Iron oxide: wet method: Quickly react with a certain amount of 5% ferrous sulfate solution with an excess sodium hydroxide solution (requiring an excess of 0.04-0.08g/ml of alkali). A colloidal solution of iron hydroxide, introduced into the air at room temperature to turn it all reddish brown, serves as the crystal nucleus for depositing iron oxide. The crystal nucleus is used as the carrier, and ferrous sulfate is used as the medium. Air is introduced, and ferrous sulfate reacts with oxygen in the air to form iron oxide (i.e. iron red) in the presence of metallic iron at 75-85 ℃ The sulfate ions deposited on the crystal nucleus in the solution react with metal iron to regenerate ferrous sulfate. Ferrous sulfate is then oxidized to iron red by air and continues to deposit. This cycle continues until the end of the entire process, generating red iron oxide. Dry method: Nitric acid reacts with iron filings to produce ferrous nitrate, which is cooled, crystallized, dehydrated, and dried. After grinding, it is calcined at 600-700 ℃ for 8-10 hours. After being crushed in the water washing and drying process, the iron oxide red product can be obtained. Iron oxide yellow can also be used as the raw material and then calcined at 600-700 ℃ to obtain iron oxide red. 4Fe is used to produce NO3 → 2Fe2O3+12NO2 ↑+3O2 ↑ Fe2O3 → nH2O → Fe2O3+nH2O 8. Prepare transparent iron oxide yellow first (see transparent iron oxide yellow for the preparation method). Transparent iron oxide red was prepared by calcination and dehydration, and its two α– FeOOH==△==2 α– FeSO3+H2O. If you are looking for high quality, high purity and cost-effective Iron Oxide, or if you require the latest price of Iron Oxide, please feel free to email contact mis-asia.