Synergistic Regulation of Crystal Morphology and Particle Size of α-Hemihydrate Gypsum Under the Action of Malic Acid and Glycerol
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摘要:
利用脱硫石膏制备高附加值的高强度α-半水石膏是拓展其利用途径的重要策略，而晶体形貌和粒度又是影响α-半水石膏品质的重要因素。以甘油水溶液为反应介质，苹果酸为媒晶剂，深入考察了苹果酸添加量和甘油浓度对晶体形貌和粒度影响，结果发现苹果酸通过与α-半水石膏晶体表面的钙质点发生络合吸附的方式主要实现对晶体形貌的调控，甘油的主要作用在于对晶体粒度的控制，其影响不是通过甘油直接在晶体表面吸附或者影响苹果酸吸附实现的。最终通过调控苹果酸添加量和甘油浓度实现了对α-半水石膏晶体形貌和粒度的协同调控并制备出具有相似形貌不同粒度的晶体。当甘油浓度为45%、苹果酸加入量为37.09×10-4 mol·kg-1时，可以生成平均粒度为18 μm左右的晶体；当甘油浓度为75%、苹果酸加入量为18.54×10-4 mol·kg-1时，可以生成平均粒度为5 μm左右的晶体。
Abstract:The preparation of high-strength α-hemihydrate gypsum with high value-added is an important way to expand the utilization. The crystal morphology and particle size of α-hemihydrate gypsum are important factors affecting its mechanical strength. Here, we investigated in deep the influence of the malic acid addition and the glycerol concentration on the crystal morphology and particle size with the reaction medium of glycerol solution and the crystal modifier of malic acid. It was found that malic acid regulated the crystal morphology by complexing adsorption with the calcium sites on the surface of α-hemihydrate gypsum crystal. The main function of glycerol was to control the crystal size, which was not achieved by glycerol adsorption directly on the surface of the crystal or affecting the adsorption of malic acid. Finally, crystal morphology and particle size of α-hemihydrate gypsum were synergistically controlled by adjusting malic acid addition and glycerol concentration, and the crystals with similar morphology and different particle size were prepared. The crystals with average size of about 18 μm were prepared with the glycerol concentration of 45% and the malic acid addition of 37.09×10-4 mol·kg-1. Meanwhile, the crystals with average size of about 5 μm were generated with the glycerol concentration of 75% and the malic acid addition of 18.54×10-4 mol·kg-1.
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Key words:
- flue gas desulfurization gypsum /
- α-hemihydrate gypsum /
- glycerol /
- malic acid /
- particle size /
- morphology
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图 8 90 ℃下在含不同甘油浓度(%)、苹果酸添加量为14.83×10-4 mol/kg的甘油-水-氯化钠溶液中制备的α-半水石膏的平均长度、宽度和长径比
Figure 8.
表 1 脱硫石膏的元素含量 /%
Table 1. Element content of FGD gypsum
CaO SO3 H2O SiO2 Fe2O3 Al2O3 MgO PbO K2O Others 36.21 42.30 19.62 0.65 0.32 0.25 0.10 0.06 0.03 0.46 
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