Physical and chemical properties
colorless cubic crystal, deliquescent, specific gravity 2.48, melting point 858℃, soluble in water, soluble in hydrofluoric acid, and liquid ammonia.
Applications of Potassium Fluoroaluminate (K3AlF6)
Potassium fluoroaluminate (K3AlF6) is widely used in aluminum processing and related industries, particularly in operations requiring consistent composition, stable performance, and scalable supply.
1. Aluminum Refining and Flux Applications
K3AlF6 is used as a flux component in aluminum refining to improve melt fluidity and support impurity removal. It is especially valued in industrial environments where process stability and repeatability are critical.
2. Aluminum Alloy Production
In alloy production, potassium fluoroaluminate helps maintain stable melt chemistry and supports consistent production quality across batches, making it suitable for continuous operations.
3. Welding and Brazing Flux
K3AlF6 is applied in flux formulations for aluminum welding and brazing, contributing to oxide removal and improved bonding performance.
4. Industrial Fluoride Systems
It is used in selected fluoride systems where controlled specifications and long-term supply reliability are required.
Specification
| Product Name | KF | Test Standard | ||
| Test Item | Unit | Grade I | Grade II | Grade III |
| KF | % | ≥99.5% | ≥99% | ≥98.5% |
| Cl– | % | ≤0.05 | ≤0.1 | ≤0.5 |
| Substance Insoluble in Water | % | ≤0.05 | ≤0.05 | ≤0.05 |
| Free acid As KOH | % | ≤0.05 | ≤0.1 | ≤0.1 |
| SiO2 | % | ≤0.01 | ≤0.05 | ≤0.1 |
| Substance Insolublein Water | % | ≤0.01 | ≤0.1 | ≤0.1 |
| SO42- | % | ≤0.1 | ≤0.2 | ≤0.2 |
| Loss on drying | % | ≤0.2 | ≤0.2 | |
| Na | ppm | ≤300 | ≤500 | |
| Al | ppm | ≤10 | ≤10 | |
| Pb | ppm | ≤10 | ≤10 | |
| Fe | ppm | ≤10 | ≤20 | |
| Mg | ppm | ≤5 | ≤5 | |
| As | ppm | ≤5 | ≤5 | |
| Ca | ppm | ≤5 | ≤10 | |
| Cr | ppm | ≤5 | ≤5 | |
| Ni | ppm | ≤3 | ≤5 | |
| Cu | ppm | ≤5 | ≤5 | |
| Clarity Trial | PASS | PASS | PASS | |
Packing
net weight 25kg, paper plastic composite bag, plastic woven bag, cardboard bucket.
