Aluminum-silicate cenospheres are the most valuable residue present in fly ashes after combusting stone coal. Cenospheres are hollow bodies with desirable engineering properties, such as hardness, low bulk density and complete chemical inertness, thanks to which they can be used in biomedical engineering. The following review presents data on obtaining and processing the material, as well as potential biomedical applications.

中文翻译：

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空心球及其在生物医学工程中的应用优势-系统综述

燃烧石煤后，硅酸铝空心球是飞灰中最有价值的残留物。空心球是具有期望的工程特性（例如硬度，低堆积密度和完全的化学惰性）的空心体，因此它们可以用于生物医学工程。以下评论介绍了有关材料的获取和加工以及潜在生物医学应用的数据。