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Strengthen Leaching Effect of Carlin-type Gold via High-voltage Pulsed Discharge Pretreatment

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  • Available online: 20 February 2020
  • High-voltage pulsed discharge (HVPD) pretreatment was applied to strengthen the leaching effect of Carlin-type gold ore containing arsenic in this work. The optimal results of pretreatment experiments was obtained at the operating conditions of spherical gap spacing 20 mm, pulse numbers 100, and input voltage 90 V. The leaching rate of gold were increased by 15.6% via HVPD pretreatment. The mass fraction of -0.5+0.35 mm and -0.35+0.1 mm were increased by 11.0% and 6.8% compared with untreated samples, respectively, and the Au grade of -0.1 mm was increased by 22.8%. However, the superiority of HVPD pretreatment would be weakened by prolonging grinding time. Scanning electron microscope (SEM) results indicated that the pretreated products presented in the state of melting and then condensation, accompanying by some pore formation. More micro-cracks were generated in the interface of ore and the original crack were expended via pulsed discharge pretreatment, with the contact area between leaching reagent and ore were enlarged, and the leaching reaction rate were enhanced and the leaching effect was strengthened.
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  • The authors were grateful for the funding provided by the National Science Foundation of China (Grant Nos. 51974063) and the Fundamental Research Funds for the Central Universities of China (No. N180104016).

     

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Strengthen Leaching Effect of Carlin-type Gold via High-voltage Pulsed Discharge Pretreatment

  • Corresponding author:

    Yong-hong Qin    E-mail: qyh_neu@163.com

  • 1) College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
  • 2) National-local Joint Engineering Research Center of High-efficient exploitation technology for Refractory Iron Ore Resources, Shenyang 110819, China

Abstract: High-voltage pulsed discharge (HVPD) pretreatment was applied to strengthen the leaching effect of Carlin-type gold ore containing arsenic in this work. The optimal results of pretreatment experiments was obtained at the operating conditions of spherical gap spacing 20 mm, pulse numbers 100, and input voltage 90 V. The leaching rate of gold were increased by 15.6% via HVPD pretreatment. The mass fraction of -0.5+0.35 mm and -0.35+0.1 mm were increased by 11.0% and 6.8% compared with untreated samples, respectively, and the Au grade of -0.1 mm was increased by 22.8%. However, the superiority of HVPD pretreatment would be weakened by prolonging grinding time. Scanning electron microscope (SEM) results indicated that the pretreated products presented in the state of melting and then condensation, accompanying by some pore formation. More micro-cracks were generated in the interface of ore and the original crack were expended via pulsed discharge pretreatment, with the contact area between leaching reagent and ore were enlarged, and the leaching reaction rate were enhanced and the leaching effect was strengthened.

Acknowledgements  The authors were grateful for the funding provided by the National Science Foundation of China (Grant Nos. 51974063) and the Fundamental Research Funds for the Central Universities of China (No. N180104016).
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