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The present invention relates to a spirulina bead, a manufacturing method of the spirulina bead, a heavy metal adsorbent comprising the spirulina bead, and a rare-earth metal adsorbent comprising the spirulina bead; and to a chlorella bead, a manufacturing method of the chlorella bead, a heavy metal adsorbent comprising the chlorella bead, and a rare-earth metal adsorbent comprising the chlorella bead.(CC) Drop the spirulina extract solution into an alcohol coagulation bath to form a spirulina bead(BB) Dissolve the spirulina extract in an organic solvent to form a spirulina extract solution(AA) Form a spirulina extract(DD) Spirulina extract solution(EE) Alcohol coagulation bath(FF) Spirulina beadCOPYRIGHT KIPO 2015