It uses in classifying in non-ferrous and ferrous metal mineral. SF is the mechanical agitation type, and it can own draw It can own draw the inspiration and the pulp; Compared to A, its spirit is big , and the power loss low, and the impeller lap wears lightly; JIF has the self-absorption ability, the suction intensity big, and it may adjust the air input in 0.1---1m3/m2min; the impeller diameter is small, the rotational speed low, consuming electricity few, also advantageous for the automatic control.