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Pyrrhotite flotation

  • COMPARISON OF DIFFERENT PYRRHOTITE DEPRESSANTS IN

    Nickel producers have been using a number of different strategies, sometimes in combination, to reject pyrrhotite. These include raising the pH of flotation to partially suppress pyrrhotite floatability (73), introducing separate pyrrhotite rejection circuits which by and large also exploit the fact that pyrrhotite floats poorly in alkaline solutions, and using magnetic separation to remove

  • The Effect of Conditioning on the Flotation of Pyrrhotite

    The influence of conditioning on the flotation of pyrrhotite in the presence of chlorite was investigated through flotation tests, sedimentation tests, and X-ray photoelectron spectroscopy (XPS) analysis. The flotation results show that chlorite slimes dramatically impair the flotation of pyrrhotite. Sedimentation and flotation tests reveal that conditioning can effectively remove chlorite

  • FUNDAMENTAL STUDIES OF THE ELECTROCHEMICAL AND

    conditioning of oxidised pyrrhotite resulted in improved flotation response of pyrrhotite with the aid of copper activation and higher air flow rate. Keywords: Pyrrhotite, PGE, electron microprobe analysis, rest potential, polarisation resistance, anodic polarisation diagrams, cathodic polarisation diagrams, capacitance, ethyl

  • (PDF) Pyrrhotite flotation and its selectivity against

    Pyrrhotite flotation and its selectivity against pentlandite in the beneficiation of nickeliferous ores: An electrochemistry perspective May 2014 Minerals and Metallurgical Processing 31(2):115-125

  • A review of pyrrhotite flotation chemistry in the

    Jul 01, 2005· In many flotation plants, pyrrhotite is rejected to the flotation tailings as a waste product such as in the case of CuNi ores and massive nickel ores (Fornasiero et al., 1995, Bozkurt et al., 1998, Chanturiya et al., in press, Khan and Kelebek, 2004). However, a strong interest in pyrrhotite recovery arises in certain instances.

  • A review of pyrrhotite flotation chemistry in the

    The chemistry of pyrrhotite flotation using xanthate collectors is reviewed with respect to the processing of PGM ores and the recent results from captive bubble contact angle measurements at the University of Utah are presented. In some cases a low flotation recovery of PGM may be due to the surface state of pyrrhotite particles under conventional flotation conditions (open to air and pH 9.0

  • Flotation of chalcopyrite, pentlandite, pyrrhotite ores

    Nov 01, 1991· The flotation rate of pyrrhotite is relatively slow when sodium carbonate is used so the rejection of pyrrhotite is enhanced in com- parison with a flotation system that uses lime as the base. Shebandowan also uses sodium carbonate as the base but also recycles most of

  • Copper-Cobalt ores

    The tails produced in the first differential flotation step is followed by a pyrite and pyrrhotite flotation stage using xanthate and MBT, leaving the cobalt minerals in the flotation cell tails. The cobalt minerals are then floated by using sulphuric acid to decrease the

  • A review of the physicochemical properties and flotation

    Dec 05, 2017· Pyrrhotite is one of the most abundant sulphide gangue minerals in base metal mining operations. It has little economic value and is a significant contributor of SO 2 emissions at the smelting stage, thus it is rejected in most concentrators, requiring a concerted effort to ensure it is well separated from valuable minerals. The mineral processing of pyrrhotite is generally understood, however

  • A review of the physicochemical properties and flotation

    Pyrrhotite is one of the most abundant sulphide gangue minerals in base metal mining operations. It has little economic value and is a significant contributor of SO 2 emissions at the smelting stage, thus it is rejected in most concentrators, requiring a concerted effort to ensure it is well separated from valuable minerals. The mineral processing of pyrrhotite is generally understood, however

  • (PDF) Electrochemical properties of pyrite, pyrrhotite

    Electrochemical properties of pyrite, pyrrhotite, and steel: Effects on grinding and flotation processes December 2012 Journal- South African Institute of Mining and Metallurgy 112(10):883-890

  • Method of pyrrhotite-bearing ores flotation

    Activator flotation of pyrrhotite is the presence in the slurry of copper ions [1]. Known ability of pyrrhotite intensively to absorb oxygen from the liquid phase of the pulp caused by the oxidation of the surface of the mineral, as well as to the formation of sludge during grinding.

