Nhiwatiwa Jonathan, Cromarty Robert
Department of Materials Science and Metallurgical Engineering, University of Pretoria, Pretoria 0002, South Africa.
Materials (Basel). 2022 Apr 15;15(8):2897. doi: 10.3390/ma15082897.
The submerged arc furnace (SAF) has become the equipment of choice to produce manganese ferro-alloy. Furnace operators aim to reduce the cost of production by better understanding the role played by the various raw materials involved in the process. Coke is one of the key raw materials fed into the SAF; it plays three key roles in electric furnaces: as a reducing agent, as a source of carbon found in the alloy, and as a resistive element facilitating heat generation in the furnace. The heat generated plays two key functions in the furnace: ensuring both the metal and the slag have a sufficient low viscosity, and providing the heat required to support endothermic reactions. This study investigated the ambient-temperature and high-temperature resistivity characteristics of coke made from single-source coals. The measurement of coke resistivity was performed using the Kelvin (four-point) technique. The results showed a statistically significant difference in mean resistivity between cokes made from different coals. It was observed that coke resistivity generally decreased with increasing temperatures. Raman spectroscopy showed that the structural order of coke changes with increasing temperature.
电弧炉已成为生产锰铁合金的首选设备。炉工旨在通过更好地理解该过程中各种原材料所起的作用来降低生产成本。焦炭是送入电弧炉的关键原材料之一；它在电炉中发挥三个关键作用：作为还原剂、作为合金中碳的来源以及作为促进炉内发热的电阻元件。产生的热量在炉内发挥两个关键作用：确保金属和炉渣都具有足够低的粘度，并提供支持吸热反应所需的热量。本研究调查了单源煤制成的焦炭在环境温度和高温下的电阻率特性。焦炭电阻率的测量采用开尔文（四点）技术进行。结果表明，不同煤制成的焦炭在平均电阻率上存在统计学上的显著差异。观察到焦炭电阻率通常随温度升高而降低。拉曼光谱表明，焦炭的结构有序度随温度升高而变化。
