【摘要】 为了确定锅炉底渣的最佳煅烧活化条件,以氢氧化钠为活化剂对锅炉底渣煅烧活化工艺做了研究。通过扫描电镜(SEM)和X射线衍射(XRD)表征观察了锅炉底渣的微观形貌和锅炉底渣中矿物组成,采用滴定法测定不同煅烧活化条件下所得的活化产物中氧化铝与二氧化硅的溶出率,确定了锅炉底渣的最佳煅烧活化工艺参数:锅炉底渣与NaOH的质量比为1∶1.2、煅烧温度为700℃、保温时间为2.5 h、升温速率为4℃/min。在此工艺条件下,锅炉底渣中莫来石和石英相基本消失,转化为可溶性的硅铝酸钠,锅炉底渣得到充分活化,锅炉底渣中硅铝溶出率最佳。更多还原

【Abstract】 In order to determine the optimum calcination activation conditions of boiler bottom slag, the activation process for burning boiler bottom slag with NaOH as accessory ingredient was investigated.The micro appearance of boiler bottom slag was tested by SEM and the phases of mineral of boiler bottom slag were characterized by XRD.The dissolution rates of SiO₂ and Al₂O₃ in activation products under different activation conditions were measured by the titration.The experimental results that the optimal parameters were obtained as follows:the mass ratio of boiler bottom slag and NaOH was 1∶1.2,the calcination temperature was 700 ℃,the holding time was 2.5 h,and the heating rate was 4 ℃/min.Under the optimal conditions,the mullite and quartz were basically disappeared and the product was mainly made up of soluble NaAlSiO₄.The boiler bottom slag was activated adequately and the dissolution rates of alumina and silica from boiler bottom slag was the best.更多还原