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MgOHCl thermal decomposition kinetics

机译：MgOHCl热分解动力学

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摘要

Experiments to determine the kinetics of the thermal decomposition of MgOHCl were performed. It was found that the decomposition of MgOHCl commenced at 649 K, and it directly converted into MgO and HCl without undergoing any intermediate step. Decomposition vs time data showed that the thermal decomposition of MgOHCl was a first-order process with respect to the amount of MgOHCl remaining, and the mass transfer of the product HCl gas away from the interface was likely the rate-limiting step. It was also found that the time required to completely decompose MgOHCl into MgO, more than 20 minutes, at the operating temperatures of electrolytic magnesium production processes, 600 °C±50 °C, was significantly longer than the time required, less than 1 minute, to digest the solid magnesium chloride containing feed material into the molten salt electrolyte in these processes. Such delay in the decomposition would mean that any MgOHCl produced during heating and digestion of the feed would not be decomposed by the heat of the electrolyte and thus the persistent MgOHCl would dissolve into the molten salt electrolyte with potentially severe negative consequences on electrolysis cell operation.
机译：进行了确定MgOHCl热分解动力学的实验。发现MgOHCl的分解始于649 K，并且无需任何中间步骤即可直接转化为MgO和HCl。分解相对于时间的数据表明，相对于残留的MgOHCl量，MgOHCl的热分解是一阶过程，产物HCl气体从界面的传质很可能是限速步骤。还发现在电解镁生产过程的操作温度600°C±50°C下，将MgOHCl完全分解成MgO所需的时间超过20分钟，比所需的时间明显少于1分钟。在这些过程中，将含氯化镁的固体进料消化成熔融盐电解质。分解的这种延迟将意味着在进料的加热和消化过程中产生的任何MgOHCl都不会被电解质的热量分解，因此持久的MgOHCl会溶解在熔融盐电解质中，对电解槽的运行可能产生严重的负面影响。

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  • 来源
    《Metallurgical and Materials Transactions B》 |2005年第1期|153-157|共5页
  • 作者

    S. Kashani-Nejad; K. -W. Ng; R. Harris;

  • 作者单位

    the Department of Mining Metals and Materials Engineering McGill University H3A 2B2 Montreal PQ Canada;

    the Department of Mining Metals and Materials Engineering McGill University H3A 2B2 Montreal PQ Canada;

    the Department of Mining Metals and Materials Engineering McGill University H3A 2B2 Montreal PQ Canada;

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