Abstract CO2 mineralization is a technological solution to reduce anthropogenic CO2 emissions. It is more cost-effective to use industrial wastes as feedstock than natural minerals and eliminate some of the energy-consuming operations, to recover various value-added byproducts. In this study, hydroxycancrinite zeolite was synthesized by a solvent-free method during the carbonation of blast furnace slag (BFS) as the waste feedstock. The effects of various process factors such as the alkaline dosage, crystallization temperature, and crystallization batch time on the synthesis of hydroxycancrinite were systematically investigated. A well-crystallized spherical hydroxycancrinite was obtained by mixing with NaOH solid and then crystallizing at 100 °C for 4 h. The as-synthesized products were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscope, thermogravimetric analysis, and Brunauer-Emmett-Teller analysis. The results revealed that pure microspheres of hydroxycancrinites are obtained with a diameter of ∼1 μm and a surface area of 37.2 m2/g. Based on the material balance and preliminary economic evaluation, 361 kg CO2/t BFS can be stored by calcium and magnesium components, whereas almost all of the silicon and aluminum are recovered as value-added zeolites, which significantly improve the process economy.

中文翻译：

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高炉渣碳化过程中羟基钙沸石微球的无溶剂合成

摘要 CO2矿化是减少人为CO2排放的一种技术解决方案。使用工业废料作为原料比天然矿物更具成本效益，并消除一些耗能操作，回收各种增值副产品。在这项研究中，在高炉矿渣 (BFS) 作为废物原料的碳化过程中，通过无溶剂法合成了羟基钙沸石。系统研究了碱用量、结晶温度和结晶批次时间等各种工艺因素对羟基钙铝石合成的影响。通过与 NaOH 固体混合，然后在 100°C 下结晶 4 小时，获得了结晶良好的球形羟基钙质。合成产物通过 X 射线衍射表征，傅里叶变换红外光谱、扫描电子显微镜、热重分析和Brunauer-Emmett-Teller 分析。结果表明，获得了直径约为 1 μm、表面积为 37.2 m2/g 的纯羟基癌微球。根据物料平衡和初步经济评估，钙和镁组分可以储存361 kg CO2/t BFS，而几乎所有的硅和铝都作为增值沸石回收，这显着提高了工艺经济性。