热反应釜用于硫酸铵法粉煤灰提铝的可行性分析

Feasibility analysis of extracting alumina from fly ash in reaction kettle

根据硫酸铵法粉煤灰提取氧化铝的反应过程特性,提出利用热反应釜良好的反应气氛、均匀的反应温度、停留时间可控、粉煤灰颗粒度要求低等特点,研究热反应釜用于硫酸铵法粉煤灰提取氧化铝焙烧工艺的可行性。研究结果表明:使用热反应釜进行粉煤灰硫酸铵法提取氧化铝在工艺上可行,但此工艺因流态时间与物料反应时间存在矛盾关系,氧化铝提取率较低(在工艺可行的工况中,提取率最高为58.18%);总结了影响本工艺提取率的主要因素及规律(如硫酸铵质量比、反应时间、预混合、粉煤灰粒度等),这可以为硫酸铵法粉煤灰提取氧化铝焙烧工艺提供参考。

Reaction kettle had the advantages of uniform temperature,flexible standing time and better adaptability. Based on the reaction process characteristics of aluminium oxide extraction from fly ash by ammonium sulfate method,the feasibility of extracting alumina from fly ash in reaction kettle was studied.The results showed that,the method was feasibility,while the flow regime time was different from the reaction time among materials.The extraction efficiency of aluminium oxide was only 58.18%.The extraction efficiency was influenced by ammonium sulfate amount,reaction time,premixing and fly ash particle size.