Mitsui Minings & Melting Co., Ltd.

Toshiteru Okada

Nobuyuki Imada

Kazuhide Miyazaki

Yasuo Kitamura

A water purifier consisting essentially of manganese dioxide particles having a 20 to 48 mesh size and macroscopic pores which are so large in size as to permit passage of water therethrough. The particles may have active sites of needle-like or columnar crystals of manganese dioxide on the surfaces thereof. A method for making such water purifier is also described.

Method of making macroporous manganese dioxide

Macroporous manganese dioxide water purifier

Valuable metals in manganese nodules have their solvent solubilities altered by forming an alkaline-manganese electric cell using manganese nodules as a cathode active material component and discharging the cell with a selected discharge load. Thus, the solvent extraction percentage for Mn in manganese nodules can be controlled to less than 60% and that for other valuable metals be elevated to at least 80% by selecting the discharge load properly.

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Takehara, Japan

Toshiteru Okada