Abstract: In order to obtain the optimal conditions of vanadium extraction process by reburning and dilute sulfuric acid leaching of ash of stone coal, the factors affecting the vanadium leaching efficiency were experimentally studied. The results indicated that the reburning temperature, reburning time, particle size of clinker, leaching temperature and concentration of sulfuric acid have obvious influence on the vanadium leaching efficiency, and the ratio of liquid volume to solid mass (L/S) and leaching time affect less. The optimal conditions are obtained as follows: reburning temperature 850℃, reburning time 1 h, particle size of clinker less than 180 mm, leaching temperature 18℃ (room temperature), concentration of sulfuric acid 0.36 mol/L, L/S between 2~2.5 mL/g, and leaching time 15 min. At the conditions, the leaching efficiency of vanadium can reach more than 81%.

Key words: ash of stone coal, reburning, dilute sulfuric acid leaching, influential factor, vanadium, comprehensive utilization

摘要： 为获得石煤灰渣二次焙烧稀酸浸出提钒工艺的优化条件，对该工艺钒浸出率的影响因素进行了实验研究. 结果表明，二次焙烧温度、二次焙烧时间、熟料粒径、酸浸温度、硫酸浓度5种因素对钒浸出率的影响较大，酸浸液固体积质量比、酸浸时间的影响较小. 最佳工艺条件为：二次焙烧温度850℃，二次焙烧时间1 h，熟料粒径180 mm以下，常温(18℃)酸浸，硫酸浓度0.36 mol/L，液固比2~2.5 mL/g，浸出时间0.25 h. 在此条件下，石煤灰渣钒浸出率可达81%以上.

关键词: 石煤灰渣, 二次焙烧, 稀酸浸出, 影响因素, 钒, 综合利用