粉煤灰酸浸提铝试验条件的优化

 为优化酸浸法从粉煤灰中提取氧化铝的试验条件，提高酸溶过程浸出率，降低氟化物掺量，采用正交试验，对影响浸出率的各种因素进行研究。通过优化试验条件，提高铝的浸出率，大大降低环境污染。当溶出温度达沸腾硫酸浓度为12 mol/L固液比为1：3溶出时间为120 min、KF 和粉煤灰的质量比为4：100 时，铝的浸出率可达91.2%。在没有降低浸出率的前提下，有毒氟化物的掺量约减少一半。

Research on Optimized Experimental Conditions of Acid Leaching to Extract Alumina from Fly Ash

Acid leaching is used to extract alumina from fly ash with generally concentrated sulfuric acid as solvent and fluoride as co-solvent. This method has some problems such as low leaching rate, fluoride environmental pollution, etc. The factors influencing the leaching rate with orthogonal test method are studied in this paper. By optimizing the experimental conditions, not only is the leaching rate of aluminum improved but also the environmental pollution is reduced. The results show that when the temperature reaches the boiling temperature of the dissolution, the concentration of sulfuric acid is 12 mol/L, the solid-to-liquid ratio is 1:3, the elution time is 120 min, and m(KF):m(fly ash)=0.04, the leaching rate of aluminum can be up to 91.2%, and the toxic fluoride dosage is reduced by half in the same leaching rate.