  • The Effect of Oxidation on the Flotation Behaviour of

    pyrrhotite recovery nearly triples after about a two-fold increase in retention time (secondary rougher stage). After this stage, pH is lowered to about pH 8 by sulphuric acid addition. This is followed by copper sulphate addition to facilitate the activation and flotation of remaining pyrrhotite and other sulphides. As

  • Adsorption of Amyl Xanthate at Pyrrhotite in the Presence

    Jul 18, 2013· Adsorption of xanthate at pyrrhotite with air and nitrogen, and the effects of cationic species have been investigated. The results have been correlated with flotation of pyrrhotite with air and nitrogen. While the use of nitrogen in place of air causes depression of pyrrhotite the effect is significantly reduced in presence of cationic species.

  • (PDF) The effect of nC12-trithiocarbonate on pyrrhotite

    Furthermore, since pyrrhotite flotation is pH-dependent, it will be useful for future experimenters to study the effect of pH using the methodologies in this paper and to determine if the correlations identified here are transferrable. The application of nC 12 -TTC with mild steel grinding media to improve the flotation activity of xanthate and

  • (PDF) The mineralogy of pyrrhotite from Sudbury CCN and

    The mineralogy of pyrrhotite from the Sudbury CCN and Phoenix nickel ores and its effect on flotation performance Megan Becker (i), Dee Bradshaw (ii) and Johan de Villiers (iii) (i) Centre for Minerals Research, University of Cape Town, South Africa (ii) Julius Krutschnitt Mineral Research Centre, University of Queensland, Australia (iii) Department of Materials Science & Metallurgical

  • The problem with pyrrhotite - International Mining

    Sep 04, 2017· XPS is an industry leader in understanding and minimizing the effect of pyrrhotite on metallurgical performance. Ore minerals in base metal sulphide deposits are often mixed with sulphide gangue which must be removed by flotation in order to produce a saleable concentrate.

  • Flotation performances of polymorphic pyrrhotite

    Jan 05, 2012· The floatability of different crystalline structures of pyrrhotite (monoclinic and hexagonal) was studied. It is shown that the floatability of monoclinic and hexagonal has obvious difference, and that the flotation recovery of monoclinic pyrrhotite is larger than that of hexagonal pyrrhotite using different collectors. When butyl dithiophosphate is used as the collector, the recovery is

  • "The Effect of Conditioning on the Flotation of Pyrrhotite

    The influence of conditioning on the flotation of pyrrhotite in the presence of chlorite was investigated through flotation tests, sedimentation tests, and X-ray photoelectron spectroscopy (XPS) analysis. The flotation results show that chlorite slimes dramatically impair the flotation of pyrrhotite. Sedimentation and flotation tests reveal that conditioning can effectively remove chlorite

  • Pyrrhotite Depressant in Polymetallic Flotation - Froth

    To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Flotation. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to comment on someone elses

  • Flotation Collectors - Mineral Processing & Metallurgy

    Aug 10, 2015· Flotation relies on differences in surface properties of different minerals to achieve separation. The study of these surface properties is known as surface chemistry. In flotation, it is necessary to understand the surface properties of minerals. Most importantly, surfaces can be either hydrophilic (water loving), or hydrophobic (water fearing).

  • Differential Flotation of Chalcopyrite, Pentlandite and

    Jul 18, 2013· (1996). Differential Flotation of Chalcopyrite, Pentlandite and Pyrrhotite in NiCu Sulphide Ores. Canadian Metallurgical Quarterly: Vol. 35, No. 4, pp. 329-336.

  • Pyrrhotite - an overview ScienceDirect Topics

    Monoclinic pyrrhotite, however, in contrast to hexagonal pyrrhotite, is magnetic and is recovered in magnetic concentrates. Previous research (Cline and Rosas, 1975; Iwasaki, 1999) has shown that flotation can be used to remove pyrrhotite. The Marcona Mine in Peru uses a reverse flotation process to float pyrrhotite from the magnetite.

  • NICKEL AND COBALT ORES: FLOTATION

    Figure 5 Flotation selectivity in the separation of pentlandite from pyrrhotite using sulfur dioxide and diethylenetriamine with sodium isobutyl xanthate (pH+9.2, 25 g t 1 Dow froth!250). (Reprinted with permissionfrom the CanadianInstitute of Mining, Metallurgy and Petroleum.) Figure 6 Flotation results obtained with Clarabelle ore from

  • Flotation recoverybysize comparison of pyrrhotite

    Jan 01, 2019· Hexagonal pyrrhotite follows conventional flotation recovery by particle size (highest in intermediate fractions; 10100 μm) while monoclinic pyrrhotite is mainly recovered in the finest fractions (<10 μm) where entrainment effects have been mitigated (Lawson et al., 2014, Multani and Waters, 2017). This trend has been observed in many

