The criteria for determining the quality of rutile sand include:

1. Titanium Dioxide Content: Rutile sand primarily consists of titanium dioxide (TiO2), and a higher TiO2 content generally indicates better quality as it contributes to greater whiteness and opacity.
2. Particle Size and Distribution: High-quality rutile sand typically has uniform particle sizes and a consistent distribution, which ensures better performance and application in various industries.
3. Impurity Levels: Lower levels of impurities, such as iron, chromium, and other heavy metals, are indicative of higher-quality rutile sand. High impurity levels can negatively affect the final product’s performance and appearance.
4. Color and Appearance: Rutile sand of superior quality tends to have a cleaner and more uniform appearance, with minimal discoloration or impurities visible to the naked eye.
5. Processing Techniques: The methods used in mining, processing, and refining rutile sand can impact its quality. Superior processing techniques result in rutile sand with higher purity and better characteristics.
6. Consistency and Stability: High-quality rutile sand should exhibit consistent properties and stability over time, ensuring reliable performance in various applications.
7. Industry Standards and Certifications: Compliance with industry standards and certifications, such as ISO certifications or specific product quality standards, can provide assurance of the rutile sand’s quality and reliability.

Overall, evaluating rutile sand quality involves considering its chemical composition, physical characteristics, processing methods, and adherence to industry standards.