Chemical properties of manganese dioxide MnO2 Manganese dioxide is the oxygen atom on the top of the octahedron, manganese atom in the octahedron, the [MnO2] octahedron is connected to form a single or double chain. The face may form a hexagonal dense product or a square dense product. Oxidizing: Manganese dioxide is a non-salt-forming oxide, non-amphoteric oxide (neither with acid nor with alkali): when it encounters reducing agents, it is oxidizing. For example, manganese dioxide is heated in a stream of hydrogen to 1400K to obtain manganese oxide; manganese dioxide is heated in a stream of ammonia to obtain brown-black manganese trioxide; the manganese dioxide is reacted with concentrated hydrochloric acid to obtain l chlorine Manganese, chlorine and water. When encountering strong oxidants, it is also reducible. 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 oxidizer, does not burn by itself, but supports combustion, do not put it together with flammable materials.
The main function of manganese dioxide MnO2 Manganese dioxide is mainly used as a depolarizing agent 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 the blue-green in the glass into weak yellow. Used in the electronics industry to make manganese-zinc ferrite magnetic materials. Used as a raw material for iron-manganese alloys in the steelmaking industry, and as a heat-increasing agent in the casting industry. An absorbent that acts on carbon monoxide in gas masks. In the chemical industry, it is used as an oxidant, a catalyst for organic synthesis, and a drying agent for paints and inks. It is also used as a combustion aid in the match industry, as a raw material for ceramics and enamel glazes and manganese salts. It is also used in fireworks, water purification and iron removal, medicine, fertilizer and textile printing and dyeing. Manganese dioxide cannot react with dilute hydrochloric acid. The concentration of H+ and Cl- in concentrated hydrochloric acid is large and has strong reducibility. It can be oxidized by MnO₂ under heating to form Cl₂; as the reaction progresses, the concentration of H+ and Cl- gradually decreases. The reducibility gradually weakens, and when it reaches a certain level, MnO₂ can no longer oxidize Cl-. Therefore, manganese dioxide and dilute hydrochloric acid will not react. Oxygen is released in hot concentrated sulfuric acid to form manganese sulfate. Co-melt with caustic soda and oxidant to form manganate. It is 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. A manganese dioxide battery.
Application fields of manganese dioxide MnO2 Electrolytic manganese dioxide is an excellent battery depolarizer. 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 used as the main raw material of batteries, physical electrolytic manganese dioxide has also been widely used in other fields, such as oxidizers in fine chemical production and raw materials in manganese-zinc ferrite soft magnetic materials. Electrolytic manganese dioxide has strong catalysis, oxidation / reduction, ion exchange and adsorption capacity. After treatment and molding, it is an excellent water purification filter material with comprehensive performance. Compared with water filter media, it has stronger decolorization and metal removal ability.
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