Comparison of microwave and conventional processing stainless steelmaking dust to prepare black ceramic pigments

作者：Li, Zhiqiao; Zhang, Xiang^*; Ma, Guojun; Muvunyi, Rodrigue Armel; Zheng, Dingli

来源：Journal of Ceramic Processing Research, 2022, 23(3): 344-349.

DOI：10.36410/jcpr.2022.23.3.344

• microwave processing
• stainless steelmaking dust
• black ceramic pigments
• transition metal element
• spinels

Using stainless steelmaking dust (SSD) for the preparation of black ceramic pigments can not only reduce pollution, but also have more considerable economic, environmental and social value. Black ceramic pigments with the mixed spinel-type were prepared from SSD by microwave and conventional processing, respectively. The properties of black ceramic pigments were studied by X-ray diffraction, Fourier transform infrared spectroscopy, Scanning electron microscope and Colorimeter. The results show that the main phase compositions of pigment sample synthesised by microwave processing are Fe3O4, FeCr2O4, NiFe2O4 and NiMn0.5Cr1.5O4. Compared with conventional processing, microwave processing can significantly reduce the required temperature of spinel formation reaction and promote the reaction. Moreover, the pigment sample prepared by microwave processing (PSM) is blacker and has a lower band gap than that prepared by conventional processing (PSC). The microstructure of PSM is regular polyhedral, and the crystal size of it is significantly larger than the PSC. In addition, the preparation process of PSM is more efficient and has a better application prospect compared with PSC.