粉煤灰提取氧化铝的资源化利用

Resource Utilization of Alumina Extracted from Fly Ash

粉煤灰富含多种有价金属元素,应用潜力极大。为同时实现资源的综合利用与环境保护,人们可以利用粉煤灰富集氧化铝并还原制备硅铁合金。碳热还原法是新兴的从粉煤灰中提取氧化铝并制备硅铁合金的方法。本文总结了利用酸法和碱法从粉煤灰中提取氧化铝的优缺点,然后着重从热力学角度分析了还原过程可能发生的反应和氧化铁的添加对还原反应的影响。

Fly ash is rich in various valuable metal elements and has great application potential.In order to achieve comprehensive utilization of resources and environmental protection at the same time,people can use fly ash to enrich alumina and reduce to prepare Al-Si alloy.The carbothermic reduction method is an emerging method of extracting alumina from fly ash and preparing Al-Si alloy.This paper summarizes the advantages and disadvantages of extracting alumina from fly ash by acid method and alkali method,and then focuses on the thermodynamic analysis of the possible reactions in the reduction process and the influence of the addition of iron oxide on the reduction reaction.