Preparation method of manganese dioxide

Overview of manganese dioxide

Manganese dioxide is an inorganic compound with the chemical formula MnO2, which exists in nature in the form of pyrolusite. Physical properties: Black amorphous powder, or black rhombic crystals. Solubility: insoluble in water, weak acids, weak bases, nitric acid, and cold sulfuric acid. Heat and crush concentrated hydrochloric acid to generate chlorine gas.

MnO2 is a type of α Polycrystalline materials can combine various atoms (and water molecules) in the "tunnel" or "channel" between manganese oxide octahedra. People's attitudes towards α- MnO2 is of great interest as a potential positive electrode for lithium-ion batteries.

Preparation method of manganese dioxide

Mainly extracted from natural mineral pyrolusite. High temperature manganese sulfate solution electrolysis is commonly used for production, and both manganese carbonate and pyrolusite can be used as raw materials. The preparation of manganese sulfate solution includes processes such as leaching, iron removal, neutralization, heavy metal removal, filtration, and static removal of calcium and magnesium. After high-temperature electrolysis, crude products are prepared, and then processed to obtain qualified crystals through processes such as peeling, crushing, washing, neutralization, and drying. When using manganese chloride solution for electrolysis, fibrous manganese dioxide can be produced. There is also the thermal decomposition of manganese carbonate and manganese nitrate, which are obtained by direct oxidation of low-priced manganese oxide and oxidants such as sodium chlorate, chlorine gas, oxygen, etc.

The application of manganese dioxide

Used as a depolarizer for dry batteries, catalyst and oxidant in the synthesis industry, colorant, decolorizer, and iron remover in the glass and enamel industries. Used for manufacturing metal manganese, special alloys, manganese iron castings, gas masks, and electronic material ferrite. In addition, it can also be used in the rubber industry to increase the viscosity of rubber. It can also be used as a catalyst for chemical experiments.

Organic synthesis applications

Manganese dioxide is very useful in organic chemistry. The forms of manganese dioxide used for oxides vary. Due to the multiple crystal forms of manganese dioxide, its chemical formula can be written as MnO2 · x (H2O) n, where x is between 0 and 0.5, and n can be greater than 0. Potassium permanganate (KMnO ₄) reacts with manganese sulfate (MnSO ₄) at different pH values to produce manganese dioxide.

One of the special chemical reactions of manganese dioxide is to convert alcohols into aldehydes. Even if an alcohol has double bonds, it will not be oxidized by manganese dioxide: cis RCH=CHCH2OH+MnO2 → cis RCH=CHCHO+H2O+MnO The products inside will not be oxidized no matter how active they are. Glycols can be oxidized by manganese dioxide to form dialdehyde. Other manganese dioxide has many reactions and can be used for oxidizing amines, aromatics, and triols.

Laboratory use

Used as a catalyst for the decomposition of hydrogen peroxide to produce oxygen; Used as a catalyst for heating and decomposing potassium chlorate to produce oxygen; Aluminum thermite reacts with elemental aluminum powder to produce manganese. Used as pigment, yellow glass, etc; React with hot concentrated hydrochloric acid to generate chlorine gas; React with molten caustic potassium (potassium hydroxide) in the air to produce potassium manganese oxide; In the decomposition reaction of potassium permanganate, manganese dioxide is used as a high self catalyst for potassium permanganate.

Manganese dioxide price

The price of manganese dioxide will vary with random factors such as production costs, transportation costs, international situation, and supply and demand in the manganese dioxide market. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality and low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for manganese dioxide, please feel free to send an inquiry to obtain the latest prices for manganese dioxide.

Suppliers of manganese dioxide

As a global supplier of manganese dioxide, Tanji New Materials Co., Ltd. has rich experience in the performance, application, and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including chromium carbide, aluminum carbide, manganese dioxide, titanium carbide, etc.), high-purity target materials, functional ceramics, and structural devices, and provided OEM services.