What is chromium oxide? The scientific name of chromium oxide green is chromium trioxide, also known as "chromium oxide." It is a dark green crystalline powder with a metallic luster belonging to the hexagonal or triangular crystal system, and α- Alumina is the same crystal form, with chemical formula Cr2O3, molecular weight 151.99, and relative density of 5.21. It is harder than quartz and steel, has a melting point of 1990 ℃, a boiling point above 3000 ℃, and its chemical properties are extremely stable. It is magnetic and insoluble in water and alcohol. Chromium oxide green, which has been burned at high temperature, is inert to acid and alkali but can be confused with acid flux and converted into soluble chromium (III) salt. It is soluble in a hot alkali metal bromate solution. Chromium oxide green is a common green pigment; Its color can change from bright green to dark green. It has excellent light resistance, heat resistance, chemical corrosion resistance, and other properties. It has high hiding power, but its color is dark.
Preparation of chromium oxide Reduction method: Mix 99.5% potassium dichromate and 98% sulfur at the mass ratio of 7:1 and then calcine to produce chromium oxide and potassium sulfate. The reaction furnace charge is first wet ground and then put into a stirring tank to wash with hot water. A filter press filters out the chromium oxide to obtain a paste filter cake with a water content of 30% - 35%. Dry the filter cake at 300 ℃, cool it, and crush it to produce a chromium oxide green product. The washing solution contains a large amount of potassium sulfate. Soluble salts such as chromium sulfate and hexavalent chromium can be reduced by adding hydrogen sulfide to form a chromium hydroxide precipitate, filtered out. Hydrochloric acid is added to the filtrate, and the solution is concentrated and crystallized to produce potassium chloride. The sulfur dioxide and sulfur trioxide gas released during roasting can be absorbed by diluting ammonia water to produce ammonium sulfate.
Use of chromium oxide It is mainly used for smelting metallic chromium and chromium carbide. It is used as a glazing agent for enamel and ceramics. It is a colorant for artificial leather, building materials, etc. It is used for manufacturing light-resistant coatings, abrasive materials, green polishing paste, and special ink for printing banknotes. It is used as a catalyst for organic synthesis. It is a high-grade green pigment.
Price of chromium oxide 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 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 inquireat any time.
