Durczak Karol, Pyzalski Michał, Brylewski Tomasz, Sujak Agnieszka
Department of Biosystems Engineering, Faculty of Environmental and Mechanical Engineering, Poznań University of Life Sciences, Wojska Polskiego 50 Street, 60-627 Poznan, Poland.
Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Cracow, Poland.
Materials (Basel). 2023 Sep 3;16(17):6052. doi: 10.3390/ma16176052.
In the presented study, ye'elimite-aluminate-calcium (YAC) cement was synthesized. Complete synthesis of crystalline phases was achieved at a temperature of 1300 °C, which is 150 °C lower than the temperature standardly used in the processes of obtaining calcium aluminate cements (CAC). The greatest amount of ye'elimite phase (Klein complex), roughly 87% by mass, was acquired utilizing a sulphur ion transporter derived from artificial dihydrate gypsum obtained in the flue gas desulphurization process (variation I). In the case of anhydrite, the amount of synthesized crystalline ye'elimite in the clinker was 67% by weight (variant II). Depending on the synthesis conditions in the clinkers, the quantity of obtained calcium aluminates (CA, CA, and CA) ranged from 20 to 40% by weight. Studies on the hydration process of YAC cement samples showed that the main products are hydrated calcium aluminates and dodecahydrate calcium alumino-sulphate. In sinters of YAC and OPC, no crystalline ettringite was observed. Hydration analysis of Chinese cement revealed the presence of crystalline ettringite and dodecahydrate calcium alumino-sulphate, as well as hydrated calcium silicates of the CSH type accompanied with pseudo-crystalline Al(OH). The obtained clinkers from variants I and II constitute a special binder, which, due to its phase composition after hydration, can be used in the construction of reactors for biogas production in eco-energy applications.
在本研究中，合成了ye'elimite-铝酸钙（YAC）水泥。在1300℃的温度下实现了晶相的完全合成，该温度比获得铝酸钙水泥（CAC）过程中通常使用的温度低150℃。利用烟道气脱硫过程中获得的人造二水石膏衍生的硫离子转运体，获得了最大量的ye'elimite相（Klein络合物），质量分数约为87%（变体I）。对于硬石膏，熟料中合成的结晶ye'elimite量为67%（重量）（变体II）。根据熟料中的合成条件，获得的铝酸钙（CA、CA和CA）的量按重量计在20%至40%之间。对YAC水泥样品水化过程的研究表明，主要产物是水化铝酸钙和十二水硫酸铝钙。在YAC和OPC的烧结体中，未观察到结晶钙矾石。对中国水泥的水化分析表明，存在结晶钙矾石和十二水硫酸铝钙，以及CSH型水化硅酸钙并伴有准结晶Al(OH)。从变体I和II获得的熟料构成一种特殊的粘结剂，由于其水化后的相组成，可用于生态能源应用中沼气生产反应器的建造。
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