Selective Leaching of Vanadium from Roasted Stone Coal by Dilute Sulfuric Acid Dephosphorization-Two-Stage Pressure Acid Leaching
Selective Leaching of Vanadium from Roasted Stone Coal by Dilute Sulfuric Acid Dephosphorization-Two-Stage Pressure Acid Leaching
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稀硫酸脱磷-两级加压酸浸选择性浸出石煤钒
DOI：
10.3390/min6030075
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发表时间：
2016-07
期刊：
影响因子：
2.5
通讯作者：
Xue Nannan
中科院分区：
文献类型：
--
作者：
Huang Jun;Zhang Yimin;Huang Jing;Liu Tao;Cai Zhenlei;Xue Nannan
报道了一种从焙烧石煤中选择性提钒的分段浸出新工艺，并对其机理进行了探讨。结果表明，在稀硫酸脱磷-两段加压酸浸的最佳工艺条件下，钒、铝、磷和铁的浸出率分别为80.46%、12.24%、0.67%和3.12%。实现了V与Fe、Al、P的有效分离。由于磷灰石比云母更容易被浸出，所以磷灰石与硫酸反应完全，而云母在DSAD过程中几乎没有变化，这是实现V和P有效分离的关键。同样，通过降低渗滤液中的残酸，Fe和Al的水解比V更容易引发。在第一段PAL工艺中生成明矾石和铁-硫酸盐化合物，使V与Fe、Al有效分离。
A novel staged leaching process has been reported in this paper to selectively extract vanadium from roasted stone coal and the mechanisms have been clarified. Results showed that the leaching efficiency of V, Al, P and Fe was 80.46%, 12.24%, 0.67% and 3.12%, respectively, under the optimum dilute sulfuric acid dephosphorization (DSAD)-two-stage pressure acid leaching (PAL) conditions. The efficient separation of V from Fe, Al and P was realized. As apatite could be leached more easily than mica, the apatite could completely react with sulfuric acid, while the mica had almost no change in the DSAD process, which was the key aspect in realizing the effective separation of V from P. Similarly, the hydrolyzation of Fe and Al could be initiated more easily than that of V by decreasing the residual acid of leachate. The alunite and iron-sulphate compound generated in the first-stage PAL process resulted in the effective separation of V from Fe and Al.
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