摘要
提钒尾渣含铁、钒等有价元素,但因钠含量高,返高炉炼铁会带来潜在风险。为解决上述问题,分别研究了提钒尾渣湿法脱钠技术,还原焙烧—磁选分离技术及钠化还原—浸出—磁选分离技术。结果表明,采用氧化钙作为脱钠剂加压浸出,提钒尾渣脱钠率可达到80.5%;提钒尾渣800℃还原后,其中铁还原为磁铁矿,但结晶粒度小,磁选分离效果差,提高还原温度至1 200℃,铁继续还原为金属铁,并聚集长大,分离效果良好;提钒尾渣同时添加钠盐、煤粉还原可实现钒和铁的同时转化,再通过浸出、磁选可实现三者有效分离,其中钠盐可用钙盐部分替代。
The extracted vanadium tailings contain useful iron and vanadium, while they bring risk when it is used for iron-making process due to their high sodium content. To solve the problem, three methods such as leaching, reduction-magnetic separation and sodic reduction-leaching-magnetic separation to remove sodium had been studied. It is found out that pressure leaching with CaO can remove 80.5% of sodium from the tailing. When the tail is reduced at 800℃, iron is reduced into magnetite and hardly to be separated because of its tiny size. While the temperature is increased to 1200℃,the magnetite is further reduced into metallic iron and then aggregate, leading excellent separation effect. Reducing the extracted vanadium tailing with sodium salt and coal powder can obtain simultaneous transformation of iron and vanadium. Then after leaching and magnetic separating processes, iron, sodium and vanadium are separated efficiently. Besides, sodium salt can be partly replaced by calcium salt.
作者
曾冠武
郝建璋
Zeng Guanwu;Hao Jianzhang(Panzhihua Iron & Steel Research Institute Co. , Ltd. , Pangang Group, Paiizhihua 617000, Sichuan, China)
出处
《钢铁钒钛》
CAS
北大核心
2019年第1期78-82,104,共6页
Iron Steel Vanadium Titanium
关键词
提钒尾渣
脱钠
浸出
还原
磁选
extracted vanadium tailing
sodium desorption
leaching
reduction
magnetic separating
