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  • Effect of grinding media on the activation of pyrite ...

    01/07/2010  Grinding media affects pyrite activation by Cu 2+ in a different pattern. Although mild steel medium produced a higher amount of iron oxidation species than 30% chromium medium, a higher pyrite recovery was observed with mild steel medium in the presence of Cu 2+. This phenomenon may also be explained by the electrostatic interaction between copper-activated pyrite and iron hydroxide. EDTA ...

  • Cited by: 57
  • Effect of grinding media on the activation of pyrite flotation

    However, adsorption of lead hydroxide on pyrite surface is principally responsible for the activation of pyrite flotation by Pb(2+). The effect of grinding media on the flotation of pyrite activated by Cu(2+) or Pb(2+) is through the change of pulp potential and iron oxidation species emanating from the media. The iron oxidation species from grinding media is electrostatically repulsive with ...

  • Cited by: 57
  • Effect of grinding media on the activation of pyrite ...

    The effect of grinding media on the flotation of pyrite activated by Cu 2+ or Pb 2+ is through the change of pulp potential and iron oxidation species emanating from the media. The iron oxidation species from grinding media is electrostatically repulsive with respect to copper-activated pyrite and therefore, reducing conditions produced by mild steel medium promotes pyrite flotation in the ...

  • Cited by: 57
  • Galvanic interaction of grinding media with pyrite and its ...

    The copper activation of pyrite during regrinding was also studied. It was found, that the mild steel grinding media is more beneficial to copper activation than stainless steel media ...

  • Review of the effect of grinding media on flotation of ...

    TABLE 4 The Effect of Grinding Media on the Flotation of Pyrite Without Activation With Copper Sulphate Tests showing that mild steel yielded inferior flotation of pyrite vs stainless/autogenous media: testwork scale ore location source (reference) Bench Bench Bench Canada South Africa Canada Thornton, [37] Finkelstein, [48] Rao, Moon Leja, [49]

  • INFLUENCE OF PYRITE CONTENT ON THE FLOTATION OF ...

    Copper activation of pyrite increases collector adsorption onto pyrite surface, promoting its flotation which subsequently lowers the overall chalcopyrite recovery and grade (Xu et al., 1995; Peng et al., 2003). For improved mineral liberation due to changes in ore mineralogy in order to increase flotation recovery and grade of the final concentrate (Gaudin, 1939; Sutherland 1989), regrinding ...

  • (PDF) Electrochemical properties of pyrite, pyrrhotite ...

    Metal sulphides are usually semiconductor and their electrical conductivity is low; therefore they are sources of electrons and promote electrochemical reactions. This phenomenon is of significant importance in sulphide flotation. The formation of a

  • EFFECT OF REGRINDING CONDITIONS ON THE REJECTION

    The copper activation of pyrite during regrinding was also studied. It was found, that the mild steel grinding media is more beneficial to copper activation than stainless steel media ...

  • Interaction of copper(II) ions with pyrite and its ...

    K Laajalehto, J Leppinen, I Kartio, T Laiho, XPS and FTIR study of the influence of electrode potential on activation of pyrite by copper or lead, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/S0927-7757(98)00897-8, 154, 1-2, (193-199), (1999).

  • Pyrite Oxidation Mechanism by Oxygen in Aqueous Medium

    08/11/2015  Pyrite Oxidation Mechanism by Oxygen in Aqueous Medium Egon Campos Dos Santos, Juliana Cecília de Mendonça Silva, and He ́lio Anderson Duarte * GPQIT, Departamento de Química, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte − MG, Brazil, 31.270−901 * S Supporting Information ABSTRACT: The mechanism of the initial steps of pyrite (100) surface oxidation was

  • Interaction of copper(II) ions with pyrite and its ...

    K Laajalehto, J Leppinen, I Kartio, T Laiho, XPS and FTIR study of the influence of electrode potential on activation of pyrite by copper or lead, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/S0927-7757(98)00897-8, 154, 1-2, (193-199), (1999).

  • (PDF) Electrochemical properties of pyrite, pyrrhotite ...

    Metal sulphides are usually semiconductor and their electrical conductivity is low; therefore they are sources of electrons and promote electrochemical reactions. This phenomenon is of significant importance in sulphide flotation. The formation of a

  • Surface chemistry of activation of lime-depressed pyrite ...

    The results for activation flotation of pyrite are very well explained using the activation index. Oxalic acid which exhibited the greatest activation index can be substituted for sulfuric acid ...

  • Influence of the Interaction between Sphalerite and Pyrite ...

    During pyrite activation, metal ions are precipitated or adsorbed on the mineral surface to create suitable sites for the adsorption of the collector [10,11]. In the selective flotation of sphalerite, the undesired activation of pyrite will reduce the difference in flotation performance between sphalerite and pyrite, and cause a decrease in the recovery and grade of Zn concentrates. However, a ...

  • Impact of mechanical activation and mechanochemical ...

