School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
School of Materials and Metallurgical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
J Hazard Mater. 2017 Aug 15;336:1-7. doi: 10.1016/j.jhazmat.2017.04.060. Epub 2017 Apr 25.
A multistage utilization process was developed to fully recover valuable metals from vanadium-bearing converter slag and reduce the content of hazardous elements, such as vanadium and chromium, in the tailings. A mechanical activation-calcification roasting-acid leaching process was firstly employed to recover vanadium. This process generated two products, viz. a V-bearing solution accounting for ∼95% V recovery and vanadium tailings with Fe and Ti contents of 31.85% and 8.94%, respectively. Then, based on theoretical calculations and physical measurements, a coal-based direct reduction-magnetic separation process and a hydrochloric acid leaching process were employed for the stepwise recovery of iron and titanium, respectively, from the vanadium tailings. Iron was recovered in the form of high chromium-vanadium iron with 81.53% Fe, 1.31% Cr, and 2.04% V, and titanium was recovered as titanium dioxide pigment with 85-90% yield. Such a comprehensive and clean utilization of vanadium-bearing converter slag has great potential for practical application.
采用多阶段利用工艺从含钒转炉渣中充分回收有价金属，并降低尾矿中钒和铬等有害元素的含量。首先采用机械活化-钙化焙烧-酸浸工艺回收钒。该工艺生成了两种产物，即占约 95%钒回收率的含钒溶液和铁、钛含量分别为 31.85%和 8.94%的钒尾矿。然后，基于理论计算和物理测量，采用煤基直接还原-磁选工艺和盐酸浸出工艺，分别从钒尾矿中分步回收铁和钛。铁以高铬-钒铁的形式回收，铁含量为 81.53%，铬含量为 1.31%，钒含量为 2.04%，钛以 85-90%的收率回收为二氧化钛颜料。这种含钒转炉渣的综合清洁利用具有很大的实际应用潜力。
