用铝灰制备氢氧化铝的试验研究  

Preparation of Aluminum Hydroxide From Aluminum Ashes

作　　者：张晶[1] 李风亭[1] 张冰如[1] 

机构地区：[1]同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室,上海200092

出　　处：《湿法冶金》2007年第4期206-208,共3页Hydrometallurgy of China

摘　　要：作为铝业废渣,铝灰中含有20%～50%的铝。利用铝灰生产氢氧化铝并进而生产高纯聚合氯化铝,能够有效利用资源,消除环境污染。通过试验,提出了用铝灰制备氢氧化铝的工艺流程,并以铝灰中铝的溶出率和氢氧化铝中氧化铝质量分数2个指标。对碱溶法制备氢氧化铝工艺中的影响因素进行了讨论。结果表明,延长反应时间,加大碱的投入量,可以提高铝的溶出率以及成品氢氧化铝中氧化铝的质量分数。There are 20%- 50% of aluminum in aluminum ash from aluminum industry. The preparation of aluminum hydroxide with the aluminum ash and production of high purity polyaluminium chloride are studied. Based on experiment results, the processes and influence factors for preparation of aluminum hydroxide with the aluminum ashes and sodium hydroxide solution have been discussed. The dissolving rate of aluminum from aluminum ashes and mass fraction of alumina in aluminum hydroxide as two evaluation indexes are put forwarded. The results show that prolonging reaction time and increasing dosage of aluminum hydroxide can improve reaction process and alkaline leaching rate of aluminum.

关 键 词：铝灰 氢氧化铝 碱溶法 制备 

分 类 号：TF821[冶金工程—有色金属冶金]