To enable the utilization of low-grade and high-sulfur bauxite, the suspension calcination was used to remove the sulfur and the activate silica minerals, and the calcinated bauxite was subjected to a desilication process in NaOH solution under atmospheric pressure. The desulfurization and desilication properties and mineralogical evolution were studied by X-ray diffraction, thermogravimetry-differential thermal analysis, scanning electron microscopy, and FactSage methods. The results demonstrate that the suspension calcination method is efficient for sulfur removal: 84.21% of S was removed after calcination at 1000°C for 2 min. During the calcination process, diaspore and pyrite were transferred to α-Al₂O₃, magnetite, and hematite. The phase transformation of pyrite follows the order FeS₂ → Fe₃O₄ → Fe₂O₃, and the iron oxides and silica were converted into iron silicate. In the alkali-soluble desilication process, the optimum condition was an alkali solution concentration of 110 g/L, a reaction time of 20 min, and a reaction temperature of 95°C. The corresponding desilication ratio and alumina loss ratio were 44.9% and 2.4%, respectively, and the alumina-to-silica mass ratio of the concentrate was 7.9. The Al₂O₃·2SiO₂, SiO₂, and Al₂O₃ formed during the calcination process could react with NaOH solution, and their activity decreased in the order of Al₂O₃·2SiO₂, SiO₂, and Al₂O₃.

为了能够利用低品位和高硫铝土矿，悬浮煅烧用于除去硫和活性二氧化硅矿物，并将煅烧的铝土矿在大气压下于NaOH溶液中进行脱硅处理。通过X射线衍射，热重分析，差示热分析，扫描电子显微镜和FactSage方法研究了脱硫和脱硅性能以及矿物学演变。结果表明，悬浮煅烧方法对硫的去除是有效的：在1000°C下煅烧2分钟后，去除了84.21％的S。在煅烧过程期间，硬水铝石和黄铁矿被转移到的α-Al ₂ ö ₃，磁铁矿和赤铁矿。黄铁矿的相变顺序为FeS ₂ →Fe ₃ O ₄ →Fe ₂ O ₃，氧化铁和二氧化硅转化为硅酸铁。在碱溶性脱硅过程中，最佳条件是碱溶液浓度为110g / L，反应时间为20min，反应温度为95℃。相应的脱硅率和氧化铝损失率分别为44.9％和2.4％，并且精矿的氧化铝与二氧化硅的质量比为7.9。Al ₂ O ₃ ·2SiO ₂，SiO ₂和Al ₂ O ₃煅烧过程中形成的碳纳米管可与NaOH溶液反应，其活性依次下降为Al ₂ O ₃ ·2SiO ₂，SiO ₂和Al ₂ O ₃。