粉煤灰硫酸法提铝的新工艺参数研究

Research on new technique parameters for aluminum extraction with fly ash sulfuric acid method

以高铝粉煤灰为原料,硫酸为浸取剂,通过对粉煤灰预处理、热酸浸、滤洗等工艺,制备出硫酸铝。试验表明,粉煤灰中的铝提取率随着活化方式、反应温度、时间、物料比等因素的变化而显著变化,试验获得了该反应的较优条件:酸灰比1:1.2,温度240℃,反应时间60 min,溶洗用水量为4倍体积,得到的硫酸铝的提取率可达80%以上。

Based on the high aluminum powder fly ash as the raw material and sulfuric acid as the leaching agent, with the pre-treatment, heat acid immersing, filtration and washing of the fly ash, aluminum sulfate was prepared. The experiment showed that the aluminum ex- traction rate from the fly ash would be in variation with the activation method, reaction temperature, time, material rate and other factor changed. The optimized conditions of the reaction obtained from the experiment were as the followings ： acid and fly ash rate ： 1 ： 1.2, temperature 240℃, reaction time 60 min, the dissolving and washing water quantity been 4 times of the volume. The extraction rate of the aluminum sulfate obtained could be over 80%.