Yellow Iron Oxide (CAS 51274-00-1) is a workhorse pigment in the chemical industry, valued for its vibrant color and excellent performance. As a dedicated manufacturer of Yellow Iron Oxide, we delve into the chemistry behind its production and the manufacturing processes that ensure its high quality. Understanding these aspects is crucial for R&D scientists and product developers looking to buy Yellow Iron Oxide.

The Chemical Foundation of Yellow Iron Oxide

Yellow Iron Oxide is a hydrated form of iron (III) oxide, often represented by the chemical formula Fe2O3·H2O, or more accurately as FeO(OH) (iron oxyhydroxide). Its characteristic yellow color arises from its specific crystalline structure and hydration state. Unlike red and black iron oxides, which are anhydrous, the presence of water molecules in its structure contributes to its distinct hue. It is virtually insoluble in water and organic solvents but exhibits slight solubility in acids, dissolving completely in concentrated hydrochloric acid. Its melting point is remarkably high, around 1538 °C, indicating excellent thermal stability.

Key Manufacturing Processes

Several methods are employed for the commercial synthesis of Yellow Iron Oxide, with the precipitation process being a common and effective route. Here’s a general overview:

  • Precipitation Process: This method typically involves the oxidation of ferrous sulfate (FeSO4) or iron filings in an alkaline solution. For instance, ferrous sulfate can be oxidized with air or oxygen in the presence of a base like sodium hydroxide (NaOH) and often a yellow nucleus pigment. This process yields iron oxyhydroxide (FeOOH), which, after washing, drying, and milling, produces the yellow pigment. This process allows for good control over particle size and color consistency, making it a preferred route for many Yellow Iron Oxide suppliers.
  • Laux Process By-product: Historically, Yellow Iron Oxide was also obtained as a by-product from the Laux process, used in the production of aniline. While efficient, the precipitation process offers better control over the pigment's properties.

Quality Control and Properties for Industrial Use

As a leading Yellow Iron Oxide supplier in China, we focus on stringent quality control measures. Key parameters we monitor include:

  • Appearance: Consistently a fine yellow powder.
  • Fe2O3 Content: Typically above 86% for high-grade pigments.
  • pH: Maintaining a slightly alkaline to neutral pH (3-7) for compatibility.
  • Oil Absorption: Controlled within a specified range for ease of formulation.
  • Residue on Mesh: Minimizing coarse particles for smooth application.

These properties ensure that the Yellow Iron Oxide we supply meets the demanding requirements of industries such as coatings, inks, and construction materials. When you choose to buy Yellow Iron Oxide from us, you are investing in a product with a well-understood and precisely controlled manufacturing process.

For companies looking to source high-quality Yellow Iron Oxide, understanding its chemical basis and manufacturing methods is crucial. Contact us to learn more about our production capabilities and how we can fulfill your needs for this essential pigment. We are ready to provide a quote for Yellow Iron Oxide tailored to your requirements.