自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第43卷    第5期    总第213期    2012年5月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2012)05-1595-09
高铁铝土矿还原过程中的碱耗机理
胡文韬1,王化军1,孙传尧1, 2,季春伶1,何洋1,王翠玲1

(1.北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京,100083;
2.北京矿冶研究总院 矿物加工科学与技术国家重点实验室,北京,100070
)

摘 要: 采用化学分析,XRD,SEM和EDS等方法研究Na2O在产物中的分布及赋存状态,分析影响碱耗的因素和机理,有助于制定合理的工艺条件,降低成本和保护环境。从Na2CO3晶体的结构和能量变化角度研究熔融促进Na2O扩散的机理。研究结果表明:扩散损失的Na2O占总损失的87.76%,其中,43.60%属于固相扩散,56.40%属气相扩散。固相扩散量随物料与容器间的Na2O质量分数差的增加而显著提高,而气相扩散则不受到影响。还原性气氛增强、还原时间延长、温度升高以及物料含Fe2O3和Al2O3会导致Na2O扩散量增加。

 

关键字: 铝土矿;固相扩散;气相扩散;碱耗;直接还原

Alkali consumption mechanism on ferrous bauxite reduction process
HU Wen-tao1, WANG Hua-jun1, SUN Chuan-yao2, JI Chun-ling1, HE Yang1, WANG Cui-ling1

1. Key Laboratory of High Efficient Mining and Safety of Metal Mines, Ministry of Education,
University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining and Metallurgy,
 Beijing 100070, China

Abstract:Research methods such as chemical analysis, XRD, SEM and EDS were used to study Na2O distribution and existing form in products. It was beneficial to analyze factors and mechanism influencing alkali consumption to improve process conditions, reduce cost, and protect environment. The mechanism of diffusion accelerated by fusion was also investigated from the term of the structure of the crystal and the variation of the energy. The experimental results show that 87.76% of the Na2O loss is by diffusion. In the diffusion part, 43.60% is in solid (liquid) phase, and 56.40% is in gas phase. The Na2O mass fraction difference between raw-material mixture and crucible appreciably impacts solid (liquid) phase diffusion amount, but there is nothing to do with gas phase diffusion. In addition, the enhancing of reducing atmosphere, increasing time and temperature, and the existence of Fe2O3, Al2O3 made more Na2O loss.

 

Key words: bauxite; solid phase diffusion; gas phase diffusion; alkali consumption; direct reduction

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号