Iron(III) oxide monohydrate
Iron (III) oxide monohydrate
CAS: 51274-00-1
Molecular Formula: Fe2O3
Iron(III) oxide monohydrate - Names and Identifiers
Iron(III) oxide monohydrate - Physico-chemical Properties
| Molecular Formula | Fe2O3 |
| Molar Mass | 159.69 |
| Density | 5.24 |
| Melting Point | 1538 °C |
| Flash Point | >230°F |
| Water Solubility | 1.65μg/L |
| Appearance | Powder |
| Color | yellow |
| Storage Condition | Room Temperature |
| Physical and Chemical Properties | The character is powder from yellow to brown in lemon. melting point 350~400 ℃ relative density 2.44~3.60 solubility: insoluble in water and alcohol, soluble in acid. lemon yellow to brown powder. Fine grain, is the crystal of iron oxide hydrate. Density 4.0g/cm3, has good coloring power, hiding power and light resistance, alkali resistance, acid resistance and heat resistance. Insoluble in water, alcohol, soluble in acid. Due to different production methods and operating conditions, there are great differences in crystal structure and physical properties. When heated above 150oC, the crystal water begins to decompose and turns red. |
| Use | Mainly used in paint, cement parts, building surfaces, plastics, rubber coloring inorganic yellow pigment. It is widely used in the coloring of artificial marble, terrawl and rubber products. It is also used in the manufacture of watercolors, paints, and architectural coatings. Also useful are intermediates for the production of iron oxide-based pigments, such as for the preparation of iron oxide red, iron oxide black. |
Iron(III) oxide monohydrate - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | - |
| RTECS | NO7400000 |
Iron(III) oxide monohydrate - Upstream Downstream Industry
| Raw Materials | Sulfuric acid Ferrous sulfate Sodium hydroxide Iron Nitric acid |
| Downstream Products | C.I. Pigment Black 11 |
Iron(III) oxide monohydrate - Nature
Open Data Verified Data
powder from yellow to brown in lemon. The relative density ranged from 2. 44 to 3.60. The melting point was 350-400 °c. Insoluble in water, alcohol, soluble in acid. Fine particles, is the crystal of iron oxide hydrate. Due to the different production methods and operating conditions, the degree of hydration is different, and the crystal structure and physical properties are very different. Coloring power, hiding power, light resistance, acid resistance, alkali resistance, heat resistance are good. Above 150 deg C decomposition of crystal water, into red.
Last Update：2024-01-02 23:10:35
Iron(III) oxide monohydrate - Preparation Method
Open Data Verified Data
ferrous sulfate oxidation method; Sulfuric acid reacts with iron filings to generate ferrous sulfate, 3% sodium hydroxide solution is added and air is introduced to prepare each crystal nucleus, ferrous sulfate and iron filings are added to the crystal nucleus suspension, heated and oxidized, and filtered by pressure filter, yellow iron oxide was obtained by washing and pulverization.
Last Update：2022-01-01 11:05:51
Iron(III) oxide monohydrate - Use
Open Data Verified Data
is widely used in the construction of artificial marble, Grindstone coloring. Is the color, oil, paint, rubber and other pigments. Used as an intermediate of iron oxide pigment, such as iron oxide red, iron black and so on.
Last Update：2022-01-01 11:05:50
Iron(III) oxide monohydrate - Safety
Open Data Verified Data
packed in woven or multi-layer Kraft paper bags lined with polyethylene plastic bags, each with a net weight of 25kg. Store in a ventilated, dry warehouse. Packaging should be sealed and moisture-proof. Avoid high temperature, and acid, alkali Isolation storage. According to the above storage conditions, the effective storage period of the product is 3 years without unpacking. Toxicity and protection: see red iron oxide.
