Based on two considerations of making full use of the residual heat of vanadium slag and exploring a novel green vanadium extraction process, this article employs vanadium slag with high MgO content as raw material, blowing oxygen into the molten vanadium slag and using the residual heat of the vanadium slag to carry out high-temperature roasting experiments. XRD and SEM/EDS were used to characterize the phase evolution and morphology of vanadium slag with high MgO content during oxidation. The results show that at a high temperature of 1723 K, the trivalent vanadium in vanadium slag can be partly transformed into acid-soluble pentavalent vanadium. Titanium-bearing spinel was oxidized into a large amount of strip pseudobrookite Fe 2 TiO 5 . After oxidation, vanadium existed in the form of the solid solution of magnesium pyrovanadate (Mg, Mn, Ca) 2 V 2 O 7 . The leaching rate of roasted vanadium slag with high MgO content is significantly higher than that of industrial vanadium slag. With the increase of oxygen blowing time from 10 to 30 minutes, the leaching rate of roasted vanadium slag with high MgO content increases from 23.19 to 53.69 pct.

中文翻译：

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高MgO含量钒渣高温氧化机理

本文基于充分利用钒渣余热和探索新型绿色提钒工艺两方面的考虑，以高MgO含量的钒渣为原料，向熔融钒渣中通入氧气，利用钒渣的余热。钒渣进行高温焙烧实验。XRD和SEM/EDS用于表征氧化过程中高MgO含量钒渣的相演变和形貌。结果表明，在1723 K高温下，钒渣中的三价钒可部分转化为酸溶性五价钒。含钛尖晶石被氧化成大量条状假板钛矿Fe 2 TiO 5 。氧化后，钒以焦钒酸镁（Mg、Mn、Ca) 2 V 2 O 7 。高MgO含量的焙烧钒渣浸出率明显高于工业钒渣。随着吹氧时间从10分钟增加到30分钟，高MgO含量的焙烧钒渣浸出率从23.19%增加到53.69%。