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采用KOH亚熔盐介质溶出中低品位一水硬铝石型铝土矿,考察了反应温度、碱矿比、初始KOH溶液浓度、反应时间及添加CaO对溶出后赤泥化学成分和物相的影响.结果表明,在反应温度220℃、碱矿质量比1.5、初始KOH溶液浓度50%(ω)、反应时间1h的条件下,Al2O3回收率可达81.4%,赤泥的铝硅质量比降至1.06,赤泥中硅主要以KAlSiO4形式存在.溶出过程中添加CaO不能提高Al2O3溶出率.进一步回收溶出后赤泥中的K2O和Al2O3,终赤泥中K2O含量降至0.61%,Al2O3含量降至8.09%,Al2O3总回收率可达90.7%.
Low-grade diasporic bauxite was eluted by KOH sub-molten salt medium. The effects of reaction temperature, alkali-mineral ratio, concentration of initial KOH solution, reaction time and addition of CaO on the chemical composition and phase of red mud .The results showed that the Al2O3 recovery rate was up to 81.4% at the reaction temperature of 220 ℃, the alkali mass ratio of 1.5, the concentration of initial KOH solution of 50% (ω) and the reaction time of 1h, To 1.06, the content of silicon in red mud mainly existed in the form of KAlSiO4. Adding CaO during the dissolution process could not increase the dissolution rate of Al2O3. After further recovering the K2O and Al2O3 from the red mud, the K2O content in the final red mud decreased to 0.61% To 8.09%. The total recovery of Al2O3 can reach 90.7%.