In grinding a continuous flow of pigments for paint, our company finds that too many too-small and
Question:
In grinding a continuous flow of pigments for paint, our company finds that too many too-small and too many too-large particles exit from our well-mixed grinder. A multistage grinder, approximating plug flow, could also have been used, but wasn't. Anyway, in either type of grinder the pigments are progressively ground into smaller and smaller particles.
At present, the exit stream from our well-mixed grinder contains 10% too-large (dP > 147, μm); 32% just-right (dP = 38 - 147 μm); and 58% too small (dP < 38 μm) particles.
(a) Can you suggest a better grinding scheme for our present unit, and what would it give?
(b) How about the multistage grinder? How would it do?
By "better" we mean giving more just right-sized pigment in the product stream. Also, separation and recycle of the size cuts is not practical.
Step by Step Answer:
a A better grinding scheme for your present unit would involve modifying the operating conditions to achieve a higher percentage of justrightsized pig...View the full answer
