Sodium Silicate (Mining Dispersant) Storage — Na2O.xSiO2 Tank for Flotation Gangue Depression

Storing Sodium Silicate? Start Here

Sodium silicate, often known as "water glass," is a key player in the mining industry, especially in flotation processes. It helps separate valuable minerals from unwanted gangue minerals like quartz and clay. This solution is highly alkaline and can be corrosive to skin and eyes, but it doesn't produce toxic fumes. When storing sodium silicate, it's crucial to choose the right materials to prevent issues like silica scale buildup and ensure safety.

Can you store it in a poly tank?

Yes, you can store sodium silicate in a polyethylene (poly) tank. Opaque HDPE or XLPE tanks are standard for this purpose. These materials handle the high alkalinity well, but it's important to avoid using aluminum or galvanized steel, as they can dissolve in the caustic solution.

Watch Out for Silica Scale

One key issue with sodium silicate is its tendency to absorb CO₂ from the air, which can lead to the formation of silica scale on exposed surfaces. Over time, this can cause maintenance challenges, so regular inspection and cleaning are important.

The safety that actually matters

• Use appropriate personal protective equipment (PPE) to prevent skin and eye contact.
• Ensure proper ventilation to avoid CO₂ buildup and silica scale formation.
• Regularly inspect tanks and fittings for signs of wear or damage.

Common questions

What type of gaskets should I use?

EPDM gaskets are preferred for sodium silicate solutions.

Can I use stainless steel for storage?

Yes, 316L stainless steel is acceptable for high-temperature service.

Is sodium silicate hazardous to transport?

No, typical commercial-grade solutions are non-regulated for transport.