New Technology of Vanadium Extraction from Vanadium-bearing Steel Slag
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摘要: 含钒钢渣产生于钒钛磁铁矿的炼钢过程,可作为提取V2O5的重要原料。但由于其CaO和铁的含量高,钒含量低,目前回收利用难度很大。针对现有提钒工艺存在的问题和含钒钢渣的特点,自主开发出一种“选矿预处理、选择性分段浸出、萃取—洗涤—反萃”的选冶湿法提钒新工艺,并重点研究了选矿预处理、选择性分段浸出、净化与富集等工序,取得了较好的结果。新工艺钒总回收率达80%,与传统工艺从含钒固废中提钒时总回收率不足70%相比,指标大幅提升。新工艺取消了焙烧工序,突破了传统火法冶炼的局限,既消除焙烧污染、降低成本和投资,又提高浸出指标。新工艺使用的原料是废弃的含钒钢渣,属于废弃物的综合利用,对充分利用钒资源具有重要意义。Abstract: Vanadium-bearing steel slag,generated from the steelmaking process of vanadium-titanium magnetite,can be used as the raw material for preparation of V2O5.However,it is still very difficult to utilize the slag at present due to the high content of calcium oxide,iron and the low content of vanadium.In view of the problems of the existing vanadium extraction technologies and the characteristics of vanadium-bearing steel slag,a new technology for extracting vanadium from V-bearing steel slag through combined process of beneficiation and metallurgy has been developed,and emphatic study on the pretreatment by beneficiation,selective stage leaching,purification and enrichment was carried out.Finally,better results were achieved.Compared with total vanadium recovery of less than 70% when extracting vanadium from V-bearing solid waste by traditional processes,the index of vanadium extraction for the new technology is greatly improved with total vanadium recovery of 80%.And the new technology would have broad development potential due to the cancellation of the roasting process,which not only increases the leaching index,but also saves a lot of equipment investment and decreases the pollutants discharge.Moreover,raw material used in the new technology is vanadium-bearing steel slag rather than vanadium slag.Thus the new technology is one of the waste utilization technologies,having great significance in the full utilization of vanadium resources.
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