Lithium dihydrogenphosphate (LHP) needs to be dehydrated to be safely applied for the melt casting process to produce lithium iron phosphate (LFP). The dehydration reaction consists of several consecutive melting, oligomerization, and crystallization steps resulting in a solid product stuck to the reaction vessel at around 400°C. Here we applied an electrical shell‐heated rotary kiln containing grinding media (ball‐mill rotary‐kiln, BaMRoK) to dehydrate LHP at 400°C and recover the ground product without needing any extra processing. The bulk convective heat transfer coefficient of the kiln has been calculated in the presence of the grinding media and the temperature profile has been modelled using COMSOL Multiphysics. The kinetic model of the reaction from thermogravimetric analysis (TGA) and the thermal profile suggest that the dehydration reaction mostly happens on the internal surface of the BaMRoK wall.

中文翻译：

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球磨机回转窑（BaMRoK）反应器中磷酸二氢锂的脱水

磷酸二氢锂（LHP）需要进行脱水，以安全地用于熔融铸造过程中以生产磷酸锂铁（LFP）。脱水反应由几个连续的熔融，低聚和结晶步骤组成，导致固体产物在约400°C下粘附在反应容器上。在这里，我们使用了一个装有壳粉的电加热窑，其中装有研磨介质（球磨机回转窑，BaMRoK），可以在400°C下对LHP脱水，无需任何额外的处理就可以回收研磨的产品。窑的对流传热系数是在存在研磨介质的情况下计算得出的，并且温度曲线已使用COMSOL Multiphysics进行了建模。