The carbothermal reduction of Al₂O₃ under primary vacuum using concentrated solar energy is a clean process for the production of energetic aluminum. However, undesirable by-products can be formed if the physico-chemical parameters (pressure, temperature) are not optimized. In the present work, the Sol@rmet reactor has been used to perform this reaction in the following pressure and temperature ranges, respectively, 280 to 880 Pa and in between 1800 and 2200 K. In particular, at total pressures lower than 400 Pa and at temperature around 2050–2150 K, collected powders with Al content higher than 90% have been obtained (maximum achieved Al yield close to 70%). It has also been shown that the use of a binding agent (in the reactants) and/or a change of the partial pressure of CO in the reactor could have a major influence on the formed Al/CO ratio. Finally, kinetic calculations on experiments performed at 380 Pa demonstrate that the phase boundary reaction and the nucleation process dominate the first stage of the carbothermal reduction of Al₂O₃.

中文翻译：

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聚光太阳能在低压下的碳热还原实验

Al ₂ O ₃的碳热还原在初级真空下，使用聚光太阳能是生产高能铝的清洁工艺。但是，如果未优化理化参数（压力，温度），则会形成不良副产物。在本工作中，Sol @ rmet反应器已被用于在以下压力和温度范围（分别为280至880 Pa和1800至2200 K之间）进行该反应。特别是在低于400 Pa和在2050–2150 K左右的温度下，已收集到的铝含量高于90％的粉末（获得的最大铝产量接近70％）。还已经表明，使用粘合剂（在反应物中）和/或改变反应器中CO的分压可以对所形成的Al / CO比率产生重大影响。最后，₂ O ₃。