Mineral pigment Iron chromite powder VS. chromium oxide green powder
Iron Chromite Powder and Chromium Oxide Green, although both compounds of chromium, can also be used as pigments and coloring agents in ceramic glazes and glass products. However, they have significant differences and variations in chemical composition, physical properties, and application fields. The following is a detailed comparison of differences:
1. Chemical composition
a. Iron Chromite Powder:
-Chemical formula: (Fe, Mg) Cr2O4
-The main component is chromite, a natural mineral containing oxides of chromium, iron, and magnesium.
b.Chromium Oxide Green:
-Chemical formula: Cr2O3
-It is a high-purity chemical synthetic substance, mainly composed of chromium trioxide.
2. Physical properties
a. Iron Chromite Powder:
-Color: Black or Dark Brown
-Hardness: relatively low, with a Mohs hardness of about 5.5
-Density: Approximately 4.4-4.8 g/cm ³
b.Chromium Oxide Green:
-Color: Green
-Hardness: relatively high, with a Mohs hardness of about 8
-Density: Approximately 5.21 g/cm ³
3. Application
a. Iron Chromite Powder:
-Metallurgical industry: used as a raw material for smelting chromium iron alloys.
-Refractory materials: used as additives for refractory bricks and refractory concrete.
-Pigments: Although natural colors tend to be black, finely ground chromite sand can be used to make glass coloring agents, ceramic glazes, and ink pigments, which also have good coloring effects.
b.Chromium Oxide Green:
-Pigments: widely used for coloring materials such as paint, ceramics, glass, plastics, etc.
-Abrasive: Used as a grinding agent, due to its high hardness, it can be used for advanced grinding and polishing.
-Catalyst: Used as a catalyst in certain chemical reactions.
4. Production process
a. Iron Chromite Powder:
-Obtained by crushing and grinding natural chromium ore, the natural ore used for grinding chromium ore powder comes from high-quality mining areas such as South African chromium ore and Zimbabwean chromium ore.
b.Chromium Oxide Green:
-The chemical synthesis method is usually obtained by reducing chromate or oxidizing chromate.
5. Purity and impurities
a. Iron Chromite Powder:
-Chromium ore powder, which contains a certain amount of impurities such as iron and magnesium, should have a purity of over 46% as a pigment.
b.Chromium Oxide Green:
-High purity, usually above 99%, with extremely low impurity content.
6. Price and cost
a. Iron Chromite Powder:
-The price is relatively low because it mainly comes from natural ore.
b.Chromium Oxide Green:
-The price is relatively high because it requires a complex chemical synthesis process.
7. Powder particle size
a. Iron Chromite Powder:
-The regular specifications are 200 mesh, 270 mesh, 325 mesh, and 400 mesh. Our factory can also customize sizes for customers, such as 600 mesh, 800 mesh, 1000 mesh, 1200 mesh, 1500 mesh, 2000 mesh, 2500 mesh. The particle size range is 45um-5um.
b.Chromium Oxide Green:
-The standard specification is 325 mesh, but some manufacturers also produce size such as 5um and 1um.
In summary, Iron chromite powder is a natural mineral mainly used in metallurgy, refractory materials, glass ceramic glazes, etc. Chromium oxide green is a high-purity synthetic substance widely used in the fields of pigments and abrasives. The chemical composition, physical properties, application fields, and production methods of the two are significantly different.
Picture of Iron chromite powder 325#:
Picture of Chromium oxide green powder 325#:
