镁蒸气在真空条件下的冷凝行为

Condensation behavior of magnesium vapor in vacuum

摘要:

稀有金属常用于镁合金的制造过程,金属镁冶炼通常采用硅热法,因炼镁过程处于真空状态,导致无法连续生产,有必要研究真空时镁蒸汽的冷凝行为,可以为连续炼镁工艺提供理论和技术支持。在真空条件不同挥发温度和温度梯度下镁蒸气的冷凝行为被研究,结果表明随着挥发温度的升高,冷凝初始点温度降低,且镁蒸气冷凝区域跨度增大,得到的金属镁冷凝产物颗粒粒径减小。当温度梯度固定时,挥发温度从1000℃升高至1200℃,镁蒸气的冷凝初始点温度为从400.1℃降低到344.7℃,镁冷凝区域长度从11.5cm增加至16cm,且镁蒸气冷凝颗粒粒径大小从68.33μm降低至24.60μm；当挥发温度固定时,温度梯度从30.23℃/cm升高至39.85℃/cm,镁冷凝区域长度从14cm降低至10cm,说明温度梯度增加,冷凝距离变短,对粒度大小影响较小。研究结果可用于指导金属镁连续生产过程或连续炼镁冷凝器的设计。

Abstract:

_{:Rare metals are commonly used in the manufacturing process of magnesium alloys, and the Pidgeon process is usually used for magnesium production, the production of magnesium is in vacuum, which resulting in discontinuous, it is necessary to study the condensation behavior of magnesium vapor in vacuum, which can provide theoretical support for continuous production. The condensation behavior of magnesium vapor at different volatilization temperatures and temperature gradients is studied. The results show that the increase of volatilization temperature, the initial condensation temperature decreases, the condensation region span of magnesium vapor increases, and the particle size of condensation products decreases. The volatilization temperature increased from 1000 ℃ to 1200 ℃, the initial condensation temperature of magnesium vapor decreased from 400.1 ℃ to 344.7 ℃, the span of magnesium condensation area increased from 11.5 cm to 16 cm, and the particle size of magnesium vapor condensation decreased from 68.33 μm to 24.60 μm. The temperature gradient increases, the span of condensation region becomes shorter, and has little effect on particle size. The research results can be used to guide the continuous production process of magnesium and the design of condenser for continuous magnesium production.}