Welcome to visit The Chinese Journal of Process Engineering, Today is

Chin. J. Process Eng. ›› 2017, Vol. 17 ›› Issue (4): 791-796.DOI: 10.12034/j.issn.1009-606X.216377

• Process & Technology • Previous Articles     Next Articles

Effect of Basicity on Precipitation and Growth of Magnetite Phase from Modified Molten Nickel Slag

Guozhou LI1,  Yingying SHEN1,2,  Yongbo MA1,  Yanyun ZHANG1,  Min CHEN2,  Xueyan DU1*   

  1. 1. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 
    2. School of Material and Metallurgy, Northeastern University, Shenyang, Liaoning 110819, China
  • Received:2016-12-19 Revised:2017-02-02 Online:2017-08-20 Published:2017-08-16

碱度对熔融改质镍渣中磁铁矿相析出长大的影响

李国洲1， 申莹莹1,2， 马泳波1， 张燕云1， 陈 敏2， 杜雪岩1*   

  1. 1. 兰州理工大学材料科学与工程学院，甘肃 兰州 730050 2. 东北大学材料与冶金学院，辽宁 沈阳 110819
  • 通讯作者: 杜雪岩 duxy@lut.cn
  • 基金资助:
    甘肃省科技重大专项计划;国家自然科学基金

PDF

Abstract: In order to recycle iron resources in nickel slag via modified molten oxidation used CaO as modifier under air atmosphere, the phase composition and microstructure of original and modified nickel slag, the distribution of elements was investigated, and the precipitation quantity and grain size of magnetite at various basicities were characterized, and the effect of basicity on the precipitation and growth in nickel slag were studied. The results showed that the iron element exists as fayalite and hortonolite. Fe, Ni, Co, Cu are simultaneously concentrated in magnetite phase during molten oxidation process In addition, the precipitation and growth of magnetite phase are affected significantly by slag basicity. When the basicity is about 0.6, iron is precipitated as magnetite with uniform distribution, and its precipitation quantity reaches a maximum value of 36.4%, the average size of larger than 50 ?m and distribution uniform.

Key words: nickel slag, basicity, magnetite, precipitation and growth

摘要： 为实现铁资源高效回收，以CaO为改质剂、空气为氧化剂，改质熔融氧化处理镍渣，分析了反应前后渣样的物相组成及组织形貌，考察了反应后氧化渣样中元素的分布情况，测定了不同碱度下磁铁矿相的结晶量和颗粒尺寸，分析了碱度对磁铁矿相析出长大过程的影响. 结果表明，原渣中的铁主要赋存于铁橄榄石相及铁镁橄榄石相中，改质可将渣中Fe, Ni, Co, Cu元素在磁铁矿相中富集，适宜的碱度有利于磁铁矿相析出与长大，碱度为0.6时渣中铁以磁铁矿相形式析出，呈颗粒状，结晶量最大，为36.4%，颗粒平均粒径大于50 ?m，分布较均匀.

关键词: 镍渣, 碱度, 磁铁矿相, 析出和长大