粉煤灰酸法生产氧化铝过程中气体氧化剂氧化Fe^(2+)的动力学研究

Kinetic study on the oxidation of Fe^(2+)by gaseous oxidants in the process of producing alumina from fly ash using acid method

对粉煤灰酸法生产氧化铝浸出液进行化学成分分析,结果显示:浸出液中铝、铁为主要元素,以氯化铝计的铝质量浓度为263.5 g/L,以FeO计的总铁质量浓度为4.4 g/L,Fe^(2+)质量浓度为2.17 g/L。开展了空气、富氧气体、臭氧气体氧化Fe^(2+)的氧化反应动力学研究,得到了3种气体氧化剂氧化Fe^(2+)的动力学方程,对比了3种气体氧化剂的氧化速率,发现臭氧气体氧化速率是富氧气体的1.7倍,是空气的1.9倍。

A chemical composition analysis of the leachate in the process of producing alumina from fly ash using the acid method was conducted.Aluminum and iron were found to be the main elements in the leachate,with an aluminum concentration of 263.5 g/L(calculated as aluminum chloride)and a total iron concentration of 4.4 g/L(calculated as FeO),where the Fe^(2+)concentration was 2.17 g/L(calculated as FeO).A kinetic study on the oxidation of ferrous ions by air,oxygen-enriched gas,and ozone was carried out.Kinetic equations for the oxidation of ferrous ions by these 3 gaseous oxidants were obtained,and the oxidation rates were compared.The oxidation rate by ozone was found to be 1.7 times that of oxygen-enriched gas and 1.9 times that of air.