Where is some manganese dioxide available for sale?

** on, 1688 on all have. Manganese dioxide. It is an inorganic compound with the chemical formula of MNO2, which is a black amorphous powder or black orthorhombic crystal, which is insoluble in water, weak acid, weak alkali and nitric acid.

Cold sulfuric acid, dissolved in concentrated hydrochloric acid when heated to produce chlorine gas.

It is used in the preparation of manganese salts, and is also used as an oxidizing agent and rust remover.

Preparation method: Mainly taken from the natural mineral pyromanganese. It is generally prepared by electrolysis of high-temperature manganese sulfate solution, and manganese carbonate and soft manganese ore can be used as raw materials.

The preparation of manganese sulfate solution includes leaching, iron removal, neutralization, heavy metal removal, filtration, static calcium and magnesium removal, etc., crude products are prepared after high-temperature electrolysis, and then qualified crystals are prepared by processing including stripping, crushing, washing, neutralization and drying.

When electrolysis of manganese chloride solution is used, fibrous manganese dioxide can be prepared. There are also manganese carbonate and manganese nitrate pyrolysis method, which consists of low-valent manganese oxide and oxidants such as sodium chlorate.

Chlorine, oxygen, etc. are prepared by direct oxidation by combined reactions.

Chemicals are generally sold in regular chemical reagent stores, and manganese dioxide seems to be quite expensive, more than 70 a bottle, a catty!

I now make it myself, a bottle of potassium permanganate 20, a catty, 500ml of hydrogen peroxide 30% As long as hydrogen peroxide is added to potassium permanganate, manganese dioxide will be generated, and potassium hydroxide and oxygen can also be obtained!

2kmno₄+3h₂o₂==== 2mno₂↓+2koh + 3o₂↑+2h₂o

The chemical store, where mine was bought.

Manganese dioxide, is an inorganic compoundThe chemical formula is MNO2, which is a black amorphous powder or black orthorhombic crystal, which is insoluble in water, weak acid, weak alkali, nitric acid, cold sulfuric acid, and dissolves in concentrated hydrochloric acid when heated to produce chlorine. It is used in the preparation of manganese salts, and is also used as an oxidant, rust remover, and catalyst.

Manganese dioxide is an amphoteric oxide that corresponds to a perovskite structure such as Bamno3 or Srmno3 (obtained by a combination reaction in a molten alkali system) and also manganese tetrachloride.

When the reducing agent is encountered, it is oxidizing. For example, manganese dioxide is heated to 1400K in a hydrogen gas stream to obtain manganese oxide; Manganese dioxide is heated in an ammonia gas stream to obtain brown-black manganese trioxide; Manganese dioxide is reacted with concentrated hydrochloric acid to obtain manganese chloride, chlorine gas and water.

Classification of inorganic compounds:

The vast majority of inorganic substances in nature can be classified into four categories: oxides, acids, alkalis and salts. The inorganic substances in living organisms mainly include water and some inorganic ions, such as Na+, K+, Ca2+, Mg2+, Cl-, So42-, etc.

Human tissues contain almost all kinds of elements that exist in nature, of which carbon, hydrogen, oxygen and nitrogen are mainly in the form of organic compounds, and the rest are collectively called inorganic substances (minerals or ash).

Therefore, the inorganic matter in the human body is mainly composed of: water and inorganic salts, of which water can be classified as: bound water and free water, bound water is an important component of cell structure, free water is a good solvent, transport substances, participate in chemical reactions.

Inorganic salts can be divided into: ions and compounds, ions are the maintenance of normal cell life activities, compounds are important components of intracellular compounds.

The above content refers to: Encyclopedia - Manganese Dioxide, Encyclopedia - Inorganic Compounds.

The manganese dioxide market is about 6,500 yuan per ton, which fluctuates with sellers.

Manganese dioxide is used as a depolarizing agent for dry batteries, a catalyst and oxidizer in the synthesis industry, a colorant, a decolorizer and a deironing agent in the glass industry and the enamel industry.

Manganese dioxide is used in the manufacture of manganese metal, special alloys, manganese iron castings, gas masks and electronic materials 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 Liangqiaobu catalyst in chemical experiments. Acorn spikes.

As of January 8, 2020Manganese dioxide. The ** is 20,000 a ton.

Manganese dioxide is an amphoteric oxide, which is a black powdered solid that is very stable at room temperature and can be used as a depolarizing agent for dry batteries. In the laboratory, it is often used for oxidation and concentrated HCl to produce chlorine gas.

The form is manganese dioxide black amorphous powder, or black orthorhombic crystal. Solubility: insoluble in water, weak acid, weak alkali, nitric acid.

Cold sulfuric acid, dissolved in concentrated hydrochloric acid when heated to produce chlorine gas.

Manganese dioxide (found in nature as pyrolite). A naturally occurring soft and hard manganese, a black insoluble crystalline compound, mixed with sulfuric acid can become a strong oxidizing agent. It can be used as a catalyst, a polarizing agent in some dry battery packs, and for fabric dyeing.

For example, manganese dioxide can be used to make oxygen, bleaching powder, manganese steel, glass, etc. 」

Chemical properties

Manganese dioxide is a [mno4] octahedral, oxygen atoms are on the top of the octahedral corner, manganese atoms are in the octahedron, [mno4] octahedral conlisal connection forms a single or double chain, these chains and other chains are co-topped, forming a void tunnel structure, octahedron or hexagonal dense packing, or forming a square dense packing.

Oxidation: Manganese dioxide is a non-salt oxide, non-amphoteric oxide (neither reacts with acids nor alkalis): when it encounters a reducing agent, it is oxidized.

For example, manganese dioxide is heated to 1400K in a hydrogen gas stream to obtain manganese oxide; Manganese dioxide is heated in an ammonia gas stream to obtain brown-black manganese trioxide; Manganese dioxide is reacted with concentrated hydrochloric acid to obtain l of manganese chloride, chlorine and water.

When encountering strong oxidants, it also behaves as reducing. 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 cooled in water to obtain potassium manganate, a compound of hexavalent manganese. It is a strong oxidizing agent in acid media.

Strong oxidant, does not burn by itself, but supports combustion, do not place it with flammable materials.

Analysis: Chlorine produced in the laboratory:

4HCl (concentrated) + MNO2 (MnCl2 + Cl2 cutaneous + 2H2O

MNO2 is an oxidizing agent, which acts as an oxidizing agent and is reduced.

Oxygen produced in the laboratory:

2kclo3 chain (mno2, ) 2kcl + 3o2 hail mold.

MNO2 is used as a catalyst.

2H2O2 (Mno2) 2H2O + O2 Mno2 is used as catalyst.

2kmNO4 (K2mNO4 + Mno2 + O2 Mno2 is the product (reduction product).

Black amorphous powder, or black orthorhombic crystal, insoluble in water, weak acid, weak alkali; Insoluble in water, nitric acid, cold sulfuric acid, soluble in hot concentrated hydrochloric acid to produce chlorine.

Used as an oxidizing agent. Catalyst. Desiccant. Determination of sodium sulfide in cement.

Inhalation of large amounts of nascent manganese oxide fumes can occur"Metal smoke heat"Dizziness, headache, nausea, chills, high fever, sore throat, cough, wheezing, etc. Long-term exposure may cause chronic manganese poisoning, with neurasthenic syndrome and autonomic nerve disorders in the initial stage, and neurosis that can continue to develop with obvious extrapyramidal damage.