Al3+、Na+和Mg2+对二水硫酸钙结晶的影响

doi:10.11949/j.issn.0438-1157.20151808

化工学报 ›› 2016, Vol. 67 ›› Issue (S1): 296-301.DOI: 10.11949/j.issn.0438-1157.20151808

Al³⁺、Na⁺和Mg²⁺对二水硫酸钙结晶的影响

刘同海¹, 窦焰¹, 方羊¹, 崔鹏¹, 沈浩², 郑之银², 刘荣²

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

收稿日期:2015-12-01 修回日期:2015-12-11 出版日期:2016-08-31 发布日期:2016-08-31
通讯作者: 崔鹏,cuipeng@hfut.edu.cn

Influence of Al³⁺, Na⁺ and Mg²⁺ on crystallization of calcium sulfate dihydrate

LIU Tonghai¹, DOU Yan¹, FANG Yang¹, CUI Peng¹, SHEN Hao², ZHENG Zhiyin², LIU Rong²

1 School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;
2 Anhui Liuguo Chemical Co., Ltd., Tongling 244000, Anhui, China

Received:2015-12-01 Revised:2015-12-11 Online:2016-08-31 Published:2016-08-31

摘要/Abstract

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。

关键词: 反应, 结晶, 离子, 制备, 二水硫酸钙

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.

Key words: reaction, crystallization, ions, preparation, calcium sulfate dihydrate

中图分类号:

TQ177.372

刘同海, 窦焰, 方羊, 崔鹏, 沈浩, 郑之银, 刘荣. Al³⁺、Na⁺和Mg²⁺对二水硫酸钙结晶的影响[J]. 化工学报, 2016, 67(S1): 296-301.

LIU Tonghai, DOU Yan, FANG Yang, CUI Peng, SHEN Hao, ZHENG Zhiyin, LIU Rong. Influence of Al³⁺, Na⁺ and Mg²⁺ on crystallization of calcium sulfate dihydrate[J]. CIESC Journal, 2016, 67(S1): 296-301.

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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

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