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By lql | 09 February 2023 | 0 Comments

What chemical substance is chromium oxide?

What is chromium oxide
Chrome oxide is an oxide of chromium element, which is a black solid at normal temperature and pressure. The molecular formula is CrO2, the molecular weight is 83.9949, and it is mainly used to manufacture chromium dioxide magnetic powder.
Manufacturing method of chromium oxide powder
1.Reduction method: 99.5% potassium dichromate and 98% sulfur are mixed according to the mass ratio of 7:1 and then roasted to produce chromium oxide and potassium sulfate. After the reaction, the furnace charge is wet ground, then put into a washing tank with a stirrer to be washed with hot water, and the chromium oxide is filtered out by a filter press to obtain a paste filter cake with a water content of 30%-35%.
The filter cake is dried at 300, cooled, and crushed to obtain the finished product of chromium oxide green.
The washing liquid contains a large number of soluble salts such as potassium sulfate, chromium sulfate, hexavalent chromium, etc.
The hexavalent chromium can be reduced to chromium hydroxide precipitate by introducing hydrogen sulfide and then separated out by filtration. Hydrochloric acid is added to the filtrate, and the solution is concentrated and crystallized to produce potassium chloride as a by-product. Sulfur dioxide and sulfur trioxide gas released during roasting can be absorbed by dilute ammonia water, and ammonium sulfate can be produced as a by-product.
2.Thermal decomposition method: 99. 5% chromic anhydride was calcined at about 1400 for 1 ~ 1.5h to produce chromium oxide. After cooling, grinding with a high-speed pulverizer to obtain the finished product of chromium oxide green.
3. Thermal chromium hydroxide decomposition method: sodium sulfide solution is added into the hot solution of sodium chromate to react to generate chromium hydroxide. After filtration, the obtained chromium hydroxide filter cake is washed and centrifugally dehydrated and then baked at about 1400 to generate chromium trioxide. The furnace charge is washed, dried, and crushed to obtain chromium oxide products. Sodium bicarbonate and sodium thiosulfate can be recovered from the alkali liquor obtained by separating chromium hydroxide, which is carbonized by carbon dioxide. The chromium trioxide prepared by this method is dark in color, so it is not suitable to be used as a pigment. It is mainly used for smelting metallic chromium and making a polishing paste.
Applications of chromium oxide powder
Mainly used for smelting metal chromium and chromium carbide. Used as a glaze for enamels and ceramics. Colorants for artificial leather, building materials, etc. Special ink for manufacturing sun-resistant coatings, abrasive materials, green polishing paste, and printing banknotes. Used as a catalyst for organic synthesis. It's advanced green.
Price of chromium oxide powder
Chromium oxide particle size and purity will affect the product's price, and the purchase volume can also affect the cost of chromium oxide. A large amount of large amount will be lower. The price of chromium oxide can be found on our company's official website.
Chromium oxide powder supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including chromium oxide, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective chromium oxide, you are welcome to contact us or inquire at any time.

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