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Research Article

Mechanism of enhanced microfine low-rank coal flotation by jet slurry conditioning

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Received 07 Feb 2024, Accepted 17 Mar 2024, Published online: 23 Mar 2024
 

ABSTRACT

Microfine low-rank coals are subject to metamorphic changes that hinder their floatability, impeding their clean and efficient utilization. The objective of this study was to refine the jet-slurry technique to enhance the floatability of microfine low-rank coals. Furthermore, advanced methods including Focused beam reflectance measurement (FBRM), high-sensitivity microelectromechanical balancer (DCAT), Fourier transform infrared spectrometer (FTIR), and scanning electron microscope (SEM) were employed to dissect the physicochemical effects of jet slurring on microfine low-rank coal particles. The study found that as the concentration of microfine coal particles increased, surface reagent adsorption initially rose and then fell with greater feed volumes. In contrast, adhesion forces displayed an inverse trend. Optimal results were achieved with a feed volume set at 25 L/min. This phenomenon is attributable to multiple regulatory factors. Within certain limits, intensifying conditioning promotes particle agglomeration, curtails fine gangue mineral coverage, boosts sodium dodecyl sulfate (SDS) adsorption, diminishes microfine coal wettability, and better kerosene-coal particle mixing. However, at excessive jet speeds (30 L/min), substantial physical pressure variances and mechanical dispersion forces arise, undermining SDS or kerosene’s chemical adsorption to coal or modified coal, thus reducing reagent attachment. The aforementioned study demonstrates that within certain parameters, jet slurring significantly betters coal-gangue separation, thereby amplifying the flotation efficacy of microfine low-rank coals. This research offers strategic insights into microfine low-rank coal flotation processes and lays a theoretical groundwork for the selection of suitable techniques and reagents.

Disclosure statement

No potential conflict of interest was reported by the author(s).

CRediT authorship contribution statement

Zeyu Liu: Writing – original draft. Yuping Fan: Data curation, Investigation, Editing, Software Validation, Formal analysis, Supervision, Funding acquisition. Xiaomin Ma: Validation, Formal analysis, Supervision. Xianshu Dong: Investigation, Funding acquisition, Writing – original draft preparation. Maoqing Yang: Writing – original draft preparation

Additional information

Funding

The work was supported by the National Natural Science Foundation of China [51820105006].

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