2022 年 59 巻 6 号 p. 276-282
A granular soil conditioner with several millimeter diameters was prepared using scallop shell powder by pan granulator. The scallop shell powder was classified using a vibrating sieve to adjust the angle of repose for the granulation. As a result, the scallop shell granules with controlled size were prepared by adjusting the process parameters of the granulation such as the pan angle and the rotational speed. In addition, the amount of lignin (binder for the granulation) was adjusted to be 4 wt.% to attain the enough strength for the assumed compressive stress during the storage. Lastly the acidity correction of the obtained scallop shell granules had a low immediate effect and a high persistence compared with that of the scallop shell powder.
