Journal
MINERALS ENGINEERING
Volume 160, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2020.106660
Keywords
Magnesite; Quartz; EDTMPS; DFT calculations; Adsorption model
Funding
- General Program of the National Natural Science Foundation of China [51874072, 51974064]
- Fundamental Research Funds for the Central Universities, China [180104017, N2001029]
- Educational Commission of Liaoning Province of China [2019LNQN09]
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In this study, EDTMPS was introduced as a chelation depressant to selectively depress magnesite in a magnesite-quartz flotation system using DDA as the collector. Results from micro-flotation tests showed that EDTMPS interfered with the interaction of DDA with magnesite, leading to the successful separation of magnesite from quartz. The study also utilized contact-angle and zeta-potential measurements, FTIR and XPS analysis, as well as DFT calculations to understand the mechanism behind the improved separation efficiency.
In this study, to improve the separation efficiency of magnesite from quartz, ethylenediamine tetra(methylene phosphonic acid) sodium (EDTMPS) was first introduced as a chelation depressant for the selective depression of magnesite in magnesite-quartz flotation system when using dodecylamine (DDA) as the collector. The results of micro-flotation tests indicated that EDTMPS selectively depressed magnesite flotation and achieved the separation of magnesite from quartz via reverse flotation. Contact-angle and zeta-potential measurements demonstrated that EDTMPS interfered with the interaction of DDA with magnesite rather than quartz, resulting in the low hydrophobicity of magnesite in the presence of DDA. Fourier-transform infrared (FTIR) spectroscopy and Xray photoelectron spectroscopy (XPS) analysis showed that EDTMPS could prevent DDA adsorption onto a magnesite surface could be attributed to selective chelation on Mg, but had only a slight impact on a quartz surface. Density functional theory (DFT) calculations further revealed that the interaction between DDA and magnesite was weakened by the pre-adsorption of EDTMPS; this observation was supported by the enlarged distance between N atoms for DDA and magnesite surface (from 2.636 angstrom to 8.003 angstrom) in the presence of EDTMPS. Based on these results, a possible model for the flotation separation process was proposed.
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