    01/03/2015  Mechanochemical activation can be more effectual than mechanical activation. • Pyrite Fe extraction in 1 M H 2 SO 4 leaching at ambient temperature was 87.2% by MCA. • MCA increase amorphization degree of pyrite to 83% after 50 min intensive milling. Abstract. In this paper, a new pretreatment method was employed for the enhancement of pyrite mineral dissolution by using

  • Influence of the Interaction between Sphalerite and Pyrite ...

    In this paper, the effect of pyrite on the activation of sphalerite was investigated by micro-flotation, copper adsorption experiments, X-ray photoelectron spectroscopy (XPS), and electrochemical measurement. The micro-flotation test results showed that the recovery and flotation rate of sphalerite with copper sulphate as activator and butyl xanthate as collector were significantly decreased ...

  • Effects of Persulfate Activation with Pyrite and Zero ...

    DMP concentration was found at about 60.0% and 53.0% with zero-valent iron (ZVI) and pyrite activation of persulfate, respectively. DBP concentration was measured as 25.0–17.2% and 23.2–16.0% using ZVI–persulfate and pyrite–persulfate systems, respectively. However, DEHP was not detected. The total organic carbon concentration lagged behind the Ʃ3 PAEs. Persulfate consumption with ZVI ...

  • (PDF) Pyrite and pyrrhotite open circuit potentials study ...

    In this research, effects of chloride sulfate ions and pH changes on the open circuit potentials of pyrite, pyrrhotite and steel and also their reduction–oxidation processes were studied. These potentials were measured at different pH values in

  • Learn the Pyrite Use for Wealth and Abundance - Energy

    The pyrite use for wealth and abundance combines the principles of Feng Shui with the energy of the gold pyrite. Pyrite was dubbed fool’s gold for its striking resemblance to good. For centuries, pyrite has been viewed as a symbol for money and good luck. Raw pyrite use works to foster the energy of wealth and abundance. First, its energy is ...

  • Pyrite – Firmware Security

    With the support for Pyrite, AMI enables drives that have a hardware mechanism to protect access without the need to carry out encryption of user data. AMI has worked with several industry partners to develop and validate the support for Pyrite. By introducing this support, OEMs can create solutions at lower costs than Opal or Opalite while maintaining the security of the data.[]

  • Effects of Persulfate Activation with Pyrite and Zero ...

    DMP concentration was found at about 60.0% and 53.0% with zero-valent iron (ZVI) and pyrite activation of persulfate, respectively. DBP concentration was measured as 25.0–17.2% and 23.2–16.0% using ZVI–persulfate and pyrite–persulfate systems, respectively. However, DEHP was not detected. The total organic carbon concentration lagged behind the Ʃ3 PAEs. Persulfate consumption with ZVI ...

  • Effect of grinding media on the activation of pyrite ...

    Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): hdl.handle.net/2440/686... (external link)

  • (PDF) Pyrite and pyrrhotite open circuit potentials study ...

    In this research, effects of chloride sulfate ions and pH changes on the open circuit potentials of pyrite, pyrrhotite and steel and also their reduction–oxidation processes were studied. These potentials were measured at different pH values in

  • Influence of the Interaction between Sphalerite and Pyrite ...

    In this paper, the effect of pyrite on the activation of sphalerite was investigated by micro-flotation, copper adsorption experiments, X-ray photoelectron spectroscopy (XPS), and electrochemical measurement. The micro-flotation test results showed that the recovery and flotation rate of sphalerite with copper sulphate as activator and butyl xanthate as collector were significantly decreased ...

  • 10.1016/j.mineng.2005.06.005 DeepDyve

    11/06/2020  Nomenclature α Py/MS surface area ratio of pyrite to mild steel α surface area rate of pyrite contacting with mild steel A MS and A Py surface area of mild steel and pyrite respectively, cm 2 A Py ( t ) surface area of pyrite and a function of the grinding time, cm 2 [ C aq ] concentration of the metal ion or sulphur analysed by ICP in the ...

  • Pyrite Resolution Board PYRITE REMEDIATION SCHEME

    1.2 The Pyrite Resolution Board is subject to the provisions of the Freedom of Information Acts 1997 and 2003 and the Data Protection Acts 1988 and 2003 1.3 The words and terms in this document have the same meaning as in the Pyrite Resolution Act 2013 unless otherwise indicated. 1.4 Any reference in this Scheme to the PRB can mean the Board itself or the staff assigned to it. 2.0 Overview of ...

  • (PDF) Control of grinding conditions in the flotation of ...

    Control of grinding conditions in the flotation of chalcopyrite and its separation from pyrite

  • Electrochemical properties of pyrite, pyrrhotite, and ...

    pyrite and pyrrhotite from other sulphide minerals. Understanding of activation and depression of sulphide minerals, such as pyrite and pyrrhotite, as well as grinding media such as steel balls, under both acidic and alkaline conditions, is necessary to improve recovery and to design process strategies for cost reduction. These parameters can be determined through studies of electrochemical ...

