Abstract：The process of oxidation roasting of vanadium slag with participation of limestone was studied. The effects of process parameter variation on leaching of vanadium slag and the relationship between those and the behavior of phase transformations were analyzed. The results show that the micro morphology of the roasted clinker generally presents the aggregation of the multiple phases under the experimental conditions in this paper, including thin or granular solid solution R2O3, molten or semi molten calcium metavanadate (Ca, Mg) (VO3)2 and calcium pyrovanadate (Ca, Mg)2V2O7, stripy pseudobrookite Fe2TiO5 and augite. The vanadium leaching ratio is increased with raising the roasting temperature and the CaO/V2O5 ratio and decreasing the heating rate. However, excessively high roasting temperature and CaO/V2O5 ratio, and excessively low heating rate enhance the reaction of silica and calcia to form Al1.77Ca0.88Si2.23O8 or Ca2SiO4, which are not favorable to the transformations and the leaching of vanadium. Appropriate roasting conditions are the roasting temperature at about 900℃, heating rate at 2-2.66℃/min and CaO/V2O5 ratio of 0.6.
付念新 张林 刘武汉 涂赣峰 隋智通. 钒渣添加石灰石氧化焙烧过程物相转化行为[J]. 过程工程学报, 2017, 17(2): 285-291.
FU Nian-xin ZHANG Lin LIU Wu-han TU Gan-feng SUI Zhi-tong. Behavior of Phase Transformations in Oxidation Roasting of Vanadium Slags with Participation of Limestone. Chin. J. Process Eng., 2017, 17(2): 285-291.
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2017, Vol. 17 