  • CHAPTER 3 COMPARISON OF DIFFERENT PYRRHOTITE

    pyrrhotite collectorless flotation, it is difficult to achieve a clean separation between pentlandite and pyrrhotite. Pyrrhotite rejections has been a long-standing problem in the nickel industry. Nickel producers have been using a number of different strategies, sometimes in

  • (PDF) A comparison of pyrrhotite rejection and passivation

    The non-stoichiometric sulfide mineral pyrrhotite (Fe1-xS) occurs almost ubiquitously inter-grown with the principal nickel mineral, pentlandite ((Fe,Ni)9S8). During Ni processing, pyrrhotite is generally rejected to the tailings stream by flotation

  • Effect of chlorite on the flotation of pyrrhotite and its

    Oct 18, 2018· (2019). Effect of chlorite on the flotation of pyrrhotite and its implications for elimination by different methods. Separation Science and Technology: Vol. 54, No. 8, pp. 1411-1419.

  • (PDF) Electrochemical properties of pyrite, pyrrhotite

    Flotation. Furstenau, pyrrhotite or steel, pyrite act as the cathode, and in galvanic M.C. (ed.). A.M. Gaudin Memorial Volume. SME-AIME, 1976. contacts between pyrrhotite and steel, pyrrhotite takes the pp. 509527. role of cathode. While the surfaces of cathodes are passivated 12.

  • An investigation into the flotation behaviour of pyrrhotite

    The flotation process normally adds copper sulfate as an activator which could accelerate the flotation rate of pyrrhotite. The flotation is conducted at the natural pH of the milled ore which may

  • A Comparative Study of Kinetics of Flotation of a Copper

    The differential flotation between pentlandite and pyrrhotite of HCNPHA was compared by repeating the experiments with potassium amyl xanthate (PAX). However, the pH for the flotation was 9.0 and 9.5, respectively, for using HCNPHA or PAX as collector. Time-recovery plots were fit using the modified first

  • Flotation of pyrrhotite to produce magnetite concentrates

    Sep 01, 2013· For pyrrhotite flotation in the presence of air and oxygen the critical pH is between 4.5 and 4.65 (Chang et al., 1954). Slurry consisting of pyrrhotite and water tends to reach an equilibrium pH of approximately 4.5 (Chang et al., 1954) which is similar to the critical pH.

  • Some aspects of the electrochemistry of the flotation of

    The iron sulfide mineral, pyrrhotite (Fe(1-x)S), has long been known to be more difficult to recover by flotation from alkaline slurries than many other base metal sulfide minerals. This paper summarizes the results of an electrochemical study of the surface reactions that occur during the flotation of nickeliferous pyrrhotite in the recovery of nickel and the platinum group metals.

  • The Effect of Oxidation on the Flotation Behaviour of

    pyrrhotite recovery nearly triples after about a two-fold increase in retention time (secondary rougher stage). After this stage, pH is lowered to about pH 8 by sulphuric acid addition. This is followed by copper sulphate addition to facilitate the activation and flotation of remaining pyrrhotite and other sulphides. As

  • (PDF) A review of pyrrhotite flotation chemistry in the

    Specifically, the importance of pyrrhotite flotation is evident in the processing PGM ores from the Bushveld Complex in South Africa.The Bushveld complex is the worldÕs largest source of platinum group minerals (PGMÕs).

  • Chapter 1 INTRODUCTION - repository.up.ac.za

    Pyrrhotite flotation performance is measured using carefully controlled microflotation experiments. Therefore, aspects relating to the breakage such as the comminution method, particle size distribution and liberation characteristics of both valuable and gangue minerals will not be focussed upon. However, the liberation of pyrrhotite will be

  • Electrochemical properties of pyrite, pyrrhotite, and

    flotation circuits, and the application of this information in the field of electrochemistry15. One of the most important separation stages in flotation circuits is the separation of pyrite and pyrrhotite from other sulphide minerals. Understanding of activation and depression of sulphide minerals, such as pyrite

  • Eilectrochemical Investigations into the Flotation

    Jul 18, 2013· (1989). Eilectrochemical Investigations into the Flotation Chemistry of Pentlandite and Pyrrhotite: Process Water and Xanthate Interactions. Canadian Metallurgical Quarterly: Vol.

  • Flotation performances of polymorphic pyrrhotite, Journal

    Jan 05, 2012· Flotation performances of polymorphic pyrrhotite Flotation performances of polymorphic pyrrhotite He, Ming-fei; Qin, Wen-qing; Li, Wei-zhong; Jiao, Fen 2012-01-05 00:00:00 The floatability of different crystalline structures of pyrrhotite (monoclinic and hexagonal) was studied. It is shown that the floatability of monoclinic and hexagonal has obvious difference, and that the flotation

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