摘要
以钒铬渣钠化焙烧工艺得到的碱性钒铬浸出液为原料,分析了主要元素V、Cr及杂质Si、P的含量,探讨了铝盐对碱性条件下Si和P的去除机制,研究了·18H2O用量、pH值、反应温度、反应时间及陈化时间等因素对Si、P去除效果的影响。结果表明:在弱碱性条件下,铝盐沉淀法可有效去除钒铬溶液中的Si和P,除Si率达98%,除P率达92%,满足后续沉钒要求。最佳除杂工艺条件为:Al∶Si（mol）=1.2,pH值9.0,温度90℃,反应时间15 min,陈化时间1 h。除杂过程中V和Cr的损失均小于5%,且进入除杂渣中的V和Cr容易洗涤回收,净化后液经沉钒、煅烧,沉钒率大于98%,最终得到的粉状V2O5产品质量满足标准《YB/T 5304—2011》中99级要求。
Using the alkaline V-Cr solution obtained from sodium roasting of V-Cr slag as raw material,the contents of main elements like V and Cr,impurities such as Si and P in the solution were analyzed.The removal mechanisms of Si and P using aluminum salt in alkaline solution were discussed.The effects of Al2(dosage,pH value,reaction temperature and time,and rest time on the removal efficiency of Si and P were studied.The results show that 98%of Si and 92%of P can be effectively removed from the V-Cr solution using aluminum salt at low basic conditions,which satisfies requirements for the subsequent vanadium precipitation.The optimum test conditions are as follows:Al∶Si（molar ratio）=1.2,pH=9.0,90℃of temperature,15 min of reaction time,and 1 h of aging time.The loss of V and Cr are less than 5%in the purification process.Moreover,V and Cr in the slag of impurities removal can be easily washed and recycled.Through precipitation of the purified liquor and subsequent calcination of the precipitate,powdered product containing more than 99%ofthe standard requirements of YB/T5304—2011,can be obtained with precipitation rate of vanadium over 98%.
出处
《钢铁钒钛》
CAS
北大核心
2018年第3期12-16,共5页
Iron Steel Vanadium Titanium
关键词
提钒
钒铬溶液
除杂
铝盐沉淀法
vanadium extraction
solution containing vanadium and chromium
purification
aluminum salt precipitation process
