Optimizing Particle Size in Sand Milling Slurries for Titanium Dioxide Production

The production of high-quality titanium dioxide relies on the optimization of sand milling slurries' particle size, which directly impacts the whiteness and water dispersion of the final product. This study investigates the effects of sand milling speed, zirconia bead size, slurry concentration, feed pump speed, and sand mill filling ratio on the particle size of sand milling slurries and their consequences on whiteness and water dispersion. Here are the key findings and recommendations:

1. Sand Milling Speed

• Sand milling speed significantly influences the particle size of sand milling slurries.

• Optimal sand milling speed: 3000 r/min.

2. Zirconia Bead Size

• Zirconia bead size has a notable impact on the particle size of sand milling slurries.

• Optimal zirconia bead size for titanium dioxide sand milling: 0.8 mm.

3. Slurry Concentration

• Slurry concentration should be adjusted to optimize sand milling results.

• Optimal slurry concentration: 500 g/L for titanium dioxide.

4. Feed Pump Speed

• Feed pump speed plays a crucial role in the sand milling process.

• Optimal feed pump speed: 1 r/min.

5. Sand Mill Filling Ratio

• The sand mill filling ratio affects particle size and flowability.

• Optimal sand mill filling ratio: 85%.

Impact on Whiteness

• Whiteness is a crucial indicator of titanium dioxide quality.

• As the D50 of the sand milling slurry increases, whiteness decreases. Smaller particles are preferred for higher whiteness.

Impact on Water Dispersion

• Water dispersion is a key performance indicator for titanium dioxide.

• As the D50 of the sand milling slurry decreases, water dispersion improves significantly. Smaller particles exhibit better dispersion.

In summary, particle size control in sand milling slurries is essential for producing high-quality titanium dioxide. Optimizing conditions through sand milling speed, zirconia bead size, slurry concentration, feed pump speed, and sand mill filling ratio can lead to improved whiteness and water dispersion. These findings can be applied in the industry to enhance the quality of titanium dioxide products.