【摘要】 贵州某难选高硅铝土矿Al₂O₃的含量为48.27%,SiO₂的含量为20.72%,A/S仅为2.35,主要含铝矿物为一水硬铝石，脉石矿物主要为高岭石，属于低质高硅铝土矿。脉石矿物在磨矿中极易泥化，且原矿铝硅比较低，严重影响浮选指标。本研究采用“两粗三精两扫-一次精扫选”闭路工艺流程，得到浮选精矿产品，产率为47.66%,Al₂O₃含量为61.33%,SiO₂含量为9.47%,A/S为6.48,满足拜耳法氧化铝生产工艺的要求，可以为难选高硅铝土矿的资源综合利用提供技术参考。更多还原

【Abstract】 A study was conducted on a difficult-to-process high-silica bauxite ore from Guizhou, containing 48.27% Al₂O₃ and 20.72% SiO₂, with an extremely low aluminum-to-silicon ratio（A/S） of only 2.35. The primary aluminum-bearing mineral is diaspore, while the main gangue mineral is kaolinite, categorizing it as a low-grade, high-silica bauxite ore. Addressing the issues of severe gangue slime formation during grinding and the low A/S of the run-of-mine ore, which significantly impair flotation performance, this study employed a closed-circuit flotation process consisting of "two roughing stages, three cleaning stages, two scavenging stages, and one pre-scavenging stage". The final flotation concentrate yielded a mass recovery of 47.66%, with an Al₂O₃ content of 61.33%, a SiO₂ content of 9.47%, and an A/S ratio of 6.48. This product meets the feed requirements for the Bayer process for alumina production, offering a technical reference for the comprehensive utilization of difficult-to-process high-silica bauxite resources.更多还原