新型二烷基黄原酸酯捕收剂 DIDTC 浮选机理.

A positive dialkyl dithiocarbonates collector S-dodecyl O-isopropyl dithiocarbonate (DIDTC) was synthesized and used in the flotation separation of chalcopyrite from pyrite. The results of flotation test indicated that DIDTC collector had better selectivity than butyl xanthate. UV-vis spectra demonstrated that DIDTC showed more affinities to Cu2+ ions than to Fe3+ ions. FTIR spectra and adsorption test were executed to study the adsorption mechanism of DIDTC to chalcopyrite. The results elucidated that DIDTC might bond copper atoms of chalcopyrite surface with its sulfur and oxygen atoms in alkaline environments， and formed a multilayer at high concentration. In addition， the results were analyzed from the structure-activity of collectors by generalized perturbation theory and density functional calculation with GGA/PW91 as exchange correlation functional. [ABSTRACT FROM AUTHOR]