CIESC Journal ›› 2016, Vol. 67 ›› Issue (S1): 296-301.doi: 10.11949/j.issn.0438-1157.20151808

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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. 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

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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

CLC Number: 

  • TQ177.372
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