疏松型粉煤灰硫酸水热浸出法提取铝

以内蒙古某电厂疏松型粉煤灰为研究对象，采用硫酸水热浸出的方法提取粉煤灰中的铝，在分析粉煤灰成分、形貌和物相的基础上，研究浸出温度、浸出时间、硫酸浓度、硫酸用量工艺参数对铝提取率的影响，通过X射线衍射对浸出渣的物相进行表征。结果表明，在浸出温度为180 ℃、浸出时间为4 h、硫酸浓度(质量分数)为61%、硫酸用量为理论值的3倍的条件下浸出粉煤灰，铝的提取率可达88%以上。该工艺具有浸出温度低、硫酸浓度低、铝提取率较高等特点，对疏松型粉煤灰的开发利用具有实际意义。

Aluminium extraction from porous coal fly ash using #br# sulphuric acid by hydrothermal method

Taking porous coal fly ash of a power plant in Inner Mongolia as the research object, aluminum in porous coal fly ash was extracted using sulphuric acid by hydrothermal method. Based on the composition, morphology and phase analysis of coal ash, the effects of leaching temperature, leaching time, sulfuric acid concentration and dosage of sulfuric acid on the extraction efficiency of aluminum were studied. And the phases of leaching slag were characterized using X ray diffraction (XRD). The results showed that more than 88% of Al was extracted under suitable conditions in which the temperature was 180 ℃, the leaching time was 4 h, the sulfuric acid concentration was 61% and the dosage of sulfuric acid was 3 times than the theoretical value. The technique has the characteristics of low leaching temperature, low sulfuric acid concentration and high extraction rate of aluminum, and it has practical significance for the development and utilization of porous coal fly ash.