欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2017, Vol. 17 ›› Issue (6): 1195-1202.DOI: 10.12034/j.issn.1009-606X.217122

• 过程与工艺 • 上一篇    下一篇

硫酸钠作用下褐铁型红土矿选择性还原富集镍铁

卢 超, 董竟成, 李 博, 周世伟, 王 华, 魏永刚*     

  1. 省部共建复杂有色金属资源清洁利用国家重点实验室,昆明理工大学冶金与能源工程学院,云南 昆明 650093
  • 收稿日期:2017-02-06 修回日期:2017-04-10 出版日期:2017-12-20 发布日期:2017-12-05
  • 通讯作者: 魏永刚 weiygcp@aliyun.com
  • 基金资助:
    国家自然科学基金资助项目;国家自然科学基金资助项目;云南省中青年学术技术带头人后备人才项目

Selective Reduction and Enrichment of Nickel and Iron in Limonitic Laterite Ore with the Addition of Sodium Sulfate

Chao LU,  Jingcheng DONG,  Bo LI,  Shiwei ZHOU,  Hua WANG,  Yonggang WEI*     

  1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China
  • Received:2017-02-06 Revised:2017-04-10 Online:2017-12-20 Published:2017-12-05
  • Contact: Yonggang WEI weiygcp@aliyun.com

摘要: 以Na2SO4为添加剂,采用煤基还原?磁选工艺,对含Ni 1.17%和Fe 35.71%的褐铁型红土矿选择性还原富集镍铁的行为进行了研究. 结果表明,原矿中27.40%的镍以氧化物形式存在,69.35%的镍以硅酸盐形式存在;在还原温度1100℃、还原时间60 min、硫酸钠用量20%(?)、无烟煤用量8%(?)的最佳还原条件下,在200 mT的磁场强度下湿式磁选,可富集得到镍品位13.26%、镍回收率88.4%、铁品位67.34%、铁回收率14.71%的镍铁精矿,镍富集比达11.33. 红土镍矿还原过程中加入Na2SO4破坏了原矿中硅酸盐的结构,释放出其中的镍与铁,进一步生成FeS,抑制铁深度还原并降低了体系熔点,有利于金属离子传质,促进镍铁颗粒长大.

关键词: 红土镍矿, 硫酸钠, 还原焙烧, 镍铁

Abstract: The limonitic laterite ore containing 1.17% Ni and 35.71% Fe by the coal-based reduction?magnetic separation process was studied using sodium sulfate as additive. The results showed that nickel was mainly associated with oxides (27.40%) and silicates (69.35%) in ore. For a ferronickel content of 13.26% Ni and 67.34% Fe, nickel recovery rate of 88.40%, iron recovery rate of 14.71% could be obtained under the best conditions of reduction temperature 1100℃, reduction time 60 min, the mass fraction of additive 20% and reductant 8% by the application of a 200 mT magnetic field, the enrichment ratio of nickel reached 11.33. Addition of sodium sulfate destroys the silicate mineral structure, and the majority of nickel and iron is liberated from silicates, FeS could also be generated. The formation of FeS inhibits the reduction of iron, decreases the system melting point, intensifies the process of metal irons mass transfer and enhances ferronickel particles growth during the reduction of laterite.

Key words: laterite, sodium sulfate, reduction roasting, ferronickel