Enhanced separation of high concentration coal slurry by a two stages process with different flotation columns
Article
Xie, GY, Ni, C, Zhang, M et al. (2014). Enhanced separation of high concentration coal slurry by a two stages process with different flotation columns
. 39(5), 947-953. 10.13225/j.cnki.jccs.2013.1103
Xie, GY, Ni, C, Zhang, M et al. (2014). Enhanced separation of high concentration coal slurry by a two stages process with different flotation columns
. 39(5), 947-953. 10.13225/j.cnki.jccs.2013.1103
In order to improve effect separation of high concentration coal slurry, a jet flotation column (JFC) and a cyclonic micro-bubble flotation column (FCMC) was adopted to comprise a two stage flotation system (JFC&FCMC) combining advantages of the two flotation columns. A favorable performance was obtained in treating high concentration coal slurry with the JFC&FCMC flotation system when compared with that of the single stage FCMC system. The comparison of results at the same clean coal ash level indicate that, when feed concentrations are set at 100, 120, 140, 160 g/L, clean coal yields of JFC&FCMC system are 2.85%, 1.82%, 0.93%, 1.20% higher (1.70% on average) respectively than that of single stage FCMC, flotation perfect indexes of all size fractions are 1.17%, 0.56%, 1.48%, 1.59% higher (1.20% on average) respectively, while a more significant increase is obtained at the 0.50-0.25 mm coal slime, whose flotation perfect index are 8.22%, 6.15%, 8.83%, 9.51% higher (8.18% on average) in each concentration. So it can be concluded that JFC&FCMC system can combine the advantages of JFC and FCMC whereby separating whole fraction of high concentration coal slurry effectively. Its superiority over FCMC in treating high concentration coal slurry rises with the coal slurry concentration.
