Department of Mineral Processing, CSIR-IMMT, Bhubaneswar, Odisha 751013, India; Department of Chemical Engineering, IIT Bombay, Powai, Mumbai, Maharashtra 400076, India.
Department of Mineral Processing, CSIR-IMMT, Bhubaneswar, Odisha 751013, India.
Waste Manag. 2023 Jul 15;167:1-12. doi: 10.1016/j.wasman.2023.05.025. Epub 2023 May 23.
This work aims to perform the applied mineralogical characterization of coal gasification ash (CGA) generated from a commercial fixed bed downdraft gasification plant in eastern India. Analytical and characterization techniques such as stereomicroscopy, optical microscopy, field emission scanning electron microscopy (FESEM) with energy dispersive spectroscopy (EDS) attached, X-ray fluorescence (XRF), energy dispersive x-ray spectrometer associated scanning electron microscope (SEM-EDX), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) were applied for analyzing the coal and the corresponding gasification ash sample. These analytical techniques illustrate that SiO and AlO are the major gasification ash phases, accounting for almost 85% of the entire CGA composition. The dominant mineral phases, such as quartz, mullite, and other aluminosilicates, provide an opportunity for utilization in construction and refractory material manufacturing. Moreover, confirming the presence of rare and valuable earth elements (RVEEs) in the CGA sample with SEM-EDX analysis unearths a new application window in meeting the requirement of the RVEEs starved nation like India, where very few commercial-scale coal gasification units are operational.
本工作旨在对印度东部一座商业固定床下行气化厂产生的煤气化灰（CGA）进行应用矿物学特性分析。采用了立体显微镜、偏光显微镜、附有能量色散光谱仪（EDS）的场发射扫描电子显微镜（FESEM）、X 射线荧光（XRF）、与扫描电子显微镜（SEM）联用的能谱仪（EDX）、X 射线衍射（XRD）和热重分析（TGA）等分析和表征技术来分析煤和相应的气化灰样品。这些分析技术表明，SiO 和 AlO 是主要的气化灰相，几乎占整个 CGA 成分的 85%。主要的矿物相，如石英、莫来石和其他铝硅酸盐，为在建筑和耐火材料制造中利用提供了机会。此外，通过 SEM-EDX 分析确认 CGA 样品中存在稀有和有价值的地球元素（RVEEs），为满足像印度这样的 RVEE 短缺国家的需求开辟了一个新的应用窗口，印度只有少数商业规模的煤气化装置在运行。
