By Ada | 13 February 2023 | 0 Comments
What's so unique about Chromium oxide?
What is Chromium oxide?
Chromium oxide is a dark green crystal powder with a metallic luster that belongs to the hexagonal or tripartite crystal system, and α -alumina is the same crystal type. Chemical formula Cr2O3, molecular weight 151.99, relative density 5.21 (21℃), Mohs hardness of 9, harder than quartz, steel, melting point 2266 ± 25℃, boiling point above 3000℃, chemical properties are extremely stable. Magnetic, insoluble in water and ethanol, both acid resistance and alkali resistance. Even in the red-hot state, the hydrogen is hardly reduced. In addition, it is difficult to react with sulfur and hydrogen sulfide. The chromium oxide green burned at high temperature is inert to acid and base, but it can be completed with acid flux and converted into soluble chromium salt. Together with bromine alkali metal salt solution heating reaction and dissolve, can dissolve in hot potassium bromate solution.
Main uses of Chromium oxide
Chromium oxide can be used as a green pigment in printing ink and paint and as a colorant in glass, ceramic tiles, ceramic vessels, and other aspects. Have a wide range of uses and can also use hard properties such as green oil and other oil-grinding materials in chrome plating and nickel plating, grinding bottom plate, and surface polishing. Chromium oxide can also be made into chromium magnesium or magnesium chrome refractory brick use and can be used as metal chromium raw material. The most commonly used green pigment in enamel production is chromium oxide, its color can be from bright green to dark green, with excellent light resistance, heat resistance, chemical corrosion resistance, and other properties, and high covering force, but the color is dark. It can be applied separately to make the bean green colored glaze with 3% to 5%; or with aluminum, zinc, and calcium at high temperatures.
Preparation of Chromium oxide:
Cr2O3 Is the main raw material for the production of metallic chromium. Chemical metallurgy method for making Cr2O3 from chromite. First, the chromite is oxidized to obtain sodium chromate (Na2CrO4) dissolved in water, oxidizing the 3 valent chromium to 6 valent chromium. After water immersion to obtain sodium chromate solution, sodium chromate solution can be adopted the sodium dichromate method and chromium hydroxide method. Cof medium trioxide by reducing sodium dichromate with ammonium chloride. Sodium dichromate and ammonium chloride are mixed according to the calculated ingredient ratio (practice has proved that when the amount of ammonium chloride is about 140% of the theoretical amount, the conversion rate can reach 95-96%), and then reduced in the flame reflection furnace, the chemical reaction formula: Na2Cr2O7 + 2NH4Cl=Cr2O3 + 2 + 2NaCl + N2 + 4H2O, the furnace into the washing tank with mixer and washed with hot water several times to remove sodium chloride. Then use the filter press filter, and get 30-35% moisture paste chromium oxide filter cake after drying (temperature 300℃) through high-temperature calcination, cooling, and crushing, that is, the finished product. The finished product contains Cr2O3 (97% -98%). In addition to producing Cr2O3 by reducing NH4Cl, Cr2O3 can also be produced by reducing Na2Cr2O7 with sulfur and charcoal.
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.
Chromium oxide is a dark green crystal powder with a metallic luster that belongs to the hexagonal or tripartite crystal system, and α -alumina is the same crystal type. Chemical formula Cr2O3, molecular weight 151.99, relative density 5.21 (21℃), Mohs hardness of 9, harder than quartz, steel, melting point 2266 ± 25℃, boiling point above 3000℃, chemical properties are extremely stable. Magnetic, insoluble in water and ethanol, both acid resistance and alkali resistance. Even in the red-hot state, the hydrogen is hardly reduced. In addition, it is difficult to react with sulfur and hydrogen sulfide. The chromium oxide green burned at high temperature is inert to acid and base, but it can be completed with acid flux and converted into soluble chromium salt. Together with bromine alkali metal salt solution heating reaction and dissolve, can dissolve in hot potassium bromate solution.
Chromium oxide can be used as a green pigment in printing ink and paint and as a colorant in glass, ceramic tiles, ceramic vessels, and other aspects. Have a wide range of uses and can also use hard properties such as green oil and other oil-grinding materials in chrome plating and nickel plating, grinding bottom plate, and surface polishing. Chromium oxide can also be made into chromium magnesium or magnesium chrome refractory brick use and can be used as metal chromium raw material. The most commonly used green pigment in enamel production is chromium oxide, its color can be from bright green to dark green, with excellent light resistance, heat resistance, chemical corrosion resistance, and other properties, and high covering force, but the color is dark. It can be applied separately to make the bean green colored glaze with 3% to 5%; or with aluminum, zinc, and calcium at high temperatures.
Preparation of Chromium oxide:
Cr2O3 Is the main raw material for the production of metallic chromium. Chemical metallurgy method for making Cr2O3 from chromite. First, the chromite is oxidized to obtain sodium chromate (Na2CrO4) dissolved in water, oxidizing the 3 valent chromium to 6 valent chromium. After water immersion to obtain sodium chromate solution, sodium chromate solution can be adopted the sodium dichromate method and chromium hydroxide method. Cof medium trioxide by reducing sodium dichromate with ammonium chloride. Sodium dichromate and ammonium chloride are mixed according to the calculated ingredient ratio (practice has proved that when the amount of ammonium chloride is about 140% of the theoretical amount, the conversion rate can reach 95-96%), and then reduced in the flame reflection furnace, the chemical reaction formula: Na2Cr2O7 + 2NH4Cl=Cr2O3 + 2 + 2NaCl + N2 + 4H2O, the furnace into the washing tank with mixer and washed with hot water several times to remove sodium chloride. Then use the filter press filter, and get 30-35% moisture paste chromium oxide filter cake after drying (temperature 300℃) through high-temperature calcination, cooling, and crushing, that is, the finished product. The finished product contains Cr2O3 (97% -98%). In addition to producing Cr2O3 by reducing NH4Cl, Cr2O3 can also be produced by reducing Na2Cr2O7 with sulfur and charcoal.
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.
Leave a Reply
Your email address will not be published.Required fields are marked. *