利用粉煤灰提取氧化物的研究进展

为了减轻粉煤灰对环境的污染以及提高其综合利用率,阐述了粉煤灰精细化利用的重要性,介绍了粉煤灰的化学组成及矿物组成,得出了粉煤灰中提取Al_2O_3和SiO_2的潜在价值及存在的问题。介绍了粉煤灰提取氧化物的3种主要方法:酸法、碱法、酸碱联合法,并探讨了各种方法的优缺点。在此基础上指出了目前我国实现粉煤灰提取Al_2O_3联产SiO_2工业化生产的不足:对设备要求较高、易造成二次污染以及成本过高。最后对粉煤灰的精细化利用进行了展望。 In order to make full use of fly ash and reduce its pollution,the chemical composition,mineral composition of fly ash were introduced.The potential value and main problems of extracting Al_2O_3 and SiO_2 from fly ash were investigated. Three main extraction methods which were acid process,alkaline process and combination of acid and alkaline process as well as their advantages and disadvantages were presented in this paper.High cost,high equipment requirement and secondary pollution limited the industrial application of the technology