Differential Precipitation of Mg(OH)2 from CaSO4·2H2O Using Citrate as Inhibitor—A Promising Concept for Reagent Recovery from MgSO4 Waste Streams
Abstract
:1. Introduction
2. Results
2.1. Effect of the Reaction Conditions on the Kinetics of the MgSO4 + Ca(OH)2 + 2H2O → Mg(OH)2 + CaSO4·2H2O Reaction
2.2. Analysis of the Precipitating Solids and the Effect of Washing
2.3. The Location of Citrate Ions after the Completion of both Precipitation Reactions
3. Conclusions
4. Materials and Methods
4.1. Materials
4.2. Preparation of Milk of Lime (MoL)
4.3. Performing the MgSO4 + Ca(OH)2 + 2H2O→ Mg(OH)2 + CaSO4·2H2O Reactions
4.4. Experimental Methods
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Temperature (°C) | Estimated Induction Time (min) | Half-Reaction Time (min) |
---|---|---|
20 | 10.3 | 22.8 |
22 | 9.1 | 21.5 |
24 | 6.8 | 17.5 |
26 | 5.8 | 15.7 |
Sample Taken after | Initial Reactant Concentration | ||
---|---|---|---|
0.1 M | 0.125 M | 0.15 M | |
1 min | No gypsum present | No gypsum present | Gypsum present |
5 min | - | Small amount of gypsum present | Gypsum present |
10 min | No gypsum present | Gypsum present | Gypsum present |
20 min | Gypsum present | Gypsum present | - |
Sample Availability: Samples of the compounds upon special request are available from the authors. | |
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Ziegenheim, S.; Szabados, M.; Kónya, Z.; Kukovecz, Á.; Pálinkó, I.; Sipos, P. Differential Precipitation of Mg(OH)2 from CaSO4·2H2O Using Citrate as Inhibitor—A Promising Concept for Reagent Recovery from MgSO4 Waste Streams. Molecules 2020, 25, 5012. https://doi.org/10.3390/molecules25215012
Ziegenheim S, Szabados M, Kónya Z, Kukovecz Á, Pálinkó I, Sipos P. Differential Precipitation of Mg(OH)2 from CaSO4·2H2O Using Citrate as Inhibitor—A Promising Concept for Reagent Recovery from MgSO4 Waste Streams. Molecules. 2020; 25(21):5012. https://doi.org/10.3390/molecules25215012
Chicago/Turabian StyleZiegenheim, Szilveszter, Márton Szabados, Zoltán Kónya, Ákos Kukovecz, István Pálinkó, and Pál Sipos. 2020. "Differential Precipitation of Mg(OH)2 from CaSO4·2H2O Using Citrate as Inhibitor—A Promising Concept for Reagent Recovery from MgSO4 Waste Streams" Molecules 25, no. 21: 5012. https://doi.org/10.3390/molecules25215012