东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (10): 1424-1429.DOI: 10.12068/j.issn.1005-3026.2019.10.011

• 材料与冶金 • 上一篇    下一篇

富高岭石型铝土矿化学脱硅新工艺及其机理

吴艳, 潘晓林, 韩月娇, 于海燕   

  1. (东北大学 冶金学院, 辽宁 沈阳110819)
  • 收稿日期:2018-10-19 修回日期:2018-10-19 出版日期:2019-10-15 发布日期:2019-10-10
  • 通讯作者: 吴艳
  • 作者简介:吴艳(1979-),女,辽宁朝阳人,东北大学讲师,博士; 于海燕(1967-),女,辽宁本溪人,东北大学教授.
  • 基金资助:
    国家自然科学基金资助项目(51774079,51674075,51204034); 中央高校基本科研业务费专项资金资助项目(N182508026).

Novel Process and Mechanism for Chemical Desilication from Kaolinite-Rich Diasporic Bauxite

WU Yan, PAN Xiao-lin, HAN Yue-jiao, YU Hai-yan   

  1. School of Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2018-10-19 Revised:2018-10-19 Online:2019-10-15 Published:2019-10-10
  • Contact: PAN Xiao-lin
  • About author:-
  • Supported by:
    -

摘要: 针对富高岭石型铝土矿,首次提出了采用化学脱硅的工艺路线.研究了二氧化硅平衡溶解度与氧化铝质量浓度的变化关系,以及碱液浓度、温度和脱硅时间对矿石预脱硅率的影响.结果表明,在Na2O质量浓度为230g·L-1的碱溶液中,90℃化学脱硅90min,脱硅率可达70%,铝土矿的铝硅比由4.97提高到8.5以上;矿石预脱硅过程有钠硅渣的生成,导致了矿石脱硅率的降低和碱的损失;矿石中高岭石转变成钠硅渣并不会降低脱硅精矿的有效铝硅比.

关键词: 铝土矿, 高岭石, 拜耳法, 化学脱硅, 钠硅渣

Abstract: For the kaolinite-rich diasporic bauxite, a process route using chemical desilication was firstly proposed. The relationship between the equilibrium solubility of silica and the mass concentration of alumina, and the effect of lye concentration, temperature and time on the chemical desiliconization ratio of ore were studied. The results showed that the desilication ratio can reach 70% and the w○Al▲2O▲3/w○SiO▲2 of bauxite increases from 4.97 to 8.5 in the alkali solution with Na2O concentration of 230g·L-1 at 90℃ for 90min. The formation of DSP reduces the pre-desilication ratio and causes the loss of alkali. However, the conversion of kaolinite to DSP does not reduce the effective w○Al▲2O▲3/w○SiO▲2 of desilicated concentrate.

Key words: bauxite, kaolinite, Bayer process, chemical desilication, DSP

中图分类号: