【摘要】 <正> 从石煤中提取五氧化二钒早在六十年代就进行了一系列试验工作,经十多年的探索和研究,我国已能从石煤中提取高纯五氧化二钒（V₂O₅>98%）,生产稳定,产品出口,国外已有报导。目前,含钒石煤已列为我国一种新类型钒矿资源。石煤提钒通常采用直接湿法冶金过程,即钠盐氧化焙烧—水浸出—酸沉粗钒—碱溶脱氨制精钒的工艺流程,其中钠盐氧化焙烧是提钒生产过程中的关键步骤。其主要化学反应包括氧化和钠化过程。反应简式如下:更多还原

【Abstract】 The oxidation states of V in the bone coal are determined, the result shows that it contains 96.7% of Ⅴ(Ⅲ) and 3.3% of Ⅴ(Ⅳ) and no Ⅴ(Ⅱ) or Ⅴ(Ⅴ) is found in the clay mineraly. The distribution of oxidation states of Ⅴ in the process of roasting is described in this paper. Below 500℃, the oxidation states of Ⅴ are mainly dependent upon organic substances in the mineral, but over 500~C, temperature is the most important factor. In experiments NaC1 has been used as the catalyst which increases the rate of oxidation of Ⅴ, and the latter is oxidated to form soluble vanadates. Roasting with salt plays a very important role in extracting Ⅴ from the bone coal. The best conditions for roasting are temperature range of 750-800℃ for two hours and mineral : salt=100:10 by weight. The method presented in this paper can provide reference for the manufacturing departments concerned.更多还原