Abstract: To achieve the efficient utilization of high-sulfur bauxite from Guizhou,this study employed process mineralogy
analysis system (BPMA) based on Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) to conduct
a systematic mineralogical characterization of an ore sample assaying Al2O3 of 56. 16% and S of 4. 58%. The study accurately
revealed the occurrence states of aluminum and sulfur,as well as the dissemination characteristics of the main minerals,
which guided the subsequent flotation desulfurization tests. Through condition optimization,the optimal parameters were determined
as follows:grinding fineness of 85% passing 75 μm,natural pulp (pH=6),CuSO4 as activator (50 g/ t),and butyl xanthate
mixed with ammonium butyl aerofloat as combined collector (30+120 g/ t). A closed-circuit flotation flowsheet consisting
of "one roughing,two cleaning,and three scavenging" stages was finally adopted,successfully producing a high-quality aluminum
concentrate with a yield of 82. 85%,containing 65. 05% Al2O3 and only 0. 48% S,corresponding to an aluminum-silicon
ratio (A/ S) of 12. 19. The Al2O3 recovery and desulfurization rate reached 95. 96% and 91. 29%,respectively. This research
demonstrates that BPMA technology can provide critical mineralogical basis for flotation process development,offering a reliable
technical solution and practical reference for the efficient beneficiation and utilization of such high-sulfur bauxite resources.

Key words: diaspore,pyrite,desulfurization flotation,BPMA,process mineralogy