The effects of carboxyl, sulfonate, hydroxyl or thiourea functional groups attached to the polymers on the flotation recoveries of sphalerite and pyrite were studied as a function of polymer concentration and order of reagent addition. It was found that all the PAMs depressed pyrite flotation with no or little depression of sphalerite.
USA US474491A USA USA US A US A US A US 474491 A US474491 A US 474491A US A US A US A US A US A US A Authority US United States Prior art keywords arsenopyrite pyrite flotation pyrrhotite permanganate Prior art date Legal status (The legal status is an assumption and .
The mineral pyrite (/ ˈ p aɪ r aɪ t /), or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS 2 (iron(II) disulfide). Pyrite is considered the most common of the sulfide minerals. Pyrite's metallic luster and pale brassyellow hue give it a superficial resemblance to gold, hence the wellknown nickname ...
Selective depression of pyrite using biopolymers in the flotation of copper sulphide minerals Y. Mu, Y. Peng (University of Queensland, Australia) and Lauten (Pionera, Norway) Effects of mono and divalent cations in seawater flotation
during preflotation significantly reduced the bulk flotation action and entrainment of sphalerite in the froth, (b) grinding the ore finer (P 80 = 40 µm) reduced the recovery of sphalerite as composite particles during lead flotation, and (c) the pulp pH was
Pyrite Flotation: A Review. Sulfide minerals are semiconductors, and pyrite is the major gangue mineral associated with these ores. Main interest in the processing of complex sulfide ores has focused on the rejection of pyrite and selectivity problem that arises owing to the similar electrochemical behavior of pyrite to the other sulfide minerals in...
Its flotation can also be enhanced by the activation of copper or lead ions emanating from other minerals. Depressants are generally required to selectively depress pyrite. In this article, a comprehensive review of the fundamental studies of depression mechanisms and effectiveness of commonly used reagent systems to depress pyrite is presented.
To understand the effect of these reagents on the depression of pyrite during coal flotation, both the surface chemistry and the rheology of coalpyrite systems must be studied. This paper summarizes the results of flotation tests at a 200 mesh of grind of Pittsburgh No. 8 .
Pyrite Depression (23 replies) Lead is floated at low pH. 8 or 9. In cleaner cells pH >9. Cyanide consumption will be less if pH is controlled using instruments and PLC. Pyrite floats at very low pH or gets entrapped during flotation. Column flotation will give good results for such problems.
Sulfide minerals are a major source of metals; however, certain sulfide minerals, such as pyrite and pyrrhotite, are less desirable. Froth flotation is a commonly used separation technique, which requires the use of several reagents to float and depress different sulfide minerals.
Chemistry Of Pyrite Flotation And Depression 2018 . The depression of pyrite flotation is normally difficult especially when pyrite is activated by copper ions. In this study, different biopolymers, 1600 Chemistry Flotation recovery of chalcocite and pyrite at pH as a function of potential for single mineral beds alone and in the presence ...
5) (MBS) at regrinding and cleaning stages to depress pyrite at pH around Hence, rougher circuit operating without or small amount of lime, and depression of pyrite in cleaning stages at low pH, are the key factors for the CuMoFe flotation technology in seawater. This scheme is
Depression of pyrite by using nitrogen throughout grinding and flotation proved difficult to control at the benchscale. As a consequence tests were conducted with nitrogen being introduced only at the flotation stage. This, unexpectedly, promoted pyrite flotation. It was this phenomenon which spurred the testwork described below.
In the industrial practice, pyrite is floated with xanthate as collector, whereas the commonest reagents for its depression in leadzinc ore flotation are of cyanide type. However, cyanides are not mainly in use for pyrite depression in copper ore flotation.
a collector for metal sulfide minerals. Previous research showed that for the flotation of pyrite, the ferric irons on the pyrite surface serve as the active sites for adsorbing xanthate molecules [16,18]. In this study, we first investigated the adsorption mechanism of konjac gum on pyrite and talc
It is the use of cyanide in the copper, lead, and zinc milling industries as a depressant for pyrite in the flotation of copper, lead, and zinc materials. Many of the collectors used in the flotation of these minerals also coat iron sulfide particles, with the result that they too float with the valuable minerals,...
Pyrite depression in marmatite flotation by sodium glycerinexanthate HE Mingfei, QIN Wenqing, LI Weizhong, ZENG Ke School of Resources Processing and Bioengineering, Central South .
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
Surface Chemical Studies on Pyrite in the Presence ... depression of pyrite encompass each other. XPS and FTIR spectro ... Flotation tests were carried out using a modified Hallimond tube (20). Potassium ethyl xanthate (PEX, 10¡3 M) was used as collector for the pyrite flotation. For the
depression of the flotation of pyrite than sphalerite. A further improvement in this separation was ... Their chemical analysis is reported in Table 1. Potassium ethyl Table 1 Chemical composition of sphalerite and pyrite samples Mineral Element Zn S Pb Fe Cu Sphalerite, ZnS Elmwood mine, Tennessee 510 ppmŽ. Ž.
Oxidation (aeration of the flotation pulp) of Cuactivated pyrite induced by xanthate before DETA addition has a greater effect on the surface chemistry of the pyrite particles and subsequently increased pyrite depression. The above condition decreased pyrite recovery drastically from 92% to 12%.
1989 (English) Doctoral thesis, comprehensive summary (Other academic) Abstract [en] Thermodynamic calculations, electrochemical techniques, flotation and adsorption tests were used to study the physicochemical principles involved in the flotation, activation and depression of the common ironcontaining sulphide minerals.
The depression of pyrite in selective flotation by different reagent systems Y. Mu, Y. Peng (University of Queensland, Australia) and Lauten (Pionera, Norway) The interaction of sodium mercaptobenzothiazole with gold electrode and nanorod
In this study, chitosan polymer was tested as a potential selective green depressant of pyrite in the bulk flotation of galena (PbS) and chalcopyrite (CuFeS2) from sphalerite (ZnS) and pyrite (FeS2) using sodium isopropyl xanthate as a collector and 4methyl2pentanol (MIBC) as a frother.
Flotation of pyrite is possible below pH 11 with short chain xanthates, but is depressed above about pH 11 Depression of Pyrite 1. Hydroxyl as depressant (OH) The hydroxyl ion functions a depressant for two reasons: With high hydroxyl activities, above pH 11, xanthate oxidation to dixanthogen does not occur.
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