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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

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Front Chem Sci Eng    2013, Vol. 7 Issue (4) : 464-471    https://doi.org/10.1007/s11705-013-1356-z
RESEARCH ARTICLE
The effect of pH, solid content, water chemistry and ore mineralogy on the galvanic interactions between chalcopyrite and pyrite and steel balls
Asghar Azizi1(), Seid Ziaoddin Shafaei2, Mohammad Noaparast2, Mohammad Karamoozian1
1. Department of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood 36199-95161, Iran; 2. School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
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Abstract

The role of pH, solid content, water chemistry and ore mineralogy on the galvanic interactions between chalcopyrite and pyrite and low alloy steel balls were investigated in the grinding of Sarcheshmeh porphyry copper sulfide ore. All these factors strongly affect the galvanic current between the minerals and the steel during the grinding process. The galvanic current density decreased as the solution pH and percent solids increased. In addition, changing the water in the ball mill from tap to distilled water reduced the galvanic current between the minerals and the balls. Potentiodynamic polarization curves showed that pyrite and chalcopyrite demonstrated typical active-passive-transpassive anodic behavior in the grinding of copper ore. However, the nature of their transitions from the active to the passive state differed. This behavior was not seen in the grinding of pure minerals. In addition, an EDTA extraction technique was employed to quantify the amount of oxidized iron in the mill discharge. The amount of extractable iron was influenced by the same experimental factors and in the same way as the galvanic current.
Keywords steel ball      galvanic interaction      pyrite      chalcopyrite      polarization curves     
Corresponding Author(s): Azizi Asghar,Email:azizi.asghar22@yahoo.com   
Issue Date: 05 December 2013
 Cite this article:   
Asghar Azizi,Seid Ziaoddin Shafaei,Mohammad Noaparast, et al. The effect of pH, solid content, water chemistry and ore mineralogy on the galvanic interactions between chalcopyrite and pyrite and steel balls[J]. Front Chem Sci Eng, 2013, 7(4): 464-471.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1356-z
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I4/464
Sample typeChemical compositions /wt-%
CuFeMoSSiO2Al2O3CaO
Sarcheshmeh ore (A)0.744.340.0323.0555.0714.35-
Sarcheshmeh ore (B)0.904.520.0192.1050.9614.47-
Pure chalcopyrite31.6029.020.01531.174.84-0.26
Pure pyrite0.1544.880.06649.882.310.640.19
Tab.1  Chemical compositions of the Sarcheshmeh ore sample and the pure minerals (wt-%)
Chemical compositions /wt-%
ElementCSiSPMnCrMoCu
steel ball0.2490.1730.0240.0180.5860.0190.0020.012
Tab.2  Chemical compositions of the low alloy steel balls
Fig.1  Schematic plan of (a) the specially designed ball mill, and (b) photo of the setup
RunGrinding tests conditionsGalvanic current density /(μA·cm-2)Combination potentials (potential between the ball and pyrite) /mV
1Ore A, tap water, pH= 7-7.5, solid content= 35%107.17-345
2Ore B, tap water, pH= 7-7.5, solid content= 35%122.32-331
3Ore B, tap water, pH=10-10.5, solid content= 35%76.81-324
4Ore B, tap water, pH= 7-7.5, solid content= 55%51.89-318
5Ore B, distilled water, pH= 7-7.5, solid content= 35%54.85-321
6Pyrite, tap water, pH= 7-7.5, solid content= 35%166.67-237
Tab.3  The measured galvanic current densities and combination potentials (versus Ag/AgCl (3.0 M KCl)) of pyrite with low alloy steel balls under different experimental conditions
RunGrinding tests conditionsGalvanic current density /(μA·cm-2)Combination potentials (potential between the ball and chalcopyrite) /mV
1Ore A, tap water, pH= 7-7.5, solid content= 35%90.77-359
2Ore B, tap water, pH= 7-7.5, solid content= 35%108.67-342
3Ore B, tap water, pH= 10-10.5, solid content= 35%67.09-335
4Ore B, tap water, pH= 7-7.5, solid content= 55%46.52-325
5Ore B, distilled water, pH= 7-7.5, solid content= 35%47.7-331
6Chalcopyrite, tap water, pH= 7-7.5, solid content= 35%123.56-314
Tab.4  The measured galvanic current densities and combination potentials (versus Ag/AgCl (3.0 M KCl)) of chalcopyrite with low alloy steel balls under different experimental conditions
Fig.2  Polarization curves of pyrite, chalcopyrite and the steel balls during grinding of Sarcheshmeh ore (A) at pH= 7-7.5, percent solids= 35% with a sweep rate of 50 mV/s
Fig.3  Polarization curves of pyrite, chalcopyrite and steel balls during grinding of Sarcheshmeh ore (B) with a sweep rate of 50 mV/s at (a) pH= 7-7.5, percent solids= 35%, (b) pH= 10-10.5, percent solids= 35%, (c) pH= 7-7.5, percent solids= 55%, and (d) pH= 7-7.5, percent solids= 35% when distilled water was used in the ball mill
Fig.4  Polarization curves of pyrite, chalcopyrite and steel balls during grinding of pure minerals ((a) pyrite and (b) chalcopyrite) with steel balls at pH= 7-7.5, percent solids= 35% with a sweep rate of 50 mV/s
RunGrinding tests conditionsEDTA extractable Fe /%
1Ore A, tap water, pH= 7-7.5, solid content= 35%0.185
2Ore B, tap water, pH= 7-7.5, solid content= 350.227
3Ore B, tap water, pH= 10-10.5, solid content= 35%0.138
4Ore B, tap water, pH= 7-7.5, solid content= 55%0.111
5Ore B, distilled water, pH= 7-7.5, solid content= 35%0.138
Tab.5  EDTA extractable iron in the mill discharge under different experimental conditions for low alloy steel balls
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