Fluorspar impurities and how they affect performance

Why this matters

Impurities are what separate a theoretical purchase from a usable shipment. The same CaF2 number can behave differently if silica, calcium carbonate, sulphur, or phosphorus are out of range.

The buyer question is not just how much useful mineral is present. It is whether the impurity mix will interfere with the plant process or the melt behavior.

Buyer checklist

If you are using this article for RFQ prep, these are the details that should be explicit before a supplier quote is meaningful.

• Identify the impurity limits that truly affect your process.
• Ask whether the supplier publishes low-sulphur or low-phosphorus options.
• Compare like with like when you evaluate competing offers.

Common mistakes

These mistakes slow down procurement or create quality surprises after the cargo lands.

• Assuming impurities are interchangeable across all buyers.
• Treating the COA as optional once the CaF2 target is met.
• Ignoring process-specific sensitivity to silica and carbonate levels.

Practical takeaway

The real job of a specification is to keep the right impurities out of the wrong plant.