Abstract: It is an indispensable to pulp pre-process before flotation, for it’s great importance for purpose minerals mineralization, dispersion， mixing with reagents, and finally improving flotation index. Specifically, conditioners are most widely used and its continuous optimization makes it more efficient and energy-saving; Impeller agitating type mixer and pulp preparation device origin early but gradually fade away due to their pollution and poor mixing effect; spray-drop cabinet and pipeline mixer are mainly used in coal purification with their advantage of energy-saving and simple operation，while the giant volume of cabinet and short mixing time in pipeline constraint the application of the two device; Pulp surface modifier becomes a research hotspot due to its high dispersing and mixing efficiency and its application covering both non-metal and metal mine. It is pointed out that there is a lack of direct appraising method of mixing effect and current mixer needs specially designed. Research should be focused on the degree of reagent dispersion, mixing with minerals，or absorbing on minerals surface to evaluate mixing effect directly. Besides， different types of minerals need different mixing environment and mixers should be modified correspondingly.

Key words: Flotation, Pulp pretreatment, Disperse, Stirring, Surge tank