Chromite sand can be used as a coloring agent for wine bottles. Here’s how it works:
- Coloration principle: Chromite sand contains chromium oxide (Cr2O3)). During the glass – making process, the chromium element in chromite sand reacts with other components in the glass at high temperatures, causing the glass to exhibit specific colors3. Usually, it can make the glass take on green, olive, dark brown, and other colors. These colors can enhance the UV resistance of wine bottles, protect the wine from sunlight, and prolong the shelf life of the wine.
- Advantages of chromite sand as a coloring agent:
- High temperature stability: Chromite sand has a high refractoriness and good high – temperature stability. It performs well at 1800℃ and does not affect the firing of glass products.
- Good chemical stability: It has good heat – shock resistance and is corrosion – resistant to glass and slag. It does not easily react with other substances in the glass – making process, ensuring the stability of the glass color.
- Uniform particle size: The particle size of chromite sand can be strictly controlled to be uniform and fine. For example, 98% of the 325 – mesh chrome flour particles are smaller than 45um, which can be evenly distributed in the glass to avoid black stains and ensure the uniformity of the glass color.
- Application : In the production of wine bottles, chromite flour of different finenesses, such as 200 – mesh and 325 – mesh, is often used. For example, 46% chromite flour 200 – mesh is added during the manufacturing of champagne glass containers to obtain colors like champagne and dark brown, which not only improve the packaging image and quality but also have a practical effect on the preservation of wine.
