Mechanism of quartz flotation separation from gypsum using tetradecyl trimethyl ammonium chloride: Guiding the improvement of phosphogypsum quality - Haodong Shi; Liuyi Ren; Shenxu Bao; Yimin Zhang; Anh V. Nguyen; Bo Chen; Weifeng Li; Rui Huang; Yanqi Zeng; Sidi Lou (Minerals Engineering, 2025)