石煤焙烧样循环加压酸浸提钒降杂研究  

Impurity Reduction and Vanadium Extraction by Circulating Pressure Acid Leaching from Roasted Stone Coal

作　　者：黄俊[1] 张一敏[1,2] 黄晶[1] 刘涛[1] 薛楠楠[1] 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北省页岩钒资源高效清洁利用工程技术研究中心,湖北武汉430081 [2]钒资源高效利用湖北省协同创新中心,湖北武汉430081

出　　处：《稀有金属》2017年第6期701-708,共8页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51474162,51404174);教育部科学技术研究项目(213025A)资助

摘　　要：以湖北通山石煤焙烧样为对象,考察了酸浸液循环前后加压浸出过程中钒、铁、铝、磷浸出行为,并从热力学的角度阐明了循环加压酸浸降杂机制。结果表明,当液固比1.5 ml·g^(-1),浸出时间120 min,釜内压力1.0 MPa,硫酸浓度12.5%(体积分数),一段循环浸出温度180℃,二段循环浸出温度150℃时,钒、铝、磷、铁浸出率分别为84.56%,32.74%,60.69%,5.83%,与硫酸浓度15%(体积分数)浸出温度180℃其他条件相同时未循环浸出相比,钒浸出率提高了2.43%,铝、磷、铁浸出率则分别降低了27.74%,22.51%,14.13%,硫酸用量降低了16.67%。石煤焙烧样加压浸出过程中,各矿物浸出难易顺序依次为:赤铁矿、明矾石、云母、磷灰石、方解石;相对于未循环加压浸出而言,循环加压浸出可实现云母的分段浸出,使得平衡余酸的矿物由明矾石、赤铁矿转变为云母、明矾石、赤铁矿,从而使得浸出液中余酸浓度更低,铁、铝含量更少。The leaching behaviors of V, A1, P, Fe during the non-circulating pressure acid leaching and the circulation pressure acid leaching of Tongshan roasted stone coal were investigated, then the impurity reduction mechanism during the pressure circulating acid leaching of vanadium was clarified through thermodynamics analysis. Result showed that, under these conditions which were liquid/sol- id ratio of 1.5 ml g-1 , leaching time of 120 min, pressure of l. 0 MPa, sulfuric acid concentration of 12.5% （ volume fraction） , the first stage leaching temperature of 180 ℃, the second stage leaching temperature of 150 ℃, the leaching efficiencies of V, AI, P, Fe were 84.56% , 32.74% , 60.69% , 5.83% , respectively. Compared with the non-circulating leaching for which the conditions were as follows： the sulfuric acid concentration of 15% （volume fraction） , the leaching temperature of 180 ℃ and the other conditions were as same as the former, the leaching efficiency of V increased by 2.43% , the leaching efficiencies of A1, P, Fe decreased by 27.74%, 22.51% , 14.13% , respectively, and the dosage of sulfuric acid decreased by 16.67%. In this process the sequences of leaching dif- ficult degree of these minerals were obtained as follows ： hematite 〉 alunite 〉 mica 〉 apatite 〉 calcite. Compared with the non-circulating pressure acid leaching of Mica with one stage, the circulating pressure acid leaching could make the mica be leached with more stages, which made the minerals balancing the residual sulfuric acid change from alunite, hematite to mica, alunite and hematite, and that was the key to reduce the residual sulfuric acid concentration and the Fe and AI content in the leachate.

关 键 词：加压酸浸 石煤焙烧样 热力学 循环 降杂 

分 类 号：TF841.3[冶金工程—有色金属冶金]