Multistage utilization process for the gradient-recovery of V, Fe, and Ti from vanadium-bearing converter slag
Multistage utilization process for the gradient-recovery of V, Fe, and Ti from vanadium-bearing converter slag
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从含钒转炉渣中梯度回收V、Fe、Ti的多级利用工艺
DOI：
10.1016/j.jhazmat.2017.04.060
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发表时间：
2017
影响因子：
13.6
通讯作者：
Bai Chenguang
中科院分区：
文献类型：
--
作者：
Xiang Junyi;Huang Qingyun;Lv Xuewei;Bai Chenguang
为从含钒转炉渣中充分回收有价金属，降低尾矿中钒、铬等有害元素的含量，开发了一种多阶段利用工艺。首次采用机械活化-钙化焙烧-酸浸工艺回收钒。这一过程产生了两个产品，即。含钒溶液可回收∼95%的钒和含铁31.85%、钛8.94%的钒尾矿。在理论计算和物理测试的基础上，分别采用煤基直接还原磁选法和盐酸浸取法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%；钛以二氧化钛的形式回收，产率为85~90%。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。
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.