Mitsui Minings & Melting Co., Ltd.

Kazuhide Miyazaki

Kiyomi Abe

Toyohide Uemura

Toshiteru Okada

Toshiyuki Sakai

Morimasa Sumida

Yasuo Kitamura

Katsuzo Nakaso

Michiaki Yamamoto

Hideki Nishihama

An active material for the positive electrode of a lead-accumulator and a lead-accumulator utilizing the active material are provided, the active material consisting of lead oxide as the principal component and at least one component selected from the group consisting of bismuth, bismuth compounds, thallium and thallium compounds as an additive which is effective to improve the energy utilization and the lifetime of the accumulator.

Lead-accumulator and active materials used therein

Anode active materials comprising amalgamated zinc powder for use in cells, which may well achieve inhibition of corrosion of zinc with a smallest possible amount of mercury, may be produced by a process comprising atomizing a molten zinc added with mercury to obtain pre-amalgamated zinc powder and bringing thus obtained powder, which is dispersed in a liquid, into contact with mercury or an amalgam to further amalgamate said pre-amalgamated zinc powder.

Process for the production of anode active materials for use in cells

An organic electrolyte cell comprising a light metal as the anode active material, and copper powder-added manganese dioxide as the cathode active material.

Organic electrolyte cells

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.

Treatment of manganese nodules

A process for the preparation of a catalyst for reducing nitrogen oxides, which comprises impregnating a heat-resistant carrier with at least one carboxylate of the iron group metals and copper, converting the impregnated metallic carboxylate to the metallic hydroxide and then reducing the metallic hydroxide to the metal thereby preparing the catalyst; and catalysts prepared by said process.

Catalyst for reducing nitrogen oxides

A process for adsorbing and removing nitrogen oxides from waste gases is disclosed, wherein nitrogen oxides are adsorbed in a layer packed with electrolytic manganese dioxide blocks and eluted with water or aqueous alkaline solution. The specific action of the adsorption agent used in said process is disclosed in detail.

Process for adsorbing and removing nitrogen oxides from waste gases

A multi-component catalyst composition prepared by combining (A) noble metal catalyst elements effective for oxidizing carbon monoxide and hydrocarbons with (B) catalyst elements effective for the same purpose but containing no noble metal. The multi-component catalyst composition is effective in purifying exhaust gases containing nitrogen oxides, carbon monoxide and hydrocarbons by converting these harmful components into harmless components.

Growing community of inventors

Takehara, Japan

Kazuhide Miyazaki