无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (12): 95-101.doi: 10.19964/j.issn.1006-4990.2023-0123

• 环境·健康·安全 • 上一篇    下一篇

预还原对含杂硫酸氧钛溶液水热水解除铁影响

彭秋桂1(), 杨帆2, 吕仁亮1,3(), 向兰2()   

  1. 1.武汉工程大学化工与制药学院, 绿色化工过程教育部重点实验室, 湖北 武汉 430205
    2.清华大学化学工程系, 北京 100084
    3.湖北三峡实验室, 湖北 宜昌 443007
  • 收稿日期:2023-03-09 出版日期:2023-12-10 发布日期:2023-12-14
  • 通讯作者: 吕仁亮,男,教授,研究方向为资源化工;E-mail:lyurenliang@wit.edu.cn
    向兰,女,教授,研究方向为无机材料化工;E-mail:xianglan@mail.tsinghua.edu.cn
  • 作者简介:彭秋桂(1998— ),女,硕士研究生,研究方向为材料与化工专业;E-mail:1293946031@qq.com
  • 基金资助:
    国家自然科学基金项目(52274410)

Effect of pre-reduction on deferrization in hydrothermal hydrolysis process of Mg/Al/Fe-bearing TiOSO4 solution

PENG Qiugui1(), YANG Fan2, LÜ Renliang1,3(), XIANG Lan2()   

  1. 1. School of Chemical Engineering & Pharmacy,Key Laboratory of Green Chemical Engineering Process of Ministry of;Education,Wuhan Institute of Technology,Wuhan 430205,China
    2. Department of Chemical Engineering,Tsinghua University,Beijing 100084,China
    3. Hubei Three Gorges Laboratory,Yichang 443007,China
  • Received:2023-03-09 Published:2023-12-10 Online:2023-12-14

摘要:

探究了向含镁、铝、铁杂质的硫酸氧钛溶液中加入铝粉,以此来改变部分元素价态的预还原处理方法对钛液水热水解除铁过程的影响。以电极电势理论为指导,将钛液中全部Fe(Ⅲ)还原为Fe(Ⅱ)、少量Ti(Ⅳ)还原为Ti(Ⅲ),随后在120 ℃下水热反应4 h。预还原及未预还原样品的钛水解率分别为98.59%和97.47%,水解产物中的铁含量分别为115 mg/kg和117 10 mg/kg(以TiO2计)。结合各反应在110~150 ℃下的热力学平衡常数与相关平衡方程,利用牛顿-拉弗森迭代法求解得到平衡体系在不同温度下的各组分浓度,阐明了预还原前后溶液中Mg、Al及Fe杂质在水热水解过程中的变化规律。实验与热力学相互印证,揭示了预还原对含杂硫酸氧钛溶液水热水解除铁过程的强化机制。

关键词: 预还原, 硫酸氧钛, 水热水解, 除铁, 水解率

Abstract:

The effect of pre-reduction treatment by adding aluminum powder to titanium oxysulfate solution containing magnesium,aluminum,and iron impurities and changing the valence of some elements on the process of iron removal from titanium liquid by hydrothermal hydrolysis was investigated.Under the guidance of electrode potential theory,all Fe(Ⅲ) in titanium liquid was reduced to Fe(Ⅱ),and a small amount of Ti(Ⅳ) was reduced to Ti(Ⅲ).Subsequently,hydrothermal reaction was conducted at 120 ℃ for 4 h.Titanium hydrolysis efficiency of samples with and without pre-reduction were 98.59% and 97.47%,and iron content in the hydrolysate was 115 mg/kg and 11 710 mg/kg(based on TiO2),respectively.Combining the thermodynamic equilibrium constant of each reaction at 110~150 ℃ with the relevant equilibrium equation,the concentration of each component in the equilibrium system at different temperatures was obtained by Newton-Raphson iterative method,and the change law of Mg,Al and Fe impurities in the solution with and without pre-reduction during the hydrothermal hydrolysis process was illustrated.The strengthening mechanism of pre-reduction on the deferrization in the hydrothermal hydrolysis process of titanium sulfate solution containing impurities was revealed through mutual verification of experiments and thermodynamics.

Key words: pre-reduction, titanyl sulfate, hydrothermal hydrolysis, deferrization, hydrolysis efficiency

中图分类号: