高铝煤矸石制备超细氧化铝和硅酸钠联产工艺

Co-production of superfine alumina and sodium silicate from coal gangue

利用盐酸酸浸法从煤矸石中浸取氧化铝,考察了固液比、反应温度、盐酸浓度、反应时间、煤矸石活化时间及活化温度等因素对氧化铝浸取率的影响,通过正交试验确定了最佳的工艺条件,使氧化铝浸取率达到84%左右;研究不同分散剂对氧化铝颗粒硬团聚的抑制作用,利用SEM、XRD对原料及制备的氧化铝进行了表征,表明制备出了高纯度、高分散性的超细氧化铝;同时还研究了氢氧化钠浓度对联产工业液体硅酸钠模数的影响。

Alumina was extracted from coal gangue by hydrochloric acid leaching.The operation parameters of solid-liquid ratio,reaction temperature,concentration of hydrochloric acid,reaction time,activation time and temperature for coal gangue were investigated,and the optimum conditions were obtained byorthogonal experiment.The extraction rate of alumina under optimum conditions could reach 84%.The inhibition of agglomeration of alumina particles by different dispersants were also studied.The raw material and the alumina produced were characterized by means of SEM and XRD,which showed that high purity and highly dispersed superfine alumina was produced.In addition,the effect of the concentration of sodium hydroxide on the modulus of co-produced industrial liquid sodium silicate was also studied.