提钒尾液回收硫酸钠、硫酸铵的研究

以某企业现场提钒尾液蒸发浓缩结晶物为原料,采用中温焙烧技术回收其中的硫酸钠、硫酸铵。中温焙烧主要采用闪蒸干燥一回转窑焙烧,使混合结晶物中的硫酸铵分解以获得纯度较高的硫酸钠。结果表明,闪蒸干燥后原料中水分可由20％降至1％;回转窑焙烧温度为400℃、焙烧时间为0．5h时,焙烧产物中硫酸铵含量可降至1％以下。回收所得硫酸钠可作为硫化钠生产原料;所得副产物氨气、二氧化硫和三氧化硫（少量）可制成硫酸铵返回钒氧化物沉淀工序使用。     

钒渣生产五氧化二钒实践

川威集团新建的五氧化二钒车间于2008年12月竣工投产,近半年的生产情况总的来说情况良好,整个工序生产顺畅,各项指标逐月攀升,产品质量稳定良好。     

Influence of silicon coating on the corrosion resistance of Zn-Al-Mg-RE-Si alloy

The electric arc spraying method was used to prepare the Zn-Al-Mg-RE-Si alloy coating with different content of silicon.The corrosion resisting property was measured by copper accelerated salt spray(CASS) and corrosion weightless test.The influence of silicon content on the corrosion resisting property was investigated by XRD,SEM,polarization curve and electrochemical impedance spectroscopy(EIS) and the electrochemical property of coating in the corrosion process was analyzed.The results showed that the density of coating was improved significantly since the major nonequilibrium glass-like state phase was composed of silicon and other metals existed in the Zn-Al-Mg-RE-Si alloy coating,which prevented the corrosive medium and retarded the corrosion velocity because of compact corrosion products in the corrosion embryo.The Zn-Al-Mg-RE-Si coating had better corrosion resistance than the Zn-Al-Mg-RE because of more positive potential,half corrosion current density and double electrochemical reaction resistance.     

炉外法冶炼高钒铁的工艺参数

 以V2O5为原料,铝粒为还原剂,采用炉外法还原制取了高钒铁,并对工艺参数进行了研究,达到了提高钒回收率的目的。研究结果表明,高钒铁的回收率随还原剂铝用量的增加而增大,其用量以过量2%(质量分数,下同)为宜。分别试验了3种不同的精炼剂(纯铝粒、铝硅铁合金和铝钙铁合金)对钒回收率的影响,发现以AlCaFe作为精炼剂,钒的回收率明显增加,是较好的精炼剂。铝热法生产高钒铁时,铝粒的合适粒度为3~4mm。     

V2O3原料系统中MFe走向研究及除铁措施

对Ｖ２Ｏ３原料系统中ＭＦｅ的来源及富集原因进行了分析,找出了影响除铁的因素,通过优化设备工艺参数和增加３＾＃振动筛使钒精渣中ＭＦｅ含量得以降低。     

浅析蒸汽对沉淀钒的影响

分析了蒸汽压力对沉淀APV质量的影响，并通过降低浸出液体积和进行二次洗涤等方法来解决蒸汽压力过低对沉淀APV中TV、S等成分的影响。