Discussion
State whether the following is true or false.
Hydraulic classification separates strictly by particle size regardless of density.
Answer: B
Correct answer: False
Hydraulic classification separates by settling velocity, and that depends on density as well as on size - Stokes’s law contains the difference between the particle and fluid densities. A small dense grain therefore settles with a large light one, and the two report together. That is a limitation when the impurity is dense, and it is exactly what makes a classifier useful when the impurity is both coarse and dense, as quartz is in a clay.
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