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Temperature-driven phase transformation of Ca-rich boron waste into CaB2O4: Investigation of microstructure, crystallinity and thermal characteristics
Materials Chemistry and Physics ( IF 4.3 ) Pub Date : 2022-05-18 , DOI: 10.1016/j.matchemphys.2022.126278
İremnur Ceylan , Buğra Çiçek

Large-scale mining and mineral processing, as well as increasing industrialization, generate a significant volume of boron wastes (BWs), necessitating waste recycling management. This research proposes a conceptual framework for circular production design based on the increased utilization of commercially valuable BWs including large amounts of B2O3, CaO, and MgO. In this study, BW is a non-calcined waste, whereas BW40, BW50, BW60 and BW90 are boron wastes calcined at 400 °C, 500 °C, 600 °C and 900 °C, respectively. Chemical, structural, thermal, and morphological characteristics and alterations depending on the calcination temperatures of BWs are investigated using XRF, XRD, FTIR, TG-DTA, and SEM techniques. BW which is non-calcined boron waste comprises Ca[B(OH)4]2.2H2O and HCaBO3 crystalline phases, whereas BW40 treated at 400 °C has HCaBO3 and CaCO3 crystalline phases as well as amorphous structure. CaCO3 and Ca2B2O5 crystalline phases and amorphous structure are present in the BW50 and BW60 samples, calcined at 500 and 600 °C. At 900 °C, all phases were transformed into Ca2B2O5 and CaB2O4 crystalline phases. We demonstrated that BW40, BW50, and BW60 have comparable chemistry and morphologies, but increasing calcination temperature to 900 °C resulted in a fundamentally different microstructure.



中文翻译:

富钙硼废料向 CaB2O4 的温度驱动相变:微观结构、结晶度和热特性研究

大规模采矿和矿物加工以及工业化程度的提高会产生大量的硼废物 (BW),因此需要进行废物回收管理。这项研究提出了一个循环生产设计的概念框架,该框架基于增加对具有商业价值的 BW 的利用,包括大量的 B 2 O 3、CaO 和 MgO。在本研究中,BW 是未经煅烧的废物,而 BW40、BW50、BW60 和 BW90 分别是在 400 °C、500 °C、600 °C 和 900 °C 下煅烧的硼废物。使用 XRF、XRD、FTIR、TG-DTA 和 SEM 技术研究了取决于 BW 煅烧温度的化学、结构、热和形态特征和变化。BW是未煅烧的硼废物,包含Ca[B(OH) 4] 2 .2H 2 O 和 HCaBO 3相,而在 400 °C 处理的 BW40 具有 HCaBO 3和 CaCO 3晶相以及无定形结构。CaCO 3和 Ca 2 B 2 O 5结晶相和无定形结构存在于 BW50 和 BW60 样品中,在 500 和 600 °C 下煅烧。在 900 °C 时,所有相都转化为 Ca 2 B 2 O 5和 CaB 2 O 4结晶相。我们证明了 BW40、BW50 和 BW60 具有可比的化学和形态,但将煅烧温度提高到 900 °C 会导致显着不同的微观结构。

更新日期:2022-05-18
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