煤气化粉煤灰酸浸工艺条件的研究

在常压、较低温度（≤100℃）下，开展了煤气化粉灰硫酸浸出工艺条件的研究。以煤气化粉煤灰中Al2O3的浸出率为主要考察指标，通过单因素条件实验和正交实验，分别考察了粉煤灰活化焙烧温度、酸浸反应温度、酸浸反应时间、硫酸溶液质量浓度、液固比等因素的变化对煤气化粉煤灰中Al2O3浸出率的影响。在无需活化焙烧、不使用助剂的条件下，确定较适宜的酸浸工艺条件为：酸浸反应温度95℃、酸浸反应时间5h、硫酸溶液质量浓度40％、液固比4．5：1；此条件下的重复实验表明煤气化粉煤灰中Al2O3的平均浸出率为94．87％。

Study on Technological Conditions of Sulfuric Acid Leaching of Coal Gasification Fly Ash

Under atmospheric pressure and low temperature （≤100 ℃） conditions, technological conditions of sulfuric acid leaching of Coal gasification fly ash have been researched in this paper. Using the leaching rate of alumina in the fly ash as the main index, the affection of the factors, such as roasting activation temperature, acid leaching temperature, acid leaching time, quality concentration of sulfuric acid solution, and liquid-solid ratio, on the leaching rate of alumina were investigated by single factor and orthogonal experiments. The results show that without roasting activation or using additives, the optimized acid leaching technological eonditions were as follows： acid leaching temperature 95℃, acid leaching time 5h, quality concentration of sulfuric acid solution 40%, liquidsolid ratio 4.5：1. Under the above conditions, repeated experiments show that the average leaching rate of alumina from coal gasification fly ash is 94.87%.