Action time effect of lime on its depressive ability for pyrite

Tichang Sun Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China

摘 要：<正> Two sample groups of bulk concentrates consisting mainly of pyrite and chalcopyrite from Daye and Chenghchao Minesin Hubei Province of China were used to investigate the effect of the action time of lime on its depressive ability for pyrite. The ex-perimental results conducted with different samples and collectors showed that the action time between lime and pyrite markedly in-fluences the depressive ability of lime. The depressive ability of lime increased with the action time increasing. It was also provedthat the depressive results obtained at a large lime dosage after a shorter action time are similar to those obtained at a small lime dos-age after a longer action time. The increase of depressive ability of lime after a longer action time is because that there are differentmechanisms in different action time. The composition on the surface of pyrite acted for different time with lime was studied by usingESCA （Electron Spectroscopic Chemical Analysis）. The results showed that iron hydroxide and calci

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