In this study, the physicochemical, microstructural, mineralogical, thermal, and kinetic properties of three newly discovered coals from Akunza (AKZ), Ome (OME), and Shiga (SHG) in Nigeria were examined for potential energy recovery. Physicochemical analysis revealed high combustible but low levels of polluting elements. The higher heating values ranged from 18.65 MJ/kg (AKZ) to 26.59 MJ/kg (SHG). Microstructure and mineralogical analyses revealed particles with a rough texture, surface, and glassy lustre, which could be ascribed to metals, quartz, and kaolinite minerals. The major elements (C, O, Si, and Al), along with minor elements (Ca, Cu, Fe, K, Mg, S, and Ti) detected are associated with clays, salts, or the porphyrin constituents of coal. Thermal analysis showed mass loss (M_L) ranges from 30.51% to 87.57% and residual mass (R_M) from 12.44% to 69.49% under combustion (oxidative) and pyrolysis (non-oxidative) TGA conditions due to thermal degradation of organic matter and macerals (vitrinite, inertinite and liptinite). Kinetic analysis revealed the coals are highly reactive under the oxidative and non-oxidative conditions based on the Coats–Redfern Model. The activation energy (E_a) ranged from 23.81 to 89.56 kJ/mol, whereas the pre-exponential factor (k_o) was from 6.77 × 10^–4/min to 1.72 × 10³/min under pyrolysis and combustion conditions. In conclusion, the coals are practical feedstocks for either energy recovery or industrial applications.

在这项研究中，研究了三种新发现的尼日利亚阿肯萨（AKZ），青梅（OME）和滋贺（SHG）煤的物理化学，微观结构，矿物学，热学和动力学性质，以研究其潜在的能量回收。物化分析表明，可燃物含量高，但污染物含量低。较高的发热量范围为18.65 MJ / kg（AKZ）至26.59 MJ / kg（SHG）。微观结构和矿物学分析显示，颗粒具有粗糙的质地，表面和玻璃光泽，这可能归因于金属，石英和高岭石矿物。检测到的主要元素（C，O，Si和Al）以及次要元素（Ca，Cu，Fe，K，Mg，S和Ti）与粘土，盐或煤的卟啉成分有关。热分析表明质量损失（M _L）在TGA燃烧（氧化）和热解（非氧化）条件下由于有机物和黄铁矿（镜质体，惰质体和锂质陶土的热降解）在30.51％至87.57％的范围内，残余质量（R _M）在12.44％至69.49％的范围内）。动力学分析表明，基于Coats-Redfern模型，煤在氧化和非氧化条件下均具有高反应活性。在热解和燃烧条件下，活化能（E _a）为23.81至89.56 kJ / mol，而指数前因子（k _o）为6.77×10 ^–4 / min至1.72×10 ³ / min。总之，煤是用于能源回收或工业应用的实用原料。