摘要
Aluminum was leached out from coal fly ash by pressure acid-leaching method. The effects of coal fly ash size, sulfuric acid concentration, reaction time and reaction temperature on extraction efficiency of aluminum were investigated comprehensively. The phase and morphology of coal fly ash and solid residues after reaction were analyzed by XRD, SEM and IR. The optimal technological conditions for extracting aluminum from coal fly ash were eventually confirmed that coal fly ash with size of 74 μm and sulfuric acid with concentration of 50% are mixed in pressure reaction kettle to react for 4 h at 180 ℃. Under the optimal conditions, the extraction efficiency of aluminum can reach 82.4%.
利用加压酸浸法从粉煤灰中提取铝。研究了粉煤灰粒度、硫酸浓度、反应时间、反应温度对铝提取率的影响。通过XRD、SEM、IR对反应前、后的粉煤灰进行物相和形貌分析。确定的最佳工艺条件为粉煤灰粒度74μm,硫酸浓度50%,反应时间4h,反应温度180℃。在最佳工艺条件下,氧化铝的提取率为82.4%。
基金
Project (BO210(2008)) supported by the Foundation of "Hundred Talent Program" of Chinese Academic of Sciences
Project (2008-G-158) supported by the Scientific and Technological Project of Qinghai Province, China
