Wet‑process stirred mill for nano‑ultrafine grinding of kaolin

Release time:

2026-08-13 09:16

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In the fine processing of kaolin, attention is often focused on the content of particles smaller than 2 μm. Consequently, when advancing from ordinary fine powders to ultrafine particle sizes, wet‑process stirred mills offer more precise control over the grinding conditions than simply extending residence times in conventional mills. Although kaolin has relatively low hardness, as particle size decreases and specific surface area increases, slurry viscosity undergoes significant changes— a factor that is frequently overlooked in the design of ultrafine grinding processes. Excessively high solids content hinders slurry circulation, while excessively low solids content reduces the processing capacity per unit volume.

The actual process needs to be tailored to the feed particle size and the target. Select ceramic ball specifications based on 2‑micron content, slurry rheology, and production yield. The cell mill employs a vertical wet‑grinding configuration, enabling increased particle‑to‑particle contact through the use of small‑diameter grinding media in multiple size fractions, while a recirculation system is used to control grinding time. For kaolin projects, it is insufficient to rely solely on particle‑size analysis; one must also evaluate changes in whiteness, slurry stability, product yield, and specific energy consumption per ton of product, to prevent over‑grinding driven by the pursuit of ultrafine fineness.

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