1.physical properties

Storage: Store in an airtight and cool place

2.chemical properties
Manganese dioxide is the oxygen atom on the top of the octahedral corner, and the manganese atom in the octahedron. The [MnO2] octahedron is connected to form a single or double chain. The surface body is either hexagonal close-packed or cubic close-packed. Oxidation: Manganese dioxide is a non-salt-forming oxide, non-amphoteric oxide (neither reacts with acid nor alkali): it is oxidizing when it encounters a reducing agent. For example, manganese dioxide is heated to 1400K in a hydrogen stream to obtain manganese oxide; manganese dioxide is heated in an ammonia stream to obtain brown-black manganese trioxide; react manganese dioxide with concentrated hydrochloric acid to obtain 1 chlorine Manganese, chlorine and water.

In the case of strong oxidants, it also exhibits reducing properties. If manganese dioxide, potassium carbonate and potassium nitrate or potassium chlorate are mixed and melted, a dark green melt can be obtained, and the melt can be dissolved in water and cooled to obtain potassium manganate, a compound of hexavalent manganese. It is a strong oxidant in acid medium. Strong oxidant, does not burn by itself, but supports combustion, do not place it with flammables

3.main effect
Manganese dioxide is mainly used as a depolarizer in dry batteries. Manganese dioxide is also a very good decolorizing agent in the glass manufacturing industry. It can oxidize low-valent iron salts into high-iron salts and turn blue-green in glass into weak yellow. . In the electronics industry, it is used to make manganese-zinc ferrite magnetic materials. It is used as a raw material for iron-manganese alloys in the steel-making industry and as a heat-increasing agent in the casting industry. Absorbent acting on carbon monoxide in gas masks. In the chemical industry, it is used as an oxidant, a catalyst for organic synthesis, a drying agent for paints and inks. It is also used as a combustion accelerant in the match industry, as a raw material for ceramics, enamel glazes and manganese salts. It is also used in fireworks, water purification, iron removal, medicine, fertilizer and fabric printing and dyeing.

Manganese dioxide cannot react with dilute hydrochloric acid. The concentration of H+ and Cl- in concentrated hydrochloric acid is large and the reducibility is strong. Under heating conditions, it can be oxidized by MnO₂ to generate Cl₂; as the reaction progresses, the concentrations of H+ and Cl- gradually decrease. The reducibility gradually weakens, and when it reaches a certain level, MnO₂ can no longer oxidize Cl-. Therefore manganese dioxide and dilute hydrochloric acid do not react. In hot concentrated sulfuric acid, oxygen is released to form manganese sulfate. Co-melt with caustic soda and oxidant to form manganate. Soluble in acetone.

Electrolytic manganese dioxide is divided into ordinary type, alkaline manganese type and mercury-free alkaline manganese type. The ordinary type is suitable for zinc-manganese batteries; the alkaline manganese type is suitable for alkaline zinc-manganese batteries, and the mercury-free alkaline manganese type is suitable for alkaline zinc-manganese batteries. A manganese dioxide battery.

4.Application field
Electrolytic manganese dioxide is an excellent depolarizer for batteries. Compared with dry batteries produced by natural discharge manganese dioxide, it has the characteristics of large discharge capacity, strong activity, small size and long life. Therefore, electrolytic manganese dioxide becomes a battery A very important raw material for industry.

In addition to being the main raw material of batteries, electrolytic manganese dioxide in physical state is also widely used in other fields, such as: oxidant in fine chemical production process, raw material in manganese-zinc ferrite soft magnetic materials. Due to its strong catalysis, oxidation/reduction, ion exchange and adsorption capacity, electrolytic manganese dioxide is an excellent water purification filter material with comprehensive performance after treatment and molding. Compared with water filter media, it has stronger decolorization and metal removal ability.

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