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By Ada | 13 February 2023 | 0 Comments

What's so unique about Chromium oxide?

What is Chromium oxide?
Chromium oxide has a metallic luster. Relative density of 5. 21. Melting point of 2,266℃. Boiling point of 4,000℃. Insoluble in water, insoluble in acid, soluble in a hot alkali metal bromine solution. It is extremely stable to light, atmosphere, high temperature and corrosive gases such as sulfur dioxide and hydrogen sulfide. Very high covering force, magnetic, toxic.
Main uses of Chromium oxide
Chromium oxide is mainly used for smelting metal chromium and chromium carbide. Used as an enamel and ceramic glaze. Artificial leather, building materials, etc. Special ink for the manufacture of sun-resistant coatings, grinding materials, green polishing paste, and printing banknotes. Used as a catalyst for organic synthesis. It is a premium green pigment.
Preparation of chromium oxide
Reduction method: 99.5% potassium dichromate and 98% sulfur yellow are mixed with a mass ratio of 7:1 to produce chromium oxide and potassium sulfate. After the reaction, the furnace material is first wet grinding, and then put into the sink with the mixer to wash with hot water, filter out the chromium oxide with the filter press, get the water content is 30%~35% paste filter cake, the filter cake is dried in 300℃, after cooling and crushing, make the chromium oxide green finished product. The washing liquid contains a large amount of potassium sulfate, chromium sulfate and hexavalent chromium, and other soluble salts; hydrogen sulfide can reduce hexavalent chromium hydroxide precipitation, separated by filtration. Hydrochloric acid was added to the filtrate, and the solution was concentrated and crystallized into the byproduct potassium chloride. The sulfur dioxide and sulfur trioxide gas released during roasting can be absorbed by dilute ammonia water to produce ammonium sulfate; Thermal decomposition method: 99.5% chromic anhydride is calcined with 1~1.5h at a temperature of about 1400℃ to generate chromium oxide. After cooling, the chromium oxide green finished product is prepared by grinding with a high-speed grinder. Thermal decomposition of chromium hydroxide method: adding sodium sulfide solution into hot sodium chromate solution to generate chromium hydroxide, after filtration, and roasting at about 1400℃ to produce chromium trioxide after washing, drying, and crushing. Sodium bicarbonate obtained from chromium hydroxide and sodium thiosulfate can be recovered after carbonization by carbon dioxide. This system of chromium oxide color is dark, should not do pigment, and is mainly used for smelting metal chromium and polishing paste.
Price of Chromium oxide
The different price of Chromium oxide purity is also different. The market price of Chromium oxide is in the process of dynamic change. The Chromium oxide price can be found on our company's official website. If you need it, you can ask us at any time. 
Chromium oxide 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 molybdenum Silicide, 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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