Although oxygen pressure acid leaching is a promising methodology to extract valuable metals from complex chalcopyrite, there are some drawbacks like requiring a high reaction temperature, long leaching time and easy formation of hazardous solid waste (i.e., plumboferrite) in the leached residue. In the present work, A novel process of oxidation roasting followed by oxygen pressure leaching in a CH4SO3-H2O system is proposed to dispose of this kind of complex chalcopyrite. The leaching behavior and kinetic characteristics of copper in complex chalcopyrite calcine are studied. The results show that under the optimal leaching conditions (reaction temperature 150°C, oxygen partial pressure 0.8 MPa, initial methylsulfonic acid concentration 150 g/L, reaction 120 min), the copper leaching rate reaches 92.84%. XRD and SEM-EDS analyses show lead in the leached residue in the form of lead sulfate, obtained by the pressure leaching process of methylsulfonic acid, which avoids the formation of dangerous solid waste (plumboferrite). The leaching process is consistent with the shrinkage core model of an unreacted core. Copper leaching is mainly controlled by chemical reaction. The apparent activation energy of the reaction is 7.98 kJ·mol-1, and the kinetic equation is as follows: 1-(1-X)1/3 = 0.00455 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">${\text{P}}_{{\text{O}}_{2}}^{{0}\text{.284}}{\text{C}}_{{\text{C}}{\text{H}}_{4}{\text{S}}{\text{O}}_{3}}^{\text{0.4}{60}}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msubsup> <mtext>P</mtext> <mrow> <msub> <mtext>O</mtext> <mn>2</mn> </msub> </mrow> <mrow> <mn>0</mn> <mtext>.284</mtext> </mrow> </msubsup> <msubsup> <mtext>C</mtext> <mrow> <msub> <mtext>CH</mtext> <mn>4</mn> </msub> <msub> <mtext>SO</mtext> <mn>3</mn> </msub> </mrow> <mrow> <mtext>0.4</mtext> <mn>60</mn> </mrow> </msubsup> </mrow> </math></EquationSource> </InlineEquation> exp[− 7980/(8.314 T)]t.

Behavior and Kinetics of Pressurized Methylsulfonic Acid Leaching of Copper from Complex Chalcopyrite Calcine

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发表日期：

2025年9月30日

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Haifei Ma,
Xiaobao Jia,
Yalong Liao,
Min Wu,
Shuangyu Yang

摘要

Although oxygen pressure acid leaching is a promising methodology to extract valuable metals from complex chalcopyrite, there are some drawbacks like requiring a high reaction temperature, long leaching time and easy formation of hazardous solid waste (i.e., plumboferrite) in the leached residue. In the present work, A novel process of oxidation roasting followed by oxygen pressure leaching in a CH₄SO₃-H₂O system is proposed to dispose of this kind of complex chalcopyrite. The leaching behavior and kinetic characteristics of copper in complex chalcopyrite calcine are studied. The results show that under the optimal leaching conditions (reaction temperature 150°C, oxygen partial pressure 0.8 MPa, initial methylsulfonic acid concentration 150 g/L, reaction 120 min), the copper leaching rate reaches 92.84%. XRD and SEM-EDS analyses show lead in the leached residue in the form of lead sulfate, obtained by the pressure leaching process of methylsulfonic acid, which avoids the formation of dangerous solid waste (plumboferrite). The leaching process is consistent with the shrinkage core model of an unreacted core. Copper leaching is mainly controlled by chemical reaction. The apparent activation energy of the reaction is 7.98 kJ·mol^-1, and the kinetic equation is as follows: 1-(1-X)^1/3 = 0.00455 ${\text{P}}_{{\text{O}}_{2}}^{{0}\text{.284}}{\text{C}}_{{\text{C}}{\text{H}}_{4}{\text{S}}{\text{O}}_{3}}^{\text{0.4}{60}}$ $P_{O_{2}}^{0 .284} C_{{CH}_{4} {SO}_{3}}^{0.4 60}$ exp[− 7980/(8.314 T)]t.