【摘要】 以粉煤灰和硫酸为原料,经活化、磁选、硫酸浸出、硫酸铝溶出、结晶制备出Al2(SO4)3.18H2O。硫酸铝经煅烧、γ-Al2O3碱溶和晶种分解、氢氧化铝煅烧等过程制备出冶金级氧化铝。本文给出了完整的工艺流程,对此工艺进行了详细阐述。在最佳条件下,粉煤灰中氧化铝提取率可达92.3%。更多还原

【Abstract】 Hydrated aluminium sulfate（Al₂（SO₄）₃·18H₂O） were prepared by activating,magnetic separation,leaching by sulfuric acid,leaching by hot water,crystallization processes using fly ash and sulfuric acid as raw materials.Metallurgy grade alumina was prepared by calcining aluminium sulfate,γ-Al₂O₃ dissolved by alkali,decomposition of sodium aluminate solution and calcining aluminium hydroxide processes.The whole flow process was confirmed.The extracting efficiency of Al₂O₃ can reach 91.6 percent under the optimum conditions.更多还原