Last Update：2022-01-01 11:05:51
Iron(III) oxide monohydrate - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | the main component of iron oxide yellow is iron oxide, chemical formula Fe2O3 · H2O, which is monohydrate of iron oxide. The biggest application of iron oxide is as a pigment. According to the color, it is divided into iron oxide red, iron oxide yellow, and iron oxide black. Iron oxide brown is a mixture of iron oxide red and iron oxide black (and iron oxide yellow). |
| preparation | 74g of iron filings are added to 1000ml of 15% sulfuric acid to react until the iron filings disappear to generate ferrous sulfate with a concentration of about 200g/L. Add enough 30% sodium hydroxide to the ferrous sulfate solution prepared above, continuously stir to convert the iron in the total 40% into ferrous hydroxide [Fe(OH)2], and pass air at 30~35 ℃ to oxidize Fe to Fe to form a crystal nucleus. Then 90g/L of iron filings are added to the treatment to generate 7g/L crystal nuclei and 40g/L of ferrous sulfate, continue to heat to 85 ℃, and oxidize with air at a speed of 600L/h for 64h, then filter, wash, dry and pulverize to obtain aqueous iron oxide yellow. |
| toxicity | ADI 0~0.5mg/k(FAO/WHO,2001). Germany is not allowed. See Iron Oxide Red. |
| use limit | is limited to non-direct food, and the dosage is not limited (FDA, 186.1330, 186.1374,2000); Casing (0.10% of finished product quantity) and cat and dog food, 0.25% (FDA, 73.200,2000) |
| use | sulfuric acid is reacted with iron filings to generate ferrous sulfate, then concentrated sulfuric acid and sodium chlorate are added for ferrous oxidation, the generated ferric sulfate is neutralized and precipitated with sodium hydroxide, then ferrous sulfate and iron sheet are added for conversion, and transparent iron oxide yellow is prepared by washing, surface treatment, washing, filtration, drying and crushing. Its reaction formula is as follows: Fe H2SO4 → FeSO4 H2 ↑ 6FeSO4 NaCIO3 3H2SO4 → 3 Fe2(SO4)3 NaC1 3 H2OFe2(SO4)3 6NaOH → 2Fe(OH)3 3 Na2SO43Fe(OH)3 → Fe2O3?H2O 2H2O edible yellow pigment. iron oxide yellow is an inorganic yellow pigment, which is mainly used for coloring coatings, cement parts, building surfaces, plastics and rubber. Iron oxide yellow is widely used in the coloring of artificial marble and terrazzo in the construction industry. It is a pigment of watercolor, oil color, paint, rubber, etc. It can also be used as an intermediate of iron oxide pigments, such as iron oxide red, iron black, etc. |
| production method | sulfuric acid is reacted with iron filings to generate ferrous sulfate, then concentrated sulfuric acid and sodium chlorate are added for ferrous oxidation, the generated ferric sulfate is neutralized and precipitated with sodium hydroxide, then ferrous sulfate and iron sheet are added for conversion, and transparent iron oxide yellow is prepared by washing, surface treatment, washing, filtration, drying and crushing. The reaction formula is as follows: Fe + H2SO4 → FeSO4 + H2 ↑ 6FeSO4 + NaCIO3 +3H2SO4 → 3Fe2(SO4)3 + NaC1 +3H2OFe2(SO4)3 + 6NaOH → 2Fe(OH)3+3 Na2SO43Fe(OH)2 → Fe2O3?H2O + 2H2O method 1: ferrous sulfate oxidation method sulfuric acid reacts with iron filings to generate ferrous sulfate, sodium hydroxide is added and air is introduced for oxidation to prepare crystal nuclei, then ferrous sulfate and iron filings are added to the crystal nuclei suspension, and air is heated for oxidation, and yellow iron oxide is prepared by filtration, rinsing, drying and crushing. Its Fe + H2SO4 → FeSO4 + H2 ↑ FeSO4 + 2NaOH → Fe(OH)2 + Na2SO4 4Fe(OH)2 + O2 → 4FeOOH + 2H2O H2SO4 + Fe + 7H2O → FeSO4 · 7H2O + H2 ↑ FeSO4 · 7H2O + O2 → 2 Fe2O3 · H2O ↓ +4H2SO4 + 2H2O Reaction conditions: 74g of iron filings are added to 1000ml of 15% sulfuric acid to react until the iron filings disappear, ferrous sulfate with a concentration of about 200g/L is generated. Add enough 30% sodium hydroxide to the ferrous sulfate solution prepared above, continuously stir to convert the iron in the total 40% into ferrous hydroxide [Fe(OH)2], and pass air at 30~35 ℃ to oxidize Fe2 to Fe3 to form a crystal nucleus. Then 90g/L of iron filings are added to the treatment to generate 7g/L crystal nuclei and 40g/L of ferrous sulfate, continue to heat to 85 ℃, and oxidize with air at a speed of 600L/h for 64h, then filter, wash, dry and pulverize to obtain aqueous iron oxide yellow. Method 2: Aromatic amino compounds can be produced simultaneously by aromatic nitro oxidation. The reaction equation is as follows: Fe + H2O + R-NO2 → Fe2O3 · H2O + R-NH2 reaction conditions are as follows: 560 parts of water, 36.5 parts of 32% hydrochloric acid, 160 parts of iron powder and 10 parts of aluminum powder are added into the reaction kettle. 1460 parts of aqueous solution containing 253 parts of 5-nitronaphthalene sulfonic acid and 8-nitronaphthalene sulfonic acid were added to the reaction kettle for 16~24h. The pH value of the aqueous solution of naphthalene sulfonic acid was 6 and the temperature was 80~85 ℃. The temperature in the reaction kettle is 95~100 ℃, and the pH value is 6~6.5. Under these conditions, react for 2 hours, add 8 parts of 25% ammonia water, further react for 4 hours, filter, wash the filter cake with 560 parts of water three times, mix the washed filter cake with 1000 parts of water, heat at 95~100 ℃, add 45 parts of 32% hydrochloric acid, stir for 2 hours, filter, and wash the filter cake with water until acid-free, 160 parts of iron oxide yellow pigment and naphthalene sulfonic acid were obtained by drying with 96% yield. |
Last Update：2024-04-09 21:04:16
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Raw Materials for Iron(III) oxide monohydrate
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