Effects of impurity ions on coupled reaction-extraction-alcohol precipitation process of MgCl<sub>2</sub> and CO<sub>2</sub>

CHEN Guilan; SONG Xingfu; YU Jianguo

doi:10.11949/j.issn.0438-1157.20161259

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Effects of impurity ions on coupled reaction-extraction-alcohol precipitation process of MgCl₂ and CO₂

更新时间：2025-12-10

- Effects of impurity ions on coupled reaction-extraction-alcohol precipitation process of MgCl₂ and CO₂
- CIESC Journal Issue 2, Pages: 702-707(2017)
- 作者机构：
  
  化学工程联合国家重点实验室, 华东理工大学国家盐湖资源综合利用工程技术研究中心,上海,200237
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161259
  CLC： Q09
- Online First：05 February 2017，
  
  Published：05 February 2017
- 稿件说明：
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CHEN Guilan, SONG Xingfu, YU Jianguo. Effects of impurity ions on coupled reaction-extraction-alcohol precipitation process of MgCl₂ and CO₂[J]. CIESC Journal, 2017, (2): 702-707. DOI: 10.11949/j.issn.0438-1157.20161259.
DOI：

CHEN Guilan, SONG Xingfu, YU Jianguo. Effects of impurity ions on coupled reaction-extraction-alcohol precipitation process of MgCl₂ and CO₂[J]. CIESC Journal, 2017, (2): 702-707. DOI: 10.11949/j.issn.0438-1157.20161259. DOI：

摘要

通过反应-萃取-醇析耦合过程，将MgCl2和CO2制备成碳酸镁和氯化氢气体是盐湖老卤资源化利用的有效途径。系统地研究了老卤中Na+、K+、Ca2+对MgCl2和CO2反应-萃取-醇析耦合过程得到的固体产物晶型晶貌的影响。结果表明，Na+和K+对耦合过程的影响相似，固体产物均为高纯棒状三水碳酸镁（MgCO3·3H2O），且Na+和K+均能选择性吸附在MgCO3·3H2O晶体的轴面（101），阻碍该晶面的生长，使得棒状MgCO3·3H2O直径变小；Ca2+对反应-萃取-醇析耦合过程有不利的影响，由于CaCl2能参与反应，生成球状无定形纳米钙镁碳酸盐，使得三水碳酸镁纯度降低。

Abstract

The preparation of nesquehonite (MgCO3·3H2O) and hydrogen chloride by MgCl2 and CO2 based on a coupled reaction-extraction-alcohol precipitation process is an effective way for the comprehensive utilization of brine. The effects of impurity ions Na+

K+ and Ca2+ in brine on the morphology of the solid product obtained in the coupled reaction-extraction-alcohol precipitation process are investigated systematically. The results indicate that Na+ and K+ have a similar influence on the coupled process. The products are rod-like high purity MgCO3·3H2O when Na+ and K+ are added. Moreover

Na+ and K+ can be selectively absorbed onto the axial face (101) of MgCO3·3H2O

that will hinder the growth along the (1 0 1) direction and resulting a decrease in the diameter of MgCO3·3H2O. Ca2+ shows a negative effect on the coupled process. The added impurity CaCl2 can react with CO2 and form spherical amorphous nano Mg/Ca-carbonate

which will decrease the purity of the solid products.

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Effects of impurity ions on coupled reaction-extraction-alcohol precipitation process of MgCl2 and CO2

DOI：10.11949/j.issn.0438-1157.20161259

摘要

Abstract

关键词

Keywords

references

Effects of impurity ions on coupled reaction-extraction-alcohol precipitation process of MgCl₂ and CO₂