石煤提钒的最佳焙烧酸浸条件

Optimal Roasting and Leaching Conditions for Vanadium Extraction from Stone Coal

采用正交实验研究焙烧-硫酸浸出法从石煤中提取五氧化二钒的最佳条件。结果表明,硫酸浓度对浸出率影响高度显著,浸出率随酸浓度增加显著提高。焙烧温度对浸出率的影响也比较显著,适宜的焙烧温度为800℃。焙烧时间和浸出时间对浸出率有一定影响,与硫酸浓度和焙烧温度相比要小得多。石煤提钒的最佳浸出条件为硫酸的浓度20%,焙烧温度800℃,焙烧时间2h,浸出时间为2h,浸出温度90℃。

The optimal parameters for V2O5 extraction from stone coal with the technology of roasting-sulfuric acid leaching is investigated by orthogonal experiments. The results show that the leaching process is significantly influenced by the concentration of sulfuric acid, the leaching rate is remarkably increased with the increase of the concentration of sulfuric acid. And the leaching process is also significantly influenced by the roasting temperature, and the appropriate roasting temperature is 800℃ . The leaching rate is affected by the roasting time and leaching time in some extent, but much less than that of the concentration of sulfuric acid and the roasting temperature. The optimal condition of vanadium extraction from the stone coal is concentration of sulfuric acid 20%, roasting temperature 800℃, roasting time 2h, leaching time 2h, and leaching temperature 90℃.