MATERIALS FOR GROWING ALGAE AND ARTIFICIAL FISHING BANKS

摘要

Vitreous materials for growing algae from which ferric ions can be stably eluted over a long time while regulating the elution time to the desired period by controlling the particle size thereof; materials for growing algae prepared by molding the above-mentioned materials into porous ones; and artificial fishing banks involving these materials as at least a part of the same. These materials are characterized by containing as the major components from 15 to 50 %, on the weight basis, of SiO2, from 1 to 35 % of either or both of Na2O and K2O, from 30 to 70 % of B2O3, and from 1 to 40 % of either or both of FeO and Fe2O3 and ferric ions can be easily eluted therefrom owing to the elevated boron content thereof.