钒钛磁铁海砂矿低温快速直接还原新工艺  

A new process for rapid direct reduction by low temperature of marine placer containing vanadic titanomagnetite

作　　者：胡兵[1] 谢志诚 黄柱成[2] 易凌云[2] Hu Bing;Xie Zhicheng;Huang Zhucheng;Yi Lingyun(Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,Hunan;School of Minerals Processing&Bioengineering,Central South University,Changsha 410083,Hunan;School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,Hubei)

机构地区：[1]中冶长天国际工程有限责任公司,湖南长沙410205 [2]中南大学资源加工与生物工程学院,湖南长沙410083 [3]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《烧结球团》2020年第6期16-22,共7页Sintering and Pelletizing

基　　金：湖南省自然科学基金资助项目(2019JJ51007)。

摘　　要：钒、钛是重要的战略资源,其来源之一为储量巨大的海砂矿。本文以某典型钒钛磁铁海砂矿为研究对象,采用X射线衍射、扫描电镜和化学多元素分析等手段对该矿物的工艺矿物学特征进行研究,结合选择性低温快速直接还原理论,提出一种以生物质为还原剂,采用"预氧化—微波加热深还原—磨选"方法实现钒钛磁铁海砂矿中铁和钒钛选择性分离富集的新工艺。研究结果表明:在预氧化温度为1100℃、预氧化时间为90 min,n(C)/n(Fe)(摩尔比)为0.6,微波还原温度为1200℃,还原时间为60 min,还原剂为生物质的条件下,新工艺可获得金属化率为95.7%,铁回收率为97.4%,尾矿钒、钛回收率分别为91.2%和92.5%的分选效果。Vanadium and titanium are important strategic resources,and the marine placer with huge reserves is an important source of vanadium and titanium resources.A typical marine placer containing vanadium,titanium and magnetite is taken as the research object,and the technological mineralogical characteristics of the mineral are studied by means of X-ray diffraction,scanning electron microscopy and chemical multi-element analysis.Combined with the theory of selective rapid direct reduction,a new process adopting the method of"pre-oxidation-deep reduction by microwave heating-grinding"and taking biomass as reducing agent to achieve the selective separation and enrichment of iron and vanadium-titanium from marine placer containing vanadium,titanium and magnetite is created.The result shows:At the pre-oxidation temperature of 1100℃,pre-oxidation time of 90 min,n(C)/n(Fe)=0.6,microwave reduction temperature of 1200℃,reduction time of 60 min,biomass as reducing agent,the separation effects of metallization rate of 95.7%,iron recovery rate of 97.4%,vanadium recovery rate of 91.2%,titanium recovery rate of 92.5%can be obtained.

关 键 词：钒钛磁铁海砂矿 生物质 微波加热 选择性还原 低温快速直接还原 

分 类 号：TF55[冶金工程—钢铁冶金]