Preparation of Low-Cost Magnesium Oxychloride Cement Using Magnesium Residue Byproducts from the Production of Lithium Carbonate from Salt Lakes
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Treatment Process of Magnesium Residues
2.3. Specimen Preparation
2.4. Analysis Method
2.4.1. Setting Time
2.4.2. Compressive Strength Analysis
2.4.3. Crystalline Phase and Microstructure
2.4.4. Pore Structure Test
2.4.5. Determination of Hydration Heat
3. Results and Discussion
3.1. Characterization of Magnesia by Calcination at Different Temperatures Chemical Composition
3.2. Micromorphology
3.3. Particle Size Distribution
3.4. Setting Time of MOC
3.5. Compressive Strength of MOC
3.6. Effect of the Magnesium Residue Calcination Temperature on the Hydration Products and Microstructure
3.7. Effect of the Magnesium Residue Calcination Temperature on MOC Porosity
4. Conclusions
- After different temperatures calcination, the main phase MgO content increases, and the Mg3B2O6 content are almost unchanged, whereas the Mg(OH)2 phase disappeared.
- The results show that with the increase of calcining temperature, the crystallization degree of magnesium residues increase, BET surface area decreased and reactivity with water of the calcined magnesium residue increased with increasing the calcination temperature. Therefore, with increased calcination temperature of magnesium residues, the setting time of the MOC cement is prolonged.
- The Baume degree of the magnesium chloride solution has an essential influence on MOC cement’s compressive strength. The calcination temperature is 800 °C, the molar ratio of magnesium oxide to magnesium chloride is 8.5, and the Baume degree of the magnesium chloride solution is 28, the compressive strength of MOC can reach 123.3 MPa after 28 d.
- Taking into account the regional characteristics of Qinghai, the use of the byproduct of extracting lithium carbonate from salt lakes to prepare MOC cement can save resources, protect the environment, and reduce the production cost of MOC, which is of great significance for the industrial production of MOC cement and the expansion of the application fields of MOC materials.
- Finally, it is not clear or not impurities (main Mg3B2O6) influence crystal defects and MOC formation. This requires further study. It can be studied by nanoindentation, atomic force microscopy, molecular dynamics simulation, and DFT calculation methods.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Composition | MgO | B2O3 | Na2O | SiO2 | Li2O | CaO | K2O | SO3 | Al2O3 | LOI |
---|---|---|---|---|---|---|---|---|---|---|
Content/% | 81.36 | 4.58 | 1.32 | 0.03 | 0.86 | 0.81 | 0.096 | 0.27 | 0.055 | 10.62 |
Composition | MgO | Mg(OH)2 | Mg3B2O6 |
---|---|---|---|
Content/% | 8 | 71 | 21 |
Temperature/°C | MgO | Mg(OH)2 | Mg3B2O6 | NaCl | Crystallite Dimensions/nm | R |
---|---|---|---|---|---|---|
0 | 39.04 | 42.32 | 18.08 | 0.56 | 66.2 | 12.36 |
400 | 65.53 | 15.48 | 18.59 | 0.40 | 29.8 | 13.59 |
500 | 79.04 | 1.60 | 18.80 | 0.55 | 34.8 | 8.93 |
600 | 80.92 | 0 | 18.50 | 0.58 | 45.6 | 9.27 |
700 | 83.10 | 0 | 16.05 | 0.84 | 52.7 | 9.16 |
800 | 82.89 | 0 | 16.17 | 0.94 | 62.2 | 10.58 |
Temperature/°C | Citric Acid Color-Changing Time/s | Active Magnesia Content/% | BET Surface/(m2/g) |
---|---|---|---|
400 | 51 | 56.6 | 27.8 |
500 | 73 | 68.4 | 27.5 |
600 | 94 | 71.3 | 26.3 |
700 | 151 | 73.0 | 18.6 |
800 | 196 | 70.0 | 8.9 |
Temperature/°C | Baume | 5·1·8 Phase | Mg(OH)2 | MgO | Mg2B2O5 | Rwp/% |
---|---|---|---|---|---|---|
500 | 24 | 76.53 | 8.79 | 2.40 | 12.28 | 10.05 |
28 | 70.81 | 7.72 | 9.48 | 11.98 | 10.40 | |
600 | 24 | 78.42 | 5.87 | 4.57 | 11.15 | 10.34 |
28 | 78.43 | 4.57 | 5.76 | 11.15 | 10.32 | |
700 | 24 | 77.73 | 8.37 | 3.12 | 10.77 | 10.44 |
28 | 67.40 | 9.65 | 9.93 | 11.98 | 10.22 | |
800 | 24 | 79.32 | 4.62 | 5.83 | 10.23 | 10.23 |
28 | 82.14 | 2.54 | 4.46 | 10.86 | 10.34 |
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Liu, P.; Dong, J.; Chang, C.; Zheng, W.; Liu, X.; Xiao, X.; Wen, J. Preparation of Low-Cost Magnesium Oxychloride Cement Using Magnesium Residue Byproducts from the Production of Lithium Carbonate from Salt Lakes. Materials 2021, 14, 3899. https://doi.org/10.3390/ma14143899
Liu P, Dong J, Chang C, Zheng W, Liu X, Xiao X, Wen J. Preparation of Low-Cost Magnesium Oxychloride Cement Using Magnesium Residue Byproducts from the Production of Lithium Carbonate from Salt Lakes. Materials. 2021; 14(14):3899. https://doi.org/10.3390/ma14143899
Chicago/Turabian StyleLiu, Pan, Jinmei Dong, Chenggong Chang, Weixin Zheng, Xiuquan Liu, Xueying Xiao, and Jing Wen. 2021. "Preparation of Low-Cost Magnesium Oxychloride Cement Using Magnesium Residue Byproducts from the Production of Lithium Carbonate from Salt Lakes" Materials 14, no. 14: 3899. https://doi.org/10.3390/ma14143899