Hydrofluoric Acid 55%

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Hydrofluoric acid is one of the key pH modifiers used in flotation. It is used as an activator and depressant mostly in the flotation of industrial minerals eg. Tantalite, feldspar and silica

HF is widely used globally in the flotation of feldspar from quartz. It is used as an pH modifier to activate the feldspar whilst suppressing quartz. In this process, long chain amines are usually used as collector.

However, more often iron is normally found together with the feldspar. The iron and feldspar are then subjected to secondary flotation, also in HF but this time with another smaller chain amine collector.

Plant design should incorporate systems to recycle the water and avoid leakage of fluoride ions into the nearby streams.

Usage Guidelines for  hydrogen fluoride


Hydrogen fluoride

Ores were used

Industrial minerals – tantalite, feldspar, silica, columbite


1-2 in rutile-ilmenite flotation, 2.5 in feldspar-silica flotation

Other additions

Amine based esters as collectors


CAS number






EC number


RTECS number





Molecular formula

HF (aq)

Molar mass

not applicable
(see hydrogen fluoride)


Colorless solution


1.15 g/mL (for 48% soln.)

Melting point

Not applicable
(see hydrogen fluoride)

Boiling point

Not applicable
(see hydrogen fluoride)

Solubility in water


Acidity (pKa)


View FileHydrofluoric Acid SDS    Size: (1.24 MB)

Hydrofluoric Acid ALL GRADES SDS

View FileHydrofluoric Acid 55% COA    Size: (1.25 MB)

Hydrofluoric Acid 55% COA

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    KS Energy (Pty) Ltd

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