某云母型含钒石煤氧压与常压酸浸提钒比较

湖北某地云母型含钒石煤中85%以上的钒赋存于云母类矿物中,V3+、V4+分别占总钒的70.83%、29.17%,V3+以类质同象取代云母晶格中的Al3+离子,常压酸浸极难释放出晶格中的钒。为了确定该矿石的高效、低耗、环保浸钒工艺及参数,以常压酸浸效果为参照,对氧压酸浸工艺条件进行了研究。结果表明,浸出温度、硫酸浓度以及氧分压的升高可显著提高钒浸出率,压力场的引入可大幅度提高钒浸出率、缩短反应时间、降低酸耗;在硫酸体积浓度为20%、浸出时间为5 h、反应温度为160℃、氧分压为0.5 MPa情况下的氧压酸浸,钒浸出率可达75.98%,较硫酸体积浓度为20%、浸出时间为5 h、反应温度为98℃情况下的常压酸浸钒浸出率高45.12个百分点。

Comparison of Atmosphere Pressure Acid Leaching and Oxygen Pressure Acid Leaching for Vanadium Extracting from Mica-type Stone Coal

Among a vanadium-bearing stone coal from Hubei province，more than 85% vanadium exists in mica minerals.V3+ and V4+ account for 70.83% and 29.17% of total vanadium respectively，in which V3+ replaces Al3+ as isomorphism in mica lattice which make vanadium hard to be released by direct acid leaching at atmosphere pressure.In order to find a high efficiency，low consumption，environmental friendly vanadium extracting process and parameters，by compared with atmosphere pressure acid leaching results，the oxygen pressure acid leaching process conditions were examined.The research results indicate that increasing leaching temperature，sulfuric volume concentration and oxygen partial pressure can significantly improve vanadium leaching efficiency，and introduction of pressure field can substantially raise vanadium leaching efficiency，shorten leaching time and reduce acid consumption.Vanadium leaching efficiency by oxygen pressure acid leaching reach 75.98% with sulfuric volume concentration of 20%，leaching for 5 h，leaching temperature at 160 ℃，oxygen partial pressure of 0.5 MPa，which is 45.12% higher than that of atmosphere pressure leaching at sulfuric volume concentration of 20%，leaching for 5 h and leaching temperature at 98 ℃.