Kaolin Clay Storage — Hydrous and Calcined Aluminum Silicate Pigment Tank Selection

Storing Kaolin Clay? Start Here

Kaolin clay is a versatile mineral used in various industries, from paint to paper and ceramics. It comes in two forms: hydrous, which retains water, and calcined, which is fired to remove water. Both forms are non-corrosive and non-reactive, making them safe to handle. When storing kaolin, consider whether you're dealing with dry powder or slurry, as this will influence your equipment choices.

Can you store it in a poly tank?

Yes, you can store both dry powder and slurry forms of kaolin clay in polyethylene tanks. High-density polyethylene (HDPE) and cross-linked polyethylene (XLPE) are standard materials for hoppers, silos, and slurry storage tanks. They handle kaolin well without reacting or degrading.

Key Issue: Settling in Slurry Storage

When storing kaolin slurry, one key concern is settling. Over time, the clay particles can settle at the bottom of the tank, leading to uneven consistency. Regular agitation or circulation systems can help maintain a uniform slurry mixture.

The safety that actually matters

• Use appropriate gaskets and seals: EPDM is standard, but Buna-N and Viton are also acceptable.
• Ensure tanks are equipped with proper agitation to prevent settling.
• Wear protective gear to avoid inhaling dust when handling dry kaolin powder.

Common questions

What is the best material for storing kaolin slurry?

HDPE or XLPE tanks are ideal for storing kaolin slurry due to their durability and chemical compatibility.

How do I prevent kaolin slurry from settling?

Use agitation or circulation systems to keep the slurry mixed and prevent settling.

Is kaolin clay hazardous to handle?

Kaolin is generally safe, but it's important to avoid inhaling dust and to follow proper handling procedures.