4.7 Article

Separation of impurities aluminum and iron during pressure acid leaching of vanadium from stone

期刊

JOURNAL OF CLEANER PRODUCTION
卷 166, 期 -, 页码 1265-1273

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.08.144

关键词

Stone coal; Pressure acid leaching; Separation; Iron; Vanadium; Aluminum

资金

  1. National Natural Science Foundation of China [51404174, 51474162]
  2. Project in the National Science & Technology Pillar Program of China [2015BAB18801]

向作者/读者索取更多资源

During the extraction of vanadium from stone coal by pressure acid leaching, a large amount of aluminum and iron are dissolved along with vanadium, which increases the difficulties of purification and enrichment of the leaching solution. In this study, the separation of aluminum and iron from vanadium has been investigated. It was found that the leaching efficiencies of vanadium, aluminum, and iron reached 90.20%, 30.30%, and 5.73%, respectively, after leaching for 5 hat 190 degrees C under 2.0 MPa partial pressure of O-2 with 15 vol% sulfuric acid solution and 7 wt% potassium sulfate. Potassium sulfate assisted the growth of alunite crystals in the holes and cracks of muscovite particles that had formed since calcium sulfate crystals debonded after interfacial growth. This process strengthened the leaching of vanadium and aluminum from muscovite. Owing to a boost of local concentration of aluminum ions on the addition of potassium sulfate, the precipitation of aluminum ions increased. Meanwhile, ferric ions were precipitated as stable yavapaiite crystals. Thus, an effective separation of aluminum and iron from vanadium could be realized from their mineral source. (C) 2017 Elsevier Ltd. All rights reserved.

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