化工进展 ›› 2022, Vol. 41 ›› Issue (7): 3957-3965.DOI: 10.16085/j.issn.1000-6613.2022-0099

• 资源与环境化工 • 上一篇    下一篇

氯盐体系下阳离子对脱硫石膏晶须水热结晶的影响及其机理

汪潇1(), 金彪1, 张小婷1, 张建武1, 王宇斌2, 苑冬冬1, 杨留栓1   

  1. 1.河南城建学院材料与化工学院,河南 平顶山 467036
    2.西安建筑科技大学资源工程学院,陕西 西安 710055
  • 收稿日期:2022-01-13 修回日期:2022-03-10 出版日期:2022-07-25 发布日期:2022-07-23
  • 通讯作者: 汪潇
  • 作者简介:汪潇(1975—),男,博士,副教授,研究方向为固体废物资源化利用。E-mail:wx407@126.com
  • 基金资助:
    国家自然科学基金面上项目(51674097);河南省重大公益专项(201300311000);河南城建学院工业副产石膏资源化创新团队资助项目(K-X2020020)

Effect of cation on hydrothermal crystallization of desulfurized gypsum whiskers in chloride system and its mechanism

WANG Xiao1(), JIN Biao1, ZHANG Xiaoting1, ZHANG Jianwu1, WANG Yubin2, YUAN Dongdong1, YANG Liushuan1   

  1. 1.School of Chemical & Material Engineering, Henan University of Urban Construction, Pingdingshan 467036, Henan, China
    2.School of Resources Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, Shaanxi, China
  • Received:2022-01-13 Revised:2022-03-10 Online:2022-07-25 Published:2022-07-23
  • Contact: WANG Xiao

摘要:

为探索阳离子对水热制备脱硫石膏晶须结晶调控的影响,本文以预处理后的脱硫石膏为原料,NaCl、CuCl2、AlCl3为添加剂采用水热法制备脱硫石膏晶须,重点研究Cl-存在条件下阳离子对脱硫石膏晶须结晶的影响及其作用机理。结果表明,Na+、Cu2+、Al3+对脱硫石膏晶须的显微结构、长径比和品质均有一定的影响,其中Cu2+影响最为显著。Cu2+可在晶须的(200)、(400)和(020)晶面发生化学吸附形成CuSO4膜层,使其径向生长受阻;同时,少量Cu2+可取代Ca2+,促进Ca2+的去溶剂化,使晶须长径比增大至200。Na+和Al3+均通过物理吸附作用于脱硫石膏晶须(200)、(400)和(020)晶面而阻碍其径向生长。此外,Al3+与溶液中的OH-通过羟基化反应生成Al(OH)2+和Al(OH)2+,吸附在带负电的(200)、(400)和(020)晶面,降低这些晶面的表面能,从而促进脱硫石膏晶须沿c轴生长。

关键词: 脱硫石膏, 氯盐体系, 晶须, 阳离子, 作用机理

Abstract:

Using pretreated desulfurized gypsum as raw material, and NaCl, CuCl2 and AlCl3 as additives, desulfurized gypsum whiskers were prepared by hydrothermal method in order to explore the effect of cations on their crystallization regulation. The study focused on the effect of cations on the crystal of desulfurized gypsum whiskers in the presence of Cl- and their mechanism. The results showed that Na+, Cu2+, Al3+ could affect the microstructure, aspect ratio and quality of desulfurized gypsum whiskers, but the effect of Cu2+ was more significant. Cu2+ could chemically adsorb on (200), (400) and (020) crystal faces of the crystal of whisker to form a CuSO4 film, which hindered its radial growth. At the same time, a little of Cu2+ could replace Ca2+, thereby promoting the desolvation of Ca2+, which caused an increase of the whisker aspect ratio to 200. However, both Na+ and Al3+ acted on (200), (400) and (020) crystal faces through physical adsorption and hindered the radial growth of desulfurized gypsum whiskers. In addition, Al3+ reacted with OH- in the solution to generate Al(OH)2+ and Al(OH)2+, and they were adsorbed on the (200), (400) and (020) planes with negative charges, which reduced surface energy of the above planes and also promoted the growth of desulfurized gypsum whiskers along the c-axis.

Key words: desulfurization gypsum, chloride system, whisker, cation, mechanism

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn