Synthesis and characterization of calcium aluminate compounds from gehlenite by high-temperature solid-state reaction
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Abstract
Abstract The mineral transition mechanism and self-pulverization property of the sintered products in the Ca 2 Al 2 SiO 7 -CaO system were systematically studied using pre-synthesized gehlenite determined by XRD, SEM, FTIR and particle size analyses. The minerals of Ca 12 Al 14 O 33 , CaAl 2 O 4 , Ca 3 SiO 5 and Ca 2 SiO 4 are formed by the direct reactions of Ca 2 Al 2 SiO 7 with CaO. CaAl 2 O 4 reacts with CaO to form Ca 12 Al 14 O 33 or Ca 3 Al 2 O 6 , while Ca 3 SiO 5 reacts with Ca 2 Al 2 SiO 7 to form Ca 2 SiO 4 and calcium aluminate compounds. The sintered products mainly contain CaAl 2 O 4 , Ca 12 Al 14 O 33 and Ca 2 SiO 4 at 1350 °C or above 1500 °C when the molar ratio of CaO to Al 2 O 3 is 1.0. Increasing the sintering duration or the CaO consumption promotes the transition of Ca 2 Al 2 SiO 7 to Ca 2 SiO 4 and calcium aluminate compounds when sintered at 1350 °C, which accordingly improves the self-pulverization property of the sintered products. The formed minerals of Ca 12 Al 14 O 33 , CaAl 2 O 4 and Ca 2 SiO 4 transform into Ca 2 Al 2 SiO 7 again when the sintering temperature is between 1400 °C and 1450 °C, and the corresponding self-pulverization property of the sintered products deteriorates sharply.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Nuclear materials and radiation effects · Glass properties and applications · Zeolite Catalysis and Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
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