Journal
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
Volume 30, Issue 6, Pages 859-864Publisher
ELSEVIER
DOI: 10.1016/j.ijmst.2020.07.008
Keywords
Coal tailings; Filtration; Slurry conditioning; Nuclear magnetic resonance; X-ray micro-tomography
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20180657]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The present work aimed to study the effect of slurry conditioning on flocculant-aided filtration of coal tailings by the analysis of filtration kinetics and filter cake structure. Laboratory filtration tests of the coal tailings showed that both the shear rate and agitation time have significant effects on filtration rate and cake moisture. Moderate agitation at the shear rate of 92 s(-1) was favorable for fast filtration, but high cake moisture was encountered. The low-field H-1 nuclear magnetic resonance (NMR) measurements of the filter cake showed that the slurry conditioning has a significant effect on the residual water in large pores and a negligible effect on the residual water in small pores. The X-ray micro-tomography (XRM) measurements indicated that the filter cake formed at the shear rate of 92 s(-1) has more macro-pores and higher porosity than that formed at the shear rate of 53 s(-1), hence more residual water was entrapped in filter cake. The slurry conditioning in the presence of flocculant will change the structure of filter cake and affect the filtration performance. There was a paradox between fast filtration rate and low filter cake moisture. The findings enable better understanding of the effect of slurry conditioning on flocculant-aided filtration of coal tailings. (C) 2020 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
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