influence of pyrrhotite on the corrosive wear of grinding

influence of pyrrhotite on the corrosive wear of grinding

CORROSIVE AND ABRASIVE WEAR IN ORE GRINDING*

Fine grinding may be required for some coals to remove sulfur and ash or io prepare coal-water slurry. Fine grinding leads to increased ball wear, and its effect on the surface properties of the ground coal becomes of concern. Marked ball wear tests were performed to study the effects of oxygen, pH, the soluble species of coal, and the addition of pyrrhotite on ball wear.

(PDF) Corrosive and abrasive wear in ore grinding

To investigate the electrochemical characteristics of grinding media materials and minerals used in this study, electrodes of pyrrhotite, pyrite and mild steel were prepared by mounting the samples in lucite tubing of 0.625 cm I.D. with a 3M Scotch-Weld structural adhesive, so that about 0.16 cm² of their surfaces were exposed to the solution.

An Electrochemical Study of Pyrrhotite-Grinding Media ...

Wear, ^03(1985) 253 CORROSIVE AND ABRASIVE WEAR IN ORE GRINDING* I. IWASAKI, S. C. RIEMER and J. N. ORLICH Mineral Resources Research Center, University of Minnesota, Minneapolis, MN 55455 (U.S.A.) K. A. NATARAJAN Indian Institute of Science, Department of Metallurgy, Bangalore 560012 (India) (Received March 26, 1985; accepted May 9, 1985) Summary The relative significance of corrosive ...

Electrochemical Aspects of Grinding Media-Mineral ...

Good agreement was found when the corrosion currents measured by electrochemical methods were compared with the corrosion currents estimated from marked ball wear tests. The rates of passive film formation controlled the corrosion currents of the high-chromium-steel grinding balls in a mill.

Assessment of wear mechanisms in grinding media | SpringerLink

Influence of Pyrrhotite on the Corrosion of Mild Steel Article (PDF Available) in Corrosion -Houston Tx- · July 2017 with 355 Reads How we measure 'reads'

An investigation of the corrosive wear of steel balls in ...

Results indicate that abrasive wear plays a significant role in ore grinding in the absence of sulfides, and rheological properties of the ore slurry influenced such wear. The effect of oxygen on corrosive wear becomes increasingly felt in the presence of a sulfide mineral such as pyrrhotite.

Factors affecting wear in tumbling mills: Influence of ...

May 01, 1987· An extensive program of marked ball wear testing (MBWT), laboratory corrosion studies, and worn ball surface analyses has been used to gain insight about the role of corrosion in the overall wear process. In some environments, localized corrosion is observed; the actual wear mechanisms in such cases are pitting/spailing and abrasion. Factors affecting the occurrence of pitting include the ...

How to Reduce Steel Consumption in Grinding Mills

Therefore, the aims of this research were to investigate the grinding chemistry influence (slurry pH, solid percentage, water chemistry and gas purging) on corrosive wear of steel balls and to ...

Effect of coal on the corrosive wear of grinding media

Relative significance of corrosive and abrasive wear The foregoing observations have established that wet grinding in nitrogen atmosphere gives the best estimate of abrasive wear. It may be cautioned, how- ever, that pH and the state of dispersion of the pulp have marked influence on the magnitude of abrasive wear defined in this manner (Orlich ...

Effect of pyrite and pyrrhotite on the corrosive wear of ...

Ball mills are common grinding equipment in mineral processing industries. Ball wear results from three mechanisms namely impact, abrasion and corrosion. Of these, the corrosion mechanism is the least investigated, due to its chemical-electrochemical nature. Therefore, the aims of this research were to investigate the grinding chemistry influence (slurry pH, solid percentage, water chemistry ...

Surface Engineering for Corrosion and Wear Resistance | J ...

conducting the experiments output responses like MRR, Grinding time and Surface roughness was measured. Grinding time is the time taken in removal of metal by the rotating abrasive wheel at a defined feed and depth of cut to abrade or wear away. The grinding time values obtained after carrying out the experiments is given in the Table 2.

Aqueous Corrosion-Wear Interactions | Corrosion ...

