The hydroxides

sulphides and phosphates precipitates of Ni2+

Zn3+

Ph2+

Fe3+

Bi3+

Cr3+

Ce4+ are nced to investigate the effective factors of the apparent flotation activation energy (Ef). The main physical and chemical factors include: the type and form of the precipitates

the adsorbed form of the foaming agent on the precipitates

various foaming agent and the mode of flotation. The results indicate that the Ff of noncrystal line precipitates is lower than that of the crystal line the Ef of the hydroxides is lower than that of sulphides; for the chemical adsorption of foaming agent on the precipitate

the Ef is low; the Ef of LC-I for foaming agent is the lowest among three foaming agents (sodium lauryl surifate

sodium oleate and LC-I agent) and Ef of the cycloneaeration flotation is the lowest among three modes of flotation (conventional dissolved flotation

air diffusion flotation

cyclone-aeration flotation ) are used. Various inorganic precipitate flotation kinetic studies showed that the flotation of abovenentioned precipitates could be described by an first-order reaction equation.