Abstract:In view of the unsatisfactory flotation index of thioazapropionitrile ester collectors represented by Ester-105 under low temperature conditions, a thiazapropionitrile Ester named BL was synthesized by solvent synthesis method using dimethyl sulfoxide as a solvent. The flotation experiments show that the temperature has an effect on the flotation indexes of both collectors, but has a small effect on BL .The collection performance of BL under low temperature conditions is significantly better than that of Ester-105. Infrared spectroscopy analysis shows that BL has chemical adsorption on the surface of chalcopyrite, and the active sites for BL and copper ions adsorption are mainly dithiocarboxyl groups. Alaser particle size analyzer was used to compare the dispersion of BL and Ester-105 in water. It was found that the particle size of BL in water was smaller than that of Ester-105 at different temperatures, and this difference was especially obvious at low temperatures. It is indicated that the solvent synthesis method can improve the low-temperature dispersibility of thiazepine propionitrile ester collectors, thereby improving its low-temperature collection performance.