Mechanochemical activation of chalcopyrite: Relationship between activation mechanism and leaching enhancement

Research output: Contribution to journalArticle

Abstract

This work addressed the mechanochemical activation of chalcopyrite by vertically stirred ball milling (VSBM) to enhance copper dissolution in leaching. Grinding with Zr balls and quartz sand as dispersing agent produced a significant increase of copper extraction from +10% to +40%, depending on grinding conditions. X-ray diffraction (XRD) and x-ray absorption fine structure (XAFS) results highlighted that the mechanochemical activation of chalcopyrite occurred through partial oxidation and rupture of crystal lattice. The contribution of each activation mechanism to leaching enhancement was assessed by two-stage leaching. The 10% increase of copper extraction in first stage leaching by H2SO4 confirmed the increase of soluble copper due to mechanochemical oxidation. Second stage leaching by H2SO4-Fe2(SO4)3 highlighted a larger dissolution of copper from chalcopyrite and enhanced kinetics upon activation. Whether grinding by VSBM or not, the kinetics of second stage leaching was found to be controlled by ions diffusion through the solid product layer. The partial amorphization of chalcopyrite resulted into additional increase of copper extraction ranging from +6 to +11% and produced a decrease of leaching activation energy from 91.0 to 79.4 kJ/mol.

Original languageEnglish
Pages (from-to)280-285
Number of pages6
JournalMinerals Engineering
Volume131
DOIs
Publication statusPublished - 2019 Jan 15

Fingerprint

chalcopyrite
Leaching
Chemical activation
leaching
Copper
copper
grinding
Ball milling
Dissolution
dissolution
oxidation
kinetics
Oxidation
Quartz
Kinetics
Amorphization
Crystal lattices
activation energy
rupture
Sand

Keywords

  • Activation
  • ANOVA
  • Chalcopyrite
  • Copper
  • Kinetics
  • Mechanochemistry

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Chemistry(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering

Cite this

@article{23b3effd089645bbab5737fbdd09d6a3,
title = "Mechanochemical activation of chalcopyrite: Relationship between activation mechanism and leaching enhancement",
abstract = "This work addressed the mechanochemical activation of chalcopyrite by vertically stirred ball milling (VSBM) to enhance copper dissolution in leaching. Grinding with Zr balls and quartz sand as dispersing agent produced a significant increase of copper extraction from +10{\%} to +40{\%}, depending on grinding conditions. X-ray diffraction (XRD) and x-ray absorption fine structure (XAFS) results highlighted that the mechanochemical activation of chalcopyrite occurred through partial oxidation and rupture of crystal lattice. The contribution of each activation mechanism to leaching enhancement was assessed by two-stage leaching. The 10{\%} increase of copper extraction in first stage leaching by H2SO4 confirmed the increase of soluble copper due to mechanochemical oxidation. Second stage leaching by H2SO4-Fe2(SO4)3 highlighted a larger dissolution of copper from chalcopyrite and enhanced kinetics upon activation. Whether grinding by VSBM or not, the kinetics of second stage leaching was found to be controlled by ions diffusion through the solid product layer. The partial amorphization of chalcopyrite resulted into additional increase of copper extraction ranging from +6 to +11{\%} and produced a decrease of leaching activation energy from 91.0 to 79.4 kJ/mol.",
keywords = "Activation, ANOVA, Chalcopyrite, Copper, Kinetics, Mechanochemistry",
author = "Giuseppe Granata and Kazumasa Takahashi and Tatsuya Kato and Chiharu Tokoro",
year = "2019",
month = "1",
day = "15",
doi = "10.1016/j.mineng.2018.11.027",
language = "English",
volume = "131",
pages = "280--285",
journal = "Minerals Engineering",
issn = "0892-6875",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Mechanochemical activation of chalcopyrite

T2 - Relationship between activation mechanism and leaching enhancement

AU - Granata, Giuseppe

AU - Takahashi, Kazumasa

AU - Kato, Tatsuya

AU - Tokoro, Chiharu

PY - 2019/1/15

Y1 - 2019/1/15

N2 - This work addressed the mechanochemical activation of chalcopyrite by vertically stirred ball milling (VSBM) to enhance copper dissolution in leaching. Grinding with Zr balls and quartz sand as dispersing agent produced a significant increase of copper extraction from +10% to +40%, depending on grinding conditions. X-ray diffraction (XRD) and x-ray absorption fine structure (XAFS) results highlighted that the mechanochemical activation of chalcopyrite occurred through partial oxidation and rupture of crystal lattice. The contribution of each activation mechanism to leaching enhancement was assessed by two-stage leaching. The 10% increase of copper extraction in first stage leaching by H2SO4 confirmed the increase of soluble copper due to mechanochemical oxidation. Second stage leaching by H2SO4-Fe2(SO4)3 highlighted a larger dissolution of copper from chalcopyrite and enhanced kinetics upon activation. Whether grinding by VSBM or not, the kinetics of second stage leaching was found to be controlled by ions diffusion through the solid product layer. The partial amorphization of chalcopyrite resulted into additional increase of copper extraction ranging from +6 to +11% and produced a decrease of leaching activation energy from 91.0 to 79.4 kJ/mol.

AB - This work addressed the mechanochemical activation of chalcopyrite by vertically stirred ball milling (VSBM) to enhance copper dissolution in leaching. Grinding with Zr balls and quartz sand as dispersing agent produced a significant increase of copper extraction from +10% to +40%, depending on grinding conditions. X-ray diffraction (XRD) and x-ray absorption fine structure (XAFS) results highlighted that the mechanochemical activation of chalcopyrite occurred through partial oxidation and rupture of crystal lattice. The contribution of each activation mechanism to leaching enhancement was assessed by two-stage leaching. The 10% increase of copper extraction in first stage leaching by H2SO4 confirmed the increase of soluble copper due to mechanochemical oxidation. Second stage leaching by H2SO4-Fe2(SO4)3 highlighted a larger dissolution of copper from chalcopyrite and enhanced kinetics upon activation. Whether grinding by VSBM or not, the kinetics of second stage leaching was found to be controlled by ions diffusion through the solid product layer. The partial amorphization of chalcopyrite resulted into additional increase of copper extraction ranging from +6 to +11% and produced a decrease of leaching activation energy from 91.0 to 79.4 kJ/mol.

KW - Activation

KW - ANOVA

KW - Chalcopyrite

KW - Copper

KW - Kinetics

KW - Mechanochemistry

UR - http://www.scopus.com/inward/record.url?scp=85056784565&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85056784565&partnerID=8YFLogxK

U2 - 10.1016/j.mineng.2018.11.027

DO - 10.1016/j.mineng.2018.11.027

M3 - Article

VL - 131

SP - 280

EP - 285

JO - Minerals Engineering

JF - Minerals Engineering

SN - 0892-6875

ER -