increase in the amount of oxidation products on the pyrite surface and, as a result, decrease in xanthate adsorption may explain the depression of the flotation of pyrite in the presence of sodium sulfite. q2001 Elsevier Science B.V.
In addition, selection of the suitable type pyrite on copper flotation, still its role in high pyritic copper and adequate dosage of the reagents is one of the important ore is highly required to be studied with regard to increasing factors with regard to flotation and depression of pyrite.
It was found that the biopolymers (DP-1775, DP-1777 and DP-1778), differing in composition, were able to depress the flotation of copper-activated pyrite. The depression was associated with the ...
The adsorption of Cu species onto pyrite surface and its effect on flotation were investigated by using microflotation tests, first-principle calculations, and XPS surface analysis. The results indicated that the flotation of pyrite appears to be activated with CuSO4 only at alkaline pH, while being depressed at acidic and neutral pH. The adsorption of copper ions on pyrite surface was pH ...
Depression of pyrite mineral with cyanide and ferrous/ferric salts 151 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 C, mg/l R, % Figure 1 - Floatability of pyrite in the solutionsof different concentrations of KBX collector The introduction of the depressants in the flotation system leads to the
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 chalcopyritecopper, you need to bring the plant's pH up to the other side (right side) of the PYRITE curve.
Additionally, conventional pyrite depressants such as sodium cyanide, sodium hydro sulfide and Nokes reagent are toxic, highly regulated, difficult to handle and present an overall costly alternative. Figure 1: Copper / Iron ratio for recovery in flotation test for 150g/t Pionera F-250
Pyrite is a significant gangue sulphide mineral in the Ok Tedi copper ore. Its presence in the flotation concentrate is not entirely desirable since it lowers the grade of the final copper concentrate. Lime depression of the pyrite has been practiced with some success. However, it has been observed that at the pH for pyrite...
Chapter 7. Depression of sphalerite with cyanide and zinc sulphate 102 Chapter 7. Depression of sphalerite with cyanide and zinc sulphate 7.1. Introduction Cyanide is the only depressant currently used at the Rosh Pinah Mine to depress sphalerite and pyrite in the lead flotation circuit. As explained in Chapter 2, cyanide
Selective depressants for mineral flotation processes. PIONERA's BioPolymers are versatile additives that increase returns for our customers. Application results in important savings with minimal Health, Safety or Environmental issues.
of carbonaceous pyrite in copper flotation, depression of lead in lead-copper bulk separation (Bulatovic, 2007) and depression of hematite and apatite in their reverse flotation against siliceous minerals (Lin and Burdick, 1988). Dextrin dosages of up to 1,400 g/Mg is reported.
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.
Further, hydrophilic functional groups of adsorbed biopolymers enhance the hydrophilicity of pyrite surface, which facilitates the depression of pyrite flotation. In the flotation of copper-activated pyrite, cuprous xanthate is the predominant hydrophobic entity enabling pyrite flotation.
Flotation of copper– gold ores For the bulk ﬂotation of copper minerals and gold from supergene copper ores, it is normal practice to add a xanthate as the primary collector and dithiophosphate as a secondary collector (Bulatovic, 1997). ... This excludes the addition of an activator such as copper sulfate. The depression of pyrite at high ...
Depression of pyrite in the flotation of copper Trove. In this case, the selective depression of pyrite flotation was attributed to the immobilisation of copper by xanthate at the chalcopyrite surface or its removal from solution, both mechanisms resulting in a reduced copper activation of pyrite.
Froth Flotation (Sulphide & Oxide) ... Copper activates not only sphalerite but also pyrite. Optimise copper sulphate doses. There are reagents that can partly replace copper sulphate (for example Nickel sulphate). ... Cyanide depression of pyrite is enhanced in alkaline pH. Milk of lime may be used to adjust the pH. Remember AM, Gaudin ...
Request PDF on ResearchGate | On Mar 1, 2015, Eric A. Agorhom and others published Post-regrind selective depression of pyrite in pyritic copper–gold flotation using aeration and diethylenetriamine
This flotation step is conducted at alkaline pH. In the case where galena is floated and the copper minerals are depressed, copper depression can be achieved by using sodium sulphide, hydrosulfite, lime, cyanide, zinc-cyanide and/or ferricyanide complexes. Selection of flotation reagents and frothers is an important, even critical, consideration.
• 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%.
Investigation of Flotation Parameters for Copper Recovery from Enargite and Chalcopyrite Mixed Ore Kazutoshi Haga+, William Tongamp and Atsushi Shibayama Faculty of Engineering and Resource Science, Akita University, Akita 010-8502, Japan
Widely diverse mechanisms exist for the action of a range of selective sulphide flotation depressants. Collector desorp- tion, leaching, competitive adsorption, formation of hydrophilic reaction-product coatings, action as reducing agents, and action as lattice-oxidizing agents are discussed. Detailed attention is focused on the latter two mechanisms.
regrinding and aeration on the separation of pyrite from gold in copper rougher flotation tailings (0.07% Cu, 0.61g/t Au, tail grades). An aeration stage was applied both at the head of copper flotation (copper rougher feed) and after regrinding of the copper rougher tailings, before gold/pyrite selective flotation.
Pyrite flotation could also be reduced with addition of xanthate during grinding. In this case, the selective depression of pyrite flotation was attributed to the immobilisation of copper by xanthate at the chalcopyrite surface or its removal from solution, both mechanisms resulting in a reduced copper activation of pyrite.
(3) One large copper producer in Utah was found to use cyanide to depress pyrite flotation, discharged to waters of the state, and was under the NPDES permit system. Officials of this company stated that there was no problem with cyanide in the discharges from the three mills the company operated.
metal extraction processes. Pyrite depression is usually reached at highly alkaline conditions An improved flotation test method and pyrite depression by an organic reagent during flotation in seawater by R.I. Jeldres*, D. Calisaya*, and L.A. Cisternas* *59,484 Flotation of copper-molybdenum sulphide ores in seawater entails critical