| This study investigates the parameters affecting the grinding process in a
tumbling wet ball mill to produce a highly loaded, finely grouded slurry with good
rheological properties and good stability. The independent factors selected were solids,
amount of dispersant and grind time. Experiments were conducted by choosing independent
factor levels corresponding to a central composite design. The response data were fit to
the independent factors with a second-order model. Contour plots were drawn to better
understand the effect of solids, dispersand [ammonium lignosulfonate (ALS)] and grind time
on the particle size reduction and slurry rheology. It was observed that excess amounts of
ALS may cause hard packing. ALS was found to aid particle size reduction only at higher
grind times. Keywords: coal-water fuel, ball mill, slurry,
dispersand
      
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