Nature of Corrosive and Abrasive Wear of Chromium-Bearing Cast Iron Grinding Media Vathsala Rajagopal 1 Mineral Resources Research Center, 56 East River Road, University of Minnesota, Minneapolis, MN 55455.

Grinding Media Corrosion

(1987) Effect of pyrite and pyrrhotite on the corrosive wear of grinding media. Mining, Metallurgy & Exploration 4 :3, . Online publication date: 1-Aug-1987.

The Effect of Galvanic Interaction Between Martensite and ...

The ball wear increased in all cases, when the mill atmosphere was changed from nitrogen to oxygen. The wear increment was greater in the grinding of a quartzite-pyrite mixture (26%) than in the grinding of a quartzite-pyrrhotite or a quartzite-pyrrhotite-pyrite mixture (21% and 22%, respectively).

(PDF) An investigation of the corrosive wear of steel ...

The relative significance of corrosive and abrasive wear in ore grinding is discussed. Laboratory marked ball wear tests were carried out with magnetic taconite and quartzite under different ...

Effect of Grinding Media on Flotation Chemistry

This article describes the methods of wear measurements and a model of corrosive wear in mill atmospheres. It explains the polarization curves of pyrrhotite and high-carbon low-alloy steel in a quartzite slurry with examples. The surfaces of pyrrhotite in contact with mild steel or stainless steel affected by galvanic interaction are discussed.

Effect of Pyrite and Pyrrhotite on the Corrosive Wear of ...

RESEARCH AT MRRC Grinding media Eight different grinding ball alloys have been used in laboratory marked- ball tests with corrosive Cu-Ni sulfide ores [ 6 ], abrasive quartzite, taconite or molybdenite ores [7], and abrasive and corrosive quartzite-pyrrhotite ore combinations [ 8 ].

(PDF) Influence of Pyrrhotite on the Corrosion of Mild Steel

@article{osti_, title = {Simultaneous corrosion and abrasion measurements under grinding conditions}, author = {Kotlyar, D. and Pitt, C.H. and Wadsworth, M.E.}, abstractNote = {The contribution of corrosion to the abrasive-corrosive wear of high carbon low alloy steel (HCLA), commonly used for grinding balls, was evaluated in 15% quartz slurries.

A Study on the Corrosive and Abrasive Wear of Grinding ...

Corrosion wear appears to be responsible for 40-90% of the total steel loss. Several methods for reducing steel wear have been identified. Different parts of the world use different methods to reduce steel wear. The mill operator has to study his specific problem and …

Simultaneous corrosion and abrasion measurements under ...

Corrosive wear occurs when the component operates in a corrosive media, liquid or gas [1, 2]. In this type of wear, the tribochemical reaction between corrosive agent and the bulk material generates a reaction (protective) layer on the surface. During the sliding friction, this layer is removed and the tribochemical reaction is started again.

How to Reduce Steel Consumption in Grinding Mills

Wet grinding efficiency was found to be dependent on media hardness, while wear under wet grinding was much higher, in general, than that under dry grinding. With respect to mill size it was found that the smaller laboratory mills tended to overemphasise corrosive wear compared with …

Influence of Process Parameters of Surface Grinding on ...

grinding balls export. Influence of pyrrhotite on the corrosive wear of grinding balls in In the absence of sulfidebearing minerals such as pyrrhotite corrosive wear of the grinding balls in the wet grinding of magnetite ore was relatively small even. Get A …

Factors affecting wear in tumbling mills: Influence of ...

Freshly abraded metallic debris particles generated by abrasive wear of the grinding media lowered the corrosive wear of the media by affecting the electrochemical behavior of the minerals, particularly for a magnetic mineral such as pyrrhotite.

Corrosive and abrasive wear in ore grinding

The purpose of this study was to evaluate and rank the key factors affecting abrasive and corrosive wear of grinding media using fuzzy Delphi analytic hierarchy (FDAHP) method in grinding of copper sulphide minerals. There are many factors that affect the abrasive and corrosive wear of grinding media. Weight of each impact factor must be determined by using comprehensive scenario that is ...