| 摘要 |
PROBLEM TO BE SOLVED: To obtain artificial ceramic rocks capable of efficiently making a seaweed bed at a low cost only by being thrown from a ship into the sea. SOLUTION: A great number of ground concrete pieces having outsides coated with china clay 3 are combined or fine particles of reddish soil or ground concrete pieces are singly used or mixed and kneaded with china clay and a plurality of the kneaded materials 13 are combined to form lumps 1 and 11 having a great number of voids 4 and 11 on the circumference, which are fired at a ceramic formation temperature and solidified to make artificial ceramic rocks.
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