Beryllium (Be) is mainly produced by magnesiothermic reduction of beryllium fluoride (BeF2). This research aims to improve the extraction rate of Be by investigating the reaction mechanism and kinetics during the magnesiothermic reduction of BeF2. It was found that the solid product layer composed of MgF2 and Be metal produced during the magnesiothermic reduction process is the main reason hindering the further improvement of the reduction rate. Kinetic study on the magnesiothermic reduction of BeF2 shows that it was controlled by volume diffusion. An apparent activation energy of 66.01 kJ/mol was obtained for the magnesiothermic reduction in the temperature range of 850–950 °C. Aiming to extract Be from BeF2 with a high efficiency, granular-shaped Mg (particle size 0.2–5 mm) and BeF2 powder (particle size < 0.83 mm) were used as raw materials for magnesiothermic reduction at 900 °C for 30 min, protected using Ar atmosphere. This was followed by further heating to 1300 °C and holding for 10 min, and the highest extraction rate of Be was achieved at 90.1 wt% with the Be purity of 94.2 wt%.

中文翻译：

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氟化铍的镁热还原反应机理和动力学研究


铍 （Be） 主要由氟化铍 （BeF2） 的镁热还原产生。本研究旨在通过研究 BeF2 镁热还原过程中的反应机理和动力学来提高 Be 的提取率。研究发现，镁热还原过程中产生的由 MgF2 和 Be 金属组成的固体产品层是阻碍还原率进一步提高的主要原因。BeF2 镁热还原的动力学研究表明，它受体积扩散控制。在 850–950 °C 的温度范围内，镁热还原获得了 66.01 kJ/mol 的表观活化能。 为了高效地从 BeF2 中提取 Be，以粒状 Mg（粒径 0.2–5 mm）和 BeF2 粉末（粒径 < 0.83 mm）为原料，在 900 °C 下氧化镁热还原 30 min，并使用 Ar 气氛保护。然后进一步加热至 1300 °C 并保持 10 分钟，在 90.1 wt% 时达到最高的 Be 提取率，Be 纯度为 94.2 wt%。