Reigl, Selina and Van Driessche, Alexander E. S. and Wagner, Elisabeth and Montes-Hernandez, German and Mehringer, Johannes and Koltzenburg, Sebastian and Kunz, Werner and Kellermeier, Matthias (2023) Toward More Sustainable Hydraulic Binders: Controlling Calcium Sulfate Phase Selection via Specific Additives. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 11 (23). pp. 8450-8461. ISSN 2168-0485,
Full text not available from this repository. (Request a copy)Abstract
This work shows how additive-controlledcrystallizationmay be leveraged as an alternative route toward more sustainable productionof hydraulic binders. Bassanite (calcium sulfate hemihydrate) is one of themost extensivelyused inorganic binders in construction applications. Current industrialprocesses for the large-scale production of the mineral rely almostexclusively on the thermal dehydration of gypsum (calcium sulfatedihydrate), which consumes considerable amounts of energy. Here, weshow that phase-pure bassanite can be obtained in high quantitiesby spontaneous precipitation from supersaturated solutions at moderatetemperatures, where gypsum usually forms as a predominant solid phase.Key to control over phase selection is the presence of specific additivesduring crystallization, which carry functional groups for bindingonto calcium sulfate surfaces as well as additional moieties thatwithdraw water in the local microenvironment. Some of the investigatedadditives allowed bassanite to be recovered in large amounts at temperaturesas low as 40 degrees C and added concentrations of only 0.1 M or evenless. The concepts described in this work pave the way toward alternativeapproaches, enabling a less energy-intensive and thus more sustainableproduction of bassanite for use in construction and other appliedsystems.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GYPSUM; HEMIHYDRATE; BASSANITE; CRYSTALLIZATION; DEHYDRATION; STABILITY; HYDRATION; PLASTER; ACID; calcium sulfate; bassanite; hydraulic binders; additive-controlled crystallization; specific ion effects |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Mar 2024 13:33 |
| Last Modified: | 13 Mar 2024 13:33 |
| URI: | https://pred.uni-regensburg.de/id/eprint/59955 |
Actions (login required)
 |
View Item |
