A$.$ Is control of the $pH$ important in the froth flotation process? Why or why not?

B$.$ What does a frother do$?$

C$.$ What does a collector do$?$

D$.$ When making a flotation separation at $pH6$ for a material with a PZC $($point of zero charge$)$ of $pH9,$ which collector should be used? Why?

a$)$ Sulfonate

b$)$ Amine

E$.$ Do frothing agents act on the gas$-$liquid interface, the gas$-$solid interface, or the liquid$-$solid interface?

F$.$ When dewatering a fine slurry, your goal is to recover as many particles as possible. Would you select a filter or a centrifuge? Why?

G$.$ When dewatering a fine slurry, your goal is to get to the lowest moisture possible without excessive temperature. Would you select a filter or a centrifuge? Why?