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Effect of air velocity, pH and frother concentration on vitrinite recovery using column flotation

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Table  1  shows  the  proximate  and  petrographic  analysis  of  raw  coals.  Cerrejón  coal  presented  higher  ash  and  sulphur  content,  whereas  Jagua  coal showed higher heat high value
Table 2. Petrographic analysis of feed and floated samples  for Jagua coal
Figure 1. Vitrinite recovery (% w/w) for Cerrejón coal. (■)  Jg 0.7 cm/s FC 4 ml/kg   (◊) Jg 1.0 cm/s FC 3 ml/kg   (∆) Jg  1.0 cm/s FC 5 ml/kg (X) Jg 1.4 cm/s FC 4 ml/kg   (□) Jg 1.4  cm/s FC 2 ml/kg   (O) Jg 1.4 cm/s FC 6 ml/kg + Jg 1.8 cm/s  FC 3 ml/kg
Table 4. Significance of the variables and their interactions, vitrinite recovery Source df Fcalculated Cerrejón coal Fcalculated Jagua coal Fcrítical

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