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过程工程学报 ›› 2020, Vol. 20 ›› Issue (3): 338-346.DOI: 10.12034/j.issn.1009-606X.219220

• 过程与工艺 • 上一篇    下一篇

海绵钛中Fe, Ni和Cr杂质引入过程分析

盛 卓1,2*， 李开华1,2， 程晓哲1,2   

  1. 1. 钒钛资源综合利用国家重点实验室，四川 攀枝花 617000 2. 攀钢集团研究院有限公司，四川 攀枝花 617000
  • 收稿日期:2019-06-05 修回日期:2019-07-18 出版日期:2020-03-22 发布日期:2020-03-20
  • 通讯作者: 盛卓 shengzhuo89@126.com；928056618@qq.com
  • 基金资助:
    航空航天级钛金属制备技术研究与开发

Analysis of inflow process of Fe, Ni and Cr impurities in Ti sponge

Zhuo SHENG1,2*, Kaihua LI1,2, Xiaozhe CHENG1,2   

  1. 1. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua, Sichuan 617000, China 2. Pangang Group Research Institute Co., Ltd., Panzhihua, Sichuan 617000, China
  • Received:2019-06-05 Revised:2019-07-18 Online:2020-03-22 Published:2020-03-20

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摘要： 采用Kroll法，以TiCl4和液态金属镁制备海绵钛，对海绵钛分部位取样，对高Fe, Ni和Cr含量样品进行MLA检测，计算Ti?Mg?Fe, Ti?Mg?Ni和Ti?Mg?Cr三元系的混合焓，研究海绵钛中Fe, Ni和Cr杂质的来源及引入过程。结果表明，海绵钛中Fe, Ni和Cr杂质主要来自钢制(1Cr18Ni9Ti)反应容器，其引入经历了在液态金属镁中溶解和与海绵钛合金化两步。当海绵钛于反应器壁处生成后，其与以单质形式溶于液态金属镁中的Fe, Ni和Cr原子结合将杂质富集。采取反应容器镀膜处理、控制反应区温度、使用低杂质含量的液态金属镁、将海绵钛坨底部与边部分离等措施可有效降低海绵钛中杂质含量。

关键词: 海绵钛, Miedema模型, Fe杂质, Ni杂质, Cr杂质

Abstract: The impurity concentrations of Fe, Ni and Cr in Ti sponge determine its quality and application areas. In order to analysis the inflow process of Fe, Ni and Cr impurities in Ti sponge during Kroll process, the concentration distributions and enrich phases of impurities were investigated by testing the samples that taken from different parts of the Ti sponge mass, and the mixing enthalpies of Ti?Mg?Fe, Ti?Mg?Ni and Ti?Mg?Cr were calculated by Miedema model. The results indicated that the Fe, Ni and Cr impurities from the reactor which manufacture material was stainless steel (1Cr18Ni9Ti), and the inflow process could be divided into two step while TiCl4 was feeding: Fe, Ni and Cr atoms dissoluted in liquid Mg, alloying with Ti sponge for strong atomic force between Ti?Fe, Ti?Ni and Ti?Cr atoms. In order to obtain high quality Ti sponge which has lower impurities contents of Fe, Ni and Cr, following steps should be taken: coating the reactor inner surface with a titanium film, controlling the reaction temperature strictly, using lower Fe, Ni and Cr content liquid magnesium as raw material, separating the edge and bottom part of the Ti sponge mass.

Key words: Ti sponge, Miedema’s model, Fe impurity, Ni impurity, Cr impurity