Abstract
Aiming to make full use of three kinds of solid wastes from calcium carbide industry, this paper first investigated elements and mineral compounds of them through inductively coupled plasma and X-ray diffraction (XRD). The three solid waste samples, removed dust (RD), coke dust (CD) and purified dust (PD), have higher Ca/S molar ratios than conventional fuels such as coal. In particular, Ca/S molar ratio of PD unexpectedly achieved 28.05. Calcium in PD is present mainly in the form of calcium oxides, but little calcium carbonates, which was contrary to calcium in RD. In addition, the large proportion of fixed carbon in the samples CD and RD was amorphous carbon. Besides, three former dust samples were mixed at a specific ratio to obtain a new sample, mixed dust (MD), for further experiments as a reference of future industrial applications. Combining thermogravimetric system and Fourier transform infrared spectroscopy system helped to investigate the combustion process of all four samples in air atmosphere. Large amounts of reactive amorphous carbon identified by XRD desorb pollutants adsorbed in retorting process firstly and then help the samples RD, CD and MD ignite easily, which indicates they have potential to be fuels. Besides, the calcium oxide catalyzed the NOx formation during the combustion, which should be inhibited.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
