Depression behaviors of N-thiourea-maleamic acid and its adsorption mechanism on galena in Mo-Pb flotation separation
In present study, a novel organic depressant N-thiourea-maleamic acid (TMA) was synthesized and applied as a galena depressant in the flotation separation of Mo-Pb ores. The depression behaviors of TMA were tested through flotation experiments. A wider separation window for single minerals over 90.0...
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| Published in | International journal of mining science and technology Vol. 32; no. 1; pp. 181 - 189 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
01.01.2022
Elsevier |
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| Abstract | In present study, a novel organic depressant N-thiourea-maleamic acid (TMA) was synthesized and applied as a galena depressant in the flotation separation of Mo-Pb ores. The depression behaviors of TMA were tested through flotation experiments. A wider separation window for single minerals over 90.0% was obtained at 30.0 mg/L TMA, confirming that TMA could depress galena significantly, while effected molybdenite floatability slightly. An effective separation was obtained for artificially mixed minerals and actual Mo-Pb ores. The adsorption mechanism on galena was revealed by UV–Vis spectra, zeta potential tests, Fourier transform infrared spectroscopy (FT-IR) analysis, contact angle tests and X-ray photoelectron spectroscopy (XPS) analysis. The zeta potentials of galena became more negative and the contact angle of galena dropped from initial 74.36° to 57.8° with 30.0 mg/L TMA depressant, inferring that TMA had adsorbed on galena surface. The analysis results of UV–Vis spectra, FT-IR and XPS gave further evidence that TMA might chemisorb on galena surface via Pb sites on galena surface and the thiourea group in TMA molecular structure, while the carboxyl group played a role of hydrophilicity. |
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| AbstractList | In present study, a novel organic depressant N-thiourea-maleamic acid (TMA) was synthesized and applied as a galena depressant in the flotation separation of Mo-Pb ores. The depression behaviors of TMA were tested through flotation experiments. A wider separation window for single minerals over 90.0% was obtained at 30.0 mg/L TMA, confirming that TMA could depress galena significantly, while effected molybdenite floatability slightly. An effective separation was obtained for artificially mixed minerals and actual Mo-Pb ores. The adsorption mechanism on galena was revealed by UV–Vis spectra, zeta potential tests, Fourier transform infrared spectroscopy (FT-IR) analysis, contact angle tests and X-ray photoelectron spectroscopy (XPS) analysis. The zeta potentials of galena became more negative and the contact angle of galena dropped from initial 74.36° to 57.8° with 30.0 mg/L TMA depressant, inferring that TMA had adsorbed on galena surface. The analysis results of UV–Vis spectra, FT-IR and XPS gave further evidence that TMA might chemisorb on galena surface via Pb sites on galena surface and the thiourea group in TMA molecular structure, while the carboxyl group played a role of hydrophilicity. |
| Author | Zhu, Yangge Zhang, Xingrong Lu, Liang Zheng, Yongxing Xiong, Wei |
| Author_xml | – sequence: 1 givenname: Liang surname: Lu fullname: Lu, Liang organization: State Key Laboratory of Mineral Processing, Beijing 102628, China – sequence: 2 givenname: Wei surname: Xiong fullname: Xiong, Wei organization: State Key Laboratory of Mineral Processing, Beijing 102628, China – sequence: 3 givenname: Yangge surname: Zhu fullname: Zhu, Yangge organization: State Key Laboratory of Mineral Processing, Beijing 102628, China – sequence: 4 givenname: Xingrong surname: Zhang fullname: Zhang, Xingrong email: zhxr1984@126.com organization: State Key Laboratory of Mineral Processing, Beijing 102628, China – sequence: 5 givenname: Yongxing surname: Zheng fullname: Zheng, Yongxing organization: State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, China |
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| Title | Depression behaviors of N-thiourea-maleamic acid and its adsorption mechanism on galena in Mo-Pb flotation separation |
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