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 ›› 2024, Vol. 56 ›› Issue (1): 114-120.doi: 10.19964/j.issn.1006-4990.2023-0141

• 环境·健康·安全 • 上一篇    下一篇

钛石膏中铁浸出动力学及其酸浸循环工艺研究

向梦琪1(), 孟华2(), 王烨1, 孟宪章3, 白宇航1, 王余军垚1, 张译丹1   

  1. 1.四川大学化学工程学院, 四川 成都 610065
    2.重庆化工职业学院, 重庆 400020
    3.攀钢冶金材料有限公司, 四川 攀枝花 617023
  • 收稿日期:2023-03-14 出版日期:2024-01-10 发布日期:2024-01-18
  • 通讯作者: 孟华(1984— ),女,教授,主要研究方向为生产过程优化与经济性分析;E-mail:mhua08@163.com
  • 作者简介:向梦琪(1999— ),女,在读硕士研究生,研究方向为钛石膏的资源化利用;E-mail:1131638127@qq.com
  • 基金资助:
    钛白石膏源头高值循环技术及经济性研究项目(KJQN202104502)

Study on kinetic of iron leaching from titanium gypsum and its cyclic acid leaching process

XIANG Mengqi1(), MENG Hua2(), WANG Ye1, MENG Xianzhang3, BAI Yuhang1, WANG Yujunyao1, ZHANG Yidan1   

  1. 1. College of Chemical Engineering,Sichuan University,Chengdu 610065,China
    2. Chongqing Vocational College of Chemical Technology,Chongqing 400020,China
    3. Panzhihua Steel Metallurgical Materials Co.,Ltd.,Panzhihua 617023,China
  • Received:2023-03-14 Published:2024-01-10 Online:2024-01-18

摘要:

硫酸法制备钛白粉的过程中产生了钛白废酸及钛石膏,采用以废治废思路,将钛白废酸作为浸取剂循环浸出钛石膏中的铁杂质,以实现资源的有效利用。研究了钛白废酸循环酸浸钛石膏的最优工艺条件,实验结果表明,在反应温度为333.15 K、液固质量比(以下简称液固比)为5∶1、反应时间为60 min、循环酸浸2次的条件下,钛石膏的除铁效率能达到80%以上。结合SEM、XRF、XRD等表征结果对比分析酸浸前后的钛石膏产品,结果发现酸浸条件能降低钛石膏中多种杂质组分含量,且酸浸前后钛石膏的物相组成均为CaSO4·2H2O。在上述研究的基础上形成了完整的钛石膏处理工艺,研究了在钛白废酸体系下,钛石膏中铁元素的浸出特性,并使用浸出动力学模型进行了拟合与计算,结果表明,该浸出过程受内部扩散控制,反应的表观活化能为59.08 kJ/mol。

关键词: 钛石膏, 钛白废酸, 浸出动力学, 活化能

Abstract:

During the process of preparing titanium dioxide powder using sulfuric acid method,titanium dioxide waste acid and titanium gypsum are generated.A waste treatment approach is adopted,using titanium dioxide waste acid as a leaching agent to recycle and leach iron impurities from titanium gypsum,in order to achieve effective utilization of resources.The optimum process conditions for the cyclic acid leaching of titanium gypsum with titanium white waste acid were investigated.The experimental results showed that the iron removal efficiency of titanium gypsum could reach more than 80% at reaction temperature of 333.15 K,liquid-to-solid mass ratio of 5∶1,reaction time of 60 min and two times of cyclic acid leaching.The titanium gypsum products before and after acid leaching were compared and analyzed based on SEM,XRF,XRD and other characterization results.The results showed that the acid leaching conditions could reduce the content of various impurity components in titanium gypsum,and the composition of the physical phase of titanium gypsum before and after acid leaching was CaSO4·2H2O.On the basis of the above research,the complete titanium gypsum treatment process was formed.The leaching characteristics of elemental iron in titanium gypsum under the titanium dioxide waste acid system were investigated,and fitted and calculated using a leaching kinetic model.The results showed that the leaching process was controlled by internal diffusion and the apparent activation energy of the reaction was 59.08 kJ/mol.

Key words: titanium gypsum, titanium dioxide waste acid, leaching kinetic, activation energy

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