CAS number：51274-00-1
molecular formula：Fe2O3
molecular weight：159.69
EINECS number：257-098-5

English synonyms

C.I.Pigmentyellow42;Transparentironoxideyellow;RAW UMBER;ROUGE;SIENNA BURNT;SIENNA;NR RED IRON OXIDE;YELLOW FERRIC OXIDE

Related categories

Organic and inorganic chemicals; coatings and paints; inorganic pigments; additives; chemical products-organic solvents; additives; pigments and dyes; biochemical reagents; rare earth; daily cosmetics; INORGANIC & ORGANIC CHEMICALS; UVCBs-inorganic; Ct oxides; Inorganic chemical products; inorganic salts; pigments; food additives; food pigments (colorants); food pigments and color retention agents; metal oxide; dyestuff; other raw materials; chemical products; raw materials; chemical raw materials; chemical materials; inorganic chemical raw materials

Introduction

The main component of iron oxide yellow is iron oxide, with the chemical formula Fe2O3·H2O, which is a 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, iron oxide black, and iron oxide brown is a mixture of iron oxide red, iron oxide black (and iron oxide yellow).

It is a powdery yellow transparent pigment. The relative density is 3.5. Chemically stable. The particle size is 0.01 to 0.02 μm. It has a large specific surface area (about 10 times that of ordinary iron oxide), and has good properties such as strong ultraviolet absorption, light resistance, and atmospheric resistance. The paint film made is transparent and has excellent properties.

●  React sulfuric acid and iron filings to form ferrous sulfate, then add concentrated sulfuric acid and sodium chlorate for ferrous oxidation, neutralize and precipitate the generated ferric sulfate with sodium hydroxide, then add ferrous sulfate and iron sheet for conversion, wash with water, Surface treatment, washing with water, filtration drying and crushing to obtain transparent iron oxide yellow. Its reaction formula is as follows:
Fe+H2SO4→FeSO4+H2↑
6FeSO4+NaCIO3+3H2SO4→3Fe2(SO4)3+NaC1+3H2O
Fe2(SO4)3+6NaOH→2Fe(OH)3+3Na2SO4
3Fe(OH)3→Fe2O3?H2O+2H2O

●  Eat yellow pigment.

●  Iron oxide yellow is an inorganic yellow pigment, mainly used for the coloring of 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 for watercolor, oil paint, paint, rubber, etc.

●  React sulfuric acid and iron filings to form ferrous sulfate, then add concentrated sulfuric acid and sodium chlorate for ferrous oxidation, neutralize and precipitate the generated ferric sulfate with sodium hydroxide, then add ferrous sulfate and iron sheet for conversion, wash with water, Surface treatment, washing with water, filtration drying and crushing to obtain transparent iron oxide yellow. Its reaction formula is as follows:
Fe+H2SO4→FeSO4+H2↑
6FeSO4+NaCIO3+3H2SO4→3Fe2(SO4)3+NaC1+3H2O
Fe2(SO4)3+6NaOH→2Fe(OH)3+3Na2SO4
3Fe(OH)2→Fe2O3?H2O+2H2O

●  Method 1: Ferrous Sulfate Oxidation Method Sulfuric acid reacts with iron filings to form ferrous sulfate, sodium hydroxide is added and air is oxidized to prepare crystal nuclei, then ferrous sulfate and iron filings are added to the crystal nucleus suspension, heated and blown into the air Oxidation, pressure filtration, rinsing, drying and pulverization to obtain iron oxide yellow. That
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→2Fe2O3·H2O↓+4H2SO4+2H2O Reaction conditions: Add 74g of iron filings to 1000ml of 15% sulfuric acid and react until the iron filings disappear, producing ferrous sulfate with a concentration of about 200g/L. Add enough 30% sodium hydroxide to the ferrous sulfate solution prepared above, and keep stirring to convert 40% of the iron into ferrous hydroxide [Fe(OH)2]. , so that Fe2+ is oxidized to Fe3+ to form a crystal nucleus. Then add 90g/L of iron filings to it to generate 7g/L of nuclei and 40g/L of ferrous sulfate, continue to heat to 85°C, air-oxidize at a speed of 600L/h for 64h, then filter and wash , drying and pulverizing to obtain hydrated iron oxide yellow.
Method 2: Aromatic nitro compound oxidation method Aromatic amino compounds can be produced at the same time. Its reaction equation is as follows:
Fe+H2O+R-NO2→Fe2O3·H2O+R-NH2
The 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 to the reaction kettle. Add 1460 parts of an aqueous solution containing 253 parts of 5-nitronaphthalenesulfonic acid and 8-nitronaphthalenesulfonic acid to the reaction kettle for 16-24 hours, the pH of the aqueous solution of naphthalenesulfonic acid is 6, and the temperature is 80-85°C. The temperature in the reaction kettle is 95～100℃, and the pH value is 6～6.5. Under this condition, react for 2 hours, add 8 parts of 25% ammonia water, further react for 4 hours, filter, and wash the filter cake with 560 parts of water three times. The cake is mixed with 1000 parts of water, heated at 95-100 ℃, added with 45 parts of 32% hydrochloric acid, stirred for 2 hours, filtered, washed with water until acid-free, dried to obtain 160 parts of iron oxide yellow pigment, and aminonaphthalenesulfonic acid can be obtained at the same time , the yield is 96%.

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