中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 12 December 2025 |
（1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization, Central South University, Changsha 410083, China;
3. Technology Research Center of Hunan Province for Comprehensive Utilization of Associated Fluorite and Fluorine Chemical Engineering, Chenzhou 423000, China）
Abstract:The flotation separation of cassiterite and dravite was realized using lead complexes of benzohydroxamic acid (Pb-BHA) as a collector and sodium fluosilicate (SF) as a depressant. Zeta potential tests confirmed that SF enabled the selective depression of dravite. The results of Fourier transform infrared (FTIR) spectroscopy analysis demonstrated that hydroxyl-containing groups in the hydrolysis products of SF selectively chemisorbed on the surface of dravite. X-ray photoelectron spectroscopy (XPS) analysis results further demonstrated the strong chemisorption of SF hydrolysis products (F-containing groups and hydroxyl-containing groups) on dravite (Mg sites). Consequently, the adsorption of Pb-BHA on dravite was selectively prevented. Based on the results, a selective depression model of SF on cassiterite and dravite was proposed.
Key words: selective depression effect; flotation separation; sodium fluorosilicate; cassiterite; dravite; benzohydroxamic acid
