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ArticleName The influence of anionic, cationic and nonionic flocculant reagents on settling of coal slurry in water
DOI 10.17580/gzh.2020.05.08
ArticleAuthor Nikolaev A. A., Kairatova G. K., Goryachev B. E.

NUST MISIS, Moscow, Russia:

A. A. Nikolaev, Associate Professor, Candidate of Engineering Sciences,
G. K. Kairatova, Holder of a Master’s Degree
B. E. Goryachev, Professor, Doctor of Engineering Sciences


In the paper, the studies of coal slurry settling in water are presented. The experiments were carried out in graduated cylinders with a volume of 500 ml. Cationic, anionic and non-ionic reagents of Magnafloc series were used as flocculants. The effect of flocculants on the settling rate of coal slurry particles, solid content in the sediment and liquid purity of the clarified layer was studied. The purity of water was examined by means of photometric analysis. The results indicate that to achieve the purity of water in the clarified layer (light transmission T = 94÷94.5%), flocculants Magnafloc 10 or Magnafloc 380 are required at the consumption of about 50 g/t. The coal slurry settling time was 40 min. A moderately pure clarified layer can be obtained within a short settling time using Magnafloc 333 as flocculant. Small flocculant consumption (q ~ 1 g/t) for Magnafloc 10, 333, 336, 1011 or 345 revealed moderately pure (82.0–87.4 %) clarified layer. The findings show that an increase in the flocculant consumption results in a growth of settling rate and solid content of coal slurry. There was an insignificant decrease in the slurry solid content at the maximum settling rate when Magnafloc 345, 333 and 5250 were used. This may be due to formation of large flocs, which generate slurry of high porosity. Magnafloc 10 at a consumption of 50 g/t can be recommended as an anionic flocculant to achieve a high rate of thickening (2.6 cm/min) of coal slurry and to obtain slurry with a high content of solids (60 %) and a pure discharge of thickener.

keywords Coal slurry, settling, sedimentation, thickening, flocculants, Magnafloc, precipitation curve, settling rate, clarified layer purity, solid content of slurry, photometry

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