  • Pyrite Oxidation Mechanism by Oxygen in Aqueous

    Pyrite oxidn. kinetics are limited by the rate of reaction at the pyrite surface, with an activation energy of 33.2 kJ/mol with respect to dissolved oxygen concn., or 41.7 kJ/mol with respect to oxygen partial pressure at 170-230°. The reaction order with respect to oxygen partial pressure was 0.5 at 210°, and indicated the first charge transfers of both the anodic and cathodic half-cell ...

  • Pyrite – Firmware Security

    With the support for Pyrite, AMI enables drives that have a hardware mechanism to protect access without the need to carry out encryption of user data. AMI has worked with several industry partners to develop and validate the support for Pyrite. By introducing this support, OEMs can create solutions at lower costs than Opal or Opalite while maintaining the security of the data.[]

  • Pyrite Oxidation Mechanism by Oxygen in Aqueous

    Pyrite oxidn. kinetics are limited by the rate of reaction at the pyrite surface, with an activation energy of 33.2 kJ/mol with respect to dissolved oxygen concn., or 41.7 kJ/mol with respect to oxygen partial pressure at 170-230°. The reaction order with respect to oxygen partial pressure was 0.5 at 210°, and indicated the first charge transfers of both the anodic and cathodic half-cell ...

  • Division of Sustainable Process Engineering Sulphide ...

    It was found that pyrite (FeS 2), chalcopyrite (CuFeS 2), sphalerite ((Zn,Fe)S), and galena (PbS), which are the most abundant sulphide minerals on Earth, generated H 2O 2 in pulp liquid during wet grinding in the presence or devoid of dissolved oxygen in water and also when the freshly ground solids are placed in water immediately after dry grinding. Pyrite generated more H 2O 2 than other ...

  • Minerals Free Full-Text Zeta Potential of Pyrite ...

    The effect of ions such as Cu 2+, Fe 2+, and Ca 2+ on the floatability of pyrite has been studied extensively [20,21,22,23]; in particular, the activation that these ions impart in pyrite increases the adsorption of xanthate and ultimately the recovery of pyrite within the pH range 6–10. The effect of the number of seawater ions, however, presents a new scenario that probably requires ...

  • The kinetics of the dissolution of chalcopyrite in ...

    The rates of dissolution are approximately constant for up to 80% dissolution for sized fractions of the concentrates with an activation of energy of about 75 kJ mole-1. Chalcopyrite from different sources appears to dissolve at approximately the same rate which is largely independent of the iron and copper ion concentrations, the acidity and chloride ion concentration but depends in some ...

  • Surface Oxidation of Pyrite as a Function of pH ...

    Pyrite, the most abundant metal sulfide at the surface of Earth, plays a key role in many processes such as acid mine drainage, redox cycling of metals at oxic-anoxic boundaries of lake bottom, and degradation of pollutants. The oxidation of pyrite was studied in batch experiments over a large range of pH (2.5−12), with trace oxygen. Surface analysis of the samples was performed using X-ray ...

  • A study on the effect of active pyrite on flotation of ...

    the amount of pyrite by using the mild steel media during regrinding conditions. 10 The effects of diethylenetriamine (DETA) in different situations (under aerated and non- aerated) on Cu-activated pyrite hydrophobised by xanthate were assessed (Agorhom et al., 2014). Diethylenetriamine (DETA) 2014 Due to the presence of DETA, the depression of pyrite increased due to the increase in oxidation ...

  • pyrite flotation - ocmd.co.za

    Pyrite depression in marmatite flotation by sodium glycerine-xanthate HE Ming-fei, QIN Wen-qing, LI Wei-zhong, ZENG Ke School of Resources Processing and ... Selective flotation of pyrite and gold tellurides . The separation of tellurides from pyrite can be carried out by selective flotation. The selection and dosage of collectors and pulp pH are very important to pro . CHAPTER 3 COMPARISON OF ...

  • Pyrite Activation in Amyl Xanthate Flotation With

    Media Releases Policy Submissions Conference News AusIMM News Professional Workforce Survey ... Experimental results show that activation of pyrite in such cyanide solutions can be achieved more effectively with lead than with copper. Subsequently, based on these fundamental studies, significant improvement at the Lone Tree Plant was achieved by lead activation, in which case the recovery ...

  • The Adsorption of Cu Species onto Pyrite Surface and Its ...

    The activation of pyrite is achieved by the formation of CuS-like species on pyrite surface, which improves the surface hydrophobicity of pyrite. Weisener has suggested that activation of pyrite with CuSO 4 follows a single fast step involving Cu(II) adsorption onto the reactive sulfur sites only on the surface with no migration into the bulk pyrite [8, 9]. In some ore-processing plants, the ...

  • Technical Note Pyrite oxidation by hydrogen peroxide in ...

    In general and according to the results in Fig. 3 and Table 1 the oxidative dissolution of pyrite by hydrogen peroxide in acidic media is characterized by the fact that rate of oxidation increases with temperature. The quantitative expression of the temperature influence can be obtained by the Arrhenius relation represented in Fig. 4 for the applied 0.1mol/l initial concentration of hydrogen ...