Enhancing selectivity of modifier on magnesite and dolomite surfaces by pH control

The separation of magnesite from dolomite using flotation is difficult owing to their similar crystal structure, chemical and surface composition, and dispulp characteristics. In this study, in the flotation system with sodium oleate (NaOL) as the collector, to improve the flotation separation effic...

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Bibliographic Details
Published in:Powder technology 2020-02, Vol.362, p.698-706
Main Authors: Yao, Jin, Sun, Haoran, Han, Fang, Yin, Wanzhong, Hong, Jongsu, Wang, Yulian, Won, Changdok, Du, Liangang
Format: Article
Language:English
Subjects:
Chemical composition
Contact angle
Contact potentials
Crystal structure
Dolomite
EDDHA
Ethylenediamine
Flotation
Fourier transforms
Infrared spectrophotometers
Infrared spectroscopy
Magnesite
Magnesium carbonate
Minerals
p-Hydroxyphenylacetic acid
pH control
pH effects
Photoelectron spectroscopy
Photoelectrons
Selectivity
Separation
Sodium oleate
Spectrophotometry
Spectrum analysis
Zeta potential
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Summary:The separation of magnesite from dolomite using flotation is difficult owing to their similar crystal structure, chemical and surface composition, and dispulp characteristics. In this study, in the flotation system with sodium oleate (NaOL) as the collector, to improve the flotation separation efficiency, the differential floatability between both the minerals was increased using ethylenediamine-N,N′-bis(2-hydroxyphenylacetic acid) (EDDHA). The results demonstrated that the selectivity of EDDHA for both minerals was high at a pH of 11.0 using 50 mg/L of EDDHA and 120 mg/L of NaOL. The recoveries of magnesite and dolomite were 92.07% and 10.82%, respectively. To observe the adsorption of EDDHA on the surfaces of the minerals and investigate its flotation mechanism, zeta potential, contact angle, ultraviolet spectrophotometry, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy measurements were conducted. The pH adjustments in two stages in the flotation system enhanced the selectivity of EDDHA. [Display omitted] •EDDHA regulator can selectively inhibit magnesite, selective flotation separation of magnesite from dolomite was achieved.•The adsorption of EDDHA by minerals is influenced the initial pH of pulp.•EDDHA is predominantly adsorbed on the Mg sites of mineral surfaces.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2019.12.040