Al3+、Na+和Mg2+对二水硫酸钙结晶的影响

刘同海; 窦焰; 方羊; 崔鹏; 沈浩; 郑之银; 刘荣

doi:10.11949/j.issn.0438-1157.20151808

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Al³⁺、Na⁺和Mg²⁺对二水硫酸钙结晶的影响

分离工程 | 更新时间：2025-12-10

- Al³⁺、Na⁺和Mg²⁺对二水硫酸钙结晶的影响
- Influence of Al³⁺, Na⁺ and Mg²⁺ on crystallization of calcium sulfate dihydrate
- 化工学报 2016年第S1期页码：296-301
- 作者机构：
  
  1. 合肥工业大学化学与化工学院,安徽,合肥,230009
  2. 安徽六国化工股份有限公司,安徽,铜陵,244000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151808
  中图分类号： Q177.372
- 网络首发：2016-08-31，
  
  纸质出版：2016-08-31
- 稿件说明：
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刘同海, 窦焰, 方羊, 等. Al³⁺、Na⁺和Mg²⁺对二水硫酸钙结晶的影响[J]. 化工学报, 2016,(S1):296-301. DOI: 10.11949/j.issn.0438-1157.20151808.

LIU Tonghai, DOU Yan, FANG Yang, et al. Influence of Al³⁺, Na⁺ and Mg²⁺ on crystallization of calcium sulfate dihydrate[J]. CIESC Journal, 2016, (S1): 296-301. DOI: 10.11949/j.issn.0438-1157.20151808.
刘同海, 窦焰, 方羊, 等. Al³⁺、Na⁺和Mg²⁺对二水硫酸钙结晶的影响[J]. 化工学报, 2016,(S1):296-301. DOI: 10.11949/j.issn.0438-1157.20151808. DOI：

LIU Tonghai, DOU Yan, FANG Yang, et al. Influence of Al³⁺, Na⁺ and Mg²⁺ on crystallization of calcium sulfate dihydrate[J]. CIESC Journal, 2016, (S1): 296-301. DOI: 10.11949/j.issn.0438-1157.20151808. DOI：

摘要

采用CaHPO4·2H2O-H2SO4-H3PO4-H2O体系模拟湿法磷酸生产过程，以磷矿浆成分为依据，在单因素条件下分别研究Al3+、Na+和Mg2+对结晶和CaSO4·2H2O水洗速率的影响。研究发现：添加Al3+有利于CaSO4·2H2O晶体粒径增加；添加Na+使得0.9% Na2O含量的Na+引起CaSO4·2H2O晶体团聚，有利于水洗；Mg2+增加溶液黏度，严重影响晶体生长和水洗速率。通过X射线衍射、扫描电子显微镜对CaSO4·2H2O进行表征，发现其晶体生长符合非完整光滑突变界面模型，杂质离子影响反应速率和晶面生长速度。

Abstract

The system

including CaHPO4·2H2O-H2SO4-H3PO4-H2O

is utilized to simulate wet process for phosphoric acid production. Based upon the slurry composition of phosphate mineral analysis

according to single factor experimental demands

the influence of Al3+

Na+and Mg2+ on crystallization and washing rate of CaSO4·2H2O were investigated. The result indicated that

it is beneficial for the size of CaSO4·2H2O crystals when adding Al3+into the system. Na+as the form of 0.9% (mass) Na2O in the slurry also caused agglomeration of CaSO4·2H2O crystals. We also found that it is helpful for the washing rate. But when Mg2+ was added into the system

the unfavorable impact such as increasing the viscosity of solution

seriously influencing crystal growth and washing rate. For our target production

CaSO4·2H2O crystal

XRD

SEM were adopted to characterize the products during the process. The results showed that crystal growth conforms to Burton-Cabrera-Frank model. The impurity ions change the reaction rate and crystal plane growth rate.

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