Effect of Phosphoric Acid on the Preparation of α-Hemihydrate Gypsum Using Hydrothermal Method
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Preparation of α-HH
2.3. Experimental Methods
2.3.1. XRD Test
2.3.2. Morphology Test
2.3.3. Infrared Spectrum Test
2.3.4. Determination of Water of Crystal Content
- —Water of crystallization content, %;
- —Mass of sample before calcination, g;
- —Mass of sample after calcination, g.
2.3.5. Physical and Mechanical Properties Test
3. Results and Discussion
3.1. X-ray Diffraction Analysis
3.2. Crystal Water Content
3.3. Infrared Analysis
3.4. Morphology Analysis
3.5. Water Consumption for Standard Consistency
3.6. Mechanical Properties
4. Conclusions
- (1)
- The presence of H3PO4 can accelerate the formation rate of the α-HH phase. The transition time of all gypsum to the α-HH phase can be shortened from 1.5 h to 0.5 h when only 0.2% H3PO4 was added.
- (2)
- The infrared test results showed that H3PO4 did not enter the α-HH lattice to form eutectic phosphorus solid solution. In addition, the presence of related calcium phosphate was not detected in α-HH, possibly due to the small amount of phosphate content leading to the small amount of calcium phosphate production.
- (3)
- The addition of H3PO4 can significantly affect the crystal shape of α-HH and significantly weaken the regulatory effect of citric acid on the crystal shape of α-HH, resulting in a significant increase in the aspect ratio of α-HH crystals. Moreover, the higher the H3PO4 content, the more significant the negative impact.
- (4)
- Due to the significant increase in the aspect ratio of α-HH caused by H3PO4, the standard consistency water consumption of α-HH gradually increased with the increase in H3PO4 content. Accordingly, the strength of the hardened body of α-HH gradually decreased. However, the prepared α-HH can still meet the requirements of α20 high-strength gypsum when the H3PO4 content was less than 0.4%.
- (5)
- It can be inferred from this study that the soluble P2O5 impurities present in phosphogypsum can effectively promote the rapid formation of the α-HH phase when phosphogypsum is used for hydrothermal preparation of high-strength gypsum, but it can have a significant negative effect on the crystal regulation of α-HH. Therefore, the screening of suitable crystallization agents to avoid the adverse effects of soluble P2O5 will be one of the focuses of future research in this field.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Zhang, J.; Wang, X.; Hou, P.; Jin, B.; Zhang, X.; Li, Z. Effect of Phosphoric Acid on the Preparation of α-Hemihydrate Gypsum Using Hydrothermal Method. Materials 2023, 16, 5878. https://doi.org/10.3390/ma16175878
Zhang J, Wang X, Hou P, Jin B, Zhang X, Li Z. Effect of Phosphoric Acid on the Preparation of α-Hemihydrate Gypsum Using Hydrothermal Method. Materials. 2023; 16(17):5878. https://doi.org/10.3390/ma16175878
Chicago/Turabian StyleZhang, Jianwu, Xiao Wang, Pengtao Hou, Biao Jin, Xiaoting Zhang, and Zhixin Li. 2023. "Effect of Phosphoric Acid on the Preparation of α-Hemihydrate Gypsum Using Hydrothermal Method" Materials 16, no. 17: 5878. https://doi.org/10.3390/ma16175878