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Porosity development in anodes for primary aluminium production

机译：开发用于原铝的阳极中的孔隙率

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摘要

The development of porosity in green composite carbon materials 15 important for their chemical and physical properties in the baked state. In the Hall-Heroult process an unfavourable pore size distribution and structure is detrimental to the anode consumption. Pore development depends on the raw materials and on the paste production process. Pitch and coke particles must be distributed evenly and smaller partikles fitted into the voids between larger particles in order to obtain a homogeneous paste. If not, intraparticle porosity will increase, and the paste will contain a higher amount of trapped air and volatiles at the forming stage thus leading to excessive porosity development during baking. Anode consumption has mainly been addressed by studies of catalytic activity and little or no attention has been paid to structure and porosity, due to the complexity of the green state and a lack of good analytical methods.
机译：绿色复合碳材料15中的孔隙度的发展对其在烘烤状态下的化学和物理性质很重要。在霍尔-赫罗尔特方法中，不利的孔径分布和结构不利于阳极消耗。毛孔的形成取决于原材料和糊剂的生产过程。沥青和焦炭颗粒必须均匀分布，较小的颗粒装入较大颗粒之间的空隙中，以获得均匀的糊状物。如果不是这样，则颗粒内的孔隙率将增加，并且糊剂在成形阶段将包含大量的滞留空气和挥发物，从而导致在烘烤过程中产生过多的孔隙率。阳极消耗主要通过催化活性的研究来解决，由于生坯状态的复杂性和缺乏良好的分析方法，很少或根本没有注意结构和孔隙率。

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