Synthesis of lansfordite under regulation of dicarbonate

SONG Xingfu; YANG Chen; WANG Jin; SUN Shuying; XU Yanxia; YU Jianguo

doi:10.11949/j.issn.0438-1157.20141032

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Synthesis of lansfordite under regulation of dicarbonate

更新时间：2025-12-10

- Synthesis of lansfordite under regulation of dicarbonate
- CIESC Journal Issue 1, Pages: 164-170(2015)
- 作者机构：
  
  1. 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
  2. 上海凯赛生物技术研发中心有限公司,上海,201203
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141032
  CLC： Q115
- Online First：05 January 2015，
  
  Published：05 January 2015
- 稿件说明：
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SONG Xingfu, YANG Chen, WANG Jin, et al. Synthesis of lansfordite under regulation of dicarbonate[J]. CIESC Journal, 2015, (1): 164-170.
DOI：

SONG Xingfu, YANG Chen, WANG Jin, et al. Synthesis of lansfordite under regulation of dicarbonate[J]. CIESC Journal, 2015, (1): 164-170. DOI： 10.11949/j.issn.0438-1157.20141032.

摘要

在NaHCO3调控作用下

通过MgCl2和Na2CO3反应结晶合成了五水碳酸镁(MgCO3·5H2O)。利用SEM、XRD和TG等技术

结合反应结晶过程中镁离子浓度变化

研究了工艺参数对结晶过程和产物影响。实验结果表明

合成五水碳酸镁过程中极易生成MgCO3·3H2O副产物。纯MgCO3·5H2O制备工艺条件为:NaHCO3加入量≥3.00 g·L-1

碳酸钠加料速率2～50 ml·min-1

合成温度0～5.0℃。所合成的五水碳酸镁呈棱柱状形貌

晶体表面光滑

尺寸20～160 μm。分析表明

添加碳酸氢钠促进了结晶动力学

同时基团对三水碳酸镁晶体的形成具有位阻效应

但有利于五水碳酸镁晶体形成

产生晶型调控的协同效果。工艺参数的改变将使得结晶过程发生热力学和动力学控制的转换

影响结晶产物的晶型晶貌。

Abstract

Lansfordite (MgCO3·5H2O) was synthesized via the reactive crystallization of MgCl2 with Na2CO3 under the regulation of NaHCO3. The effects of crystallization parameters on the crystallization process and products were experimentally investigated by means of SEM

XRD

TG techniques and taking into consideration the change of magnesium ion concentration during the crystallization process. MgCO3·3H2O was easy to generate as by-product in the synthesis process. Process conditions of pure MgCO3·5H2O preparation were as follows: NaHCO3 amount was ≥3.00 g·L-1

Na2CO3 feeding speed was 2—50 ml·min-1

reactive temperature was 0—5.0℃. The as-synthesized lansfordite crystals displayed prismatic morphology with smooth faces and a size of 20—160 μm. Analysis showed that crystallization kinetics was promoted with the addition of NaHCO3.?HCO3- group created the steric effect inhibiting nesquehonite growth but was beneficial for lansfordite crystallization. Therefore

pure lansfordite could be synthesized under the regulation of NaHCO3. Changes in process parameters could make the crystallization process shift between thermodynamic control and kinetic control

affecting crystal polymorph and morphology.

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